/ftp/cats/aliases/U/UBW2009



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J/ApJ/698/1095        The FIRST-2MASS red QSO survey. II.       (Urrutia+, 2009)
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Beginning of ReadMe : J/ApJ/698/1095 The FIRST-2MASS red QSO survey. II. (Urrutia+, 2009) ================================================================================ The FIRST-2MASS red quasar survey. II. An anomalously high fraction of LoBALs in searches for dust-reddened quasars. Urrutia T., Becker R.H., White R.L., Glikman E., Lacy M., Hodge J., Gregg M.D. <Astrophys. J., 698, 1095-1109 (2009)> =2009ApJ...698.1095U ================================================================================ ADC_Keywords: Surveys ; Redshifts ; QSOs ; Photometry, SDSS ; Radio sources ; Photometry ; Infrared sources Keywords: galaxies: active - galaxies: evolution - quasars: absorption lines - quasars: general Abstract: We present results on a survey to find extremely dust-reddened Type 1 quasars. Combining the FIRST radio survey, the 2MASS Infrared Survey and the Sloan Digital Sky Survey, we have selected a candidate list of 122 potential red quasars. With more than 80% spectroscopically identified objects, well over 50% are classified as dust-reddened Type 1 quasars, whose reddenings (E(B-V)) range from approximately 0.1 to 1.5mag. They lie well off the color selection windows usually used to detect quasars and many fall within the stellar locus, which would have made it impossible to find these objects with traditional color selection techniques. The reddenings found are much more consistent with obscuration happening in the host galaxy rather than stemming from the dust torus. We find an unusually high fraction of broad absorption line (BAL) quasars at high redshift, all but one of them belonging to the low-ionization BAL (LoBAL) class and many also showing absorption in the metastable FeII line (FeLoBAL). The discovery of further examples of dust-reddened LoBAL quasars provides more support for the hypothesis that BAL quasars (at least LoBAL quasars) represent an early stage in the lifetime of the quasar. The fact that we see such a high fraction of BALs could indicate that the quasar is in a young phase in which quasar feedback from the BAL winds is suppressing star formation in the host galaxy. Description: To create a list of candidate red quasars, the 2MASS All-Sky Point Source Catalog (Cat. II/246) was matched to the FIRST source catalog (Becker et al., 1995ApJ...450..559B) within 2". We then matched the FIRST-2MASS catalog to the approximately 215 million sources in the DR5 SDSS (Cat. VII/252) imaging catalog within 2". We filter the F2M-SDSS catalog for objects that are very red, i.e., r'-K>5. This extremely red color filter leaves us with 603 objects inspected bye eye. The J-K>1.3 color filter further reduces our catalog to 122 sources, which is our final F2MS catalog. To identify the red quasar candidates, we conducted follow-up spectroscopy. Our spectroscopic observations were conducted mostly at the 10m Keck telescope with the ESI instrument.