2012AJ....144..124Y

Query : 2012AJ....144..124Y

2012AJ....144..124Y - Astron. J., 144, 124 (2012/October-0)

Invisible active galactic nuclei. I. Sample selection and Optical/Near-IR spectral energy distributions.

YAN T., STOCKE J.T., DARLING J. and HEARTY F.

Abstract (from CDS):

In order to find more examples of the elusive high-redshift molecular absorbers, we have embarked on a systematic discovery program for highly obscured, radio-loud "invisible active galactic nuclei" using the Very Large Array Faint Images of the Radio Sky at Twenty centimeters radio survey in conjunction with the Sloan Digital Sky Survey (SDSS) to identify 82 strong ( ≥ 300 mJy) radio sources positionally coincident with late-type, presumably gas-rich galaxies. In this first paper, the basic properties of this sample are described including the selection process and the analysis of the spectral energy distributions (SEDs) derived from the optical (SDSS) + near-IR (NIR) photometry obtained by us at the Apache Point Observatory 3.5 m. The NIR images confirm the late-type galaxy morphologies found by SDSS for these sources in all but a few (6 of 70) cases (12 previously well studied or misclassified sources were culled). Among 70 sources in the final sample, 33 show galaxy type SEDs, 17 have galaxy components to their SEDs, and 20 have quasar power-law continua. At least nine sources with galaxy SEDs have K-band flux densities too faint to be giant ellipticals if placed at their photometric redshifts. Photometric redshifts for this sample are analyzed and found to be too inaccurate for an efficient radio-frequency absorption line search; spectroscopic redshifts are required. A few new spectroscopic redshifts for these sources are presented here but more will be needed to make significant progress in this field. Subsequent papers will describe the radio continuum properties of the sample and the search for redshifted H I 21 cm absorption.

Abstract Copyright: ∼

Journal keyword(s): galaxies: photometry - infrared: galaxies - quasars: absorption lines

CDS comments: p.2: PMN J0134-0934 is a probable misprint for PMN J0134-0931.

Simbad objects: 86

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Number of rows : 86
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 PKS J0000-1054 Rad 00 00 57.657 -10 54 32.12           ~ 7 1
2 PKS 0001-111 QSO 00 03 56.302 -10 53 02.43           ~ 5 1
3 QSO B0131-001 QSO 01 34 12.70415461 +00 03 45.1386194   23.34 22.50 20.780   ~ 43 1
4 QSO B0132-097 QSO 01 34 35.6657627616 -09 31 02.903742300   24.52 22.70 20.80   ~ 113 2
5 6C 021803+354230 BLL 02 21 05.4920852208 +35 56 13.848581904   20.0 20.0 19.60   ~ 603 3
6 Cul 0247-082 Q? 02 49 35.373 -07 59 21.44           ~ 8 1
7 7C 073304.20+300107.00 Q? 07 36 13.66108615 +29 54 22.1849189           ~ 24 1
8 4C 46.16 QSO 07 47 43.5236 +46 18 57.384           ~ 34 1
9 SDSS J074948.75+212932.9 G 07 49 48.752 +21 29 32.93           ~ 5 1
10 QSO J0751+2716 QSO 07 51 41.517 +27 16 31.79     18.7     ~ 86 2
11 6C 075514+532100 Q? 07 59 06.534 +53 12 47.58           ~ 4 1
12 87GB 080210.3+162232 Q? 08 05 02.186 +16 14 04.90           ~ 13 2
13 6C 080349+533625 QSO 08 07 40.745 +53 27 39.57           ~ 4 1
14 6C 082036+542337 Q? 08 24 25.481 +54 13 48.85           ~ 4 1
15 3C 202 Rad 08 34 48.223 +17 00 42.43   19.5       ~ 31 1
16 4C 24.18 Q? 08 39 57.903 +24 03 11.46   19       ~ 15 1
17 ICRF J084331.6+421529 G 08 43 31.63747041 +42 15 29.5243582           ~ 38 1
18 SDSS J090150.96+030423.0 G 09 01 50.966 +03 04 23.00     19.0     ~ 12 1
19 4C 50.28 QSO 09 03 49.910 +50 12 35.73           ~ 16 1
20 6C 090206+414045 Q? 09 05 22.1891 +41 28 39.559   19.5       ~ 17 1
21 4C 04.30 G 09 07 50.745 +04 13 37.38   20.0       ~ 7 1
22 4C 24.19 QSO 09 10 22.555 +24 19 19.58           ~ 17 1
23 87GB 091231.7+103057 Q? 09 15 12.954 +10 18 27.42           ~ 4 1
24 4C 47.30 Q? 09 17 27.156 +47 25 25.39           ~ 5 1
25 4C 18.29 G 09 20 11.125 +17 53 24.75   19.5       ~ 16 1
26 7C 091749.1+272654 G 09 20 45.048 +27 14 06.73     17.8     ~ 9 1
27 SDSS J093945.16+030426.4 G 09 39 45.166 +03 04 26.45           ~ 12 1
28 9C J0945+2640 QSO 09 45 30.972 +26 40 52.91       20.90   ~ 8 1
29 SDSS J095133.84+115459.7 G 09 51 33.848 +11 54 59.79           ~ 5 1
30 7C 1005+2415 Q? 10 08 32.627 +24 01 19.62           ~ 7 1
31 6C 100723+421413 G 10 10 24.7808 +41 59 33.022           ~ 14 1
32 51P 126 QSO 10 19 48.1843 +44 08 24.845           ~ 14 1
33 SDSS J102337.55+042413.9 G 10 23 37.552 +04 24 13.96           ~ 4 1
34 7C 1030+3951 Bla 10 33 22.06099343 +39 35 51.0830059   19.55 19.06 21.17   ~ 52 1
35 4C 11.35 Q? 10 34 05.082 +11 12 31.56   19.5       ~ 17 2
36 4C 05.45 rG 10 43 40.258 +05 37 12.57   19.5 19.5     ~ 13 1
37 87GB 104315.5+051115 QSO 10 45 51.750 +04 55 51.16           ~ 6 1
38 7C 104545.79+351316.00 QSO 10 48 34.2449674944 +34 57 24.874781184           ~ 52 1
39 3C 256 rG 11 20 43.022 +23 27 55.21   21.5       ~ 123 1
40 4C 20.25A QSO 11 25 55.227 +19 53 44.12           ~ 7 1
41 6C 112454+575949 QSO 11 27 43.761 +57 43 15.60           ~ 12 1
42 SDSS J112904.11+563844.1 AGN 11 29 04.114 +56 38 44.11           ~ 6 2
43 SDSS J114206.38+023533.5 G 11 42 06.384 +02 35 33.59           ~ 5 1
44 4C 48.33 QSO 11 47 52.274 +48 18 49.53           ~ 13 1
45 SDSS J114825.43+140449.3 AGN 11 48 25.436 +14 04 49.36           ~ 6 1
46 87GB 120019.9+122410 Q? 12 02 52.093 +12 07 20.67           ~ 4 1
47 NVSS J120331+463255 rG 12 03 31.7958 +46 32 55.562           ~ 23 1
48 4C 54.26 G 12 07 14.137 +54 07 54.42           ~ 5 1
49 4C 17.54 QSO 12 15 14.72006420 +17 30 02.2543564   20.0       ~ 26 1
50 4C 54.28 Q? 12 28 50.610 +53 48 01.47           ~ 9 1
51 SDSS J123819.26+084500.4 G 12 38 19.268 +08 45 00.47           ~ 5 1
52 6C 125828+504542 Bla 13 00 41.24705472 +50 29 36.7653578       21.29   ~ 45 1
53 SDSS J131235.23+171055.8 G 13 12 35.232 +17 10 55.80           ~ 4 2
54 SDSS J131516.93+022221.1 G 13 15 16.934 +02 22 21.12           ~ 5 1
55 4C 10.36 QSO 13 41 04.360 +10 32 07.36   20.5       ~ 10 1
56 4C 59.20 Q? 13 45 38.322 +58 46 54.40           ~ 8 1
57 PKS 1345+12 Sy2 13 47 33.36161873 +12 17 24.2398927   19.28 18.44 15.718   ~ 652 2
58 4C 24.28 rG 13 48 14.890 +24 15 50.34     17.7     ~ 48 1
59 Z 162-21 BLL 13 52 17.8719816576 +31 26 46.487381604   16.10 15.10     ~ 502 3
60 4C 57.23 G 13 54 00.088 +56 50 05.07           ~ 10 1
61 PKS 1355+01 Q? 13 57 53.718 +00 46 33.39           ~ 22 1
62 NVSS J141036+485040 rG 14 10 36.039 +48 50 40.41           ~ 5 1
63 NGC 5506 Bla 14 13 14.8761010056 -03 12 27.556909272   15.25 14.38     ~ 1173 1
64 FIRST J141341.6+150939 Q? 14 13 41.6607 +15 09 39.515           ~ 13 1
65 ICRF J141414.8+455448 Sy2 14 14 14.8497 +45 54 48.730           ~ 41 1
66 QSO B1413+135 BLL 14 15 58.81751033 +13 20 23.7128587   21.055 20.000 18.461   ~ 476 1
67 4C -02.60 rG 14 21 13.543 -02 46 45.96           ~ 7 1
68 4C 19.47 QSO 14 24 09.711 +18 52 53.52           ~ 6 1
69 7C 150038.10+380535.00 QSO 15 02 34.777 +37 53 53.02       20.50   ~ 9 1
70 7C 150258.89+601232.00 QSO 15 04 09.2287106664 +60 00 55.356882696     18.00     ~ 41 1
71 6C 150325+545008 AGN 15 04 51.1859 +54 38 39.598           ~ 9 1
72 6C 150412+374224 Bla 15 06 09.52997529 +37 30 51.1325012   21.2 21.2 20.60   ~ 213 1
73 4C 13.54 QSO 15 23 21.786 +13 32 29.82     15.5     ~ 7 1
74 6C 152552+332346 G 15 27 50.889 +33 12 52.93           ~ 4 1
75 BWE 1525-0202 AG? 15 28 22.0437 -02 13 19.062           ~ 6 1
76 PMN J1548+0808 rG 15 48 09.058 +08 08 34.72           ~ 4 1
77 SDSS J155128.21+640537.5 Q? 15 51 28.21632 +64 05 37.5539           ~ 7 0
78 4C 43.36 QSO 15 59 31.210 +43 49 16.68           ~ 16 1
79 7C 160338.39+605903.00 G 16 04 27.400 +60 50 55.40           ~ 7 1
80 SDSS J161638.32+264701.3 G 16 16 38.327 +26 47 01.34           ~ 13 1
81 4C 41.32 Bla 16 25 57.66971273 +41 34 40.6292008     22 21.73   ~ 171 1
82 4C 13.60 Rad 16 29 48.424 +13 42 05.70           ~ 4 2
83 4C 47.43 QSO 16 33 15.018 +47 00 16.89           ~ 5 1
84 7C 172219.89+385505.00 QSO 17 24 00.536 +38 52 26.73           ~ 4 1
85 QSO B1830-211 Bla 18 33 39.9399138048 -21 03 39.368838780     18.70 21   ~ 724 1
86 4C -00.79 QSO 22 03 58.309 -00 21 47.91           ~ 12 1

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