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arXiv 1409.5136astro-ph.GA
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洛克曼洞中赫歇尔源大样本的详细模拟:通过它们的异常SED识别冷尘埃和透镜候选者

Detailed modelling of a large sample of Herschel sources in the Lockman Hole: identification of cold dust and of lensing candidates through their anomalous SEDs

Michael Rowan-Robinson, Lingyu Wang, Julie Wardlow, Duncan Farrah, Seb Oliver, Jamie Bock, Charlotte Clarke, David Clements, Edo Ibar, Eduardo Gonzalez-Solares,… 展开作者

Michael Rowan-Robinson, Lingyu Wang, Julie Wardlow, Duncan Farrah, Seb Oliver, Jamie Bock, Charlotte Clarke, David Clements, Edo Ibar, Eduardo Gonzalez-Solares, Lucia Marchetti, Douglas Scott, Anthony Smith, Mattia Vaccari, Ivan Valtchanov

摘要:

我们详细研究了967个SPIRE源的样本,这些源在350和500微米处具有5-sigma检测,并与HerMES-Lockman勘测区的Spitzer-SWIRE 24微米星系关联,拟合了它们的中红外和远红外以及亚毫米级的SPD。使用一组六个红外模板进行自动搜索。对于近300个星系,我们已经分别模拟了它们的SED,以确保拟合的物理性。我们确认需要新的凉爽和寒冷的卷云模板,也是年轻的星爆模板,在早期的工作中介绍。我们还确定了109透镜候选人通过他们的异常SED,并提供了一组颜色红移的限制,使透镜候选人被确定从合并赫歇尔和斯皮策数据。出现的亚毫米星系群的图像是复杂的,包括超亮和超亮的星爆,以星际尘埃排放为主的低光度星系,透镜星系和具有令人惊讶的冷(10- 13 K)尘埃的星系。500个$μ$ m选定源中的11%是透镜候选。70%的非透镜源是超亮红外星系,26%是超亮星系。其中34%主要由光学薄的星际尘埃(“卷云”)发射,但其中大部分是由于比我们银河系特征更冷的尘埃。在最高的红外光度下,我们看到M82,Arp 220和年轻的恒星爆发类型占主导地位的SED,比例大致相等。

英文摘要:

We have studied in detail a sample of 967 SPIRE sources with 5-sigma detections at 350 and 500 micron and associations with Spitzer-SWIRE 24 micron galaxies in the HerMES-Lockman survey area, fitting their mid- and far-infrared, and submillimetre, SEDs in an automatic search with a set of six infrared templates. For almost 300 galaxies we have modelled their SEDs individually to ensure the physicality of the fits. We confirm the need for the new cool and cold cirrus templates, and also of the young starburst template, introduced in earlier work. We also identify 109 lensing candidates via their anomalous SEDs and provide a set of colour-redshift constraints which allow lensing candidates to be identified from combined Herschel and Spitzer data. The picture that emerges of the submillimetre galaxy population is complex, comprising ultraluminous and hyperluminous starbursts, lower luminosity galaxies dominated by interstellar dust emission, lensed galaxies and galaxies with surprisingly cold (10-13K) dust. 11 % of 500$μ$m selected sources are lensing candidates. 70 % of the unlensed sources are ultraluminous infrared galaxies and 26 % are hyperluminous. 34 % are dominated by optically thin interstellar dust ('cirrus') emission, but most of these are due to cooler dust than is characteristic of our Galaxy. At the highest infrared luminosities we see SEDs dominated by M82, Arp220 and young starburst types, in roughly equal proportions.

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