2000ApJ...529..859K

Query : 2000ApJ...529..859K

2000ApJ...529..859K - Astrophys. J., 529, 859-865 (2000/February-1)

Compact radio sources with the steepest spectra.

KAPLAN D.L., CORDES J.M., CONDON J.J. and DJORGOVSKI S.G.

Abstract (from CDS):

We used the 1.4 GHz NRAO VLA Sky Survey (NVSS) and 365 MHz Texas survey catalogs to select relatively compact (θ≤25'') radio sources having exceptionally steep spectral indices α≥1.5 (where the flux density Sν at frequency ν scales as Sν∝ν–α). Our sample of 74 sources (of ∼30,000 total sources common to both surveys) with S(365 MHz)≥200 mJy in the 10 sr between δ=-35°30' and δ=71°30' should be complete for spectra as steep as α=3.2, but we found only four sources with α>2.5. Most known sources with such steep spectra are pulsars (coherent radio sources), relic radio galaxies, and high-redshift radio galaxies (synchrotron sources with spectra steepened by radiation losses). In fact, six of our sources have been identified with known pulsars and one with a high-redshift (z=3.79) radio galaxy. In order to find possible new populations of steep-spectrum sources and classify the rest, we made VLA images of our sources with 1".5 and 0".5 resolution at 1.4 and 5 GHz, respectively. There are 25 doubles, 24 multicomponent sources, 16 unresolved (θ≲0".2) sources, and six known pulsars. Three sources have undetermined morphologies as they were not reobserved with the VLA. The smallest sources have exceptionally steep spectra for their angular sizes. New pulsars, if any, are likely to be of special interest since they are strong but were missed by pulse-detection surveys. Preliminary radio, infrared, and optical observations suggest that most are high-redshift extragalactic sources.

Abstract Copyright: ∼

Journal keyword(s): Catalogs - Galaxies: Active - Stars: Pulsars: General - Radio Continuum: Galaxies - Radio Continuum: Stars - Surveys

Simbad objects: 74

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Number of rows : 74
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 NVSS J000421-015015 Rad 00 04 21.887 -01 50 16.82           ~ 3 0
2 NVSS J000702+364152 Rad 00 07 02.8 +36 41 58           ~ 6 1
3 NVSS J014138-140608 Rad 01 41 37.5 -14 06 10           ~ 6 1
4 NVSS J020457+655529 Rad 02 04 57.5 +65 55 30           ~ 4 1
5 4C 62.05 Rad 02 11 53.7 +62 23 15           ~ 6 1
6 NVSS J022939+614627 Rad 02 29 38.9 +61 46 22           ~ 3 1
7 TXS 0240+210 Rad 02 42 56.42 +21 14 54.1           ~ 2 0
8 NVSS J030639-330432 Rad 03 06 39.5 -33 04 29           ~ 9 1
9 NVSS J031054+364401 Rad 03 10 54.9 +36 44 02           ~ 4 1
10 PSR B0329+54 Psr 03 32 59.3370698592 +54 34 45.028206408           ~ 645 1
11 4C 04.14 rG 03 55 12.8 +04 40 41           ~ 11 1
12 8C 0409+620 Rad 04 14 03.2 +62 08 39           ~ 4 1
13 NVSS J043335-290601 rG 04 33 35.7 -29 06 02           ~ 9 1
14 2MASX J04463758-0421033 G 04 46 37.5896120592 -04 21 03.157652556           ~ 5 1
15 4C 60.07 rG 05 12 55.1 +60 30 53           ~ 90 1
16 TXS 0519+315 Rad 05 22 33.33 +31 33 30.3           ~ 2 0
17 GLEAM J060457-201556 Rad 06 04 57.8 -20 15 55           ~ 6 1
18 PSR B0628-28 Psr 06 30 49.3710 -28 34 42.200           ~ 295 0
19 NVSS J074729+365438 rG 07 47 29.4 +36 54 38           ~ 20 1
20 NVSS J082751-130339 Rad 08 27 51.4 -13 03 42           ~ 2 0
21 NVSS J085753-302633 Rad 08 57 53.2 -30 26 36           ~ 4 1
22 NVSS J090200+180903 Rad 09 01 59.78 +18 09 02.2           ~ 6 1
23 NVSS J091034-222843 Rad 09 10 34.3 -22 28 45           ~ 10 1
24 TXS 0936+039 Rad 09 39 12.4 +03 44 02           ~ 2 0
25 NVSS J095408+142425 Rad 09 54 08.7 +14 24 25           ~ 3 0
26 TXS 1001+052 Rad 10 03 54.94 +05 01 24.5           ~ 2 0
27 7C 1040+2420 BiC 10 43 43.309 +24 04 46.80           ~ 13 1
28 TXS 1051+048 Rad 10 53 45.52 +04 33 45.6           ~ 2 0
29 6C 1125+4839 AGN 11 28 05.2 +48 22 57           ~ 7 1
30 TXS 1133+161 Rad 11 36 03.34 +15 50 59.1           ~ 2 0
31 NVSS J113733-353713 Rad 11 37 33.0 -35 37 25           ~ 4 1
32 NVSS J115159-301341 Rad 11 51 59.5 -30 13 41           ~ 7 1
33 TXS 1211+022 Rad 12 13 53.7 +01 55 59           ~ 2 0
34 NVSS J122452+543639 Rad 12 24 52.2 +54 36 40           ~ 5 1
35 TXS 1223+130 Rad 12 26 12.25 +12 48 48.0           ~ 2 0
36 8C 1340+568 Rad 13 42 31.14 +56 36 46.4           ~ 3 1
37 NVSS J134902-204911 Rad 13 49 02.5 -20 49 08           ~ 3 0
38 NVSS J142003+673509 Rad 14 20 03.1 +67 35 10           ~ 5 1
39 7C 1447+2507 Rad 14 49 50.06 +24 55 10.0           ~ 2 0
40 TXS 1541-048 Rad 15 44 04.90 -05 02 46.2           ~ 2 0
41 TXS 1548-102 Rad 15 51 30.7 -10 24 41           ~ 2 0
42 NVSS J160459-024847 Rad 16 04 59.5 -02 48 49           ~ 5 1
43 NVSS J162819+160400 Rad 16 28 19.2 +16 04 00           ~ 5 1
44 NVSS J163744-193122 Rad 16 37 44.6 -19 31 26           ~ 7 0
45 NVSS J164318-345220 Rad 16 43 18.6 -34 52 23           ~ 3 0
46 PSR B1642-03 Psr 16 45 02.0330 -03 17 57.200           ~ 363 0
47 NVSS J172704-320524 Rad 17 27 05.1 -32 05 25           ~ 4 1
48 NVSS J172912-315931 Rad 17 29 12.5 -31 59 29           ~ 4 1
49 NVSS J173146+464002 Rad 17 31 46.6 +46 40 02           ~ 4 1
50 NVSS J173406-320454 Rad 17 34 06.4 -32 04 53           ~ 6 1
51 PSR B1749-28 Psr 17 52 58.7130 -28 06 33.900           ~ 261 0
52 GPSR 031.571+0.637 Rad 18 46 41.39 -00 55 13.7           ~ 3 0
53 NVSS J192413+320136 Rad 19 24 14.1 +32 01 35           ~ 3 0
54 NVSS J192841+030301 Rad 19 28 41.4 +03 03 02           ~ 3 0
55 PSR B1929+10 Psr 19 32 14.0570 +10 59 33.380           ~ 753 0
56 4C 10.60 Rad 19 50 55.4 +10 25 15           ~ 5 1
57 TXS 2011-188 Rad 20 14 52.1 -18 43 24           ~ 2 0
58 NVSS J202117+082319 Rad 20 21 17.7 +08 23 15           ~ 3 0
59 4C 36.40 Rad 20 29 25.6 +36 43 23           ~ 8 1
60 NVSS J202937+415141 Rad 20 29 36.5 +41 51 41           ~ 4 0
61 NVSS J202949-085848 Rad 20 29 49.7 -08 58 51           ~ 4 0
62 TXS 2050-061 Rad 20 52 49.86 -05 55 49.2           ~ 3 0
63 TXS 2058-004 Rad 21 01 18.15 -00 16 18.8           ~ 2 0
64 NVSS J210826+024946 Rad 21 08 26.8 +02 49 48           ~ 4 0
65 NVSS J214510+584311 Rad 21 45 10.4 +58 43 11           ~ 4 1
66 NVSS J221154+680220 Rad 22 11 55.1 +68 02 24           ~ 4 1
67 NVSS J221451+144237 Rad 22 14 51.5 +14 42 38           ~ 4 1
68 NVSS J221939-042615 Rad 22 19 39.2 -04 26 16           ~ 3 0
69 NVSS J222215+330544 Rad 22 22 15.2 +33 05 43           ~ 6 1
70 TXS 2225-171 Rad 22 28 00.2 -16 52 27           ~ 2 0
71 NVSS J223144+171451 Rad 22 31 44.4 +17 14 51           ~ 3 0
72 TXS 2307+587 Rad 23 10 01.38 +59 01 18.3           ~ 2 0
73 NVSS J231456+205338 Rad 23 14 56.0 +20 53 37           ~ 5 0
74 NVSS J234858+543544 Rad 23 48 58.6 +54 35 43           ~ 4 1

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