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arXiv 1208.3079astro-ph.CO
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Herschel-ATLAS:z < 0.5时250微米选定星系的多波长SED和物理性质

Herschel-ATLAS: Multi-wavelength SEDs and physical properties of 250 micron-selected galaxies at z < 0.5

D. J. B. Smith, L. Dunne, E. da Cunha, K. Rowlands, S. J. Maddox, H. L. Gomez, D. G. Bonfield, S. Charlot, S. P. Driver, C. C. Popescu, R. J. Tuffs, J. S. Dunlo… 展开作者

D. J. B. Smith, L. Dunne, E. da Cunha, K. Rowlands, S. J. Maddox, H. L. Gomez, D. G. Bonfield, S. Charlot, S. P. Driver, C. C. Popescu, R. J. Tuffs, J. S. Dunlop, M. J. Jarvis, N. Seymour, M. Symeonidis, M. Baes, N. Bourne, D. L. Clements, A. Cooray, G. De Zotti, S. Dye, S. Eales, D. Scott, A. Verma, P. van der Werf, E. Andrae, R. Auld, S. Buttiglione, A. Cava, A. Dariush, J. Fritz, R. Hopwood, E. Ibar, R. J. Ivison, L. Kelvin, B. F. Madore, M. Pohlen, E. E. Rigby, A. Robotham, M. Seibert, P. Temi

摘要:

我们提出了一个前所未有的样本1402 250微米选定的星系z < 0.5(平均z = 0.24)从赫歇尔-ATLAS调查的全色分析。我们补充我们的赫歇尔100-500微米的数据与紫外-K-波段光度从星系和质量大会(GAMA)的调查和应用的MAGPHYS能量平衡技术,以产生全色SED的代表性样本的250微米选定的星系跨越最近的5 Gyr的宇宙历史。我们得到的物理参数,包括恒星形成率,恒星质量,尘埃质量和红外光度的估计。z < 0.5的典型H-ATLAS星系的远红外光度范围为10^10 - 10^12 Lsolar(SFR:1-50 Msolar/yr),因此在这个红移范围内,它广泛地代表了正常的恒星形成星系。我们发现,250微米选定的星系包含一个更大的质量的尘埃在给定的红外光度或恒星形成率比以前的样品选择在60微米从IRAS。我们推导了H-ATLAS星系的典型SED,并表明出射SED形状对特定的恒星形成率最为敏感。在较高的红移下,由于尘埃的存在,光学紫外SED也变得更红。我们的模板SED比现有的红外模板要酷得多。因此,他们可能是最合适的推断总红外光度从中等红移亚毫米选定的样本和列入模型的较低的红移亚毫米星系人口。

英文摘要:

We present a pan-chromatic analysis of an unprecedented sample of 1402 250 micron-selected galaxies at z < 0.5 (mean z = 0.24) from the Herschel-ATLAS survey. We complement our Herschel 100-500 micron data with UV-K-band photometry from the Galaxy And Mass Assembly (GAMA) survey and apply the MAGPHYS energy-balance technique to produce pan-chromatic SEDs for a representative sample of 250 micron selected galaxies spanning the most recent 5 Gyr of cosmic history. We derive estimates of physical parameters, including star formation rates, stellar masses, dust masses and infrared luminosities. The typical H-ATLAS galaxy at z < 0.5 has a far-infrared luminosity in the range 10^10 - 10^12 Lsolar (SFR: 1-50 Msolar/yr) thus is broadly representative of normal star forming galaxies over this redshift range. We show that 250 micron-selected galaxies contain a larger mass of dust at a given infra-red luminosity or star formation rate than previous samples selected at 60 micron from IRAS. We derive typical SEDs for H-ATLAS galaxies, and show that the emergent SED shape is most sensitive to specific star formation rate. The optical-UV SEDs also become more reddened due to dust at higher redshifts. Our template SEDs are significantly cooler than existing infra-red templates. They may therefore be most appropriate for inferring total IR luminosities from moderate redshift submillimetre selected samples and for inclusion in models of the lower redshift submillimetre galaxy populations.

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