2002ApJ...566..181C

Query : 2002ApJ...566..181C

2002ApJ...566..181C - Astrophys. J., 566, 181-186 (2002/February-2)

On the cosmological evolution of BL Lacertae objects.

CACCIANIGA A., MACCACARO T., WOLTER A., DELLA CECA R. and GIOIA I.M.

Abstract (from CDS):

We study the cosmological evolution of BL Lac objects by applying the Ve/Va analysis to a new sample of 55 objects, presented for the first time in this paper. This sample has been selected from the 239 sources with the brightest X-ray flux (≥4x10–13 ergs.s–1.cm–2) and relatively bright optical counterparts (B≤20.5) among the ∼1600 objects included in the REX survey. The uniform distribution of the Ve/Va values found in the sample suggests that BL Lac objects are not affected by a strong cosmological evolution, in contrast with the behavior observed in the emission-line active galactic nuclei. The Ve/Va analysis applied to the subsample of the high-energy-peaked BL Lac objects (HBLs) does not reveal a significant departure from a uniform distribution. This result suggests either that the cosmological evolution is less extreme than that previously found in other samples or that it is carried out only by a minority of objects, namely, by the most extreme HBLs not selected in our sample.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: BL Lacertae Objects: General - Galaxies: Active - Galaxies: Quasars: General - Surveys

Simbad objects: 55

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Number of rows : 55
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 9C J0027+2607 BLL 00 27 26.9974 +26 07 07.142     19.00 17.4   ~ 18 1
2 2MASS J01243061+3249464 BLL 01 24 30.5580562968 +32 49 46.278506712     19.90 19   ~ 11 0
3 1RXS J012657.1+330730 BLL 01 26 57.2379078072 +33 07 30.315326268     17.70 18.7   ~ 30 0
4 2MASS J01530732+7517429 BLL 01 53 07.3819815144 +75 17 42.924650784     18.90 18.3   ~ 33 0
5 RX J0201.1+0034 BLL 02 01 06.1794930072 +00 34 00.135789564   18.99 18.42 18   ~ 113 0
6 1RXS J021905.8-172503 BLL 02 19 05.5032704376 -17 25 13.089358128   18.44   16.88   ~ 48 1
7 3C 66A BLL 02 22 39.6114771888 +43 02 07.799534304   15.71 15.21 14.5   ~ 942 2
8 2MASS J03100630+4056547 BLL 03 10 06.307 +40 56 54.74     18.40 16.4   ~ 8 0
9 1RXS J033311.8-361942 BLL 03 33 12.2677895088 -36 19 46.662911112   19.94   17.99   ~ 59 0
10 1RXS J033810.1-244337 BLL 03 38 12.5471299248 -24 43 50.093102640       18.6   ~ 46 0
11 1WGA J0353.0-3623 BLL 03 53 05.0447374488 -36 23 08.409059556       18.2   ~ 36 0
12 1RXS J050640.2-085741 BLL 05 06 39.9088369032 -08 58 01.798994244     18.90 18   ~ 41 0
13 1RXS J053629.4-334302 BLL 05 36 29.0674147920 -33 43 02.465333796 17.11 16.97 16.93 16.8   ~ 58 1
14 2MASS J05465676-2204572 BLL 05 46 56.7786965808 -22 04 57.415510632     20.30 17.7   ~ 16 0
15 PMN J0558-3839 BLL 05 58 06.4316057352 -38 38 31.590709152   17.50 17.1     ~ 93 1
16 2MASS J06244505-3230554 BLL 06 24 45.0511094472 -32 30 55.383737868     19.70 19.7   ~ 16 0
17 RX J0733.4+3515 BLL 07 33 29.5804182336 +35 15 42.720710040     17.90 16.4   ~ 26 1
18 QSO B0737+744 BLL 07 44 05.3750968872 +74 33 58.256429832     16.89 16.6   ~ 144 0
19 RX J0747.3+0906 BLL 07 47 22.1921230560 +09 05 48.497326620   19.20 18.68 17   ~ 38 0
20 RX J0801.0+6444 BLL 08 01 02.2609263720 +64 44 49.695222480       18.9   ~ 24 0
21 RX J0805.4+7534 BLL 08 05 26.6463654144 +75 34 25.040530200       15.2   ~ 69 1
22 2MASXI J0810546+491103 BLL 08 10 54.5967522168 +49 11 03.822378000     17.00 13.5   ~ 25 0
23 1REX J081421+0857.0 BLL 08 14 21.671 +08 57 06.33     19.90 17.3   ~ 11 1
24 RX J0819.2-0756 BLL 08 19 17.5832101176 -07 56 26.141444304       18.4   ~ 43 0
25 1WGA J0827.1+0841 BLL 08 27 07.0761990048 +08 41 21.409476720     20.40 19.5   ~ 10 1
26 Ton 397 BLL 09 15 52.4015550384 +29 33 24.042671532   16.79 16.39 16.085   ~ 238 1
27 7C 0927+3516 BLL 09 30 55.27911112 +35 03 37.6081515   20.98 20.35 18.40   ~ 77 1
28 RX J0940.3+6148 BLL 09 40 22.4527825176 +61 48 26.262994536   19.67 18.69 16.9   ~ 71 0
29 RX J1016.2+4108 BLL 10 16 16.8174659184 +41 08 12.561968004           ~ 21 0
30 2MASS J10333589-1436275 BLL 10 33 35.8388631528 -14 36 27.503745156     20.20 18.6   ~ 9 1
31 5C 2.189 BLL 11 11 58.8998098632 +48 57 01.415468232   20.04 19.64     ~ 19 1
32 RX J1204.2+1145 BLL 12 04 12.1161519696 +11 45 55.333894824   18.63 18.05 16.6   ~ 63 0
33 RX J1210.3+3929 BLL 12 10 26.5907045256 +39 29 08.635546104   20.77 20.3 19.9   ~ 116 0
34 PMN J1215+0732 BLL 12 15 10.9765816512 +07 32 04.676330688     16.0 14.8   ~ 114 1
35 Ton 605 HB* 12 16 53.6748432768 +30 04 08.692883544   16.110 15.98     B 223 0
36 RX J1217.8+3007 BLL 12 17 52.0819904040 +30 07 00.634936872   16.07 15.62 13.47   G7 516 1
37 PG 1218+304 BLL 12 21 21.9426947832 +30 10 37.158534012   16.50 15.85 15.7   ~ 497 1
38 NVSS J123123+142123 BLL 12 31 23.9056875672 +14 21 24.429803472     17.70 16.9   ~ 75 0
39 RX J1241.6+3440 BLL 12 41 41.3827131720 +34 40 31.005349824   20.21 19.70 19.4   DC 35 0
40 RX J1242.5+7634 BLL 12 42 32.3101382856 +76 34 17.742560916     18.90 19.3   ~ 14 0
41 1RXS J125135.2-295824 BLL 12 51 34.8343469232 -29 58 43.146193476       18.5   ~ 32 0
42 1RXS J125400.1+624303 BLL 12 53 59.3101739256 +62 42 57.608215020   19.72 19.01 17   ~ 53 0
43 RX J1311.9+0853 BLL 13 11 55.7643949872 +08 53 41.074794564   20.41 19.69 18.9   ~ 19 0
44 2MASS J13253180+6621029 BLL 13 25 31.8021149016 +66 21 03.277142676     19.40 17.5   ~ 12 0
45 1RXS J133530.6-295031 BLL 13 35 29.7518919576 -29 50 38.921848188   18.13   19.25   ~ 70 0
46 7C 1338+4015 BLL 13 41 05.1067840920 +39 59 45.418368768   18.93 18.24 14.9   ~ 91 2
47 RX J1409.3+5939 BLL 14 09 23.4933928320 +59 39 40.624242444   19.60 19.05     ~ 83 1
48 RX J1410.4+2821 BLL 14 10 29.5571107272 +28 20 55.651710012   17.97 17.52 18.5   ~ 55 0
49 RX J1417.9+2543 BLL 14 17 56.6706279264 +25 43 26.244368868   18.00 17.2 14.6   ~ 190 1
50 1WGA J1426.7+2415 BLL 14 26 45.5255143200 +24 15 23.087863188   19.51 19.19 20   ~ 15 0
51 NVSS J143546+581521 BLL 14 35 45.9060093696 +58 15 24.982218684     19.70 17.8   ~ 9 1
52 RX J1631.4+4216 BLL 16 31 24.7071049968 +42 17 02.366014416   19.82 19.29 18.4   ~ 29 0
53 RX J2233.0+1335 BLL 22 33 01.1160978528 +13 36 01.994608836   19.66 18.88 17.6   ~ 41 1
54 2FGL J2341.7+8016 BLL 23 40 54.2290641384 +80 15 16.020826848     18.90 16.8   ~ 59 1
55 1RXS J234538.0-144924 BLL 23 45 38.4249663576 -14 49 28.778832588     19.2 17   ~ 27 0

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