2000A&A...361..480D

Query : 2000A&A...361..480D

2000A&A...361..480D - Astronomy and Astrophysics, volume 361480-490 (2000/9-2)

Flat radio-spectrum galaxies and BL Lacs. I. Core properties.

DENNETT-THORPE J. and MARCHA M.J.

Abstract (from CDS):

This paper concerns the relationship of BL Lacs and flat-spectrum weak emission-line galaxies. We compare the weak emission-line galaxies and the BL Lacs in a sample of 57 flat-spectrum objects (Marcha et al., 1996MNRAS.281..425M), using high-frequency radio and non-thermal optical flux densities, spectral indices and polarization properties. We consider whether objects which are not `traditional' BL Lacs - due to their larger emission line strengths, and larger CaII spectral breaks - are simply starlight diluted BL Lacs. Their broad-band spectral properties are consistent with this interpretation, but their radio polarization may indicate more subtle effects. Comparison of the weak emission-line galaxies and the BL Lacs shows that, on average, the former have steeper spectra between 8 and 43GHz, and are less polarized at 8.4GHz. This is consistent with many of the weak-lined objects being at larger angles to the line of sight than the BL Lacs. In addition to this population, we indicate a number of the weak emission-line galaxies which may be `hidden BL Lacs': relativistically boosted objects very close to the line of sight with an apparently weak AGN.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - galaxies: BL Lacertae objects: general - galaxies: jets - galaxies: nuclei - radio continuum: galaxies

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 - 2026 		#notes
1 NVSS J003808+230327 rG 00 38 08.1024 +23 03 28.440           ~ 35 1
2 NGC 262 Bla 00 48 47.14147900 +31 57 25.0845702 14.04 13.90 13.06 8.53   ~ 778 2
3 NGC 315 LIN 00 57 48.88334410 +30 21 08.8119345 12.80 12.20 11.16 11.26   ~ 869 2
4 QSO B0109+224 BLL 01 12 05.8247044608 +22 44 38.785880796   16.00 15.66 15.47   ~ 373 2
5 Z 502-27 rG 01 19 35.00087601 +32 10 50.0619670   16 14.5     ~ 249 1
6 ICRF J012808.0+490105 Bla 01 28 08.06338971 +49 01 05.9855846     17.2 12.11   ~ 42 1
7 8C 0149+710 BLL 01 53 25.85101910 +71 15 06.4633311     15.50     ~ 105 1
8 RX J0214.2+5144 BLL 02 14 17.9358553848 +51 44 51.945795816       16.5   ~ 133 1
9 [VV96] J025442.6+393134 Bla 02 54 42.6319794672 +39 31 34.711675284     16.30 16.91   ~ 73 2
10 QSO B0309+411 Bla 03 13 01.96212044 +41 20 01.1834497   18.0   14.59   ~ 178 1
11 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
12 6C 032130+340016 BLL 03 24 41.1612813408 +34 10 45.857918460     15.72 13.1   ~ 314 1
13 7C 065109.30+425147.00 BLL 06 54 43.5253496568 +42 47 58.730753904     17.00 14.9   ~ 48 1
14 Z 204-27 QSO 06 55 10.02472583 +41 00 10.1602339   14.6   9.37   ~ 71 1
15 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 15.50 14.27   ~ 1388 1
16 NVSS J073328+560541 rG 07 33 28.6148 +56 05 41.730           ~ 32 1
17 Z 286-39 Bla 07 37 30.08694371 +59 41 03.1947899   15.5   11.8   ~ 67 1
18 RX J0809.6+3455 BLL 08 09 38.8872832824 +34 55 37.248843504   18.38 17.42 12.6   ~ 112 1
19 Z 332-26 rG 08 53 18.89689858 +68 28 19.0131937   14.8       ~ 31 1
20 6C 090251+464619 Bla 09 06 15.53979871 +46 36 19.0241852   16.80 16.08     ~ 63 1
21 Ton 397 BLL 09 15 52.4015550384 +29 33 24.042671532   16.79 16.39 16.085   ~ 238 1
22 RX J1058.6+5628 BLL 10 58 37.7276569824 +56 28 11.207405028   16.80 16.31 14.58   ~ 232 1
23 Z 184-50 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2841 1
24 4C 20.25 BLL 11 25 58.7421679224 +20 05 54.337332372   18.55 17.96     ~ 59 1
25 Z 334-43 BLL 11 36 26.4090783600 +70 09 27.309071232   15.16 14.49 10.51   ~ 394 1
26 Z 186-48 BLL 11 47 22.1297825184 +35 01 07.538786184   17.89 16.83 10.26   ~ 184 1
27 NGC 3894 Bla 11 48 50.35817663 +59 24 56.3822416   12.9   11.57   ~ 268 1
28 7C 1147+2434 BLL 11 50 19.21218244 +24 17 53.8352318   16.26 15.74 15.80   ~ 294 1
29 Ton 605 HB* 12 16 53.6748432768 +30 04 08.692883544   16.110 15.98     B 223 0
30 RX J1217.8+3007 BLL 12 17 52.0819904040 +30 07 00.634936872   16.07 15.62 13.47   G7 516 1
31 NGC 4278 LIN 12 20 06.8242 +29 16 50.722 11.54 11.09 10.16     ~ 988 2
32 7C 1219+2830 BLL 12 21 31.6904439888 +28 13 58.500308172   16.81 16.11 14.24   ~ 924 1
33 NVSS J124310+731600 rG 12 43 11.21710248 +73 15 59.2498613           ~ 35 1
34 ICRF J124733.3+672316 Bla 12 47 33.32959326 +67 23 16.4488689           ~ 100 2
35 Z 294-4 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 2096 3
36 Mrk 668 BLL 14 07 00.39441712 +28 27 14.6901341   16.13 15.35 10.29   ~ 826 3
37 6C 141804+543700 BLL 14 19 46.5974051952 +54 23 14.787857796   16.17 15.65 14.16   ~ 630 1
38 6C 142125+510933 Bla 14 23 14.1852096840 +50 55 37.285758732   18.25 17.88 14.93   ~ 96 1
39 PG 1424+240 BLL 14 27 00.3917926224 +23 48 00.037510776 14.52 14.34 14.95 14.5   ~ 420 1
40 IC 1127 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 3090 4
41 4C 23.42 Sy2 15 53 43.5914760192 +23 48 25.450188912     17.0     ~ 58 1
42 MCG+10-23-012 QSO 15 59 01.7039 +59 24 21.841   16       ~ 48 1
43 7C 164526.30+291456.00 BLL 16 47 26.8766288160 +29 09 49.574194524   16.5   13.4   ~ 24 1
44 7C 164616.60+495503.00 BLL 16 47 34.9117576933 +49 50 00.584303604     17 12.47   ~ 119 1
45 Z 225-7 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2304 2
46 4C 30.31 rG 17 00 45.2320367856 +30 08 12.874902000   15.00 14.3     ~ 76 0
47 2MASX J17052935+2216075 Sy2 17 05 29.3298316080 +22 16 07.585741884           ~ 32 1
48 ICRF J174648.2+260320 BLL 17 46 48.2793534480 +26 03 20.362096440   17.0       ~ 26 1
49 NGC 6521 Bla 17 55 48.4316054256 +62 36 44.129200428   14.3   9.3   ~ 75 1
50 Z 340-35 BLL 18 06 50.6802916920 +69 49 28.109609256   14.77 14.22 11.39   ~ 909 1
51 QSO B1959+650 BLL 19 59 59.8520303688 +65 08 54.652536492     12.8 11.21   ~ 699 2
52 ICRF J211401.1+820448 Bla 21 14 01.1713534464 +82 04 48.340509096           ~ 141 1
53 ICRF J220421.1+363237 QSO 22 04 21.10050784 +36 32 37.0908847       12.88   ~ 33 1
54 87GB 221452.8+200953 BLL 22 17 15.9 +20 24 45           ~ 6 1
55 ICRF J221949.7+261327 Bla 22 19 49.7415736248 +26 13 27.931550772       17.00   ~ 59 1
56 ICRF J232154.9+320407 Bla 23 21 54.95598750 +32 04 07.6225103     18 20   ~ 115 1
57 Z 454-57 rG 23 23 20.3442252816 +20 35 23.535199932   15.5 15.5     ~ 47 1
58 NGC 7728 rG 23 40 00.83890 +27 08 01.3730   14.3       ~ 113 1

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