Euclid：早期释放观测——Abell 2390 超越其virial半径的联合强弱引力解
宇宙学与河外天体物理
2026-02-04 v1
摘要
Euclid 正在通过弱引力（WL）信号对数十亿颗遥远星系的物质分布进行详细测绘。WL 信号在星系团附近最为显著，可延伸至距离其virial半径之外，从而约束其总质量。星系团中心附近，成员星系的污染是一个问题，WL 数据可通过强引力（SL）数据补充，这不仅能减少因质量-薄膜歧义导致的不确定性，还能提供关于星系团中心物质分布的高分辨率信息。本文呈现对 Euclid 早期释放观测中星系团 Abell 2390（z=0.228）的联合 SL 和 WL 分析。凭借 Euclid 广阔的视场（0.5 deg）以及可见光波段的角分辨率为 0"。13 和每像素的采样为 0"。1， 我们在 30 kpc < r < 2000 kpc 的广泛半径范围内约束了密度轮廓，从最亮星系团星系（BCG）附近的内侧到星系团的virial 半径之外。我们发现结果与基于水平平衡假设的早期 X 射线结果一致，从而间接确认了该星系团近似处于放松状态。我们也与基于弱引力数据和地面观测的先前结果保持一致。从联合 SL+WL 轮廓中，我们推导出 virial 质量 ，以及virial 半径 ，其中误差范围代表一个标准偏差。该轮廓可由浓度为 c=6.5、小比例尺半径为 230 kpc 的 NFW 模型很好地描述，在 30\,kpc < r < 2000\,kpc 的范围内，由 SL 和 WL 数据最好地约束。Abell 2390 是众多示例中 Euclid 数据将在提供星系团质量方面发挥关键作用的第一个案例。
关键词
引用
@article{arxiv.2507.08545,
title = {Euclid: Early Release Observations. A combined strong and weak lensing solution for Abell 2390 beyond its virial radius},
author = {J. M. Diego and G. Congedo and R. Gavazzi and T. Schrabback and H. Atek and B. Jain and J. R. Weaver and Y. Kang and W. G. Hartley and G. Mahler and N. Okabe and J. B. Golden-Marx and M. Meneghetti and J. M. Palencia and M. Kluge and R. Laureijs and T. Saifollahi and M. Schirmer and C. Stone and M. Jauzac and D. Scott and B. Altieri and A. Amara and S. Andreon and N. Auricchio and C. Baccigalupi and M. Baldi and S. Bardelli and P. Battaglia and A. Biviano and E. Branchini and M. Brescia and J. Brinchmann and S. Camera and G. Cañas-Herrera and G. P. Candini and V. Capobianco and C. Carbone and V. F. Cardone and J. Carretero and S. Casas and M. Castellano and G. Castignani and S. Cavuoti and K. C. Chambers and A. Cimatti and C. Colodro-Conde and C. J. Conselice and L. Conversi and Y. Copin and F. Courbin and H. M. Courtois and M. Cropper and J. -C. Cuillandre and A. Da Silva and H. Degaudenzi and G. De Lucia and H. Dole and M. Douspis and F. Dubath and X. Dupac and S. Dusini and S. Escoffier and M. Farina and S. Farrens and F. Faustini and S. Ferriol and F. Finelli and P. Fosalba and N. Fourmanoit and M. Frailis and E. Franceschi and M. Fumana and S. Galeotta and K. George and B. Gillis and C. Giocoli and J. Gracia-Carpio and A. Grazian and F. Grupp and L. Guzzo and S. V. H. Haugan and J. Hoar and W. Holmes and I. M. Hook and F. Hormuth and A. Hornstrup and P. Hudelot and K. Jahnke and M. Jhabvala and B. Joachimi and E. Keihänen and S. Kermiche and M. Kilbinger and B. Kubik and K. Kuijken and M. Kümmel and M. Kunz and H. Kurki-Suonio and A. M. C. Le Brun and D. Le Mignant and S. Ligori and P. B. Lilje and V. Lindholm and I. Lloro and G. Mainetti and D. Maino and E. Maiorano and O. Mansutti and O. Marggraf and M. Martinelli and N. Martinet and F. Marulli and R. J. Massey and E. Medinaceli and S. Mei and M. Melchior and Y. Mellier and E. Merlin and G. Meylan and J. J. Mohr and A. Mora and M. Moresco and L. Moscardini and E. Munari and R. Nakajima and C. Neissner and R. C. Nichol and S. -M. Niemi and C. Padilla and S. Paltani and F. Pasian and K. Pedersen and W. J. Percival and V. Pettorino and S. Pires and G. Polenta and M. Poncet and L. A. Popa and L. Pozzetti and F. Raison and A. Renzi and J. Rhodes and G. Riccio and E. Romelli and M. Roncarelli and R. Saglia and Z. Sakr and D. Sapone and B. Sartoris and P. Schneider and A. Secroun and G. Seidel and M. Seiffert and S. Serrano and P. Simon and C. Sirignano and G. Sirri and L. Stanco and J. Steinwagner and P. Tallada-Crespí and A. N. Taylor and I. Tereno and N. Tessore and S. Toft and R. Toledo-Moreo and F. Torradeflot and I. Tutusaus and L. Valenziano and J. Valiviita and T. Vassallo and G. Verdoes Kleijn and A. Veropalumbo and Y. Wang and J. Weller and G. Zamorani and F. M. Zerbi and E. Zucca and M. Bolzonella and C. Burigana and L. Gabarra and J. Martín-Fleitas and S. Matthew and V. Scottez and M. Sereno and M. Viel},
journal= {arXiv preprint arXiv:2507.08545},
year = {2026}
}
备注
13 pages, 8 figures