赫歇尔对子弹星系团中遮蔽恒星形成的深度观测
宇宙学与河外天体物理
2015-05-19 v1
摘要
我们利用赫歇尔透镜巡天(HLS)的深五波段(100-500微米)数据,完全约束了子弹星系团(z=0.296)以及同一视场中一个更小的背景系统(z=0.35)内星系的遮蔽恒星形成率SFR_FIR。赫歇尔探测到23个子弹星系团成员,总SFR_FIR = 144 ± 14 M_sun yr^-1。平均而言,背景系统包含更亮的远红外(FIR)星系,其SFR_FIR高出约50%(21个星系;207 ± 9 M_sun yr^-1)。通过近期模板从24微米流量外推的SFR(SFR_24)与约60%的团星系的SFR_FIR吻合良好。在剩余的约40%中,由于观测到的S_100/S_24(静止系S_75/S_18)相比相同FIR光度的模板存在显著过量,SFR_24低估了SFR_FIR。
引用
@article{arxiv.1005.3822,
title = {Deep Herschel view of obscured star formation in the Bullet cluster},
author = {T. D. Rawle and S. M. Chung and D. Fadda and M. Rex and E. Egami and P. G. Pérez-González and B. Altieri and A. W. Blain and C. R. Bridge and A. K. Fiedler and A. H. Gonzalez and M. J. Pereira and J. Richard and I. Smail and I. Valtchanov and M. Zemcov and P. N. Appleton and J. J. Bock and F. Boone and B. Clement and F. Combes and C. D. Dowell and M. Dessauges-Zavadsky and O. Ilbert and R. J. Ivison and M. Jauzac and J. -P. Kneib and D. Lutz and R. Pelló and G. H. Rieke and G. Rodighiero and D. Schaerer and G. P. Smith and G. L. Walth and P. van der Werf and M. W. Werner},
journal= {arXiv preprint arXiv:1005.3822},
year = {2015}
}
备注
Accepted for publication in Astronomy and Astrophysics (Herschel Special Issue)