Euclid: High-precision imaging astrometry and photometry from Early Release Observations I. Internal kinematics of NGC6397 by combining Euclid and Gaia data

Euclid Collaboration; M. Libralato; L. R. Bedin; M. Griggio; D. Massari; J. Anderson; J. -C. Cuillandre; A. M. N. Ferguson; A. Lançon; S. S. Larsen; M. Schirmer; F. Annibali; E. Balbinot; E. Dalessandro; D. Erkal; P. B. Kuzma; T. Saifollahi; G. Verdoes Kleijn; M. Kümmel; R. Nakajima; M. Correnti; G. Battaglia; B. Altieri; A. Amara; S. Andreon; C. Baccigalupi; M. Baldi; A. Balestra; S. Bardelli; A. Basset; P. Battaglia; D. Bonino; E. Branchini; M. Brescia; J. Brinchmann; A. Caillat; S. Camera; V. Capobianco; C. Carbone; J. Carretero; S. Casas; M. Castellano; G. Castignani; S. Cavuoti; A. Cimatti; C. Colodro-Conde; G. Congedo; C. J. Conselice; L. Conversi; Y. Copin; F. Courbin; H. M. Courtois; M. Cropper; A. Da Silva; H. Degaudenzi; G. De Lucia; J. Dinis; F. Dubath; X. Dupac; S. Dusini; M. Fabricius; M. Farina; S. Farrens; F. Faustini; S. Ferriol; P. Fosalba; M. Frailis; E. Franceschi; M. Fumana; S. Galeotta; B. Garilli; K. George; W. Gillard; B. Gillis; C. Giocoli; P. Gómez-Alvarez; A. Grazian; F. Grupp; L. Guzzo; S. V. H. Haugan; J. Hoar; H. Hoekstra; W. Holmes; F. Hormuth; A. Hornstrup; P. Hudelot; K. Jahnke; M. Jhabvala; E. Keihänen; S. Kermiche; A. Kiessling; M. Kilbinger; B. Kubik; M. Kunz; H. Kurki-Suonio; R. Laureijs; D. Le Mignant; S. Ligori; P. B. Lilje; V. Lindholm; I. Lloro; E. Maiorano; O. Mansutti; O. Marggraf; K. Markovic; M. Martinelli; N. Martinet; F. Marulli; R. Massey; E. Medinaceli; S. Mei; M. Melchior; Y. Mellier; M. Meneghetti; E. Merlin; G. Meylan; M. Moresco; L. Moscardini; C. Neissner; R. C. Nichol; S. -M. Niemi; J. W. Nightingale; C. Padilla; S. Paltani; F. Pasian; K. Pedersen; W. J. Percival; V. Pettorino; S. Pires; G. Polenta; M. Poncet; L. A. Popa; L. Pozzetti; F. Raison; R. Rebolo; A. Refregier; A. Renzi; J. Rhodes; G. Riccio; E. Romelli; M. Roncarelli; E. Rossetti; R. Saglia; Z. Sakr; A. G. Sánchez; D. Sapone; B. Sartoris; M. Sauvage; P. Schneider; T. Schrabback; A. Secroun; E. Sefusatti; G. Seidel; M. Seiffert; S. Serrano; C. Sirignano; G. Sirri; J. Skottfelt; L. Stanco; J. Steinwagner; P. Tallada-Crespí; A. N. Taylor; H. I. Teplitz; I. Tereno; R. Toledo-Moreo; F. Torradeflot; A. Tsyganov; I. Tutusaus; L. Valenziano; T. Vassallo; A. Veropalumbo; Y. Wang; J. Weller; G. Zamorani; E. Zucca; C. Burigana; V. Scottez; D. Scott; R. L. Smart

doi:10.1051/0004-6361/202452295

Euclid: High-precision imaging astrometry and photometry from Early Release Observations I. Internal kinematics of NGC6397 by combining Euclid and Gaia data

Euclid Collaboration, M. Libralato^*, L. R. Bedin, M. Griggio, D. Massari, J. Anderson, J. -C. Cuillandre, A. M. N. Ferguson, A. Lançon, S. S. Larsen, M. Schirmer, F. Annibali, E. Balbinot, E. Dalessandro, D. Erkal, P. B. Kuzma, T. Saifollahi, G. Verdoes Kleijn, M. Kümmel, R. NakajimaM. Correnti, G. Battaglia, B. Altieri, A. Amara, S. Andreon, C. Baccigalupi, M. Baldi, A. Balestra, S. Bardelli, A. Basset, P. Battaglia, D. Bonino, E. Branchini, M. Brescia, J. Brinchmann, A. Caillat, S. Camera, V. Capobianco, C. Carbone, J. Carretero, S. Casas, M. Castellano, G. Castignani, S. Cavuoti, A. Cimatti, C. Colodro-Conde, G. Congedo, C. J. Conselice, L. Conversi, Y. Copin, F. Courbin, H. M. Courtois, M. Cropper, A. Da Silva, H. Degaudenzi, G. De Lucia, J. Dinis, F. Dubath, X. Dupac, S. Dusini, M. Fabricius, M. Farina, S. Farrens, F. Faustini, S. Ferriol, P. Fosalba, M. Frailis, E. Franceschi, M. Fumana, S. Galeotta, B. Garilli, K. George, W. Gillard, B. Gillis, C. Giocoli, P. Gómez-Alvarez, A. Grazian, F. Grupp, L. Guzzo, S. V. H. Haugan, J. Hoar, H. Hoekstra, W. Holmes, F. Hormuth, A. Hornstrup, P. Hudelot, K. Jahnke, M. Jhabvala, E. Keihänen, S. Kermiche, A. Kiessling, M. Kilbinger, B. Kubik, M. Kunz, H. Kurki-Suonio, R. Laureijs, D. Le Mignant, S. Ligori, P. B. Lilje, V. Lindholm, I. Lloro, E. Maiorano, O. Mansutti, O. Marggraf, K. Markovic, M. Martinelli, N. Martinet, F. Marulli, R. Massey, E. Medinaceli, S. Mei, M. Melchior, Y. Mellier, M. Meneghetti, E. Merlin, G. Meylan, M. Moresco, L. Moscardini, C. Neissner, R. C. Nichol, S. -M. Niemi, J. W. Nightingale, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, W. J. Percival, V. Pettorino, S. Pires, G. Polenta, M. Poncet, L. A. Popa, L. Pozzetti, F. Raison, R. Rebolo, A. Refregier, A. Renzi, J. Rhodes, G. Riccio, E. Romelli, M. Roncarelli, E. Rossetti, R. Saglia, Z. Sakr, A. G. Sánchez, D. Sapone, B. Sartoris, M. Sauvage, P. Schneider, T. Schrabback, A. Secroun, E. Sefusatti, G. Seidel, M. Seiffert, S. Serrano, C. Sirignano, G. Sirri, J. Skottfelt, L. Stanco, J. Steinwagner, P. Tallada-Crespí, A. N. Taylor, H. I. Teplitz, I. Tereno, R. Toledo-Moreo, F. Torradeflot, A. Tsyganov, I. Tutusaus, L. Valenziano, T. Vassallo, A. Veropalumbo, Y. Wang, J. Weller, G. Zamorani, E. Zucca, C. Burigana, V. Scottez, D. Scott, R. L. Smart

^*Corresponding author for this work

School of Physics and Astronomy

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

Abstract

The instruments at the focus of the Euclid space observatory offer superb, diffraction-limited imaging over an unprecedented (from space) wide field of view of 0.57 deg2. This exquisite image quality has the potential to produce high-precision astrometry for point sources once the undersampling of Euclid’s cameras is taken into account by means of accurate, effective point spread function (ePSF) modelling. We present a complex, detailed workflow to simultaneously solve for the geometric distortion (GD) and model the undersampled ePSFs of the Euclid detectors. Our procedure was successfully developed and tested with data from the Early Release Observations (ERO) programme focused on the nearby globular cluster NGC 6397. Our final one-dimensional astrometric precision for a well-measured star just below saturation is 0.7 mas (0.007 pixel) for the Visible Instrument (VIS) and 3 mas (0.01 pixel) for the Near-Infrared Spectrometer and Photometer (NISP). Finally, we present a specific scientific application of this high-precision astrometry: the combination of Euclid and Gaia data to compute proper motions and study the internal kinematics of NGC 6397. Future work, when more data become available, will allow for a better characterisation of the ePSFs and GD corrections that are derived here, along with assessment of their temporal stability, and their dependencies on the spectral energy distribution of the sources as seen through the wide-band filters of Euclid.

Original language	English
Article number	A96
Pages (from-to)	1-23
Number of pages	23
Journal	Astronomy and Astrophysics
Volume	692
DOIs	https://doi.org/10.1051/0004-6361/202452295
Publication status	Published - 6 Dec 2024

Keywords / Materials (for Non-textual outputs)

techniques: photometric
astrometry
proper motions
globular clusters: individual: NGC6397

Access to Document

10.1051/0004-6361/202452295Licence: Creative Commons: Attribution (CC-BY)

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

Cite this

Euclid Collaboration, Libralato, M., Bedin, L. R., Griggio, M., Massari, D., Anderson, J., Cuillandre, J. .-C., Ferguson, A. M. N., Lançon, A., Larsen, S. S., Schirmer, M., Annibali, F., Balbinot, E., Dalessandro, E., Erkal, D., Kuzma, P. B., Saifollahi, T., Kleijn, G. V., Kümmel, M., ... Smart, R. L. (2024). Euclid: High-precision imaging astrometry and photometry from Early Release Observations I. Internal kinematics of NGC6397 by combining Euclid and Gaia data. Astronomy and Astrophysics, 692, 1-23. Article A96. https://doi.org/10.1051/0004-6361/202452295

@article{a2f65649030b4870a6a159a537338556,

title = "Euclid: High-precision imaging astrometry and photometry from Early Release Observations I. Internal kinematics of NGC6397 by combining Euclid and Gaia data",

abstract = "The instruments at the focus of the Euclid space observatory offer superb, diffraction-limited imaging over an unprecedented (from space) wide field of view of 0.57 deg2. This exquisite image quality has the potential to produce high-precision astrometry for point sources once the undersampling of Euclid{\textquoteright}s cameras is taken into account by means of accurate, effective point spread function (ePSF) modelling. We present a complex, detailed workflow to simultaneously solve for the geometric distortion (GD) and model the undersampled ePSFs of the Euclid detectors. Our procedure was successfully developed and tested with data from the Early Release Observations (ERO) programme focused on the nearby globular cluster NGC 6397. Our final one-dimensional astrometric precision for a well-measured star just below saturation is 0.7 mas (0.007 pixel) for the Visible Instrument (VIS) and 3 mas (0.01 pixel) for the Near-Infrared Spectrometer and Photometer (NISP). Finally, we present a specific scientific application of this high-precision astrometry: the combination of Euclid and Gaia data to compute proper motions and study the internal kinematics of NGC 6397. Future work, when more data become available, will allow for a better characterisation of the ePSFs and GD corrections that are derived here, along with assessment of their temporal stability, and their dependencies on the spectral energy distribution of the sources as seen through the wide-band filters of Euclid.",

keywords = "techniques: photometric, astrometry, proper motions, globular clusters: individual: NGC6397",

author = "{Euclid Collaboration} and M. Libralato and Bedin, {L. R.} and M. Griggio and D. Massari and J. Anderson and Cuillandre, {J. -C.} and Ferguson, {A. M. N.} and A. Lan{\c c}on and Larsen, {S. S.} and M. Schirmer and F. Annibali and E. Balbinot and E. Dalessandro and D. Erkal and Kuzma, {P. B.} and T. Saifollahi and Kleijn, {G. Verdoes} and M. K{\"u}mmel and R. Nakajima and M. Correnti and G. Battaglia and B. Altieri and A. Amara and S. Andreon and C. Baccigalupi and M. Baldi and A. Balestra and S. Bardelli and A. Basset and P. Battaglia and D. Bonino and E. Branchini and M. Brescia and J. Brinchmann and A. Caillat and S. Camera and V. Capobianco and C. Carbone and J. Carretero and S. Casas and M. Castellano and G. Castignani and S. Cavuoti and A. Cimatti and C. Colodro-Conde and G. Congedo and Conselice, {C. J.} and L. Conversi and Y. Copin and F. Courbin and Courtois, {H. M.} and M. Cropper and Silva, {A. Da} and H. Degaudenzi and Lucia, {G. De} and J. Dinis and F. Dubath and X. Dupac and S. Dusini and M. Fabricius and M. Farina and S. Farrens and F. Faustini and S. Ferriol and P. Fosalba and M. Frailis and E. Franceschi and M. Fumana and S. Galeotta and B. Garilli and K. George and W. Gillard and B. Gillis and C. Giocoli and P. G{\'o}mez-Alvarez and A. Grazian and F. Grupp and L. Guzzo and Haugan, {S. V. H.} and J. Hoar and H. Hoekstra and W. Holmes and F. Hormuth and A. Hornstrup and P. Hudelot and K. Jahnke and M. Jhabvala and E. Keih{\"a}nen and S. Kermiche and A. Kiessling and M. Kilbinger and B. Kubik and M. Kunz and H. Kurki-Suonio and R. Laureijs and Mignant, {D. Le} and S. Ligori and Lilje, {P. B.} and V. Lindholm and I. Lloro and E. Maiorano and O. Mansutti and O. Marggraf and K. Markovic and M. Martinelli and N. Martinet and F. Marulli and R. Massey and E. Medinaceli and S. Mei and M. Melchior and Y. Mellier and M. Meneghetti and E. Merlin and G. Meylan and M. Moresco and L. Moscardini and C. Neissner and Nichol, {R. C.} and Niemi, {S. -M.} and Nightingale, {J. W.} 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 F. Raison and R. Rebolo and A. Refregier and A. Renzi and J. Rhodes and G. Riccio and E. Romelli and M. Roncarelli and E. Rossetti and R. Saglia and Z. Sakr and S{\'a}nchez, {A. G.} and D. Sapone and B. Sartoris and M. Sauvage and P. Schneider and T. Schrabback and A. Secroun and E. Sefusatti and G. Seidel and M. Seiffert and S. Serrano and C. Sirignano and G. Sirri and J. Skottfelt and L. Stanco and J. Steinwagner 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 L. Valenziano and T. Vassallo and A. Veropalumbo and Y. Wang and J. Weller and G. Zamorani and E. Zucca and C. Burigana and V. Scottez and D. Scott and Smart, {R. L.}",

note = "23 pages, 21 figures. Accepted for publication in A&A on October 24, 2024. Astro-photometric catalogs and stacked images will be available at the CDS after the paper will be published",

year = "2024",

month = dec,

day = "6",

doi = "10.1051/0004-6361/202452295",

language = "English",

volume = "692",

pages = "1--23",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Euclid Collaboration, Libralato, M, Bedin, LR, Griggio, M, Massari, D, Anderson, J, Cuillandre, J-C, Ferguson, AMN, Lançon, A, Larsen, SS, Schirmer, M, Annibali, F, Balbinot, E, Dalessandro, E, Erkal, D, Kuzma, PB, Saifollahi, T, Kleijn, GV, Kümmel, M, Nakajima, R, Correnti, M, Battaglia, G, Altieri, B, Amara, A, Andreon, S, Baccigalupi, C, Baldi, M, Balestra, A, Bardelli, S, Basset, A, Battaglia, P, Bonino, D, Branchini, E, Brescia, M, Brinchmann, J, Caillat, A, Camera, S, Capobianco, V, Carbone, C, Carretero, J, Casas, S, Castellano, M, Castignani, G, Cavuoti, S, Cimatti, A, Colodro-Conde, C, Congedo, G, Conselice, CJ, Conversi, L, Copin, Y, Courbin, F, Courtois, HM, Cropper, M, Silva, AD, Degaudenzi, H, Lucia, GD, Dinis, J, Dubath, F, Dupac, X, Dusini, S, Fabricius, M, Farina, M, Farrens, S, Faustini, F, Ferriol, S, Fosalba, P, Frailis, M, Franceschi, E, Fumana, M, Galeotta, S, Garilli, B, George, K, Gillard, W, Gillis, B, Giocoli, C, Gómez-Alvarez, P, Grazian, A, Grupp, F, Guzzo, L, Haugan, SVH, Hoar, J, Hoekstra, H, Holmes, W, Hormuth, F, Hornstrup, A, Hudelot, P, Jahnke, K, Jhabvala, M, Keihänen, E, Kermiche, S, Kiessling, A, Kilbinger, M, Kubik, B, Kunz, M, Kurki-Suonio, H, Laureijs, R, Mignant, DL, Ligori, S, Lilje, PB, Lindholm, V, Lloro, I, Maiorano, E, Mansutti, O, Marggraf, O, Markovic, K, Martinelli, M, Martinet, N, Marulli, F, Massey, R, Medinaceli, E, Mei, S, Melchior, M, Mellier, Y, Meneghetti, M, Merlin, E, Meylan, G, Moresco, M, Moscardini, L, Neissner, C, Nichol, RC, Niemi, S-M, Nightingale, JW, Padilla, C, Paltani, S, Pasian, F, Pedersen, K, Percival, WJ, Pettorino, V, Pires, S, Polenta, G, Poncet, M, Popa, LA, Pozzetti, L, Raison, F, Rebolo, R, Refregier, A, Renzi, A, Rhodes, J, Riccio, G, Romelli, E, Roncarelli, M, Rossetti, E, Saglia, R, Sakr, Z, Sánchez, AG, Sapone, D, Sartoris, B, Sauvage, M, Schneider, P, Schrabback, T, Secroun, A, Sefusatti, E, Seidel, G, Seiffert, M, Serrano, S, Sirignano, C, Sirri, G, Skottfelt, J, Stanco, L, Steinwagner, J, Tallada-Crespí, P, Taylor, AN, Teplitz, HI, Tereno, I, Toledo-Moreo, R, Torradeflot, F, Tsyganov, A, Tutusaus, I, Valenziano, L, Vassallo, T, Veropalumbo, A, Wang, Y, Weller, J, Zamorani, G, Zucca, E, Burigana, C, Scottez, V, Scott, D & Smart, RL 2024, 'Euclid: High-precision imaging astrometry and photometry from Early Release Observations I. Internal kinematics of NGC6397 by combining Euclid and Gaia data', Astronomy and Astrophysics, vol. 692, A96, pp. 1-23. https://doi.org/10.1051/0004-6361/202452295

TY - JOUR

T1 - Euclid: High-precision imaging astrometry and photometry from Early Release Observations I. Internal kinematics of NGC6397 by combining Euclid and Gaia data

AU - Euclid Collaboration

AU - Libralato, M.

AU - Bedin, L. R.

AU - Griggio, M.

AU - Massari, D.

AU - Anderson, J.

AU - Cuillandre, J. -C.

AU - Ferguson, A. M. N.

AU - Lançon, A.

AU - Larsen, S. S.

AU - Schirmer, M.

AU - Annibali, F.

AU - Balbinot, E.

AU - Dalessandro, E.

AU - Erkal, D.

AU - Kuzma, P. B.

AU - Saifollahi, T.

AU - Kleijn, G. Verdoes

AU - Kümmel, M.

AU - Nakajima, R.

AU - Correnti, M.

AU - Battaglia, G.

AU - Altieri, B.

AU - Amara, A.

AU - Andreon, S.

AU - Baccigalupi, C.

AU - Baldi, M.

AU - Balestra, A.

AU - Bardelli, S.

AU - Basset, A.

AU - Battaglia, P.

AU - Bonino, D.

AU - Branchini, E.

AU - Brescia, M.

AU - Brinchmann, J.

AU - Caillat, A.

AU - Camera, S.

AU - Capobianco, V.

AU - Carbone, C.

AU - Carretero, J.

AU - Casas, S.

AU - Castellano, M.

AU - Castignani, G.

AU - Cavuoti, S.

AU - Cimatti, A.

AU - Colodro-Conde, C.

AU - Congedo, G.

AU - Conselice, C. J.

AU - Conversi, L.

AU - Copin, Y.

AU - Courbin, F.

AU - Courtois, H. M.

AU - Cropper, M.

AU - Silva, A. Da

AU - Degaudenzi, H.

AU - Lucia, G. De

AU - Dinis, J.

AU - Dubath, F.

AU - Dupac, X.

AU - Dusini, S.

AU - Fabricius, M.

AU - Farina, M.

AU - Farrens, S.

AU - Faustini, F.

AU - Ferriol, S.

AU - Fosalba, P.

AU - Frailis, M.

AU - Franceschi, E.

AU - Fumana, M.

AU - Galeotta, S.

AU - Garilli, B.

AU - George, K.

AU - Gillard, W.

AU - Gillis, B.

AU - Giocoli, C.

AU - Gómez-Alvarez, P.

AU - Grazian, A.

AU - Grupp, F.

AU - Guzzo, L.

AU - Haugan, S. V. H.

AU - Hoar, J.

AU - Hoekstra, H.

AU - Holmes, W.

AU - Hormuth, F.

AU - Hornstrup, A.

AU - Hudelot, P.

AU - Jahnke, K.

AU - Jhabvala, M.

AU - Keihänen, E.

AU - Kermiche, S.

AU - Kiessling, A.

AU - Kilbinger, M.

AU - Kubik, B.

AU - Kunz, M.

AU - Kurki-Suonio, H.

AU - Laureijs, R.

AU - Mignant, D. Le

AU - Ligori, S.

AU - Lilje, P. B.

AU - Lindholm, V.

AU - Lloro, I.

AU - Maiorano, E.

AU - Mansutti, O.

AU - Marggraf, O.

AU - Markovic, K.

AU - Martinelli, M.

AU - Martinet, N.

AU - Marulli, F.

AU - Massey, R.

AU - Medinaceli, E.

AU - Mei, S.

AU - Melchior, M.

AU - Mellier, Y.

AU - Meneghetti, M.

AU - Merlin, E.

AU - Meylan, G.

AU - Moresco, M.

AU - Moscardini, L.

AU - Neissner, C.

AU - Nichol, R. C.

AU - Niemi, S. -M.

AU - Nightingale, J. W.

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 - Raison, F.

AU - Rebolo, R.

AU - Refregier, A.

AU - Renzi, A.

AU - Rhodes, J.

AU - Riccio, G.

AU - Romelli, E.

AU - Roncarelli, M.

AU - Rossetti, E.

AU - Saglia, R.

AU - Sakr, Z.

AU - Sánchez, A. G.

AU - Sapone, D.

AU - Sartoris, B.

AU - Sauvage, M.

AU - Schneider, P.

AU - Schrabback, T.

AU - Secroun, A.

AU - Sefusatti, E.

AU - Seidel, G.

AU - Seiffert, M.

AU - Serrano, S.

AU - Sirignano, C.

AU - Sirri, G.

AU - Skottfelt, J.

AU - Stanco, L.

AU - Steinwagner, J.

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 - Valenziano, L.

AU - Vassallo, T.

AU - Veropalumbo, A.

AU - Wang, Y.

AU - Weller, J.

AU - Zamorani, G.

AU - Zucca, E.

AU - Burigana, C.

AU - Scottez, V.

AU - Scott, D.

AU - Smart, R. L.

N1 - 23 pages, 21 figures. Accepted for publication in A&A on October 24, 2024. Astro-photometric catalogs and stacked images will be available at the CDS after the paper will be published

PY - 2024/12/6

Y1 - 2024/12/6

N2 - The instruments at the focus of the Euclid space observatory offer superb, diffraction-limited imaging over an unprecedented (from space) wide field of view of 0.57 deg2. This exquisite image quality has the potential to produce high-precision astrometry for point sources once the undersampling of Euclid’s cameras is taken into account by means of accurate, effective point spread function (ePSF) modelling. We present a complex, detailed workflow to simultaneously solve for the geometric distortion (GD) and model the undersampled ePSFs of the Euclid detectors. Our procedure was successfully developed and tested with data from the Early Release Observations (ERO) programme focused on the nearby globular cluster NGC 6397. Our final one-dimensional astrometric precision for a well-measured star just below saturation is 0.7 mas (0.007 pixel) for the Visible Instrument (VIS) and 3 mas (0.01 pixel) for the Near-Infrared Spectrometer and Photometer (NISP). Finally, we present a specific scientific application of this high-precision astrometry: the combination of Euclid and Gaia data to compute proper motions and study the internal kinematics of NGC 6397. Future work, when more data become available, will allow for a better characterisation of the ePSFs and GD corrections that are derived here, along with assessment of their temporal stability, and their dependencies on the spectral energy distribution of the sources as seen through the wide-band filters of Euclid.

AB - The instruments at the focus of the Euclid space observatory offer superb, diffraction-limited imaging over an unprecedented (from space) wide field of view of 0.57 deg2. This exquisite image quality has the potential to produce high-precision astrometry for point sources once the undersampling of Euclid’s cameras is taken into account by means of accurate, effective point spread function (ePSF) modelling. We present a complex, detailed workflow to simultaneously solve for the geometric distortion (GD) and model the undersampled ePSFs of the Euclid detectors. Our procedure was successfully developed and tested with data from the Early Release Observations (ERO) programme focused on the nearby globular cluster NGC 6397. Our final one-dimensional astrometric precision for a well-measured star just below saturation is 0.7 mas (0.007 pixel) for the Visible Instrument (VIS) and 3 mas (0.01 pixel) for the Near-Infrared Spectrometer and Photometer (NISP). Finally, we present a specific scientific application of this high-precision astrometry: the combination of Euclid and Gaia data to compute proper motions and study the internal kinematics of NGC 6397. Future work, when more data become available, will allow for a better characterisation of the ePSFs and GD corrections that are derived here, along with assessment of their temporal stability, and their dependencies on the spectral energy distribution of the sources as seen through the wide-band filters of Euclid.

KW - techniques: photometric

KW - astrometry

KW - proper motions

KW - globular clusters: individual: NGC6397

U2 - 10.1051/0004-6361/202452295

DO - 10.1051/0004-6361/202452295

M3 - Article

SN - 0004-6361

VL - 692

SP - 1

EP - 23

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A96

ER -

Euclid: High-precision imaging astrometry and photometry from Early Release Observations I. Internal kinematics of NGC6397 by combining Euclid and Gaia data

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