SIMBAD references

2001AJ....121.2843B - Astron. J., 121, 2843-2850 (2001/May-0)

Quasars in the 2MASS second incremental data release.

BARKHOUSE W.A. and HALL P.B.

Abstract (from CDS):

Using the 2MASS Second Incremental Data Release, we have searched for near-infrared counterparts to 13214 quasars from the Veron-Cetty & Veron catalog. We have detected counterparts within 4" for 2277 of the approximately 6320 quasars within the area covered by the 2MASS Second Incremental Data Release. Only 1.6% of these are expected to be chance coincidences. Though this sample is heterogeneous, we find that known radio-loud quasars are more likely to have large near-infrared-to-optical luminosity ratios than radio-quiet quasars are, at a statistically significant level. This is consistent with dust-reddened quasars being more common in radio-selected samples than in optically selected samples, due to stronger selection effects against dust-reddened quasars in the latter. We also find a statistically significant dearth of optically luminous quasars with large near-infrared-to-optical luminosity ratios. This can be explained in a dust obscuration model but not in a model where synchrotron emission extends from the radio into the near-infrared and creates such large ratios. We also find that selection of quasar candidates from the B-J/J-K color-color diagram, modeled on the V-J/J-K selection method of Warren, Hewett, & Foltz, is likely to be more sensitive to dust-obscured quasars than selection using only infrared-infrared colors.

Abstract Copyright:

Journal keyword(s): Catalogs - Galaxies: Active - Infrared Radiation - Galaxies: Quasars: General

VizieR on-line data: <Available at CDS (J/AJ/121/2843): table1.dat table2.dat>

Nomenclature: Tables 1, 2: 2MASSI JHHMMSSs+DDMMSS N=2277+3999.

Errata: Erratum vol. 122, p. 496 (2001)

Simbad objects: 6250

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