Evolution of the far-infrared luminosity functions in the Spitzer Wide-area Infrared Extragalactic Legacy Survey

被引:26
作者
Patel, H. [1 ]
Clements, D. L. [1 ]
Vaccari, M. [2 ,3 ]
Mortlock, D. J. [1 ,4 ]
Rowan-Robinson, M. [1 ]
Perez-Fournon, I. [5 ,6 ]
Afonso-Luis, A. [5 ,6 ]
机构
[1] Univ London Imperial Coll Sci Technol & Med, Astrophys Grp, Blackett Lab, London SW7 2AW, England
[2] Univ Padua, Dipartimento Astron, I-35122 Padua, Italy
[3] Univ Western Cape, Astrophys Grp, Dept Phys, ZA-7535 Cape Town, South Africa
[4] Univ London Imperial Coll Sci Technol & Med, Dept Math, London SW7 2AW, England
[5] Inst Astrofis Canarias, E-38200 Tenerife, Spain
[6] Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain
关键词
galaxies: evolution; galaxies: starburst; cosmology: observations; infrared: galaxies; STAR-FORMATION HISTORY; BRIGHT GALAXY SAMPLE; 250; MU-M; FORMING GALAXIES; DEEP SURVEY; REDSHIFT SURVEY; LIMITED SAMPLE; IRAS GALAXIES; SWIRE SURVEY; ISO SURVEY;
D O I
10.1093/mnras/sts013
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present new observational determination of the evolution of the rest-frame 70 and 160 mu m and total infrared (TIR) galaxy luminosity functions (LFs) using 70 and 160 mu m data from the Spitzer Wide-area Infrared Extragalactic (SWIRE) Legacy survey. The LFs were constructed for sources with spectroscopic redshifts only in the XMM-LSS and Lockman Hole fields from the SWIRE photometric redshift catalogue. The 70 mu m and TIR LFs were constructed in the redshift range 0 < z < 1.2 and the 160 mu m LF was constructed in the redshift range 0 < z < 0.5 using a parametric Bayesian and the 1/V-max methods. We assume in our models that the faint-end power-law index of the LF does not evolve with redshift. We find that the double power-law model is a better representation of the infrared (IR) LF than the more commonly used power-law and Gaussian model. We model the evolution of the far-IR LFs as a function of redshift where the characteristic luminosity L* evolve as proportional to (1 + z)L-alpha. The rest-frame 70 mu m LF shows a strong luminosity evolution out to z = 1.2 with alpha L = 3.41(-0.25)(+0.18). The rest-frame 160 mu m LF also showed rapid luminosity evolution with alpha L = 5.53(-0.23)(+0.28) out to z = 0.5. The rate of evolution in luminosity is consistent with values estimated from previous studies using data from IRAS, ISO and Spitzer. The TIR LF evolves in luminosity with alpha L = 3.82(-0.16)(+0.28) which is in agreement with previous results from Spitzer 24 mu m which find strong luminosity evolution. By integrating the LF we calculated the comoving IR luminosity density out to z = 1.2, which confirms the rapid evolution in number density of luminous IR galaxies which contribute similar to 68(-07)(+10) per cent to the comoving star formation rate density at z = 1.2. Our results based on 70 mu m data confirm that the bulk of the star formation at z = 1 takes place in dust-obscured objects.
引用
收藏
页码:291 / 306
页数:16
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