2010A&A...518L..28M


Query : 2010A&A...518L..28M

2010A&A...518L..28M - Astronomy and Astrophysics, volume 518, L28-28 (2010/7-2)

Far-infrared properties of submillimeter and optically faint radio galaxies.

MAGNELLI B., LUTZ D., BERTA S., ALTIERI B., ANDREANI P., AUSSEL H., CASTANEDA H., CAVA A., CEPA J., CIMATTI A., DADDI E., DANNERBAUER H., DOMINGUEZ H., ELBAZ D., FOERSTER-SCHREIBER N., GENZEL R., GRAZIAN A., GRUPPIONI C., MAGDIS G., MAIOLINO R., NORDON R., PEREZ-FOURNON I., PEREZ GARCIA I., POGLITSCH A., POPESSO P., POZZI F., RIGUCCINI L., RODIGHIERO G., SAINTONGE A., SANTINI P., SANCHEZ-PORTAL M., SHAO L., STURM E., TACCONI L., VALTCHANOV I., WIEPRECHT E. and WIEZORREK E.

Abstract (from CDS):

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 100µm and 160µm multi-wavelength catalogs based on sources-extraction using prior detections at 24µm. About half of the galaxies in our sample are detected in at least the PACS 160µm bandpass. The dust temperatures and the infrared luminosities of our galaxies are derived by fitting their PACS and SCUBA 850µm (only the upper limits for the OFRGs) flux densities with a single modified (β=1.5) black body function. The median dust temperature of our SMG sample is Tdust=36±8K while for our OFRG sample it is Tdust=47±3K. For both samples, median dust temperatures derived from Herschel data agree well with previous estimates. In particular, Chapman et al. (2005ApJ...622..772C) found a dust temperature of Tdust=36±7K for a large sample of SMGs assuming the validity of the FIR/radio correlation (i.e., q=log10(LFIR[W]/L1.4GHz[W/Hz]/3.75x1012)). 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 4.6x1012L and 2.6x1012L, 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 (∼x3) more uncertain. Our observations confirm the remarkably high luminosities of SMGs and thus imply median star-formation rates of 960M/yr for SMGs with S(850µm)>5mJy and 460M/yr for SMGs with S(850µm)>2mJy, assuming a Chabrier IMF and no dominant AGN contribution to the far-infrared luminosity.

Abstract Copyright:

Journal keyword(s): infrared: galaxies - submillimeter: galaxies - galaxies: evolution - galaxies: starburst

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME SMM J123616.15+621513.7 AGN 12 36 16.11 +62 15 13.7 27.8 25.8257 25.78 25.3 26.6108 ~ 66 0
2 NAME SMM J123618+621009 G 12 36 19.12 +62 10 04.3 26.78         ~ 25 0
3 [WCB2004] GOODS 850-15a mm 12 36 21.101 +62 17 09.60           ~ 35 0
4 NAME SMM J123621.3+621708 G 12 36 21.25 +62 17 08.3   25.1     25.0 ~ 54 0
5 NAME MM J123633+6214.1 G 12 36 33.2 +62 14 07           ~ 62 0
6 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 1069 1
7 NAME SMM J123707.2+621408 AGN 12 37 07.19 +62 14 08.0 28.12 26.8993 26.6 25.6 25.3860 ~ 106 0
8 [PSD2006] GN20.2a G 12 37 08.840 +62 22 02.37     25.150     ~ 42 0
9 NAME SMM J123711+622212 AGN 12 37 11.92 +62 22 12.1   27.1786 25.185   24.4196 ~ 189 0
10 NAME SMM J123712.0+621325 rG 12 37 12.000 +62 13 25.83 25.92 26.0414 26.2 25.6 25.1091 ~ 67 2
11 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 797 1
12 NAME SMM J16359+6613 G 16 35 55.62 +66 12 59.5           ~ 60 1

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2023.01.27-19:01:54

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