arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0909.5367astro-ph.CO
收藏

在350微米处选择的第一个星系的性质

On the nature of the first galaxies selected at 350 microns

Sophia A. Khan, Pierre F. Chanial, S. P. Willner, Chris P. Pearson, M. L. N. Ashby, Dominic J. Benford, David L. Clements, Simon Dye, Duncan Farrah, G. G. Fazio… 展开作者

Sophia A. Khan, Pierre F. Chanial, S. P. Willner, Chris P. Pearson, M. L. N. Ashby, Dominic J. Benford, David L. Clements, Simon Dye, Duncan Farrah, G. G. Fazio, J. -S. Huang, V. Lebouteiller, Emeric Le Floc'h, Gabriele Mainetti, S. Harvey Moseley, Mattia Negrello, Stephen Serjeant, Richard A. Shafer, Johannes Staguhn, Timothy J. Sumner, Mattia Vaccari

摘要:

我们提出了对第一个星系的性质的限制,选择在350微米。样本包括在350微米的最深空白场调查中发现的星系(在Bootes Deep Field),以及后来在Lockman Hole偶然发现的星系。光谱能量分布模板适合于识别的对应物,并且发现样本包括主要由恒星形成提供动力的1<z<3的红外发光星系。350微米选定星系的第一个光谱提供了额外的确认,显示出典型的与恒星形成星系相关的突出尘埃颗粒特征。与在850和1100微米处选择的亚毫米星系相比,在350微米处选择的星系具有类似的远红外色温范围。然而,在850或1100微米处没有可靠地检测到350微米选定的源。在我们的样本中,红移为1<z<2的星系显示出远红外和中红外通量密度之间的紧密相关性,但是在更高红移的星系中,它们的中远红外颜色显示出很大的色散。350微米的通量密度(15<S(350)<40 mJy)使这些天体接近赫歇尔/SPIRE 350微米的混淆阈值,恒星形成率密度的下限表明350微米的贡献大部分来自较低亮度的红外源和正常星系。

英文摘要:

[abridged] We present constraints on the nature of the first galaxies selected at 350 microns. The sample includes galaxies discovered in the deepest blank-field survey at 350 microns (in the Bootes Deep Field) and also later serendipitous detections in the Lockman Hole. Spectral energy distribution templates are fit to identified counterparts, and the sample is found to comprise IR-luminous galaxies at 1<z<3 predominantly powered by star formation. The first spectrum of a 350-micron-selected galaxy provides an additional confirmation, showing prominent dust grain features typically associated with star-forming galaxies. Compared to submillimeter galaxies selected at 850 and 1100 microns, galaxies selected at 350 microns have a similar range of far-infrared color temperatures. However, no 350-micron-selected sources are reliably detected at 850 or 1100 microns. Galaxies in our sample with redshifts 1<z<2 show a tight correlation between the far- and mid-infrared flux densities, but galaxies at higher redshifts show a large dispersion in their mid- to far-infrared colors. The 350-micron flux densities (15<S(350)<40 mJy) place these objects near the Herschel/SPIRE 350-micron confusion threshold, with the lower limit on the star formation rate density suggesting the bulk of the 350-micron contribution will come from less luminous infrared sources and normal galaxies.

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。

↑