Planck 中期结果 V：基于 Sunyaev-Zeldovich 效应的星系团压强分布
宇宙学与河外天体物理
2015-06-05 v2
摘要
利用 Planck 卫星的全天覆盖和宽频带优势，我们研究了在 14 个月名义巡天中以高显著性探测到的 62 个邻近大质量星系团的 Sunyaev-Zeldovich (SZ) 效应及其压强分布。对 SZ 信号的仔细重构表明，大多数星系团至少在 R500 范围内被单独探测到。通过叠加径向分布，我们在统计上探测到了延伸至 3 x R500 的径向 SZ 信号，即在密度反差约为 50-100 处，尽管在整个径向范围内，均值分布的离散度主导了统计误差。我们的测量结果与此前 Planck 关于积分 SZ 流量的结果完全一致，进一步加强了 R500 内部 SZ 测量与 X 射线测量之间的一致性。修正 Planck 波束效应后，我们计算了相应的压强分布。这一来自 SZ 测量的新约束在分布重叠区域（即 [0.1-1]R500）与 XMM-Newton 的 X 射线约束一致，并且在预期离散度内与理论预测相当吻合。在更大半径处，平均压强分布比大多数数值模拟的预测略平坦。将观测到的 SZ 和 X 射线分布结合，对广义压强分布进行联合拟合，得到最佳拟合参数 [P0, c500, gamma, alpha, beta] = [6.41, 1.81, 0.31, 1.33, 4.13]。利用关于星系团外围气体温度的合理假设，我们从叠加的压强分布重构了延伸至 3 x R500 的气体质量分数分布。在温度驱动的不确定度范围内，我们的 Planck 约束与宇宙重子分数及晕中预期气体分数相容。
引用
@article{arxiv.1207.4061,
title = {Planck Intermediate Results. V. Pressure profiles of galaxy clusters from the Sunyaev-Zeldovich effect},
author = {Planck Collaboration and P. A. R. Ade and N. Aghanim and M. Arnaud and M. Ashdown and F. Atrio-Barandela and J. Aumont and C. Baccigalupi and A. Balbi and A. J. Banday and R. B. Barreiro and J. G. Bartlett and E. Battaner and K. Benabed and A. Benoit and J. -P. Bernard and M. Bersanelli and R. Bhatia and I. Bikmaev and H. Boehringer and A. Bonaldi and J. R. Bond and S. Borgani and J. Borrill and F. R. Bouchet and H. Bourdin and M. L. Brown and R. Burenin and C. Burigana and P. Cabella and J. -F. Cardoso and P. Carvalho and G. Castex and A. Catalano and L. Cayon and A. Chamballu and L. -Y Chiang and G. Chon and P. R. Christensen and E. Churazov and D. L. Clements and S. Colafrancesco and S. Colombi and L. P. L. Colombo and B. Comis and A. Coulais and B. P. Crill and F. Cuttaia and A. Da Silva and H. Dahle and L. Danese and R. J. Davis and P. de Bernardis and G. de Gasperis and G. de Zotti and J. Delabrouille and J. Democles and F. -X. Desert and J. M. Diego and K. Dolag and H. Dole and S. Donzelli and O. Dore and U. Dorl and M. Douspis and X. Dupac and G. Efstathiou and T. A. Ensslin and H. K. Eriksen and F. Finelli and I. Flores-Cacho and O. Forni and P. Fosalba and M. Frailis and E. Franceschi and M. Frommert and S. Galeotta and K. Ganga and R. T. Genova-Santos and M. Giard and Y. Giraud-Heraud and J. Gonzalez-Nuevo and K. M. Gorski and A. Gregorio and A. Gruppuso and F. K. Hansen and D. Harrison and A. Hempel and S. Henrot-Versille and C. Hernandez-Monteagudo and D. Herranz and S. R. Hildebrandt and E. Hivon and M. Hobson and W. A. Holmes and G. Hurier and T. R. Jaffe and A. H. Jaffe and T. Jagemann and W. C. Jones and M. Juvela and E. Keihanen and I. Khamitov and T. S. Kisner and R. Kneissl and J. Knoche and L. Knox and M. Kunz and H. Kurki-Suonio and G. Lagache and A. Lahteenmaki and J. -M. Lamarre and A. Lasenby and C. R. Lawrence and M. Le Jeune and R. Leonardi and A. Liddle and P. B. Lilje and M. Lopez-Caniego and G. Luzzi and J. F. Macias-Perez and D. Maino and N. Mandolesi and M. Maris and F. Marleau and D. J. Marshall and E. Martinez-Gonzalez and S. Masi and M. Massardi and S. Matarrese and P. Mazzotta and S. Mei and A. Melchiorri and J. -B. Melin and L. Mendes and A. Mennella and S. Mitra and M. -A. Miville-Deschaines and A. Moneti and L. Montier and G. Morgante and D. Mortlock and D. Munshi and J. A. Murphy and P. Naselsky and F. Nati and P. Natoli and H. U. Norgaard-Nielsen and F. Noviello and D. Novikov and I. Novikov and S. Osborne and F. Pajot and D. Paoletti 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 L. Popa and T. Poutanen and G. W. Pratt and S. Prunet and J. -L. Puget and J. P. Rachen and W. T. Reach and R. Rebolo and M. Reinecke and M. Remazeilles and C. Renault and S. Ricciardi and T. Riller and I. Ristorcelli and G. Rocha and M. Roman and C. Rosset and M. Rossetti and J. A. Rubino-Martin and B. Rusholme and M. Sandri and G. Savini and D. Scott and G. F. Smoot and J. -L. Starck and R. Sudiwala and R. Sunyaev and D. Sutton and A. -S. Suur-Uski and J. -F. Sygnet and J. A. Tauber and L. Terenzi and L. Toffolatti and M. Tomasi and M. Tristram and J. Tuovinen and L. Valenziano and B. Van Tent and J. Varis and P. Vielva and F. Villa and N. Vittorio and L. A. Wade and B. D. Wandelt and N. Welikala and S. D. M. White and M. White and D. Yvon and A. Zacchei and A. Zonca},
journal= {arXiv preprint arXiv:1207.4061},
year = {2015}
}
备注
24 pages, 15 figures, accepted for publication in A&A