Euclid Early Release Observations -- Globular clusters in the Fornax galaxy cluster, from dwarf galaxies to the intracluster field

Euclid Collaboration; T. Saifollahi; K. Voggel; A. Lançon; Michele Cantiello; M. A. Raj; J. -C. Cuillandre; S. S. Larsen; F. R. Marleau; A. Venhola; M. Schirmer; D. Carollo; P. -A. Duc; A. M. N. Ferguson; L. K. Hunt; M. Kümmel; R. Laureijs; O. Marchal; A. A. Nucita; R. F. Peletier; M. Poulain; M. Rejkuba; R. Sánchez-Janssen; M. Urbano; null Abdurro'uf; B. Altieri; M. Baes; M. Bolzonella; C. J. Conselice; P. Cote; P. Dimauro; A. H. Gonzalez; R. Habas; P. Hudelot; M. Kluge; P. Lonare; D. Massari; E. Romelli; R. Scaramella; E. Sola; C. Stone; C. Tortora; S. E. van Mierlo; J. H. Knapen; J. Martín-Fleitas; A. Mora; J. Román; N. Aghanim; A. Amara; S. Andreon; N. Auricchio; M. Baldi; A. Balestra; S. Bardelli; A. Basset; R. Bender; D. Bonino; E. Branchini; M. Brescia; J. Brinchmann; S. Camera; V. Capobianco; C. Carbone; J. Carretero; S. Casas; M. Castellano; S. Cavuoti; A. Cimatti; G. Congedo; L. Conversi; Y. Copin; F. Courbin; H. M. Courtois; M. Cropper; A. Da Silva; H. Degaudenzi; A. M. Di Giorgio; J. Dinis; F. Dubath; X. Dupac; S. Dusini; M. Fabricius; M. Farina; S. Farrens; S. Ferriol; P. Fosalba; M. Frailis; E. Franceschi; M. Fumana; S. Galeotta; B. Garilli; W. Gillard; B. Gillis; C. Giocoli; P. Gómez-Alvarez; B. R. Granett; A. Grazian; F. Grupp; L. Guzzo; S. V. H. Haugan; J. Hoar; H. Hoekstra; W. Holmes; I. Hook; F. Hormuth; A. Hornstrup; K. Jahnke; M. Jhabvala; E. Keihänen; S. Kermiche; A. Kiessling; T. Kitching; R. Kohley; B. Kubik; K. Kuijken; M. Kunz; H. Kurki-Suonio; O. Lahav; D. Le Mignant; S. Ligori; P. B. Lilje; V. Lindholm; I. Lloro; D. Maino; E. Maiorano; O. Mansutti; O. Marggraf; K. Markovic; N. Martinet; F. Marulli; R. Massey; S. Maurogordato; H. J. McCracken; E. Medinaceli; S. Mei; M. Melchior; Y. Mellier; M. Meneghetti; G. Meylan; M. Moresco; L. Moscardini; E. Munari; R. Nakajima; R. C. Nichol; S. -M. Niemi; C. Padilla; S. Paltani; F. Pasian; K. Pedersen; W. J. Percival; V. Pettorino; S. Pires; G. Polenta; M. Poncet; L. A. Popa; L. Pozzetti; G. D. Racca; F. Raison; R. Rebolo; A. Refregier; A. Renzi; J. Rhodes; G. Riccio; M. Roncarelli; E. Rossetti; R. Saglia; D. Sapone; B. Sartoris; P. Schneider; T. Schrabback; A. Secroun; G. Seidel; S. Serrano; C. Sirignano; G. Sirri; L. Stanco; P. Tallada-Crespí; A. N. Taylor; H. I. Teplitz; I. Tereno; R. Toledo-Moreo; F. Torradeflot; A. Tsyganov; I. Tutusaus; E. A. Valentijn; L. Valenziano; T. Vassallo; G. Verdoes Kleijn; A. Veropalumbo; Y. Wang; J. Weller; O. R. Williams; G. Zamorani; E. Zucca; A. Biviano; C. Burigana; V. Scottez; P. Simon; M. Balogh; D. Scott

doi:10.1051/0004-6361/202450784

Euclid Early Release Observations -- Globular clusters in the Fornax galaxy cluster, from dwarf galaxies to the intracluster field

Euclid Collaboration, T. Saifollahi^*, K. Voggel, A. Lançon, Michele Cantiello, M. A. Raj, J. -C. Cuillandre, S. S. Larsen, F. R. Marleau, A. Venhola, M. Schirmer, D. Carollo, P. -A. Duc, A. M. N. Ferguson, L. K. Hunt, M. Kümmel, R. Laureijs, O. Marchal, A. A. Nucita, R. F. PeletierM. Poulain, M. Rejkuba, R. Sánchez-Janssen, M. Urbano, Abdurro'uf, B. Altieri, M. Baes, M. Bolzonella, C. J. Conselice, P. Cote, P. Dimauro, A. H. Gonzalez, R. Habas, P. Hudelot, M. Kluge, P. Lonare, D. Massari, E. Romelli, R. Scaramella, E. Sola, C. Stone, C. Tortora, S. E. van Mierlo, J. H. Knapen, J. Martín-Fleitas, A. Mora, J. Román, N. Aghanim, A. Amara, S. Andreon, N. Auricchio, M. Baldi, A. Balestra, S. Bardelli, A. Basset, R. Bender, D. Bonino, E. Branchini, M. Brescia, J. Brinchmann, S. Camera, V. Capobianco, C. Carbone, J. Carretero, S. Casas, M. Castellano, S. Cavuoti, A. Cimatti, G. Congedo, L. Conversi, Y. Copin, F. Courbin, H. M. Courtois, M. Cropper, A. Da Silva, H. Degaudenzi, A. M. Di Giorgio, J. Dinis, F. Dubath, X. Dupac, S. Dusini, M. Fabricius, M. Farina, S. Farrens, S. Ferriol, P. Fosalba, M. Frailis, E. Franceschi, M. Fumana, S. Galeotta, B. Garilli, W. Gillard, B. Gillis, C. Giocoli, P. Gómez-Alvarez, B. R. Granett, A. Grazian, F. Grupp, L. Guzzo, S. V. H. Haugan, J. Hoar, H. Hoekstra, W. Holmes, I. Hook, F. Hormuth, A. Hornstrup, K. Jahnke, M. Jhabvala, E. Keihänen, S. Kermiche, A. Kiessling, T. Kitching, R. Kohley, B. Kubik, K. Kuijken, M. Kunz, H. Kurki-Suonio, O. Lahav, D. Le Mignant, S. Ligori, P. B. Lilje, V. Lindholm, I. Lloro, D. Maino, E. Maiorano, O. Mansutti, O. Marggraf, K. Markovic, N. Martinet, F. Marulli, R. Massey, S. Maurogordato, H. J. McCracken, E. Medinaceli, S. Mei, M. Melchior, Y. Mellier, M. Meneghetti, G. Meylan, M. Moresco, L. Moscardini, E. Munari, R. Nakajima, R. C. Nichol, S. -M. Niemi, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, W. J. Percival, V. Pettorino, S. Pires, G. Polenta, M. Poncet, L. A. Popa, L. Pozzetti, G. D. Racca, F. Raison, R. Rebolo, A. Refregier, A. Renzi, J. Rhodes, G. Riccio, M. Roncarelli, E. Rossetti, R. Saglia, D. Sapone, B. Sartoris, P. Schneider, T. Schrabback, A. Secroun, G. Seidel, S. Serrano, C. Sirignano, G. Sirri, L. Stanco, P. Tallada-Crespí, A. N. Taylor, H. I. Teplitz, I. Tereno, R. Toledo-Moreo, F. Torradeflot, A. Tsyganov, I. Tutusaus, E. A. Valentijn, L. Valenziano, T. Vassallo, G. Verdoes Kleijn, A. Veropalumbo, Y. Wang, J. Weller, O. R. Williams, G. Zamorani, E. Zucca, A. Biviano, C. Burigana, V. Scottez, P. Simon, M. Balogh, D. Scott

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

We present an analysis of Euclid observations of a 0.5 deg2 field in the central region of the Fornax galaxy cluster that were acquired during the performance verification phase. With these data, we investigate the potential of Euclid for identifying GCs at 20 Mpc, and validate the search methods using artificial GCs and known GCs within the field from the literature. Our analysis of artificial GCs injected into the data shows that Euclid's data in IE band is 80% complete at about IE∼26.0 mag (MV∼−5.0 mag), and resolves GCs as small as rh=2.5 pc. In the IE band, we detect more than 95% of the known GCs from previous spectroscopic surveys and GC candidates of the ACS Fornax Cluster Survey, of which more than 80% are resolved. We identify more than 5000 new GC candidates within the field of view down to IE mag, about 1.5 mag fainter than the typical GC luminosity function turn-over magnitude, and investigate their spatial distribution within the intracluster field. We then focus on the GC candidates around dwarf galaxies and investigate their numbers, stacked luminosity distribution and stacked radial distribution. While the overall GC properties are consistent with those in the literature, an interesting over-representation of relatively bright candidates is found within a small number of relatively GC-rich dwarf galaxies. Our work confirms the capabilities of Euclid data in detecting GCs and separating them from foreground and background contaminants at a distance of 20 Mpc, particularly for low-GC count systems such as dwarf galaxies.

Original language	English
Article number	A10
Pages (from-to)	1-28
Number of pages	28
Journal	Astronomy and Astrophysics
Volume	697
Early online date	30 Apr 2025
DOIs	https://doi.org/10.1051/0004-6361/202450784
Publication status	Published - 1 May 2025

Keywords / Materials (for Non-textual outputs)

Galaxies: clusters: individual: Fornax
Galaxies: star clusters:: general

Access to Document

10.1051/0004-6361/202450784Licence: Creative Commons: Attribution (CC-BY)

https://arxiv.org/abs/2405.13500Licence: Creative Commons: Attribution (CC-BY)

The Archaeological Record in Local Galaxy Stellar Halos
Ferguson, A. (Principal Investigator)
Science and Technology Facilities Council
1/04/24 → 31/03/27
Project: Research

Cite this

Euclid Collaboration, Saifollahi, T., Voggel, K., Lançon, A., Cantiello, M., Raj, M. A., Cuillandre, J. .-C., Larsen, S. S., Marleau, F. R., Venhola, A., Schirmer, M., Carollo, D., Duc, P. .-A., Ferguson, A. M. N., Hunt, L. K., Kümmel, M., Laureijs, R., Marchal, O., Nucita, A. A., ... Scott, D. (2025). Euclid Early Release Observations -- Globular clusters in the Fornax galaxy cluster, from dwarf galaxies to the intracluster field. Astronomy and Astrophysics, 697, 1-28. Article A10. https://doi.org/10.1051/0004-6361/202450784

@article{43bea492471140198b192059e280660b,

title = "Euclid Early Release Observations -- Globular clusters in the Fornax galaxy cluster, from dwarf galaxies to the intracluster field",

abstract = "We present an analysis of Euclid observations of a 0.5 deg2 field in the central region of the Fornax galaxy cluster that were acquired during the performance verification phase. With these data, we investigate the potential of Euclid for identifying GCs at 20 Mpc, and validate the search methods using artificial GCs and known GCs within the field from the literature. Our analysis of artificial GCs injected into the data shows that Euclid's data in IE band is 80% complete at about IE∼26.0 mag (MV∼−5.0 mag), and resolves GCs as small as rh=2.5 pc. In the IE band, we detect more than 95% of the known GCs from previous spectroscopic surveys and GC candidates of the ACS Fornax Cluster Survey, of which more than 80% are resolved. We identify more than 5000 new GC candidates within the field of view down to IE mag, about 1.5 mag fainter than the typical GC luminosity function turn-over magnitude, and investigate their spatial distribution within the intracluster field. We then focus on the GC candidates around dwarf galaxies and investigate their numbers, stacked luminosity distribution and stacked radial distribution. While the overall GC properties are consistent with those in the literature, an interesting over-representation of relatively bright candidates is found within a small number of relatively GC-rich dwarf galaxies. Our work confirms the capabilities of Euclid data in detecting GCs and separating them from foreground and background contaminants at a distance of 20 Mpc, particularly for low-GC count systems such as dwarf galaxies. ",

keywords = "Galaxies: clusters: individual: Fornax, Galaxies: star clusters:: general",

author = "{Euclid Collaboration} and T. Saifollahi and K. Voggel and A. Lan{\c c}on and Michele Cantiello and Raj, {M. A.} and Cuillandre, {J. -C.} and Larsen, {S. S.} and Marleau, {F. R.} and A. Venhola and M. Schirmer and D. Carollo and Duc, {P. -A.} and Ferguson, {A. M. N.} and Hunt, {L. K.} and M. K{\"u}mmel and R. Laureijs and O. Marchal and Nucita, {A. A.} and Peletier, {R. F.} and M. Poulain and M. Rejkuba and R. S{\'a}nchez-Janssen and M. Urbano and Abdurro'uf and B. Altieri and M. Baes and M. Bolzonella and Conselice, {C. J.} and P. Cote and P. Dimauro and Gonzalez, {A. H.} and R. Habas and P. Hudelot and M. Kluge and P. Lonare and D. Massari and E. Romelli and R. Scaramella and E. Sola and C. Stone and C. Tortora and Mierlo, {S. E. van} and Knapen, {J. H.} and J. Mart{\'i}n-Fleitas and A. Mora and J. Rom{\'a}n and N. Aghanim and A. Amara and S. Andreon and N. Auricchio and M. Baldi and A. Balestra and S. Bardelli and A. Basset and R. Bender and D. Bonino and E. Branchini and M. Brescia and J. Brinchmann and S. Camera and V. Capobianco and C. Carbone and J. Carretero and S. Casas and M. Castellano and S. Cavuoti and A. Cimatti and G. Congedo and L. Conversi and Y. Copin and F. Courbin and Courtois, {H. M.} and M. Cropper and Silva, {A. Da} and H. Degaudenzi and Giorgio, {A. M. Di} and J. Dinis and F. Dubath and X. Dupac and S. Dusini and M. Fabricius and M. Farina and S. Farrens and S. Ferriol and P. Fosalba and M. Frailis and E. Franceschi and M. Fumana and S. Galeotta and B. Garilli and W. Gillard and B. Gillis and C. Giocoli and P. G{\'o}mez-Alvarez and Granett, {B. R.} and A. Grazian and F. Grupp and L. Guzzo and Haugan, {S. V. H.} and J. Hoar and H. Hoekstra and W. Holmes and I. Hook and F. Hormuth and A. Hornstrup and K. Jahnke and M. Jhabvala and E. Keih{\"a}nen and S. Kermiche and A. Kiessling and T. Kitching and R. Kohley and B. Kubik and K. Kuijken and M. Kunz and H. Kurki-Suonio and O. Lahav and Mignant, {D. Le} and S. Ligori and Lilje, {P. B.} and V. Lindholm and I. Lloro and D. Maino and E. Maiorano and O. Mansutti and O. Marggraf and K. Markovic and N. Martinet and F. Marulli and R. Massey and S. Maurogordato and McCracken, {H. J.} and E. Medinaceli and S. Mei and M. Melchior and Y. Mellier and M. Meneghetti and G. Meylan and M. Moresco and L. Moscardini and E. Munari and R. Nakajima and Nichol, {R. C.} and Niemi, {S. -M.} and C. Padilla and S. Paltani and F. Pasian and K. Pedersen and Percival, {W. J.} and V. Pettorino and S. Pires and G. Polenta and M. Poncet and Popa, {L. A.} and L. Pozzetti and Racca, {G. D.} and F. Raison and R. Rebolo and A. Refregier and A. Renzi and J. Rhodes and G. Riccio and M. Roncarelli and E. Rossetti and R. Saglia and D. Sapone and B. Sartoris and P. Schneider and T. Schrabback and A. Secroun and G. Seidel and S. Serrano and C. Sirignano and G. Sirri and L. Stanco and P. Tallada-Cresp{\'i} and Taylor, {A. N.} and Teplitz, {H. I.} and I. Tereno and R. Toledo-Moreo and F. Torradeflot and A. Tsyganov and I. Tutusaus and Valentijn, {E. A.} and L. Valenziano and T. Vassallo and Kleijn, {G. Verdoes} and A. Veropalumbo and Y. Wang and J. Weller and Williams, {O. R.} and G. Zamorani and E. Zucca and A. Biviano and C. Burigana and V. Scottez and P. Simon and M. Balogh and D. Scott",

note = "Paper submitted as part of the A&A special issue `Euclid on Sky', which contains Euclid key reference papers and first results from the Euclid Early Release Observations",

year = "2025",

month = may,

day = "1",

doi = "10.1051/0004-6361/202450784",

language = "English",

volume = "697",

pages = "1--28",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Euclid Collaboration, Saifollahi, T, Voggel, K, Lançon, A, Cantiello, M, Raj, MA, Cuillandre, J-C, Larsen, SS, Marleau, FR, Venhola, A, Schirmer, M, Carollo, D, Duc, P-A, Ferguson, AMN, Hunt, LK, Kümmel, M, Laureijs, R, Marchal, O, Nucita, AA, Peletier, RF, Poulain, M, Rejkuba, M, Sánchez-Janssen, R, Urbano, M, Abdurro'uf, Altieri, B, Baes, M, Bolzonella, M, Conselice, CJ, Cote, P, Dimauro, P, Gonzalez, AH, Habas, R, Hudelot, P, Kluge, M, Lonare, P, Massari, D, Romelli, E, Scaramella, R, Sola, E, Stone, C, Tortora, C, Mierlo, SEV, Knapen, JH, Martín-Fleitas, J, Mora, A, Román, J, Aghanim, N, Amara, A, Andreon, S, Auricchio, N, Baldi, M, Balestra, A, Bardelli, S, Basset, A, Bender, R, Bonino, D, Branchini, E, Brescia, M, Brinchmann, J, Camera, S, Capobianco, V, Carbone, C, Carretero, J, Casas, S, Castellano, M, Cavuoti, S, Cimatti, A, Congedo, G, Conversi, L, Copin, Y, Courbin, F, Courtois, HM, Cropper, M, Silva, AD, Degaudenzi, H, Giorgio, AMD, Dinis, J, Dubath, F, Dupac, X, Dusini, S, Fabricius, M, Farina, M, Farrens, S, Ferriol, S, Fosalba, P, Frailis, M, Franceschi, E, Fumana, M, Galeotta, S, Garilli, B, Gillard, W, Gillis, B, Giocoli, C, Gómez-Alvarez, P, Granett, BR, Grazian, A, Grupp, F, Guzzo, L, Haugan, SVH, Hoar, J, Hoekstra, H, Holmes, W, Hook, I, Hormuth, F, Hornstrup, A, Jahnke, K, Jhabvala, M, Keihänen, E, Kermiche, S, Kiessling, A, Kitching, T, Kohley, R, Kubik, B, Kuijken, K, Kunz, M, Kurki-Suonio, H, Lahav, O, Mignant, DL, Ligori, S, Lilje, PB, Lindholm, V, Lloro, I, Maino, D, Maiorano, E, Mansutti, O, Marggraf, O, Markovic, K, Martinet, N, Marulli, F, Massey, R, Maurogordato, S, McCracken, HJ, Medinaceli, E, Mei, S, Melchior, M, Mellier, Y, Meneghetti, M, Meylan, G, Moresco, M, Moscardini, L, Munari, E, Nakajima, R, Nichol, RC, Niemi, S-M, Padilla, C, Paltani, S, Pasian, F, Pedersen, K, Percival, WJ, Pettorino, V, Pires, S, Polenta, G, Poncet, M, Popa, LA, Pozzetti, L, Racca, GD, Raison, F, Rebolo, R, Refregier, A, Renzi, A, Rhodes, J, Riccio, G, Roncarelli, M, Rossetti, E, Saglia, R, Sapone, D, Sartoris, B, Schneider, P, Schrabback, T, Secroun, A, Seidel, G, Serrano, S, Sirignano, C, Sirri, G, Stanco, L, Tallada-Crespí, P, Taylor, AN, Teplitz, HI, Tereno, I, Toledo-Moreo, R, Torradeflot, F, Tsyganov, A, Tutusaus, I, Valentijn, EA, Valenziano, L, Vassallo, T, Kleijn, GV, Veropalumbo, A, Wang, Y, Weller, J, Williams, OR, Zamorani, G, Zucca, E, Biviano, A, Burigana, C, Scottez, V, Simon, P, Balogh, M & Scott, D 2025, 'Euclid Early Release Observations -- Globular clusters in the Fornax galaxy cluster, from dwarf galaxies to the intracluster field', Astronomy and Astrophysics, vol. 697, A10, pp. 1-28. https://doi.org/10.1051/0004-6361/202450784

TY - JOUR

T1 - Euclid Early Release Observations -- Globular clusters in the Fornax galaxy cluster, from dwarf galaxies to the intracluster field

AU - Euclid Collaboration

AU - Saifollahi, T.

AU - Voggel, K.

AU - Lançon, A.

AU - Cantiello, Michele

AU - Raj, M. A.

AU - Cuillandre, J. -C.

AU - Larsen, S. S.

AU - Marleau, F. R.

AU - Venhola, A.

AU - Schirmer, M.

AU - Carollo, D.

AU - Duc, P. -A.

AU - Ferguson, A. M. N.

AU - Hunt, L. K.

AU - Kümmel, M.

AU - Laureijs, R.

AU - Marchal, O.

AU - Nucita, A. A.

AU - Peletier, R. F.

AU - Poulain, M.

AU - Rejkuba, M.

AU - Sánchez-Janssen, R.

AU - Urbano, M.

AU - Abdurro'uf, null

AU - Altieri, B.

AU - Baes, M.

AU - Bolzonella, M.

AU - Conselice, C. J.

AU - Cote, P.

AU - Dimauro, P.

AU - Gonzalez, A. H.

AU - Habas, R.

AU - Hudelot, P.

AU - Kluge, M.

AU - Lonare, P.

AU - Massari, D.

AU - Romelli, E.

AU - Scaramella, R.

AU - Sola, E.

AU - Stone, C.

AU - Tortora, C.

AU - Mierlo, S. E. van

AU - Knapen, J. H.

AU - Martín-Fleitas, J.

AU - Mora, A.

AU - Román, J.

AU - Aghanim, N.

AU - Amara, A.

AU - Andreon, S.

AU - Auricchio, N.

AU - Baldi, M.

AU - Balestra, A.

AU - Bardelli, S.

AU - Basset, A.

AU - Bender, R.

AU - Bonino, D.

AU - Branchini, E.

AU - Brescia, M.

AU - Brinchmann, J.

AU - Camera, S.

AU - Capobianco, V.

AU - Carbone, C.

AU - Carretero, J.

AU - Casas, S.

AU - Castellano, M.

AU - Cavuoti, S.

AU - Cimatti, A.

AU - Congedo, G.

AU - Conversi, L.

AU - Copin, Y.

AU - Courbin, F.

AU - Courtois, H. M.

AU - Cropper, M.

AU - Silva, A. Da

AU - Degaudenzi, H.

AU - Giorgio, A. M. Di

AU - Dinis, J.

AU - Dubath, F.

AU - Dupac, X.

AU - Dusini, S.

AU - Fabricius, M.

AU - Farina, M.

AU - Farrens, S.

AU - Ferriol, S.

AU - Fosalba, P.

AU - Frailis, M.

AU - Franceschi, E.

AU - Fumana, M.

AU - Galeotta, S.

AU - Garilli, B.

AU - Gillard, W.

AU - Gillis, B.

AU - Giocoli, C.

AU - Gómez-Alvarez, P.

AU - Granett, B. R.

AU - Grazian, A.

AU - Grupp, F.

AU - Guzzo, L.

AU - Haugan, S. V. H.

AU - Hoar, J.

AU - Hoekstra, H.

AU - Holmes, W.

AU - Hook, I.

AU - Hormuth, F.

AU - Hornstrup, A.

AU - Jahnke, K.

AU - Jhabvala, M.

AU - Keihänen, E.

AU - Kermiche, S.

AU - Kiessling, A.

AU - Kitching, T.

AU - Kohley, R.

AU - Kubik, B.

AU - Kuijken, K.

AU - Kunz, M.

AU - Kurki-Suonio, H.

AU - Lahav, O.

AU - Mignant, D. Le

AU - Ligori, S.

AU - Lilje, P. B.

AU - Lindholm, V.

AU - Lloro, I.

AU - Maino, D.

AU - Maiorano, E.

AU - Mansutti, O.

AU - Marggraf, O.

AU - Markovic, K.

AU - Martinet, N.

AU - Marulli, F.

AU - Massey, R.

AU - Maurogordato, S.

AU - McCracken, H. J.

AU - Medinaceli, E.

AU - Mei, S.

AU - Melchior, M.

AU - Mellier, Y.

AU - Meneghetti, M.

AU - Meylan, G.

AU - Moresco, M.

AU - Moscardini, L.

AU - Munari, E.

AU - Nakajima, R.

AU - Nichol, R. C.

AU - Niemi, S. -M.

AU - Padilla, C.

AU - Paltani, S.

AU - Pasian, F.

AU - Pedersen, K.

AU - Percival, W. J.

AU - Pettorino, V.

AU - Pires, S.

AU - Polenta, G.

AU - Poncet, M.

AU - Popa, L. A.

AU - Pozzetti, L.

AU - Racca, G. D.

AU - Raison, F.

AU - Rebolo, R.

AU - Refregier, A.

AU - Renzi, A.

AU - Rhodes, J.

AU - Riccio, G.

AU - Roncarelli, M.

AU - Rossetti, E.

AU - Saglia, R.

AU - Sapone, D.

AU - Sartoris, B.

AU - Schneider, P.

AU - Schrabback, T.

AU - Secroun, A.

AU - Seidel, G.

AU - Serrano, S.

AU - Sirignano, C.

AU - Sirri, G.

AU - Stanco, L.

AU - Tallada-Crespí, P.

AU - Taylor, A. N.

AU - Teplitz, H. I.

AU - Tereno, I.

AU - Toledo-Moreo, R.

AU - Torradeflot, F.

AU - Tsyganov, A.

AU - Tutusaus, I.

AU - Valentijn, E. A.

AU - Valenziano, L.

AU - Vassallo, T.

AU - Kleijn, G. Verdoes

AU - Veropalumbo, A.

AU - Wang, Y.

AU - Weller, J.

AU - Williams, O. R.

AU - Zamorani, G.

AU - Zucca, E.

AU - Biviano, A.

AU - Burigana, C.

AU - Scottez, V.

AU - Simon, P.

AU - Balogh, M.

AU - Scott, D.

N1 - Paper submitted as part of the A&A special issue `Euclid on Sky', which contains Euclid key reference papers and first results from the Euclid Early Release Observations

PY - 2025/5/1

Y1 - 2025/5/1

N2 - We present an analysis of Euclid observations of a 0.5 deg2 field in the central region of the Fornax galaxy cluster that were acquired during the performance verification phase. With these data, we investigate the potential of Euclid for identifying GCs at 20 Mpc, and validate the search methods using artificial GCs and known GCs within the field from the literature. Our analysis of artificial GCs injected into the data shows that Euclid's data in IE band is 80% complete at about IE∼26.0 mag (MV∼−5.0 mag), and resolves GCs as small as rh=2.5 pc. In the IE band, we detect more than 95% of the known GCs from previous spectroscopic surveys and GC candidates of the ACS Fornax Cluster Survey, of which more than 80% are resolved. We identify more than 5000 new GC candidates within the field of view down to IE mag, about 1.5 mag fainter than the typical GC luminosity function turn-over magnitude, and investigate their spatial distribution within the intracluster field. We then focus on the GC candidates around dwarf galaxies and investigate their numbers, stacked luminosity distribution and stacked radial distribution. While the overall GC properties are consistent with those in the literature, an interesting over-representation of relatively bright candidates is found within a small number of relatively GC-rich dwarf galaxies. Our work confirms the capabilities of Euclid data in detecting GCs and separating them from foreground and background contaminants at a distance of 20 Mpc, particularly for low-GC count systems such as dwarf galaxies.

AB - We present an analysis of Euclid observations of a 0.5 deg2 field in the central region of the Fornax galaxy cluster that were acquired during the performance verification phase. With these data, we investigate the potential of Euclid for identifying GCs at 20 Mpc, and validate the search methods using artificial GCs and known GCs within the field from the literature. Our analysis of artificial GCs injected into the data shows that Euclid's data in IE band is 80% complete at about IE∼26.0 mag (MV∼−5.0 mag), and resolves GCs as small as rh=2.5 pc. In the IE band, we detect more than 95% of the known GCs from previous spectroscopic surveys and GC candidates of the ACS Fornax Cluster Survey, of which more than 80% are resolved. We identify more than 5000 new GC candidates within the field of view down to IE mag, about 1.5 mag fainter than the typical GC luminosity function turn-over magnitude, and investigate their spatial distribution within the intracluster field. We then focus on the GC candidates around dwarf galaxies and investigate their numbers, stacked luminosity distribution and stacked radial distribution. While the overall GC properties are consistent with those in the literature, an interesting over-representation of relatively bright candidates is found within a small number of relatively GC-rich dwarf galaxies. Our work confirms the capabilities of Euclid data in detecting GCs and separating them from foreground and background contaminants at a distance of 20 Mpc, particularly for low-GC count systems such as dwarf galaxies.

KW - Galaxies: clusters: individual: Fornax

KW - Galaxies: star clusters:: general

U2 - 10.1051/0004-6361/202450784

DO - 10.1051/0004-6361/202450784

M3 - Article

SN - 0004-6361

VL - 697

SP - 1

EP - 28

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A10

ER -

Euclid Early Release Observations -- Globular clusters in the Fornax galaxy cluster, from dwarf galaxies to the intracluster field

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