NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-12-15 T01:41:52 PST
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For refcode 2009ApJ...692..422L:
Retrieve 61 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
2009ApJ...692..422L MAMBO 1.2 mm Observations of Luminous Starbursts at z ~ 2 in the SWIRE Fields Lonsdale, Carol J.; Polletta, Maria del Carmen; Omont, Alain; Shupe, Dave; Berta, Stefano; Zylka, Robert; Siana, Brian; Lutz, Dieter; Farrah, Duncan; Smith, Harding E.; Lagache, Guilaine; DeBreuck, Carlos; Owen, Frazer; Beelen, Alexandre; Weedman, Dan; Franceschini, Alberto; Clements, Dave; Tacconi, Linda; Afonso-Luis, Alejandro; Perez-Fournon, Ismael; Cox, Pierre; Bertoldi, Frank Abstract. We report on-off pointed MAMBO observations at 1.2 mm of 61 Spitzer-selected star-forming galaxies from the Spitzer Wide Area Infrared Extragalactic Legacy survey (SWIRE). The sources are selected on the basis of bright 24 micron fluxes (f_24 micron_ > 0.4 mJy) and of stellar dominated near-infrared spectral energy distributions in order to favor z ~ 2 starburst galaxies. The average 1.2 mm flux for the whole sample is 1.5 +/- 0.2 mJy. Our analysis focuses on 29 sources in the Lockman Hole field where the average 1.2 mm flux (1.9 +/- 0.3 mJy) is higher than in other fields (1.1 +/- 0.2 mJy). The analysis of the multiwavelength spectral energy distributions indicates that these sources are starburst galaxies with far-infrared luminosities from 10^12^ to 10^13.3^ L_sun_, and stellar masses of ~0.2-6 x 10^11^ M_sun_. Compared to submillimeter selected galaxies (SMGs), the SWIRE-MAMBO sources are among those with the largest 24 micron/1.2 mm flux ratios. The origin of such large ratios is investigated by comparing the average mid-infrared spectra and the stacked far-infrared spectral energy distributions of the SWIRE-MAMBO sources and of SMGs. The mid-infrared spectra, available for a handful of sources, exhibit strong polycyclic aromatic hydrocarbon (PAH) features, and a warm dust continuum. The warm dust continuum contributes ~34% of the mid-infrared emission, and is likely associated with an AGN component. This contribution is consistent with what is found in SMGs. The large 24 micron/1.2 mm flux ratios are thus not due to AGN emission, but rather to enhanced PAH emission compared to SMGs. The analysis of the stacked far-infrared fluxes yields warmer dust temperatures than typically observed in SMGs. Our selection favors warm ultraluminous infrared sources at high-z, a class of objects that is rarely found in SMG samples. Indeed SMGs are not common among bright 24 micron sources (e.g., only about 20% of SMGs have f_24 micron_ > 0.4 mJy). Our sample is the largest Spitzer-selected sample detected at millimeter wavelengths currently available. Key words: cosmology: observations, galaxies: formation, galaxies: high-redshift, galaxies: starburst, infrared: galaxies, submillimeter
Retrieve 61 NED objects in this reference.
Please click here for ADS abstract

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