Euclid: 早期释放观测——邻近星系的深层解剖
摘要
Euclid准备在本地宇宙中邻近星系的研究方面取得重大进展。这里我们首次展示了作为Euclid早期释放观测一部分的“邻近星系展示”中观测到的6个星系，这些观测于2023年8月至11月间获取。这些目标包括3个矮星系（Holmberg II, IC10, NGC6822）和3个旋涡星系（IC342, NGC2403, NGC6744），距离范围从约0.5 Mpc到8.8 Mpc。我们对叠加Euclid图像中表面亮度深度的评估确认了先前在100 arcsec^2区域内的估计：VIS为1σ=30.5 mag/arcsec^2，但NISP略深于先前估计，为1σ=29.2-29.4 mag/arcsec^2。通过将Euclid的HE、YE和IE波段组合成RGB图像，我们展示了单个参考观测序列覆盖的大视场，以及这些邻近星系中秒差距尺度上的精致细节。径向表面亮度和颜色分布展示了与恒星族群合成模型一致的星系颜色。标准恒星测光选择技术在6个星系场中发现了约130万颗恒星。Euclid的分辨恒星测光使我们能够通过区分年轻恒星以及渐近巨星支和红巨星支恒星族群的分布，来约束这些星系的恒星形成历史。最后，我们单独检查了2个星系周围的卫星星系系统。我们对NGC6744周围矮卫星星系集合的分析揭示了一个新星系EDwC1，这是一个位于旋臂末端的核矮椭球星系。我们对NGC2403周围球状星团的新普查产生了9个新的星团候选体，其中8个的颜色指示了演化的恒星族群。总之，我们对6个展示星系的调查表明，Euclid是邻近星系解剖学的强大探测器[删节]。
引用
@article{arxiv.2405.13499,
title = {Euclid: Early Release Observations -- Deep anatomy of nearby galaxies},
author = {L. K. Hunt and F. Annibali and J. -C. Cuillandre and A. M. N. Ferguson and P. Jablonka and S. S. Larsen and F. R. Marleau and E. Schinnerer and M. Schirmer and C. Stone and C. Tortora and T. Saifollahi and A. Lançon and M. Bolzonella and S. Gwyn and M. Kluge and R. Laureijs and D. Carollo and M. L. M. Collins and P. Dimauro and P. -A. Duc and D. Erkal and J. M. Howell and C. Nally and E. Saremi and R. Scaramella and V. Belokurov and C. J. Conselice and J. H. Knapen and A. W. McConnachie and I. McDonald and J. Miro Carretero and J. Roman and M. Sauvage and E. Sola and N. Aghanim and B. Altieri and S. Andreon and N. Auricchio and S. Awan and R. Azzollini 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 G. P. Candini 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 L. Corcione and F. Courbin and H. M. Courtois and M. Cropper and A. Da Silva and H. Degaudenzi and A. M. Di Giorgio and J. Dinis and F. Dubath and X. Dupac and S. Dusini 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. Gómez-Alvarez and B. R. Granett and A. Grazian and F. Grupp and L. Guzzo and S. V. H. Haugan and J. Hoar and H. Hoekstra and M. S. Holliman and W. Holmes and I. Hook and F. Hormuth and A. Hornstrup and P. Hudelot and K. Jahnke and E. Keihänen and S. Kermiche and A. Kiessling and M. Kilbinger and T. Kitching and R. Kohley and B. Kubik and K. Kuijken and M. Kümmel and M. Kunz and H. Kurki-Suonio and O. Lahav and D. Le Mignant and P. B. Lilje and V. Lindholm and I. Lloro 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 H. J. McCracken and E. Medinaceli and S. Mei and Y. Mellier and M. Meneghetti and E. Merlin and G. Meylan and M. Moresco and L. Moscardini and E. Munari and R. Nakajima and R. C. Nichol and S. -M. Niemi and J. W. Nightingale 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 G. D. Racca 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 D. Sapone and B. Sartoris and P. Schneider and T. Schrabback and M. Scodeggio and A. Secroun and G. Seidel and S. Serrano and C. Sirignano and G. Sirri and J. Skottfelt and L. Stanco and P. Tallada-Crespí and D. Tavagnacco and A. N. Taylor and H. I. Teplitz and I. Tereno and R. Toledo-Moreo and F. Torradeflot and I. Tutusaus and E. A. Valentijn and L. Valenziano and T. Vassallo and G. Verdoes Kleijn and A. Veropalumbo and Y. Wang and J. Weller and O. R. Williams and G. Zamorani and E. Zucca and C. Burigana and G. De Lucia and K. George and V. Scottez and M. Miluzio and P. Simon and A. Mora and J. Martín-Fleitas and D. Scott},
journal= {arXiv preprint arXiv:2405.13499},
year = {2025}
}
备注
36 pages; 20 figures in main text; 4 Appendices. Submitted to A&A, 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