Herschel观测下星系宇宙学时间演化中的尘埃温度演化
宇宙学与河外天体物理
2015-05-19 v1
摘要
我们研究了作为 PEP 和 HerMES 关键项目一部分、由赫歇尔空间天文台在大天文台起源深度巡天北天区观测到的红移范围 0.1<z<2.8 内星系的尘埃性质。星系的红外（IR）光度（L_IR）和尘埃温度（T_dust）是通过对赫歇尔上搭载的 PACS 和 SPIRE 仪器获得的远红外（FIR）流量密度进行光谱能量分布（SED）拟合推导出来的。作为参考样本，我们还利用斯隆数字巡天天区中的 AKARI 和 IRAS 数据，获得了 z<0.1 处局部星系的红外光度和尘埃温度。我们比较了两个样本间的 L_IR-T_dust 关系，发现：在 z>0.5 且 L_IR>5x10^{10} L_\odot 的赫歇尔选源星系中，其中位 T_dust 似乎比具有相似光度的 AKARI 选源局部星系冷 2-5 K；并且由于存在局部星系中未见的冷星系，高红移星系的 T_dust 离散度随 L_IR 的增加而增大。我们表明，L_IR-T_dust 关系的这种大离散度可以弥合局部恒星形成星系与高红移亚毫米星系（SMGs）之间的差距。我们还发现，本研究涵盖的3个具有极低 T_dust（<20 K）的 SMG 具有相近亮度的 24-\mum 邻近源，这可能导致对这些 SMG 的 FIR/（亚）毫米流量估值过高。
引用
@article{arxiv.1009.1058,
title = {Evolution of Dust Temperature of Galaxies through Cosmic Time as seen by Herschel},
author = {H. S. Hwang and D. Elbaz and G. E. Magdis and E. Daddi and M. Symeonidis and B. Altieri and A. Amblard and P. Andreani and V. Arumugam and R. Auld and H. Aussel and T. Babbedge and S. Berta and A. Blain and J. Bock and A. Bongiovanni and A. Boselli and V. Buat and D. Burgarella and N. Castro-Rodriguez and A. Cava and J. Cepa and P. Chanial and E. Chapin and R. -R. Chary and A. Cimatti and D. L. Clements and A. Conley and L. Conversi and A. Cooray and H. Dannerbauer and M. Dickinson and H. Dominguez and C. D. Dowell and J. S. Dunlop and E. Dwek and S. Eales and D. Farrah and N. Forster Schreiber and M. Fox and A. Franceschini and W. Gear and R. Genzel and J. Glenn and M. Griffin and C. Gruppioni and M. Halpern and E. Hatziminaoglou and E. Ibar and K. Isaak and R. J. Ivison and W. -S. Jeong and G. Lagache and D. Le Borgne and E. Le Floc'h and H. M. Lee and J. C. Lee and M. G. Lee and L. Levenson and N. Lu and D. Lutz and S. Madden and B. Maffei and B. Magnelli and G. Mainetti and R. Maiolino and L. Marchetti and A. M. J. Mortier and H. T. Nguyen and R. Nordon and B. O'Halloran and K. Okumura and S. J. Oliver and A. Omont and M. J. Page and P. Panuzzo and A. Papageorgiou and C. P. Pearson and I. Perez-Fournon and A. M. Perez Garcia and A. Poglitsch and M. Pohlen and P. Popesso and F. Pozzi and J. I. Rawlings and D. Rigopoulou and L. Riguccini and D. Rizzo and G. Rodighiero and I. G. Roseboom and M. Rowan-Robinson and A. Saintonge and M. Sanchez Portal and P. Santini and M. Sauvage and B. Schulz and Douglas Scott and N. Seymour and L. Shao and D. L. Shupe and A. J. Smith and J. A. Stevens and E. Sturm and L. Tacconi and M. Trichas and K. E. Tugwell and M. Vaccari and I. Valtchanov and J. D. Vieira and L. Vigroux and L. Wang and R. Ward and G. Wright and C. K. Xu and M. Zemcov},
journal= {arXiv preprint arXiv:1009.1058},
year = {2015}
}
备注
9 pages, 6 figures, To appear in MNRAS