2013ApJ...778..127G

Query : 2013ApJ...778..127G

2013ApJ...778..127G - Astrophys. J., 778, 127 (2013/December-1)

Dust reddened quasars in FIRST and UKIDSS: beyond the tip of the iceberg.

GLIKMAN E., URRUTIA T., LACY M., DJORGOVSKI S.G., URRY M., CROOM S., SCHNEIDER D.P., MAHABAL A., GRAHAM M. and GE J.

Abstract (from CDS):

We present the results of a pilot survey to find dust-reddened quasars by matching the Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) radio catalog to the UKIDSS near-infrared survey and using optical data from Sloan Digital Sky Survey to select objects with very red colors. The deep K-band limit provided by UKIDSS allows for finding more heavily reddened quasars at higher redshifts as compared with previous work using FIRST and Two Micron All Sky Survey (2MASS). We selected 87 candidates with K ≤ 17.0 from the UKIDSS Large Area Survey (LAS) First Data Release (DR1), which covers 190 deg2. These candidates reach up to ∼1.5 mag below the 2MASS limit and obey the color criteria developed to identify dust-reddened quasars. We have obtained 61 spectroscopic observations in the optical and/or near-infrared, as well as classifications in the literature, and have identified 14 reddened quasars with E(B - V) > 0.1, including 3 at z > 2. We study the infrared properties of the sample using photometry from the Wide-Field Infrared Survey Explorer and find that infrared colors improve the efficiency of red quasar selection, removing many contaminants in an infrared-to-optical color-selected sample alone. The highest-redshift quasars (z ≳ 2) are only moderately reddened, with E(B - V) ∼ 0.2-0.3. We find that the surface density of red quasars rises sharply with faintness, comprising up to 17% of blue quasars at the same apparent K-band flux limit. We estimate that to reach more heavily reddened quasars (i.e., E(B - V) ≳ 0.5) at z > 2 and a depth of K = 17, we would need to survey at least ∼2.5 times more area.

Abstract Copyright: ∼

Journal keyword(s): dust, extinction - galaxies: evolution - quasars: general - surveys

VizieR on-line data: <Available at CDS (J/ApJ/778/127): table1.dat table2.dat>

Nomenclature: Table 1: [GUL2013] JHHMMSS.ss+DDMMSS.s N=87, Table 2: [GUL2013] UKFS HHMM+DDMM N=14.

Simbad objects: 88

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Number of rows : 88
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SDSS J001242.67-004514.7 QSO 00 12 42.671 -00 45 14.78           ~ 1 0
2 SDSS J001600.60-003859.2 QSO 00 16 00.603 -00 38 59.29           ~ 11 0
3 FIRST J002053.9+002026 rG 00 20 53.932 +00 20 26.76           ~ 1 0
4 FIRST J002742.2+000540 rG 00 27 42.144 +00 05 39.58           ~ 1 0
5 FIRST J003004.9+002501 QSO 00 30 04.955 +00 25 01.43 19.71   18.87     ~ 2 0
6 IRAS F00344-0130 Sy1 00 36 59.8312535184 -01 13 32.518899516   21.63 20.76 20.023 18.630 ~ 15 0
7 FIRST J004345.1-000207 rG 00 43 45.146 -00 02 07.09           ~ 2 0
8 [GUL2013] J012033.54+005459.2 Q? 01 20 33.58280 +00 54 59.5273           ~ 2 0
9 FIRST J012615.1+003747 rG 01 26 15.122 +00 37 47.76           ~ 1 0
10 QSO B0131-001 QSO 01 34 12.70415461 +00 03 45.1386194   23.34 22.50 20.780   ~ 43 1
11 FIRST J013518.8+001222 rG 01 35 18.878 +00 12 21.78           ~ 2 0
12 SDSS J013539.44-004322.1 QSO 01 35 39.45408 -00 43 22.1484           ~ 2 0
13 FIRST J013723.4-000537 rG 01 37 23.450 -00 05 37.73           ~ 2 0
14 FIRST J013724.8+000950 rG 01 37 24.848 +00 09 49.13           ~ 3 1
15 SDSS J014131.02+010100.6 QSO 01 41 31.02624 +01 01 00.5988           ~ 9 0
16 FIRST J014216.0+011511 rG 01 42 15.987 +01 15 11.38           ~ 2 0
17 ICRF J015243.1+002039 Sy1 01 52 43.14997065 +00 20 39.7114838   20.98 20.72     ~ 43 1
18 FIRST J015416.3-000305 rG 01 54 16.396 -00 03 04.73           ~ 1 0
19 FIRST J015453.7+001018 rG 01 54 53.732 +00 10 18.03           ~ 2 0
20 FIRST J015647.6-005807 QSO 01 56 47.607 -00 58 07.76   21.12 20.47 19.88   ~ 8 0
21 SDSS J015821.10+002752.7 QSO 01 58 21.107 +00 27 52.77           ~ 2 0
22 FIRST J020023.3+000341 rG 02 00 23.298 +00 03 42.11           ~ 2 0
23 FIRST J020315.8-001432 rG 02 03 15.762 -00 14 33.19           ~ 1 0
24 FIRST J020343.3-010224 rG 02 03 43.330 -01 02 24.67           ~ 2 0
25 FIRST J020445.4-010614 rG 02 04 45.393 -01 06 12.93           ~ 3 0
26 FIRST J020907.5-010544 rG 02 09 07.499 -01 05 44.35           ~ 4 0
27 FIRST J021038.9-000547 Q? 02 10 38.897 -00 05 47.54           ~ 1 0
28 FIRST J021145.8+005213 rG 02 11 45.820 +00 52 13.57           ~ 2 0
29 FIRST J021345.4+002436 QSO 02 13 45.4483 +00 24 36.112           ~ 6 0
30 FIRST J021550.9-004245 rG 02 15 50.925 -00 42 46.40           ~ 1 0
31 FIRST J021652.9-010233 rG 02 16 52.975 -01 02 33.51           ~ 2 0
32 FIRST J022003.6-000027 rG 02 20 03.600 -00 00 28.09           ~ 1 0
33 [GUL2013] J022301.17+001009.2 QSO 02 23 01.203 +00 10 09.40           ~ 1 0
34 FIRST J022518.7+003416 rG 02 25 18.777 +00 34 16.53           ~ 1 0
35 FIRST J022534.3+010838 rG 02 25 34.301 +01 08 37.51           ~ 1 0
36 FIRST J022827.4-000240 rG 02 28 27.406 -00 02 39.44           ~ 1 0
37 NVSS J023312+001713 rG 02 33 11.638 +00 17 19.64           ~ 1 0
38 FIRST J024748.9-005628 rG 02 47 48.933 -00 56 27.89           ~ 1 0
39 FIRST J025120.0-002349 rG 02 51 20.000 -00 23 49.13           ~ 1 0
40 FIRST J030007.1+005321 rG 03 00 07.152 +00 53 19.77           ~ 1 0
41 FIRST J030037.2+010443 rG 03 00 37.272 +01 04 41.82           ~ 1 0
42 FIRST J030137.1+004321 rG 03 01 37.085 +00 43 21.73           ~ 1 0
43 FIRST J030339.8+010623 rG 03 03 39.836 +01 06 23.14           ~ 1 0
44 NVSS J081906+044624 rG 08 19 06.39371 +04 46 26.7602           ~ 1 0
45 FIRST J082056.3+045340 Q? 08 20 56.359 +04 53 39.81           ~ 1 0
46 FIRST J082209.4+052318 Q? 08 22 09.479 +05 23 19.10           ~ 1 0
47 [GUL2013] J082930.69+044934.3 Q? 08 29 30.694 +04 49 34.25           ~ 1 0
48 SDSS J083026.56+050522.9 * 08 30 26.5645961448 +05 05 22.958692692           ~ 1 0
49 FIRST J083719.7-011518 Q? 08 37 19.725 -01 15 18.57           ~ 1 0
50 FIRST J083759.4+050611 rG 08 37 59.344 +05 06 09.82           ~ 1 0
51 [GUL2013] J090635.91+060732.8 * 09 06 35.857 +06 07 31.44           ~ 1 0
52 [GUL2013] J090846.11+052843.3 Sy2 09 08 46.105 +05 28 43.11   21.82 21.43     ~ 5 0
53 NVSS J090917+054108 * 09 09 17.306 +05 41 11.32           ~ 1 0
54 [GUL2013] J092543.94-025747.1 Q? 09 25 43.943 -02 57 47.12           ~ 1 0
55 [GUL2013] J093852.20-020059.5 Q? 09 38 52.204 -02 00 59.50           ~ 1 0
56 FIRST J094252.9-014721 rG 09 42 52.952 -01 47 20.95           ~ 1 0
57 NVSS J094732-021509 rG 09 47 32.595 -02 15 10.25           ~ 1 0
58 NVSS J094814+061745 rG 09 48 14.128 +06 17 42.01           ~ 2 1
59 FIRST J094820.1-030847 Q? 09 48 20.144 -03 08 47.47           ~ 1 0
60 NVSS J095143-030910 rG 09 51 43.33024 -03 09 06.6190           ~ 1 0
61 NVSS J095511-030034 Rad 09 55 12.417 -03 00 31.68           ~ 1 0
62 NVSS J100133-022515 rG 10 01 33.054 -02 25 16.30           ~ 1 0
63 [GUL2013] J101741.40+074800.6 * 10 17 41.404 +07 48 00.41           ~ 1 0
64 FIRST J125805.7-001418 rG 12 58 05.673 -00 14 20.77           ~ 1 0
65 NVSS J131430+001336 rG 13 14 30.149 +00 13 40.75           ~ 1 0
66 NVSS J131910+000955 Rad 13 19 10.702 +00 09 55.61           ~ 6 1
67 FIRST J135033.4-002442 rG 13 50 33.546 -00 24 41.40           ~ 1 0
68 [GUL2013] J140643.69-001147.1 * 14 06 43.791 -00 11 47.53           ~ 1 0
69 [GUL2013] J153347.27+054150.9 * 15 33 47.207 +05 41 52.18           ~ 1 0
70 IC 1127 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 3090 4
71 FIRST J154246.5+053604 rG 15 42 46.526 +05 36 03.93           ~ 1 0
72 FIRST J154401.8+053451 rG 15 44 01.868 +05 34 51.51           ~ 1 0
73 NVSS J222055-005013 rG 22 20 55.622 -00 50 13.69           ~ 2 0
74 FIRST J222209.7-004421 rG 22 22 09.774 -00 44 21.07           ~ 2 0
75 FIRST J222517.8-001717 rG 22 25 17.792 -00 17 18.66           ~ 2 0
76 SDSS J223059.56+002209.2 QSO 22 30 59.563 +00 22 09.22           ~ 2 0
77 FIRST J223818.9+010509 Q? 22 38 19.000 +01 05 08.97           ~ 3 1
78 FIRST J224239.8-003847 rG 22 42 39.827 -00 38 47.85           ~ 2 0
79 FIRST J224338.0+001749 QSO 22 43 38.0414 +00 17 49.993           ~ 9 0
80 FIRST J224548.3-001456 rG 22 45 48.314 -00 14 56.32           ~ 2 0
81 [GUL2013] J225009.90+001041.0 Q? 22 50 09.943 +00 10 42.41           ~ 1 0
82 FIRST J225423.4+002758 rG 22 54 23.457 +00 27 57.90           ~ 2 0
83 SDSS J233452.45-002422.7 QSO 23 34 52.456 -00 24 22.73           ~ 1 0
84 FIRST J233454.4+001610 rG 23 34 54.438 +00 16 10.27           ~ 1 0
85 FIRST J233633.5-004957 rG 23 36 33.549 -00 49 56.83           ~ 1 0
86 [GUL2013] J233723.59-005811.3 Q? 23 37 23.596 -00 58 10.80           ~ 1 0
87 FIRST J233756.7-003222 rG 23 37 56.734 -00 32 22.91           ~ 1 0
88 FIRST J234015.2-001033 rG 23 40 15.270 -00 10 33.82           ~ 1 0

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