Quasars in the 2MASS Second Incremental Data Release

Abstract

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 4A 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 Ðnd 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 signiÐcant level. This is consistent with dust-reddened quasars being more common in radio-selected samples than in optically selected samples, due to stronger selection e †ects against dust-reddened quasars in the latter. We also Ðnd a statistically signiÐcant 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 Ðnd 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.