arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1301.4496astro-ph.CO
收藏

Herschel源的全色谱能量分布

Panchromatic spectral energy distributions of Herschel sources

S. Berta, D. Lutz, P. Santini, S. Wuyts, D. Rosario, D. Brisbin, A. Cooray, A. Franceschini, C. Gruppioni, E. Hatziminaoglou, H. S. Hwang, E. Le Floc'h, B. Magn… 展开作者

S. Berta, D. Lutz, P. Santini, S. Wuyts, D. Rosario, D. Brisbin, A. Cooray, A. Franceschini, C. Gruppioni, E. Hatziminaoglou, H. S. Hwang, E. Le Floc'h, B. Magnelli, R. Nordon, S. Oliver, M. J. Page, P. Popesso, L. Pozzetti, F. Pozzi, L. Riguccini, G. Rodighiero, I. Roseboom, Douglas Scott, M. Symeonidis, I. Valtchanov, M. Viero, L. Wang

摘要:

PEP和HerMES计划的远红外赫歇尔测光与GOODS-N、GOODS-S和COSMOS领域的辅助数据集相结合。基于这一丰富的数据集,我们再现了restframe UV FIR十色分布的星系使用多变量高斯模式的叠加。每个模式的中位数SED,然后安装与修改后的版本的MAGPHYS代码,结合恒星光,从恒星加热的尘埃和一个可能的温暖的尘埃贡献加热AGN的排放。定义的高斯分组也用于识别稀有源。异常星系的生态学包括赫歇尔探测到的椭圆星系、非常蓝的z~1 Ly-break星系、静止的螺旋星系和有恒星形成的环形活动星系核。在这些群体和离群值,一个新的模板库组装,由32个SED描述的内在散射在restframe紫外到submm颜色的红外星系。这个库进行测试,对L(IR)估计与赫歇尔数据包括在内,并比较其他八个流行的方法,经常在文献中采用。当实施赫歇尔光度测定法时,这些方法产生在10- 20%的中值绝对偏差内彼此一致的L(IR)值,散射更多地由代码的微调而不是由SED模板的选择主导。最后,该库被用来分类PEP GOODS领域的24微米检测源。活动星系核似乎分布在恒星质量(M*)与恒星形成率(SFR)的空间中,与所有其他星系一样,无论它们提供的红外光度如何,都倾向于位于“主序星”的高SFR一侧。对于具有较高比恒星形成率(sSFR)的天体,较温暖的恒星形成源的发生率会增加,并且它们倾向于填充M*-SFR-z空间的“非序列”区域。

英文摘要:

(abridged) Far-infrared Herschel photometry from the PEP and HerMES programs is combined with ancillary datasets in the GOODS-N, GOODS-S, and COSMOS fields. Based on this rich dataset, we reproduce the restframe UV to FIR ten-colors distribution of galaxies using a superposition of multi-variate Gaussian modes. The median SED of each mode is then fitted with a modified version of the MAGPHYS code that combines stellar light, emission from dust heated by stars and a possible warm dust contribution heated by an AGN. The defined Gaussian grouping is also used to identify rare sources. The zoology of outliers includes Herschel-detected ellipticals, very blue z~1 Ly-break galaxies, quiescent spirals, and torus-dominated AGN with star formation. Out of these groups and outliers, a new template library is assembled, consisting of 32 SEDs describing the intrinsic scatter in the restframe UV-to-submm colors of infrared galaxies. This library is tested against L(IR) estimates with and without Herschel data included, and compared to eight other popular methods often adopted in the literature. When implementing Herschel photometry, these approaches produce L(IR) values consistent with each other within a median absolute deviation of 10-20%, the scatter being dominated more by fine tuning of the codes, rather than by the choice of SED templates. Finally, the library is used to classify 24 micron detected sources in PEP GOODS fields. AGN appear to be distributed in the stellar mass (M*) vs. star formation rate (SFR) space along with all other galaxies, regardless of the amount of infrared luminosity they are powering, with the tendency to lie on the high SFR side of the "main sequence". The incidence of warmer star-forming sources grows for objects with higher specific star formation rates (sSFR), and they tend to populate the "off-sequence" region of the M*-SFR-z space.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑