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Date and Time of the Query: 2018-07-20 T07:09:17 PDT
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For refcode 2012AJ....143..125M:
Retrieve 113 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
2012AJ....143..125M The Spectral Energy Distributions and Infrared Luminosities of z ~ 2 Dust-obscured Galaxies from Herschel and Spitzer Melbourne, J.; Soifer, B. T.; Desai, Vandana; Pope, Alexandra; Armus, Lee; Dey, Arjun; Bussmann, R. S.; Jannuzi, B. T.; Alberts, Stacey Abstract. Dust-obscured galaxies (DOGs) are a subset of high-redshift (z ~ 2) optically-faint ultra-luminous infrared galaxies (ULIRGs, e.g., L_IR_ > 10^12^ L_&sun;_). We present new far-infrared photometry, at 250, 350, and 500 micron (observed-frame), from the Herschel Space Telescope for a large sample of 113 DOGs with spectroscopically measured redshifts. Approximately 60% of the sample are detected in the far-IR. The Herschel photometry allows the first robust determinations of the total infrared luminosities of a large sample of DOGs, confirming their high IR luminosities, which range from 10^11.6^ L_&sun;_ <L_IR_(8-1000 micron) < 10^13.6^ L_&sun;_. 90% of the Herschel-detected DOGs in this sample are ULIRGs and 30% have L_IR_ > 10^13^ L_&sun;_. The rest-frame near-IR (1-3 micron) spectral energy distributions (SEDs) of the Herschel-detected DOGs are predictors of their SEDs at longer wavelengths. DOGs with "power-law" SEDs in the rest-frame near-IR show observed-frame 250/24 micron flux density ratios similar to the QSO-like local ULIRG, Mrk 231. DOGs with a stellar "bump" in their rest-frame near-IR show observed-frame 250/24 micron flux density ratios similar to local star-bursting ULIRGs like NGC 6240. None show 250/24 micron flux density ratios similar to extreme local ULIRG, Arp 220; though three show 350/24 micron flux density ratios similar to Arp 220. For the Herschel-detected DOGs, accurate estimates (within ~25%) of total IR luminosity can be predicted from their rest-frame mid-IR data alone (e.g., from Spitzer observed-frame 24 micron luminosities). Herschel-detected DOGs tend to have a high ratio of infrared luminosity to rest-frame 8 micron luminosity (the IR8 = L_IR_(8-1000 micron)/nuL_nu_(8 micron) parameter of Elbaz et al.). Instead of lying on the z = 1-2 "infrared main sequence" of star-forming galaxies (like typical LIRGs and ULIRGs at those epochs) the DOGs, especially large fractions of the bump sources, tend to lie in the starburst sequence. While, Herschel-detected DOGs are similar to scaled up versions of local ULIRGs in terms of 250/24 micron flux density ratio, and IR8, they tend to have cooler far-IR dust temperatures (20-40 K for DOGs versus 40-50 K for local ULIRGs) as measured by the rest-frame 80/115 micron flux density ratios (e.g., observed-frame 250/350 micron ratios at z = 2). DOGs that are not detected by Herschel appear to have lower observed-frame 250/24 micron ratios than the detected sample, either because of warmer dust temperatures, lower IR luminosities, or both. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. Key words: galaxies: high-redshift, galaxies: starburst, infrared: galaxies, submillimeter: galaxies
Retrieve 113 NED objects in this reference.
Please click here for ADS abstract

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