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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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 154 122 Properties and identification of red quasar candidates table2.dat 46 51 Spectral properties of the quasars table3.dat 71 21 Absorption trough properties of quasars with z>0.9 refs.dat 88 43 References
See also: VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010) VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010) VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) VII/240 : Millennium Galaxy Catalogue (Liske+, 2003) VII/204 : Galaxy properties at NGP (Odewahn+ 1995) VIII/53 : The Green Bank Survey (Maslowski+ 1972-87) J/ApJ/667/673 : FIRST-2MASS red quasar survey (Glikman+, 2007) J/AJ/126/63 : Host galaxies of 2MASS-QSOs with z≤3 (Hutchings+, 2003) J/AJ/126/2125 : SDSS candidate type II quasars (Zakamska+, 2003) J/ApJ/569/23 : Optical polarisation of 2MASS QSOs (Smith+, 2002) J/ApJS/135/227 : The FIRST bright quasar survey. III. (Becker+, 2001) J/A+AS/128/153 : Revised GB/GB2 sample of radio sources (Machalski 1998) J/A+AS/109/147 : ROSAT AGN content (Brinkmann+, 1995) J/ApJS/100/1 : Second Caltech-Jodrell Bank VLBI Survey. II. (Henstock+ 1995) J/A+AS/96/389 : Warm IRAS sources. II. (de Grijp+, 1992) J/A+AS/65/267 : A 5-GHz Survey of Radio Sources (Altschuler 1986) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq [1/122] Running sequence number identification (<[UBW2009] NNN> in Simbad) 5- 6 I2 h RAh FIRST hour of right ascension (J2000) 8- 9 I2 min RAm FIRST minute of right ascension (J2000) 11- 15 F5.2 s RAs FIRST second of right ascension (J2000) 17 A1 --- DE- FIRST sign of the declination (J2000) 19- 20 I2 deg DEd FIRST degree of declination (J2000) 22- 23 I2 arcmin DEm FIRST arcminute of declination (J2000) 25- 29 F5.2 arcsec DEs FIRST arcsecond of declination (J2000) 31- 37 F7.2 mJy F20cm FIRST catalog peak 20cm flux density 39- 43 F5.2 mag u'mag SDSS-DR5 u' band magnitude 45- 49 F5.2 mag g'mag SDSS-DR5 g' band magnitude 51- 55 F5.2 mag r'mag SDSS-DR5 r' band magnitude 57- 61 F5.2 mag i'mag SDSS-DR5 i' band magnitude 63- 67 F5.2 mag Jmag 2MASS J band magnitude 69- 73 F5.2 mag Ksmag 2MASS Ks band magnitude 75- 78 F4.2 mag r'-Ks The r'-Ks color index 80- 83 F4.2 mag J-Ks The J-Ks color index 85- 90 A6 --- Spec Observatory where the spectrum was obtained (1) 92- 98 A7 --- OType Spectroscopic object type 100-105 F6.4 --- z ? Redshift 107-139 A33 --- Comm Comments 141-154 A14 --- Ref References code; see refs.dat file
Note (1): Abbreviations as follows: ESI = ESI instrument at the 10m Keck telescope, at a spectral resolution of ∼1.25Å. KAST = KAST spectrograph on the Shane 3m telescope at the Lick observatory, at a spectral resolution of ∼2.35Å. LRIS = Low Resolution Imaging Spectrometer (LRIS) instrument on the Keck 10m telescope Liter. = Spectroscopy from literature NOT = ALFOSC spectrograph on the 2.5m Nordic Optical Telescope (NOT) SDSS = Spectra from SDSS SOAR = Goodman Spectrograph on the 4.1m SOAR telescope Spex = near-IR spectra from the Spex instrument on the Infrared Telescope Facility 3m telescope
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [F2MS] 5- 13 A9 --- F2MS Quasar identification 15- 19 F5.3 --- z Redshift 21- 24 F4.2 mag E(B-V) Reddening 26- 29 F4.2 mag e_E(B-V) E(B-V) uncertainty 31- 34 I4 km/s WHb ? Hβ width 35 A1 --- f_WHb [*] peculiar Hβ lines (1) 37- 39 I3 km/s e_WHb ? WHb uncertainty 41- 46 F6.2 mag iMAG Absolute i band magnitude
Note (1): * = F2MS1618+3502 and F2MS1656+3821 showed broad lines in their spectra in the near-IR and these were therefore classified as Type 1 quasars whereas their Hβ line are not broader than 1000km/s. See section 2.2 for further details.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [F2MS] 5- 13 A9 --- F2MS Quasar identification 15- 19 F5.3 --- z Redshift 21- 25 I5 --- Baln ?=0 MgII line balnicity (see "f_Baln" column) 26 A1 --- f_Baln [a] Baln derived from CIV (1) 28- 32 I5 --- Abs ?=0 MgII line absorption index (see "f_Abs") otherwise flagged 33 A1 --- f_Abs [a] Abs derived from CIV (1) 35- 42 F8.3 --- Chi2 ? χ2 fit 44- 71 A28 --- OType Object type (2)
Note (1): 'a' indicates CIV derived Balnicities and Absorption Index, all other are for the MgII line, which in most cases had much higher signal-to-noise ratio in the spectra. Note (2): Obect types: BAL = Broad absorption line quasar (BAL quasar) LoBAL = Low-ionization BAL (showing broad absorption troughs in the MgII line) FeLoBAL = FeII low-ionization BAL (with absorption troughs in the metastable FeII line) HiBAL = only show prominent absorption troughs in the high-ionization lines such as CIV Mini-BAL = Object that would have been rejected as a BAL by Weymann et al. (1991ApJ...373...23W) since the absorption troughs were either too narrow (below 2000km/s, but above 1000km/s), or because they were so close to the emission redshift and could have been mistaken with absorbers associated with the host galaxy (although most host galaxies do not have such large velocity dispersions). We, yet, include them in the discussion about BALs. See section 3.2 for further details.
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Ref Code reference 7- 25 A19 --- BibCode Bibcode 27- 47 A21 --- Aut Author's reference 49- 88 A40 --- Note VizieR catalog reference
History: From electronic version of the journal References: Glikman et al. Paper I. 2007ApJ...667..673G Cat. J/ApJ/667/673
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 10-Jun-2011
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