Far-infrared properties of submillimeter and optically faint radio galaxies

被引：72

作者：

Magnelli, B. ^{[1
]}

Lutz, D. ^{[1
]}

Berta, S. ^{[1
]}

Altieri, B. ^{[2
]}

Andreani, P. ^{[3
]}

Aussel, H. ^{[4
]}

Castaneda, H. ^{[5
,6
]}

Cava, A. ^{[5
,6
]}

Cepa, J. ^{[5
,6
]}

Cimatti, A. ^{[7
]}

Daddi, E. ^{[4
]}

Dannerbauer, H. ^{[4
]}

Dominguez, H. ^{[8
]}

Elbaz, D. ^{[4
]}

Schreiber, N. Foerster ^{[1
]}

Genzel, R. ^{[1
]}

Grazian, A. ^{[9
]}

Gruppioni, C. ^{[8
]}

Magdis, G. ^{[4
]}

Maiolino, R. ^{[9
]}

Nordon, R. ^{[1
]}

Perez Fournon, I. ^{[5
,6
]}

Garcia, I. Perez ^{[2
]}

Poglitsch, A. ^{[1
]}

Popesso, P. ^{[1
]}

Pozzi, F. ^{[7
]}

Riguccini, L. ^{[4
]}

Rodighiero, G. ^{[10
]}

Saintonge, A. ^{[1
]}

Santini, P. ^{[9
]}

Sanchez-Portal, M. ^{[2
]}

Shao, L. ^{[1
]}

Sturm, E. ^{[1
]}

Tacconi, L. ^{[1
]}

Valtchanov, I. ^{[4
]}

Wieprecht, E. ^{[1
]}

Wiezorrek, E. ^{[1
]}

机构：

[1] Max Planck Inst Extraterr Phys MPE, D-85741 Garching, Germany

[2] Univ Paris Diderot, Lab AIM, CEA DSM CNRS, IRFU Serv Astrophys, F-91191 Gif Sur Yvette, France

[3] ESO, D-85748 Garching, Germany

[4] INAF Osservatorio Astron Trieste, I-34143 Trieste, Italy

[5] Inst Astrofis Canarias, San Cristobal la Laguna 38205, Spain

[6] Univ La Laguna, Dept Astrofis, E-38207 San Cristobal la Laguna, Spain

[7] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy

[8] INAF Osservatorio Astron Bologna, I-40127 Bologna, Italy

[9] INAF Osservatorio Astron Roma, I-00040 Monte Porzio Catone, Italy

[10] Univ Padua, Dipartimento Astron, I-35122 Padua, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2010年 / 518卷

关键词：

infrared: galaxies; submillimeter: galaxies; galaxies: evolution; galaxies: starburst; SPECTRAL ENERGY-DISTRIBUTION; STAR-FORMING GALAXIES; ULTRALUMINOUS GALAXIES; MASSIVE GALAXIES; HIGH-REDSHIFT; Z-SIMILAR-TO-2; MULTIWAVELENGTH; POPULATION; EMISSION; GROWTH;

D O I：

10.1051/0004-6361/201014616

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use deep observations obtained with the Photodetector Array Camera and Spectrometer (PACS) onboard the Herschel Space Observatory to study the far-infrared (FIR) properties of submillimeter and optically faint radio galaxies (SMGs and OFRGs). From literature we compiled a sample of 35 securely identified SMGs and nine OFRGs located in the GOODS-N and the A2218 fields. This sample is cross-matched with our PACS 100 mu m and 160 mu m multi-wavelength catalogs based on sources-extraction using prior detections at 24 mu m. About half of the galaxies in our sample are detected in at least the PACS 160 mu m bandpass. The dust temperatures and the infrared luminosities of our galaxies are derived by fitting their PACS and SCUBA 850 mu m (only the upper limits for the OFRGs) flux densities with a single modified (beta = 1.5) black body function. The median dust temperature of our SMG sample is T-dust = 36 +/- 8 K while for our OFRG sample it is T-dust = 47 +/- 3 K. For both samples, median dust temperatures derived from Herschel data agree well with previous estimates. In particular, Chapman et al. (2005, ApJ, 622, 772) found a dust temperature of T-dust = 36 +/- 7K for a large sample of SMGs assuming the validity of the FIR/radio correlation (i.e., q = log(10)(L-FIR[W]/L-1.4 (GHz)[W Hz(-1)]/3.75x10(12))). The agreement between our studies confirms that the local FIR/radio correlation effectively holds at high redshift even though we find < q > = 2.17 +/- 0.19, a slightly lower value than that observed in local systems. The median infrared luminosities of SMGs and OFRGs are 4.6x10(12) L-circle dot and 2.6x10(12) L-circle dot, respectively. We note that for both samples the infrared luminosity estimates from the radio part of the spectral energy distribution (SED) are accurate, while estimates from the mid-IR are considerably (similar to x3) more uncertain. Our observations confirm the remarkably high luminosities of SMGs and thus imply median star-formation rates of 960 M-circle dot yr(-1) for SMGs with S (850 mu m) > 5 mJy and 460 M-circle dot yr(-1) for SMGs with S (850 mu m) > 2 mJy, assuming a Chabrier IMF and no dominant AGN contribution to the far-infrared luminosity.

引用

页数：4

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