2002MNRAS.336..945L


Query : 2002MNRAS.336..945L

2002MNRAS.336..945L - Mon. Not. R. Astron. Soc., 336, 945-956 (2002/November-1)

The classification of BL Lacertae objects: the Ca H&K break.

LANDT H., PADOVANI P. and GIOMMI P.

Abstract (from CDS):

We investigate why BL Lacertae objects (BL Lacs) have values of the Ca H&K break (a stellar absorption feature) lower than low-power radio galaxies, and whether its use is justified to separate the two classes. For this purpose we relate this parameter to the radio and optical core emission, as well as to the X-ray powers, for a sample of ∼90 radio sources. We find that the Ca H&K break value decreases with increasing jet power, and that it also anticorrelates with the radio core dominance parameter but not with extended radio emission. Based on this we conclude that the Ca H&K break value of BL Lacs and radio galaxies is a suitable indicator of orientation. From the luminosity ratios between objects with low and high Ca H&K break values we constrain the average Lorentz factors for BL Lacs and low-power radio galaxies in the radio and X-ray band to Γ∼ 2 -4 and derive average viewing angles for the galaxies. Our values are in agreement with results from independent methods. We find that the correlations between Ca H&K break and radio core and X-ray luminosity hold independently for low- (LBL) and high-energy peaked BL Lacs (HBL). We derive average viewing angles for their parent populations, which turn out to be similar to the ones for our entire sample, and compare for the first time the luminosities of LBL and HBL at different orientations.

Abstract Copyright: RAS

Journal keyword(s): BL Lacertae objects: general.

Simbad objects: 93

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Number of rows : 93
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ClG 0011.7+0837 ClG 00 14 21.1 +08 54 11     17.5     ~ 24 0
2 2dFGRS TGS283Z129 BLL 00 32 33.0970812456 -28 49 20.390589480   18.723 18.80 17.242   ~ 29 0
3 NGC 315 LIN 00 57 48.8590525608 +30 21 08.842041360 12.80 12.20 11.16 11.26   ~ 751 2
4 LEDA 3087886 BLL 01 10 04.8120900624 +41 49 50.731434480     17.60 14   ~ 32 1
5 4C 31.04 rG 01 19 34.9816472856 +32 10 50.119481928   16 14.5     ~ 225 1
6 QSO B0118-272 BLL 01 20 31.6628068344 -27 01 24.636341064   15.89 15.56 15.49   ~ 253 1
7 4FGL J0123.1+3421 BLL 01 23 08.6375580816 +34 20 48.664188060     15.2 16.8   ~ 105 1
8 QSO B0122+09 BLL 01 24 44.5398641328 +09 18 49.289559588     19.98 18.5   ~ 57 0
9 QSO B0138-097 BLL 01 41 25.8320610024 -09 28 43.676872212   16.94 16.55 17.21   ~ 255 3
10 LEDA 174300 BLL 01 52 39.6109440384 +01 47 17.385104112     15.12 11.8   ~ 120 1
11 8C 0149+710 BLL 01 53 25.8498764616 +71 15 06.461433756     15.50     ~ 75 1
12 QSO B0158+001 BLL 02 01 06.1794930072 +00 34 00.135789564   18.99 18.42 18   ~ 97 0
13 ICRF J021417.9+514451 BLL 02 14 17.9358553848 +51 44 51.945795816     16.50 16.5   ~ 94 1
14 QSO B0218+357 QSO 02 21 05.4920852208 +35 56 13.848581904   20.0 20.0 19.60   ~ 530 3
15 QSO B0229+200 BLL 02 32 48.6148874688 +20 17 17.486717388   18.0 18.00     ~ 290 3
16 QSO B0257+34 BLL 03 01 03.7549027896 +34 41 01.078942128     18.53     ~ 63 0
17 2MASX J03140275+2444334 SyG 03 14 02.7340832016 +24 44 32.804176128     18.3     ~ 25 0
18 QSO B0317+18 BLL 03 19 51.8082475320 +18 45 34.562475432     18.12     ~ 197 0
19 NVSS J034048-181400 AGN 03 40 48.00 -18 14 00.1     19.6     ~ 7 1
20 QSO B0419+19 BLL 04 22 18.6125654952 +19 50 46.908625740       18.6   ~ 75 0
21 2MASX J04285086-3805503 BLL 04 28 50.8440888600 -38 05 50.439578784     18.90 15.6   ~ 13 0
22 QSO B0502+675 BLL 05 07 56.1631660632 +67 37 24.225299292     17.0 17.2   ~ 160 1
23 2MASS J05283471-5820180 BLL 05 28 34.6838447592 -58 20 18.332413512     19.20 16.3   ~ 13 0
24 QSO B0607+710 BLL 06 13 43.3821991056 +71 07 26.779488276   19.6 19.61 19.1   ~ 81 1
25 2MASS J06244505-3230554 BLL 06 24 45.0511094472 -32 30 55.383737868     19.70 19.7   ~ 16 0
26 ESO 161-7 IG 06 26 21.5 -53 41 09   14.48 15.4 15.16   ~ 71 2
27 7C 065109.30+425147.00 BLL 06 54 43.5253496568 +42 47 58.730753904     17.00 14.9   ~ 42 1
28 ICRF J065510.0+410010 QSO 06 55 10.0242416016 +41 00 10.168189344   14.6   9.37   ~ 61 1
29 4C 42.22 BLL 06 56 10.6619011872 +42 37 02.759080584   15.0 16.90 11.1   ~ 64 1
30 6C 070609+591309 BLL 07 10 30.0683697888 +59 08 20.371772544   17.38 16.52 15.1   ~ 203 2
31 7C 073311.80+594748.00 Bla 07 37 30.0868872000 +59 41 03.183360216   15.5   11.8   ~ 59 1
32 QSO B0737+744 BLL 07 44 05.3750968872 +74 33 58.256429832     16.89 16.6   ~ 125 0
33 LEDA 3095785 Sy1 08 06 38.9574958032 +72 48 20.403834696   15.9       ~ 26 1
34 7C 080602.89+522749.00 BLL 08 09 49.1868285744 +52 18 58.249938744   16.11 15.59 14.6   ~ 251 2
35 2MASX J08160416-0736000 BLL 08 16 04.1918724816 -07 35 59.734261968     16.10     ~ 20 0
36 6C 081649+490320 Bla 08 20 28.1081173104 +48 53 47.399580276       13.6   ~ 22 1
37 6C 082850+492334 BLL 08 32 23.2169864376 +49 13 21.037493424   20.17 19.63     ~ 157 1
38 NAME Hya A LIN 09 18 05.6783347248 -12 05 43.634531472   14.38 14.8     ~ 965 1
39 7C 092302.70+745857.00 BLL 09 28 02.9215998024 +74 47 19.291770312   19.8 19.74 19.2   ~ 49 1
40 QSO B0927+500 BLL 09 30 37.5737660328 +49 50 25.549611036   18.81 18.25 17.3   ~ 101 1
41 LEDA 3095942 BLL 10 22 12.6093907056 +51 24 00.300796992     18.09     ~ 48 0
42 2E 1050.7+4946 ClG 10 53 44.1 +49 29 56           ~ 57 1
43 7C 105047.29+494553.00 BLL 10 53 44.1256067376 +49 29 55.999047156   18.70 17.76 13.8   ~ 116 2
44 PMN J1057-7724 BLL 10 57 32.45952 -77 24 28.1016           ~ 16 2
45 7C 1055+5644 BLL 10 58 37.7276569824 +56 28 11.207405028   16.80 16.31 14.58   ~ 187 2
46 Mrk 421 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2540 1
47 6C 113337+702604 BLL 11 36 26.4090783600 +70 09 27.309071232   15.16 14.49 10.51   ~ 340 1
48 2MASX J11363009+6737042 BLL 11 36 30.0868711488 +67 37 04.345988232   18.19 17.45 15.3   ~ 123 1
49 7C 1144+3517 BLL 11 47 22.1297825184 +35 01 07.538786184   17.89 16.83 10.26   ~ 165 1
50 2MASX J11564661+4238073 BLL 11 56 46.5626369928 +42 38 07.522243404     17.70 15.6   ~ 27 0
51 QSO B1207+39 BLL 12 10 26.5907045256 +39 29 08.635546104   20.77 20.3 19.9   ~ 110 0
52 SDSS J121134.20+390053.5 BLL 12 11 34.20672 +39 00 53.5644     20.0 20.4   ~ 26 0
53 NGC 4278 LIN 12 20 06.8253868 +29 16 50.713486 11.54 11.09 10.16     ~ 917 2
54 QSO B1221+24 BLL 12 24 24.1862962656 +24 36 23.499792828   17.93 17.37     ~ 130 0
55 QSO B1229+6430 BLL 12 31 31.3949261640 +64 14 18.280701600   18.36 17.62 14.3   ~ 132 2
56 QSO B1235+632 BLL 12 37 39.0753390528 +62 58 42.801146328   18.89 18.25 17   ~ 103 0
57 NVSS J124310+731600 rG 12 43 11.2007100360 +73 15 59.214552012           ~ 26 1
58 GB6 B1251+5110 rG 12 53 26.1529915848 +50 54 28.244329848           ~ 13 1
59 QSO B1255+244 BLL 12 57 31.9330943592 +24 12 40.164677136     15.4 15.7   ~ 76 0
60 2MASX J13111781-0521201 BLL 13 11 17.8333730904 -05 21 19.956414348     18.70     ~ 12 0
61 2MASX J13240096+5739160 BLL 13 24 00.9062108592 +57 39 16.343433540     17.30 14.1   ~ 25 1
62 QSO B1407+59 BLL 14 09 23.4933928320 +59 39 40.624242444   19.60 19.05     ~ 80 0
63 7C 1415+2556 BLL 14 17 56.6706279264 +25 43 26.244368868   18.00 17.2 14.6   ~ 163 0
64 2MASX J14273023+5409238 BLL 14 27 30.2807057688 +54 09 23.720526720     17.40     ~ 36 1
65 QSO B1426+428 BLL 14 28 32.6090008440 +42 40 21.048123396   16.95 16.45 14.4   ~ 483 2
66 QSO B1440+122 BLL 14 42 48.2771008152 +12 00 40.348597716   18.34 17.63 15.2   ~ 153 2
67 2E 3328 BLL 14 44 34.9068259224 +63 36 05.984137260   20.76 19.67 18.6   ~ 62 0
68 WISH B1455.0-2113 AGN 14 57 54.6 -21 25 01           ~ 6 1
69 QSO B1458+22 BLL 15 01 01.8350446584 +22 38 06.373155444   16.29 15.79     ~ 120 0
70 4FGL J1516.8+2918 BLL 15 16 41.5940814168 +29 18 09.209994840     18.20 14.6   ~ 43 1
71 2MASX J15320226+3016290 BLL 15 32 02.2318415520 +30 16 28.855961652     15.60     ~ 68 1
72 QSO B1534+01 BLL 15 36 46.7546783544 +01 38 00.077346276     18.70     ~ 71 0
73 4C 14.60 BLL 15 40 49.4896705848 +14 47 45.909368088   17.72 17.30 17.240   ~ 393 1
74 QSO B1552+20 BLL 15 54 24.1304763192 +20 11 25.399984632     17.70     ~ 96 0
75 4C 39.49 BLL 16 53 52.2160772976 +39 45 36.613228860 14.09 14.15 13.29 8.26   ~ 2037 2
76 QSO B1741+196 BLL 17 43 57.8330083440 +19 35 09.018846384     16.80 12.7   ~ 145 1
77 2MASX J17453776+3951309 BLL 17 45 37.7544298992 +39 51 30.936584340     18.30 15.9   ~ 46 1
78 ICRF J174648.2+260320 BLL 17 46 48.2793534480 +26 03 20.362096440   17.0       ~ 20 1
79 2MASX J17500503+4700431 BLL 17 50 05.0110986456 +47 00 43.683226092     19.00     ~ 23 1
80 QSO B1757+703 BLL 17 57 13.0521071712 +70 33 37.820087172     18.27 18   ~ 73 0
81 3C 371 BLL 18 06 50.6802916920 +69 49 28.109609256   14.77 14.22 11.39   ~ 821 2
82 RX J1823.1+3324 X 18 23 09.8 +33 24 39           ~ 7 1
83 4C 56.27 BLL 18 24 07.0679485560 +56 51 01.479645612   18.9 18.4 16.48   ~ 456 1
84 2MASS J18412024+5906081 BLL 18 41 20.3046332760 +59 06 08.206599564     19.70 18.6   ~ 27 0
85 QSO B1853+671 BLL 18 53 52.0667262720 +67 13 55.016841792     16.4 17.1   ~ 40 1
86 QSO B2143+07 BLL 21 45 52.2999532008 +07 19 27.205685508     18.04 16   ~ 103 1
87 PMN J2241+0453 rG 22 41 34.2321409152 +04 53 10.405253868     15.28     ~ 21 1
88 2MASX J22500577+3824371 BLL 22 50 05.7481607616 +38 24 37.193100984     16.00 14.8   ~ 109 1
89 1WGA J2317.4-4213 X 23 17 55.8 -42 13 28           ~ 2 0
90 2MASS J23224401+3436139 BLL 23 22 44.0142017808 +34 36 13.873220208     15.88 13.2   ~ 64 1
91 PKS 2320+203 rG 23 23 20.3442252816 +20 35 23.535199932   15.5 15.5     ~ 33 1
92 QSO B2326+174 BLL 23 29 03.3191370096 +17 43 30.526001112     16.8 16.7   ~ 32 1
93 SDSS J235001.71+194151.4 BLL 23 50 01.71768 +19 41 51.4248     20.78 19.9   ~ 33 0

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2022.10.07-05:52:13

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