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: 94

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Number of rows : 94
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 ClG 0011.7+0837 ClG 00 14 21.1 +08 54 11     17.5     ~ 25 0
2 2dFGRS TGS283Z129 BLL 00 32 33.0970812456 -28 49 20.390589480   18.723 18.80 17.242   ~ 52 1
3 NGC 315 LIN 00 57 48.88334410 +30 21 08.8119345 12.80 12.20 11.16 11.26   ~ 869 2
4 RX J0110.0+4149 BLL 01 10 04.8120900624 +41 49 50.731434480       14   ~ 35 1
5 Z 502-27 rG 01 19 35.00087601 +32 10 50.0619670   16 14.5     ~ 249 1
6 QSO B0118-272 BLL 01 20 31.6628068344 -27 01 24.636341064   15.89 15.56 15.49   ~ 288 1
7 RX J0123.1+3420 BLL 01 23 08.6375580816 +34 20 48.664188060       16.8   ~ 132 1
8 QSO B0122+09 BLL 01 24 44.5398641328 +09 18 49.289559588     19.98 18.5   ~ 58 0
9 1RXS J014126.8-092857 BLL 01 41 25.83216015 -09 28 43.6742470   16.94 16.55 17.21   ~ 302 1
10 PMN J0152+0146 BLL 01 52 39.6109440384 +01 47 17.385104112       11.8   ~ 155 1
11 8C 0149+710 BLL 01 53 25.85101910 +71 15 06.4633311     15.50     ~ 105 1
12 RX J0201.1+0034 BLL 02 01 06.1794930072 +00 34 00.135789564   18.99 18.42 18   ~ 113 0
13 RX J0214.2+5144 BLL 02 14 17.9358553848 +51 44 51.945795816       16.5   ~ 133 1
14 6C 021803+354230 BLL 02 21 05.4920852208 +35 56 13.848581904   20.0 20.0 19.60   ~ 603 3
15 RX J0232.8+2017 BLL 02 32 48.6148874688 +20 17 17.486717388     18.00 13.96   ~ 387 1
16 1RXS J030103.8+344109 BLL 03 01 03.7549027896 +34 41 01.078942128     18.53     ~ 63 0
17 LEDA 138609 BLL 03 14 02.7340832016 +24 44 32.804176128     18.3     ~ 29 0
18 RX J0319.8+1845 BLL 03 19 51.8082475320 +18 45 34.562475432           ~ 223 1
19 PMN J0340-1813 rG 03 40 47.98 -18 14 00.6     19.6     ~ 8 1
20 1RXS J042218.2+195047 BLL 04 22 18.3397702069 +19 50 54.920278805           ~ 90 0
21 2MASX J04285086-3805503 BLL 04 28 50.8440888600 -38 05 50.439578784     18.90 15.6   ~ 13 0
22 RX J0507.9+6737 BLL 05 07 56.1631660632 +67 37 24.225299292       17.2   ~ 196 1
23 2MASS J05283471-5820180 BLL 05 28 34.6838447592 -58 20 18.332413512     19.20 16.3   ~ 14 1
24 QSO B0607+710 BLL 06 13 43.3821991056 +71 07 26.779488276   19.6 19.61 19.1   ~ 82 0
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 21.49 -53 41 09.2   14.48 15.4 15.16   ~ 77 2
27 7C 065109.30+425147.00 BLL 06 54 43.5253496568 +42 47 58.730753904     17.00 14.9   ~ 48 1
28 Z 204-27 QSO 06 55 10.02472583 +41 00 10.1602339   14.6   9.37   ~ 71 1
29 4C 42.22 BLL 06 56 10.66207584 +42 37 02.7512524   15.0 16.90 11.1   ~ 90 1
30 RX J0710.5+5908 BLL 07 10 30.0683697888 +59 08 20.371772544   17.38 16.52 15.1   ~ 249 1
31 Z 286-39 Bla 07 37 30.08694371 +59 41 03.1947899   15.5   11.8   ~ 67 1
32 QSO B0737+744 BLL 07 44 05.3750968872 +74 33 58.256429832     16.89 16.6   ~ 144 0
33 LEDA 3095785 Sy1 08 06 38.9574958032 +72 48 20.403834696   15.9       ~ 28 1
34 RX J0809.8+5218 BLL 08 09 49.1868285744 +52 18 58.249938744   16.11 15.59 14.6   ~ 302 1
35 2MASX J08160416-0736000 BLL 08 16 04.1918724816 -07 35 59.734261968     16.10     ~ 23 0
36 6C 081649+490320 Bla 08 20 28.1081173104 +48 53 47.399580276       13.6   ~ 29 1
37 6C 082850+492334 BLL 08 32 23.21674252 +49 13 21.0382979   20.17 19.63     ~ 173 1
38 MCG-02-24-007 LIN 09 18 05.66848602 -12 05 43.8060823   14.38 14.8     ~ 1077 1
39 7C 092302.70+745857.00 BLL 09 28 02.9215998024 +74 47 19.291770312   19.8 19.74 19.2   ~ 50 1
40 RX J0930.6+4950 BLL 09 30 37.5737660328 +49 50 25.549611036   18.81 18.25 17.3   ~ 128 0
41 RX J1022.2+5124 BLL 10 22 12.6093907056 +51 24 00.300796992           ~ 59 0
42 2E 1050.7+4946 ClG 10 53 44.1 +49 29 56           ~ 58 1
43 7C 105047.29+494553.00 BLL 10 53 44.1256067376 +49 29 55.999047156   18.70 17.76 13.8   ~ 155 2
44 PMN J1057-7724 BLL 10 57 32.45952 -77 24 28.1016           ~ 17 2
45 RX J1058.6+5628 BLL 10 58 37.7276569824 +56 28 11.207405028   16.80 16.31 14.58   ~ 232 1
46 Z 184-50 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2841 1
47 Z 334-43 BLL 11 36 26.4090783600 +70 09 27.309071232   15.16 14.49 10.51   ~ 394 1
48 HS 1133+6753 BLL 11 36 30.0868711488 +67 37 04.345988232   18.19 17.45 15.3   ~ 161 1
49 Z 186-48 BLL 11 47 22.1297825184 +35 01 07.538786184   17.89 16.83 10.26   ~ 184 1
50 2MASX J11564661+4238073 BLL 11 56 46.5626369928 +42 38 07.522243404     17.70 15.6   ~ 29 0
51 RX J1210.3+3929 BLL 12 10 26.5907045256 +39 29 08.635546104   20.77 20.3 19.9   ~ 116 0
52 RX J1211.5+3901 BLL 12 11 34.20932 +39 00 53.5362     20.0 20.4   ~ 38 0
53 NGC 4278 LIN 12 20 06.8242 +29 16 50.722 11.54 11.09 10.16     ~ 988 2
54 RX J1224.4+2436 BLL 12 24 24.1862962656 +24 36 23.499792828   17.93 17.37     ~ 162 1
55 QSO B1229+6430 BLL 12 31 31.3949261640 +64 14 18.280701600   18.36 17.62 14.3   ~ 160 2
56 RX J1237.6+6258 BLL 12 37 39.0753390528 +62 58 42.801146328   18.89 18.25 17   ~ 116 0
57 NVSS J124310+731600 rG 12 43 11.21710248 +73 15 59.2498613           ~ 35 1
58 NVSS J125326+505426 rG 12 53 26.1529915848 +50 54 28.244329848           ~ 18 1
59 RX J1257.5+2412 BLL 12 57 31.9330943592 +24 12 40.164677136       15.7   ~ 91 0
60 2MASX J13111781-0521201 BLL 13 11 17.8333730904 -05 21 19.956414348     18.70     ~ 13 1
61 ICRF J132400.9+573916 BLL 13 24 00.9062108592 +57 39 16.343433540     17.30 14.1   ~ 35 1
62 RX J1409.3+5939 BLL 14 09 23.4933928320 +59 39 40.624242444   19.60 19.05     ~ 83 1
63 RX J1417.9+2543 BLL 14 17 56.6706279264 +25 43 26.244368868   18.00 17.2 14.6   ~ 190 1
64 LEDA 3486854 BLL 14 27 30.2807057688 +54 09 23.720526720     17.40     ~ 41 1
65 RX J1428.5+4240 BLL 14 28 32.6090008440 +42 40 21.048123396   16.95 16.45 14.4   ~ 549 1
66 RX J1442.8+1200 BLL 14 42 48.2771008152 +12 00 40.348597716   18.34 17.63 15.2   ~ 189 1
67 RX J1444.5+6336 BLL 14 44 34.9068259224 +63 36 05.984137260   20.76 19.67 18.6   ~ 63 0
68 PMN J1457-2125 rG 14 57 54.6 -21 25 01           ~ 7 1
69 RX J1501.0+2238 BLL 15 01 01.8350446584 +22 38 06.373155444   16.29 15.79     ~ 139 1
70 RX J1516.7+2918 BLL 15 16 41.5940814168 +29 18 09.209994840       14.6   ~ 61 1
71 RX J1532.0+3016 BLL 15 32 02.2318415520 +30 16 28.855961652           ~ 97 1
72 RX J1536.7+0137 BLL 15 36 46.7546783544 +01 38 00.077346276           ~ 72 1
73 4C 14.60 BLL 15 40 49.49151924 +14 47 45.8846989   17.72 17.30 17.240   ~ 448 1
74 RX J1554.4+2011 BLL 15 54 24.1304763192 +20 11 25.399984632     17.70     ~ 112 1
75 Z 225-7 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2304 2
76 1RXS J174357.3+193505 BLL 17 43 57.8330083440 +19 35 09.018846384     16.80 12.7   ~ 190 1
77 7C 174359.60+395236.00 BLL 17 45 37.7544298992 +39 51 30.936584340     18.30 15.9   ~ 65 2
78 ICRF J174648.2+260320 BLL 17 46 48.2793534480 +26 03 20.362096440   17.0       ~ 26 1
79 7C 174843.00+470200.00 BLL 17 50 05.0110986456 +47 00 43.683226092     19.00     ~ 24 1
80 RX J1757.2+7033 BLL 17 57 13.0521071712 +70 33 37.820087172       18   ~ 87 1
81 Z 340-35 BLL 18 06 50.6802916920 +69 49 28.109609256   14.77 14.22 11.39   ~ 909 1
82 NVSS J182309+332436 Rad 18 23 09.84 +33 24 39.2           ~ 9 1
83 MCS J1823.1+3324 ClG 18 23 10.415 +33 24 30.18           ~ 8 0
84 4C 56.27 BLL 18 24 07.06837171 +56 51 01.4908155   18.9 19.30 16.48   ~ 510 1
85 1RXS J184121.3+590603 BLL 18 41 20.3046332760 +59 06 08.206599564       18.6   ~ 27 0
86 1RXS J185351.0+671356 BLL 18 53 52.0667262720 +67 13 55.016841792       17.1   ~ 52 1
87 PMN J2145+0720 BLL 21 45 52.2999532008 +07 19 27.205685508       16   ~ 120 1
88 PMN J2241+0453 rG 22 41 34.2321409152 +04 53 10.405253868     15.28     ~ 23 1
89 RX J2250.0+3824 BLL 22 50 05.7481607616 +38 24 37.193100984       14.8   ~ 147 2
90 1WGA J2317.4-4213 C?G 23 18 04.6 -42 13 42           ~ 3 0
91 1RXS J232243.7+343616 BLL 23 22 44.0142017808 +34 36 13.873220208       13.2   ~ 87 1
92 Z 454-57 rG 23 23 20.3442252816 +20 35 23.535199932   15.5 15.5     ~ 47 1
93 QSO B2326+174 BLL 23 29 03.3191370096 +17 43 30.526001112     16.8 16.7   ~ 33 2
94 NVSS J235001+194151 BLL 23 50 01.71932 +19 41 51.5338     20.78 19.9   ~ 33 0

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