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For refcode 2001AJ....121.2843B:
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2001AJ....121.2843B QUASARS IN THE 2MASS SECOND INCREMENTAL DATA RELEASE WAYNE A. BARKHOUSE AND PATRICK B. HALL Department of Astronomy, University of Toronto, 60 St. George Street, Toronto, ON, M5S 3H8; barkhous@astro.utoronto.ca Received 2000 October 4; accepted 2001 January 16 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 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. Key words: catalogs-galaxies: active-infrared: general -quasars: general ============================================================================ 2001AJ....122..496B ERRATUM: "QUASARS IN THE 2MASS SECOND INCREMENTAL DATA RELEASE" [ASTRON. J. 121, 2843 (2001)] WAYNE A. BARKHOUSE AND PATRICK B. HALL Department of Astronomy, University of Toronto Received 2001 May 1; accepted 2001 May 1 A set of data points representing 2MASS point sources was inadvertently excluded from the final version of Figures 6 and 7. The correct figures appear below. See Journal. ===========================================================================
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