Multi-Wavelength Observations of Obscured Regions

Details Multi-Wavelength Observations of Obscured Regions Multi-Wavelength Observations of Obscured Regions

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dms..conf...19b&link_type=abstract

DEEP MILLIMETER SURVEYS Implications for Galaxy Formation and Evolution. Held 19-21 June 2000 in University of Massachusetts, Am

Astronomy and Astrophysics

Astronomy

Scientific paper

With recent Chandra observations, at least 75 percent of the 2-10 keV background is now resolved into discrete sources. We have obtained deep optical, near-infrared, submillimeter, and 20 cm (radio) images, as well as high-quality optical spectra, of a complete sample of 20 hard X-ray sources in a deep Chandra observation of the SSA13 field. The thirteen I < 23.5 galaxies have redshifts in the range 0.1 to 2.6. Two are quasars, five show AGN signatures, and six are z < 1.5 luminous early galaxies whose spectra show no obvious optical AGN signatures. The seven spectroscopically unidentified sources have colors that are consistent with evolved early galaxies at z = 1.5-3. Only one hard X-ray source is significantly detected in an ultradeep submillimeter map; its millimetric redshift is in the range z = 1.2-2.4. None of the remaining 19 sources are detected in the submillimeter. These results probably reflect the fact that the 850μm flux limits obtainable with SCUBA are quite close to the expected fluxes from obscured AGN. The hard X-ray sources have an average LFIR/L2-10 keV ~ 60, similar to that of local obscured AGN. The same ratio for a sample of submillimeter selected sources is in excess of 1100, suggesting that their far-infrared light is primarily produced by star formation.

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