Planck early results. IX. XMM-Newton follow-up for validation of Planck cluster candidates

[No Value] Planck Collaboration; N. Aghanim; M. Arnaud; M. Ashdown; J. Aumont; C. Baccigalupi; A. Balbi; A. J. Banday; R. B. Barreiro; M. Bartelmann; J. G. Bartlett; E. Battaner; K. Benabed; A. Benoît; J.-P. Bernard; M. Bersanelli; R. Bhatia; J. J. Bock; A. Bonaldi; J. R. Bond; J. Borrill; F. R. Bouchet; M. L. Brown; M. Bucher; C. Burigana; P. Cabella; C. M. Cantalupo; J.-F. Cardoso; P. Carvalho; A. Catalano; L. Cayón; A. Challinor; A. Chamballu; L.-Y. Chiang; G. Chon; P. R. Christensen; E. Churazov; D. L. Clements; S. Colafrancesco; S. Colombi; F. Couchot; A. Coulais; B. P. Crill; F. Cuttaia; A. da Silva; H. Dahle; L. Danese; P. de Bernardis; G. de Gasperis; A. de Rosa; G. de Zotti; J. Delabrouille; J.-M. Delouis; F.-X. Désert; J. M. Diego; K. Dolag; S. Donzelli; O. Doré; U. Dörl; M. Douspis; X. Dupac; G. Efstathiou; T. A. Enßlin; F. Finelli; I. Flores-Cacho; O. Forni; M. Frailis; E. Franceschi; S. Fromenteau; S. Galeotta; K. Ganga; R. T. Génova-Santos; M. Giard; G. Giardino; Y. Giraud-Héraud; J. González-Nuevo; R. González-Riestra; K. M. Górski; S. Gratton; A. Gregorio; A. Gruppuso; D. Harrison; P. Heinämäki; S. Henrot-Versillé; C. Hernández-Monteagudo; D. Herranz; S. R. Hildebrandt; E. Hivon; M. Hobson; W. A. Holmes; W. Hovest; R. J. Hoyland; K. M. Huffenberger; G. Hurier; A. H. Jaffe; M. Juvela; E. Keihänen; R. Keskitalo; T. S. Kisner; R. Kneissl; L. Knox; H. Kurki-Suonio; G. Lagache; J.-M. Lamarre; A. Lasenby; R. J. Laureijs; C. R. Lawrence; M. Le Jeune; S. Leach; R. Leonardi; A. Liddle; M. Linden-Vørnle; M. López-Caniego; P. M. Lubin; J. F. Macías-Pérez; B. Maffei; D. Maino; N. Mandolesi; R. Mann; M. Maris; F. Marleau; E. Martínez-González; S. Masi; S. Matarrese; F. Matthai; P. Mazzotta; A. Melchiorri; J.-B. Melin; L. Mendes; A. Mennella; S. Mitra; M.-A. Miville-Deschênes; A. Moneti; L. Montier; G. Morgante; D. Mortlock; D. Munshi; A. Murphy; P. Naselsky; P. Natoli; C. B. Netterfield; H. U. Nørgaard-Nielsen; F. Noviello; D. Novikov; I. Novikov; S. Osborne; F. Pajot; F. Pasian; G. Patanchon; O. Perdereau; L. Perotto; F. Perrotta; F. Piacentini; M. Piat; E. Pierpaoli; R. Piffaretti; S. Plaszczynski; E. Pointecouteau; G. Polenta; N. Ponthieu; T. Poutanen; G. W. Pratt; G. Prézeau; S. Prunet; J.-L. Puget; R. Rebolo; M. Reinecke; C. Renault; S. Ricciardi; T. Riller; I. Ristorcelli; G. Rocha; C. Rosset; J. A. Rubiño-Martín; B. Rusholme; E. Saar; M. Sandri; D. Santos; B. M. Schaefer; D. Scott; M. D. Seiffert; G. F. Smoot; J.-L. Starck; F. Stivoli; V. Stolyarov; R. Sunyaev; J.-F. Sygnet; J. A. Tauber; L. Terenzi; L. Toffolatti; M. Tomasi; J.-P. Torre; M. Tristram; J. Tuovinen; L. Valenziano; L. Vibert; P. Vielva; F. Villa; N. Vittorio; B. D. Wandelt; S. D. M. White; D. Yvon; A. Zacchei; A. Zonca

doi:10.1051/0004-6361/201116460

Planck early results. IX. XMM-Newton follow-up for validation of Planck cluster candidates

[No Value] Planck Collaboration, N. Aghanim, M. Arnaud, M. Ashdown, J. Aumont, C. Baccigalupi, A. Balbi, A. J. Banday, R. B. Barreiro, M. Bartelmann, J. G. Bartlett, E. Battaner, K. Benabed, A. Benoît, J.-P. Bernard, M. Bersanelli, R. Bhatia, J. J. Bock, A. Bonaldi, J. R. BondJ. Borrill, F. R. Bouchet, M. L. Brown, M. Bucher, C. Burigana, P. Cabella, C. M. Cantalupo, J.-F. Cardoso, P. Carvalho, A. Catalano, L. Cayón, A. Challinor, A. Chamballu, L.-Y. Chiang, G. Chon, P. R. Christensen, E. Churazov, D. L. Clements, S. Colafrancesco, S. Colombi, F. Couchot, A. Coulais, B. P. Crill, F. Cuttaia, A. da Silva, H. Dahle, L. Danese, P. de Bernardis, G. de Gasperis, A. de Rosa, G. de Zotti, J. Delabrouille, J.-M. Delouis, F.-X. Désert, J. M. Diego, K. Dolag, S. Donzelli, O. Doré, U. Dörl, M. Douspis, X. Dupac, G. Efstathiou, T. A. Enßlin, F. Finelli, I. Flores-Cacho, O. Forni, M. Frailis, E. Franceschi, S. Fromenteau, S. Galeotta, K. Ganga, R. T. Génova-Santos, M. Giard, G. Giardino, Y. Giraud-Héraud, J. González-Nuevo, R. González-Riestra, K. M. Górski, S. Gratton, A. Gregorio, A. Gruppuso, D. Harrison, P. Heinämäki, S. Henrot-Versillé, C. Hernández-Monteagudo, D. Herranz, S. R. Hildebrandt, E. Hivon, M. Hobson, W. A. Holmes, W. Hovest, R. J. Hoyland, K. M. Huffenberger, G. Hurier, A. H. Jaffe, M. Juvela, E. Keihänen, R. Keskitalo, T. S. Kisner, R. Kneissl, L. Knox, H. Kurki-Suonio, G. Lagache, J.-M. Lamarre, A. Lasenby, R. J. Laureijs, C. R. Lawrence, M. Le Jeune, S. Leach, R. Leonardi, A. Liddle, M. Linden-Vørnle, M. López-Caniego, P. M. Lubin, J. F. Macías-Pérez, B. Maffei, D. Maino, N. Mandolesi, R. Mann, M. Maris, F. Marleau, E. Martínez-González, S. Masi, S. Matarrese, F. Matthai, P. Mazzotta, A. Melchiorri, J.-B. Melin, L. Mendes, A. Mennella, S. Mitra, M.-A. Miville-Deschênes, A. Moneti, L. Montier, G. Morgante, D. Mortlock, D. Munshi, A. Murphy, P. Naselsky, P. Natoli, C. B. Netterfield, H. U. Nørgaard-Nielsen, F. Noviello, D. Novikov, I. Novikov, S. Osborne, F. Pajot, F. Pasian, G. Patanchon, O. Perdereau, L. Perotto, F. Perrotta, F. Piacentini, M. Piat, E. Pierpaoli, R. Piffaretti, S. Plaszczynski, E. Pointecouteau, G. Polenta, N. Ponthieu, T. Poutanen, G. W. Pratt, G. Prézeau, S. Prunet, J.-L. Puget, R. Rebolo, M. Reinecke, C. Renault, S. Ricciardi, T. Riller, I. Ristorcelli, G. Rocha, C. Rosset, J. A. Rubiño-Martín, B. Rusholme, E. Saar, M. Sandri, D. Santos, B. M. Schaefer, D. Scott, M. D. Seiffert, G. F. Smoot, J.-L. Starck, F. Stivoli, V. Stolyarov, R. Sunyaev, J.-F. Sygnet, J. A. Tauber, L. Terenzi, L. Toffolatti, M. Tomasi, J.-P. Torre, M. Tristram, J. Tuovinen, L. Valenziano, L. Vibert, P. Vielva, F. Villa, N. Vittorio, B. D. Wandelt, S. D. M. White, D. Yvon, A. Zacchei, A. Zonca

School of Physics and Astronomy

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

Abstract / Description of output

We present the XMM-Newton follow-up for confirmation of Planck cluster candidates. Twenty-five candidates have been observed to date using snapshot (~10ks) exposures, ten as part of a pilot programme to sample a low range of signal-to-noise ratios (4 <S/N <6), and a further 15 in a programme to observe a sample of S/N > 5 candidates. The sensitivity and spatial resolution of XMM-Newton allows unambiguous discrimination between clusters and false candidates. The 4 false candidates have S/N ≤ 4.1. A total of 21 candidates are confirmed as extended X-ray sources. Seventeen are single clusters, the majority of which are found to have highly irregular and disturbed morphologies (about ~70%). The remaining four sources are multiple systems, including the unexpected discovery of a supercluster at z = 0.45. For 20 sources we are able to derive a redshift estimate from the X-ray Fe K line (albeit of variable quality). The new clusters span the redshift range 0.09 ≲ z ≲ 0.54, with a median redshift of z ~ 0.37. A first determination is made of their X-ray properties including the characteristic size, which is used to improve the estimate of the SZ Compton parameter, Y500. The follow-up validation programme has helped to optimise the Planck candidate selection process. It has also provided a preview of the X-ray properties of these newly-discovered clusters, allowing comparison with their SZ properties, and to the X-ray and SZ properties of known clusters observed in the Planck survey. Our results suggest that Planck may have started to reveal a non-negligible population of massive dynamically perturbed objects that is under-represented in X-ray surveys. However, despite their particular properties, these new clusters appear to follow the Y500-YX relation established for X-ray selected objects, where YX is the product of the gas mass and temperature. Corresponding author: E. Pointecouteau, e-mail: [email protected]

Original language	English
Article number	A9
Number of pages	20
Journal	Astronomy & Astrophysics
Volume	536
DOIs	https://doi.org/10.1051/0004-6361/201116460
Publication status	Published - 1 Dec 2011

Access to Document

10.1051/0004-6361/201116460

http://adsabs.harvard.edu/abs/2011A%26A...536A...9P

Cite this

Planck Collaboration, N. V., Aghanim, N., Arnaud, M., Ashdown, M., Aumont, J., Baccigalupi, C., Balbi, A., Banday, A. J., Barreiro, R. B., Bartelmann, M., Bartlett, J. G., Battaner, E., Benabed, K., Benoît, A., Bernard, J.-P., Bersanelli, M., Bhatia, R., Bock, J. J., Bonaldi, A., ... Zonca, A. (2011). Planck early results. IX. XMM-Newton follow-up for validation of Planck cluster candidates. Astronomy & Astrophysics, 536, Article A9. https://doi.org/10.1051/0004-6361/201116460

@article{e5c16a7e9c1040a393c3b227580647c5,

title = "Planck early results. IX. XMM-Newton follow-up for validation of Planck cluster candidates",

abstract = "We present the XMM-Newton follow-up for confirmation of Planck cluster candidates. Twenty-five candidates have been observed to date using snapshot (~10ks) exposures, ten as part of a pilot programme to sample a low range of signal-to-noise ratios (4 <S/N <6), and a further 15 in a programme to observe a sample of S/N > 5 candidates. The sensitivity and spatial resolution of XMM-Newton allows unambiguous discrimination between clusters and false candidates. The 4 false candidates have S/N ≤ 4.1. A total of 21 candidates are confirmed as extended X-ray sources. Seventeen are single clusters, the majority of which are found to have highly irregular and disturbed morphologies (about ~70%). The remaining four sources are multiple systems, including the unexpected discovery of a supercluster at z = 0.45. For 20 sources we are able to derive a redshift estimate from the X-ray Fe K line (albeit of variable quality). The new clusters span the redshift range 0.09 ≲ z ≲ 0.54, with a median redshift of z ~ 0.37. A first determination is made of their X-ray properties including the characteristic size, which is used to improve the estimate of the SZ Compton parameter, Y500. The follow-up validation programme has helped to optimise the Planck candidate selection process. It has also provided a preview of the X-ray properties of these newly-discovered clusters, allowing comparison with their SZ properties, and to the X-ray and SZ properties of known clusters observed in the Planck survey. Our results suggest that Planck may have started to reveal a non-negligible population of massive dynamically perturbed objects that is under-represented in X-ray surveys. However, despite their particular properties, these new clusters appear to follow the Y500-YX relation established for X-ray selected objects, where YX is the product of the gas mass and temperature. Corresponding author: E. Pointecouteau, e-mail: [email protected]",

author = "{Planck Collaboration}, {[No Value]} and N. Aghanim and M. Arnaud and M. Ashdown and J. Aumont and C. Baccigalupi and A. Balbi and Banday, {A. J.} and Barreiro, {R. B.} and M. Bartelmann and Bartlett, {J. G.} and E. Battaner and K. Benabed and A. Beno{\^i}t and J.-P. Bernard and M. Bersanelli and R. Bhatia and Bock, {J. J.} and A. Bonaldi and Bond, {J. R.} and J. Borrill and Bouchet, {F. R.} and Brown, {M. L.} and M. Bucher and C. Burigana and P. Cabella and Cantalupo, {C. M.} and J.-F. Cardoso and P. Carvalho and A. Catalano and L. Cay{\'o}n and A. Challinor and A. Chamballu and L.-Y. Chiang and G. Chon and Christensen, {P. R.} and E. Churazov and Clements, {D. L.} and S. Colafrancesco and S. Colombi and F. Couchot and A. Coulais and Crill, {B. P.} and F. Cuttaia and {da Silva}, A. and H. Dahle and L. Danese and {de Bernardis}, P. and {de Gasperis}, G. and {de Rosa}, A. and {de Zotti}, G. and J. Delabrouille and J.-M. Delouis and F.-X. D{\'e}sert and Diego, {J. M.} and K. Dolag and S. Donzelli and O. Dor{\'e} and U. D{\"o}rl and M. Douspis and X. Dupac and G. Efstathiou and En{\ss}lin, {T. A.} and F. Finelli and I. Flores-Cacho and O. Forni and M. Frailis and E. Franceschi and S. Fromenteau and S. Galeotta and K. Ganga and G{\'e}nova-Santos, {R. T.} and M. Giard and G. Giardino and Y. Giraud-H{\'e}raud and J. Gonz{\'a}lez-Nuevo and R. Gonz{\'a}lez-Riestra and G{\'o}rski, {K. M.} and S. Gratton and A. Gregorio and A. Gruppuso and D. Harrison and P. Hein{\"a}m{\"a}ki and S. Henrot-Versill{\'e} and C. Hern{\'a}ndez-Monteagudo and D. Herranz and Hildebrandt, {S. R.} and E. Hivon and M. Hobson and Holmes, {W. A.} and W. Hovest and Hoyland, {R. J.} and Huffenberger, {K. M.} and G. Hurier and Jaffe, {A. H.} and M. Juvela and E. Keih{\"a}nen and R. Keskitalo and Kisner, {T. S.} and R. Kneissl and L. Knox and H. Kurki-Suonio and G. Lagache and J.-M. Lamarre and A. Lasenby and Laureijs, {R. J.} and Lawrence, {C. R.} and {Le Jeune}, M. and S. Leach and R. Leonardi and A. Liddle and M. Linden-V{\o}rnle and M. L{\'o}pez-Caniego and Lubin, {P. M.} and Mac{\'i}as-P{\'e}rez, {J. F.} and B. Maffei and D. Maino and N. Mandolesi and R. Mann and M. Maris and F. Marleau and E. Mart{\'i}nez-Gonz{\'a}lez and S. Masi and S. Matarrese and F. Matthai and P. Mazzotta and A. Melchiorri and J.-B. Melin and L. Mendes and A. Mennella and S. Mitra and M.-A. Miville-Desch{\^e}nes and A. Moneti and L. Montier and G. Morgante and D. Mortlock and D. Munshi and A. Murphy and P. Naselsky and P. Natoli and Netterfield, {C. B.} and N{\o}rgaard-Nielsen, {H. U.} and F. Noviello and D. Novikov and I. Novikov and S. Osborne and F. Pajot and F. Pasian and G. Patanchon and O. Perdereau and L. Perotto and F. Perrotta and F. Piacentini and M. Piat and E. Pierpaoli and R. Piffaretti and S. Plaszczynski and E. Pointecouteau and G. Polenta and N. Ponthieu and T. Poutanen and Pratt, {G. W.} and G. Pr{\'e}zeau and S. Prunet and J.-L. Puget and R. Rebolo and M. Reinecke and C. Renault and S. Ricciardi and T. Riller and I. Ristorcelli and G. Rocha and C. Rosset and Rubi{\~n}o-Mart{\'i}n, {J. A.} and B. Rusholme and E. Saar and M. Sandri and D. Santos and Schaefer, {B. M.} and D. Scott and Seiffert, {M. D.} and Smoot, {G. F.} and J.-L. Starck and F. Stivoli and V. Stolyarov and R. Sunyaev and J.-F. Sygnet and Tauber, {J. A.} and L. Terenzi and L. Toffolatti and M. Tomasi and J.-P. Torre and M. Tristram and J. Tuovinen and L. Valenziano and L. Vibert and P. Vielva and F. Villa and N. Vittorio and Wandelt, {B. D.} and White, {S. D. M.} and D. Yvon and A. Zacchei and A. Zonca",

year = "2011",

month = dec,

day = "1",

doi = "10.1051/0004-6361/201116460",

language = "English",

volume = "536",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Planck Collaboration, NV, Aghanim, N, Arnaud, M, Ashdown, M, Aumont, J, Baccigalupi, C, Balbi, A, Banday, AJ, Barreiro, RB, Bartelmann, M, Bartlett, JG, Battaner, E, Benabed, K, Benoît, A, Bernard, J-P, Bersanelli, M, Bhatia, R, Bock, JJ, Bonaldi, A, Bond, JR, Borrill, J, Bouchet, FR, Brown, ML, Bucher, M, Burigana, C, Cabella, P, Cantalupo, CM, Cardoso, J-F, Carvalho, P, Catalano, A, Cayón, L, Challinor, A, Chamballu, A, Chiang, L-Y, Chon, G, Christensen, PR, Churazov, E, Clements, DL, Colafrancesco, S, Colombi, S, Couchot, F, Coulais, A, Crill, BP, Cuttaia, F, da Silva, A, Dahle, H, Danese, L, de Bernardis, P, de Gasperis, G, de Rosa, A, de Zotti, G, Delabrouille, J, Delouis, J-M, Désert, F-X, Diego, JM, Dolag, K, Donzelli, S, Doré, O, Dörl, U, Douspis, M, Dupac, X, Efstathiou, G, Enßlin, TA, Finelli, F, Flores-Cacho, I, Forni, O, Frailis, M, Franceschi, E, Fromenteau, S, Galeotta, S, Ganga, K, Génova-Santos, RT, Giard, M, Giardino, G, Giraud-Héraud, Y, González-Nuevo, J, González-Riestra, R, Górski, KM, Gratton, S, Gregorio, A, Gruppuso, A, Harrison, D, Heinämäki, P, Henrot-Versillé, S, Hernández-Monteagudo, C, Herranz, D, Hildebrandt, SR, Hivon, E, Hobson, M, Holmes, WA, Hovest, W, Hoyland, RJ, Huffenberger, KM, Hurier, G, Jaffe, AH, Juvela, M, Keihänen, E, Keskitalo, R, Kisner, TS, Kneissl, R, Knox, L, Kurki-Suonio, H, Lagache, G, Lamarre, J-M, Lasenby, A, Laureijs, RJ, Lawrence, CR, Le Jeune, M, Leach, S, Leonardi, R, Liddle, A, Linden-Vørnle, M, López-Caniego, M, Lubin, PM, Macías-Pérez, JF, Maffei, B, Maino, D, Mandolesi, N, Mann, R, Maris, M, Marleau, F, Martínez-González, E, Masi, S, Matarrese, S, Matthai, F, Mazzotta, P, Melchiorri, A, Melin, J-B, Mendes, L, Mennella, A, Mitra, S, Miville-Deschênes, M-A, Moneti, A, Montier, L, Morgante, G, Mortlock, D, Munshi, D, Murphy, A, Naselsky, P, Natoli, P, Netterfield, CB, Nørgaard-Nielsen, HU, Noviello, F, Novikov, D, Novikov, I, Osborne, S, Pajot, F, Pasian, F, Patanchon, G, Perdereau, O, Perotto, L, Perrotta, F, Piacentini, F, Piat, M, Pierpaoli, E, Piffaretti, R, Plaszczynski, S, Pointecouteau, E, Polenta, G, Ponthieu, N, Poutanen, T, Pratt, GW, Prézeau, G, Prunet, S, Puget, J-L, Rebolo, R, Reinecke, M, Renault, C, Ricciardi, S, Riller, T, Ristorcelli, I, Rocha, G, Rosset, C, Rubiño-Martín, JA, Rusholme, B, Saar, E, Sandri, M, Santos, D, Schaefer, BM, Scott, D, Seiffert, MD, Smoot, GF, Starck, J-L, Stivoli, F, Stolyarov, V, Sunyaev, R, Sygnet, J-F, Tauber, JA, Terenzi, L, Toffolatti, L, Tomasi, M, Torre, J-P, Tristram, M, Tuovinen, J, Valenziano, L, Vibert, L, Vielva, P, Villa, F, Vittorio, N, Wandelt, BD, White, SDM, Yvon, D, Zacchei, A & Zonca, A 2011, 'Planck early results. IX. XMM-Newton follow-up for validation of Planck cluster candidates', Astronomy & Astrophysics, vol. 536, A9. https://doi.org/10.1051/0004-6361/201116460

TY - JOUR

T1 - Planck early results. IX. XMM-Newton follow-up for validation of Planck cluster candidates

AU - Planck Collaboration, [No Value]

AU - Aghanim, N.

AU - Arnaud, M.

AU - Ashdown, M.

AU - Aumont, J.

AU - Baccigalupi, C.

AU - Balbi, A.

AU - Banday, A. J.

AU - Barreiro, R. B.

AU - Bartelmann, M.

AU - Bartlett, J. G.

AU - Battaner, E.

AU - Benabed, K.

AU - Benoît, A.

AU - Bernard, J.-P.

AU - Bersanelli, M.

AU - Bhatia, R.

AU - Bock, J. J.

AU - Bonaldi, A.

AU - Bond, J. R.

AU - Borrill, J.

AU - Bouchet, F. R.

AU - Brown, M. L.

AU - Bucher, M.

AU - Burigana, C.

AU - Cabella, P.

AU - Cantalupo, C. M.

AU - Cardoso, J.-F.

AU - Carvalho, P.

AU - Catalano, A.

AU - Cayón, L.

AU - Challinor, A.

AU - Chamballu, A.

AU - Chiang, L.-Y.

AU - Chon, G.

AU - Christensen, P. R.

AU - Churazov, E.

AU - Clements, D. L.

AU - Colafrancesco, S.

AU - Colombi, S.

AU - Couchot, F.

AU - Coulais, A.

AU - Crill, B. P.

AU - Cuttaia, F.

AU - da Silva, A.

AU - Dahle, H.

AU - Danese, L.

AU - de Bernardis, P.

AU - de Gasperis, G.

AU - de Rosa, A.

AU - de Zotti, G.

AU - Delabrouille, J.

AU - Delouis, J.-M.

AU - Désert, F.-X.

AU - Diego, J. M.

AU - Dolag, K.

AU - Donzelli, S.

AU - Doré, O.

AU - Dörl, U.

AU - Douspis, M.

AU - Dupac, X.

AU - Efstathiou, G.

AU - Enßlin, T. A.

AU - Finelli, F.

AU - Flores-Cacho, I.

AU - Forni, O.

AU - Frailis, M.

AU - Franceschi, E.

AU - Fromenteau, S.

AU - Galeotta, S.

AU - Ganga, K.

AU - Génova-Santos, R. T.

AU - Giard, M.

AU - Giardino, G.

AU - Giraud-Héraud, Y.

AU - González-Nuevo, J.

AU - González-Riestra, R.

AU - Górski, K. M.

AU - Gratton, S.

AU - Gregorio, A.

AU - Gruppuso, A.

AU - Harrison, D.

AU - Heinämäki, P.

AU - Henrot-Versillé, S.

AU - Hernández-Monteagudo, C.

AU - Herranz, D.

AU - Hildebrandt, S. R.

AU - Hivon, E.

AU - Hobson, M.

AU - Holmes, W. A.

AU - Hovest, W.

AU - Hoyland, R. J.

AU - Huffenberger, K. M.

AU - Hurier, G.

AU - Jaffe, A. H.

AU - Juvela, M.

AU - Keihänen, E.

AU - Keskitalo, R.

AU - Kisner, T. S.

AU - Kneissl, R.

AU - Knox, L.

AU - Kurki-Suonio, H.

AU - Lagache, G.

AU - Lamarre, J.-M.

AU - Lasenby, A.

AU - Laureijs, R. J.

AU - Lawrence, C. R.

AU - Le Jeune, M.

AU - Leach, S.

AU - Leonardi, R.

AU - Liddle, A.

AU - Linden-Vørnle, M.

AU - López-Caniego, M.

AU - Lubin, P. M.

AU - Macías-Pérez, J. F.

AU - Maffei, B.

AU - Maino, D.

AU - Mandolesi, N.

AU - Mann, R.

AU - Maris, M.

AU - Marleau, F.

AU - Martínez-González, E.

AU - Masi, S.

AU - Matarrese, S.

AU - Matthai, F.

AU - Mazzotta, P.

AU - Melchiorri, A.

AU - Melin, J.-B.

AU - Mendes, L.

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PY - 2011/12/1

Y1 - 2011/12/1

N2 - We present the XMM-Newton follow-up for confirmation of Planck cluster candidates. Twenty-five candidates have been observed to date using snapshot (~10ks) exposures, ten as part of a pilot programme to sample a low range of signal-to-noise ratios (4 <S/N <6), and a further 15 in a programme to observe a sample of S/N > 5 candidates. The sensitivity and spatial resolution of XMM-Newton allows unambiguous discrimination between clusters and false candidates. The 4 false candidates have S/N ≤ 4.1. A total of 21 candidates are confirmed as extended X-ray sources. Seventeen are single clusters, the majority of which are found to have highly irregular and disturbed morphologies (about ~70%). The remaining four sources are multiple systems, including the unexpected discovery of a supercluster at z = 0.45. For 20 sources we are able to derive a redshift estimate from the X-ray Fe K line (albeit of variable quality). The new clusters span the redshift range 0.09 ≲ z ≲ 0.54, with a median redshift of z ~ 0.37. A first determination is made of their X-ray properties including the characteristic size, which is used to improve the estimate of the SZ Compton parameter, Y500. The follow-up validation programme has helped to optimise the Planck candidate selection process. It has also provided a preview of the X-ray properties of these newly-discovered clusters, allowing comparison with their SZ properties, and to the X-ray and SZ properties of known clusters observed in the Planck survey. Our results suggest that Planck may have started to reveal a non-negligible population of massive dynamically perturbed objects that is under-represented in X-ray surveys. However, despite their particular properties, these new clusters appear to follow the Y500-YX relation established for X-ray selected objects, where YX is the product of the gas mass and temperature. Corresponding author: E. Pointecouteau, e-mail: [email protected]

AB - We present the XMM-Newton follow-up for confirmation of Planck cluster candidates. Twenty-five candidates have been observed to date using snapshot (~10ks) exposures, ten as part of a pilot programme to sample a low range of signal-to-noise ratios (4 <S/N <6), and a further 15 in a programme to observe a sample of S/N > 5 candidates. The sensitivity and spatial resolution of XMM-Newton allows unambiguous discrimination between clusters and false candidates. The 4 false candidates have S/N ≤ 4.1. A total of 21 candidates are confirmed as extended X-ray sources. Seventeen are single clusters, the majority of which are found to have highly irregular and disturbed morphologies (about ~70%). The remaining four sources are multiple systems, including the unexpected discovery of a supercluster at z = 0.45. For 20 sources we are able to derive a redshift estimate from the X-ray Fe K line (albeit of variable quality). The new clusters span the redshift range 0.09 ≲ z ≲ 0.54, with a median redshift of z ~ 0.37. A first determination is made of their X-ray properties including the characteristic size, which is used to improve the estimate of the SZ Compton parameter, Y500. The follow-up validation programme has helped to optimise the Planck candidate selection process. It has also provided a preview of the X-ray properties of these newly-discovered clusters, allowing comparison with their SZ properties, and to the X-ray and SZ properties of known clusters observed in the Planck survey. Our results suggest that Planck may have started to reveal a non-negligible population of massive dynamically perturbed objects that is under-represented in X-ray surveys. However, despite their particular properties, these new clusters appear to follow the Y500-YX relation established for X-ray selected objects, where YX is the product of the gas mass and temperature. Corresponding author: E. Pointecouteau, e-mail: [email protected]

UR - http://www.scopus.com/inward/record.url?scp=82955241481&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201116460

DO - 10.1051/0004-6361/201116460

M3 - Article

SN - 0004-6361

VL - 536

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - A9

ER -

Planck early results. IX. XMM-Newton follow-up for validation of Planck cluster candidates

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