2001AJ....121.1241D

Query : 2001AJ....121.1241D

2001AJ....121.1241D - Astron. J., 121, 1241-1265 (2001/March-0)

Spectroscopy of ultra-steep-spectrum radio sources.

DE BREUCK C., VAN BREUGEL W., ROETTGERING H., STERN D., MILEY G., DE VRIES W., STANFORD S.A., KURK J. and OVERZIER R.

Abstract (from CDS):

We present optical spectroscopy of 62 objects selected from several samples of ultra-steep-spectrum radio sources. Forty-six of these are from our primary catalog, consisting of 669 sources with radio spectral indices α←1.30 (Sν∝να); this first spectroscopic subsample was selected on the basis of their faint optical and near-IR identifications. Most are identified as narrow-lined radio galaxies with redshifts ranging from z=0.25 to z=5.19. Ten objects are at z>3, nearly doubling the number of such sources known to date. Four of the USS radio sources are identified with quasars, of which at least three have very red spectral energy distributions. The source TN J0936-2242 is identified with an extremely red object (ERO, R-K>5); both it and a close companion are at z=1.479. The spectrum of the ERO closely resembles that of previously discovered radio galaxies at z∼1.5. Five sources show continuum emission, but fail to show any clear emission or absorption features, despite integrations of ∼1 hr with the Keck telescope. We suggest that these objects could be (1) radio galaxies with faint emission lines in the ``redshift desert'' at 1.5≲z≲2.3, (2) radio galaxies with an obscured active galactic nucleus, which are dominated by a stellar continuum observed with an insufficient signal-to-noise ratio, or (3) pulsars. Three radio sources identified with faint objects in the K-band images remain undetected in 50-90 minute spectroscopic integrations with the Keck telescope, and are possible z>7 candidates.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Active - Galaxies: Distances and Redshifts - Stars: Pulsars: General - Radio Continuum - Surveys

Simbad objects: 58

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Number of rows : 58
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 [RLM94] 0003-019 rG 00 06 -01.6           ~ 6 0
2 [DVR2000] WN J0040+3857 rG 00 40 56.23 +38 57 30.0           ~ 9 0
3 NVSS J012142+132058 Rad 01 21 42.7 +13 20 58           ~ 37 0
4 NVSS J013706+252119 rG 01 37 06.8 +25 21 19           ~ 7 1
5 NVSS J014343+325349 rG 01 43 43.85 +32 53 49.7         24 ~ 37 1
6 NVSS J020510+224250 Rad 02 05 10.6 +22 42 50           ~ 29 1
7 NVSS J023111+360027 rG 02 31 11.8 +36 00 28         25.0 ~ 14 1
8 NVSS J030326+373341 rG 03 03 26.1 +37 33 41           ~ 12 1
9 [DVR2000] WN J0310+3644 Rad 03 10 54.80 +36 44 02.5           ~ 3 0
10 NVSS J040234+100715 Rad 04 02 34.5 +10 07 15           ~ 4 0
11 NVSS J045226-173752 rG 04 52 26.5 -17 37 54           ~ 10 1
12 NVSS J051616+063718 Rad 05 16 16.2 +06 37 18           ~ 2 0
13 NVSS J051736-064113 Rad 05 17 36.6 -06 41 14           ~ 4 0
14 [DVR2000] WN J0617+5012 rG 06 17 39.37 +50 12 54.7           ~ 15 0
15 7C 071418.69+461704.00 QSO 07 17 58.5 +46 11 38     21.60     ~ 13 1
16 NVSS J074729+365438 rG 07 47 29.4 +36 54 38           ~ 20 1
17 FIRST J081338.0+482841 Rad 08 13 38.1 +48 28 42           ~ 5 0
18 NVSS J091034-222843 Rad 09 10 34.3 -22 28 45           ~ 10 1
19 NVSS J092022-071217 rG 09 20 22.4 -07 12 18       22.4   ~ 16 0
20 GLEAM J092419-220140 QSO 09 24 19.92000 -22 01 41.4984       25.850   ~ 88 0
21 NVSS J093632-224303 Rad 09 36 32.5 -22 43 04           ~ 4 0
22 [DVR2000] TN J0941-1628 rG 09 41 07.43 -16 28 02.5           ~ 10 0
23 [DVR2000] WN J1015+3038 Rad 10 15 08.92 +30 38 02.0           ~ 4 0
24 NVSS J102622-211607 Rad 10 26 22.4 -21 16 06           ~ 6 1
25 NVSS J103310-133952 rG 10 33 10.7 -13 39 54           ~ 12 0
26 NVSS J110247-165134 Rad 11 02 47.0 -16 51 34           ~ 12 1
27 NVSS J111223-294807 Rad 11 12 23.9 -29 48 06           ~ 11 0
28 NVSS J111506+501624 rG 11 15 06.9 +50 16 24           ~ 17 1
29 NVSS J112310-215405 rG 11 23 10.2 -21 54 04           ~ 12 1
30 B2 1121+31 B Rad 11 23 55.85 +31 41 26.1           ~ 20 0
31 NVSS J115159-301341 Rad 11 51 59.5 -30 13 41           ~ 7 1
32 NVSS J115953-162948 Rad 11 59 52.9 -16 29 47           ~ 5 1
33 NVSS J124252+391546 rG 12 42 52.7 +39 15 45           ~ 12 1
34 [DVR2000] WN J1314+3649 Rad 13 14 17.86 +36 49 14.6           ~ 3 0
35 [DVR2000] WN J1333+3037 Rad 13 33 21.20 +30 37 35.1           ~ 4 0
36 NVSS J133814+353206 rG 13 38 14.9 +35 32 09           ~ 13 1
37 [DBC2004] M03 rG 13 38 26.05 -19 42 30.5       22.4   ~ 99 0
38 PKS J1428-1502 Rad 14 28 42.0 -15 02 31           ~ 6 1
39 [DVR2000] WN J1525+3010 Rad 15 25 01.21 +30 10 30.2           ~ 3 0
40 NVSS J154329+351227 Rad 15 43 29.3 +35 12 30           ~ 4 0
41 PMN J1650+0955 rG 16 50 05.2 +09 55 09           ~ 13 1
42 PMN J1755-6916 rG 17 55 29.6 -69 16 51           ~ 13 1
43 PKS 1753-676 rG 17 58 51.5 -67 38 34           ~ 13 1
44 [DVR2000] WN J1836+5210 Rad 18 36 23.22 +52 10 28.4           ~ 3 0
45 NAME TX J1908+7220 rG 19 08 23.3 +72 20 11           ~ 55 1
46 NVSS J191149+634209 Rad 19 11 49.5 +63 42 09           ~ 16 1
47 WN B1917+6630 Rad 19 17 35.50 +66 35 38.5           ~ 3 0
48 PKS J1929-3732 Rad 19 29 08.4 -37 32 50           ~ 6 1
49 NVSS J195424-120749 Rad 19 54 24.4 -12 07 49           ~ 6 1
50 PMN J2003-8340 Rad 20 03 30.91 -83 40 59.5           ~ 6 0
51 4C 02.51 rG 20 36 34.8 +02 56 54           ~ 15 1
52 [DVR2000] WN J2044+7044 Rad 20 44 57.80 +70 44 03.8           ~ 3 0
53 PKS 2041-60 Rad 20 45 20.4 -60 19 02           ~ 18 1
54 PMN J2048-5750 Rad 20 48 36.63 -57 50 47.4           ~ 7 1
55 [VV2006] J231306.4+405340 QSO 23 13 06.1696990464 +40 53 38.956753968     18.80     ~ 7 0
56 NVSS J232142+223752 rG 23 21 42.2 +22 37 52           ~ 7 1
57 NVSS J233458+154549 rG 23 34 58.4 +15 45 50           ~ 11 1
58 NAME TXS J2355-0002 rG 23 55 35.9 -00 02 48           ~ 22 2

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