2002A&A...381..810P

Query : 2002A&A...381..810P

2002A&A...381..810P - Astronomy and Astrophysics, volume 381810-824 (2002/1-3)

Deep optical imaging of radio selected BL Lacertae objects.

PURSIMO T., NILSSON K., TAKALO L.O., SILLANPAEAE A., HEIDT J. and PIETILAE H.

Abstract (from CDS):

Deep imaging data on radio-selected BL Lacertae objects are presented. The complete 1Jy sample consists of 37 objects. Altogether 25 objects were observed which span a large range of redshifts (up to z=1.34) with 12 objects having z>0.5. In addition, three objects are located at an unknown distance. Altogether in eleven objects the host galaxy could be resolved. All nine objects with z≲0.4 were resolved and all eleven objects with z>0.7 or unknown redshift were unresolved. In all (six) low-z (z≲0.2) objects, an elliptical host galaxy was preferred. Of the remaining objects, only in one case (2007+777) did a disc-type galaxy give better fit than elliptical, but in this case neither can be preferred. The absolute brightness of the host galaxies (median MR=-23.82) is similar to the findings of X-ray selected BL Lacs and low redshift radio galaxies. Also the sizes (median re=14.8kpc) of the galaxies are similar. This supports the idea that (at least low redshift) BL Lacs belong to one family of objects. These results agree well with other recent studies on BL Lacs. There is a strong correlation between the brightness of the active nucleus and redshift. At low redshift radio and X-ray selected BL Lacs have similar brightnesses. No (or only weak) correlation was found between the brightness of the nucleus and the host galaxy.

Abstract Copyright: ∼

Journal keyword(s): BL Lacertae objects: general - galaxies: nuclei - galaxies: structure

CDS comments: QSO B0138-097 is a misprint for QSO B0138-098, 4C56.37 is a misprint fo r4C56.27 (in table 1).

Simbad objects: 38

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Number of rows : 38
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 QSO B0048-09 BLL 00 50 41.3172421464 -09 29 05.210474100 16.74 16.39 16.22 16.14   ~ 480 2
2 1RXS J014126.8-092857 BLL 01 41 25.83216015 -09 28 43.6742470   16.94 16.55 17.21   ~ 302 1
3 1RXS J020837.5+352314 BLL 02 08 38.1634090056 +35 23 12.806970864       18.8   ~ 110 0
4 6C 021803+354230 BLL 02 21 05.4920852208 +35 56 13.848581904   20.0 20.0 19.60   ~ 603 3
5 QSO B0235+1624 BLL 02 38 38.93010450 +16 36 59.2745528   16.46 15.50 15.92   ~ 1614 2
6 QSO B0454+844 BLL 05 08 42.36351222 +84 32 04.5441733     16.5 18.95   ~ 250 1
7 PKS J0550-3216 BLL 05 50 40.5705144672 -32 16 16.484718648   16.07 15.5     ~ 424 1
8 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 15.50 14.27   ~ 1388 1
9 QSO J0738+1742 BLL 07 38 07.39375312 +17 42 18.9981506   16.76 16.22 15.78   ~ 1045 1
10 7C 081451.89+423206.00 BLL 08 18 15.99961476 +42 22 45.4148987   18.88 18.18 17.81   ~ 429 1
11 4C 22.21 BLL 08 23 24.7592164368 +22 23 03.287299236   20.22 19.57 19.7   ~ 186 1
12 QSO B0823+033 BLL 08 25 50.33835759 +03 09 24.5199749   17.81 17.23 16.91   ~ 352 1
13 6C 082850+492334 BLL 08 32 23.21674252 +49 13 21.0382979   20.17 19.63     ~ 173 1
14 PG 0851+202 BLL 08 54 48.8749846272 +20 06 30.639583620   15.649 15.146 15.446   ~ 2513 1
15 6C 095456+654857 BLL 09 58 47.2451872176 +65 33 54.819354600     17.0 15.75   ~ 771 1
16 7C 1147+2434 BLL 11 50 19.21218244 +24 17 53.8352318   16.26 15.74 15.80   ~ 294 1
17 US 371 BLL 13 10 28.66385420 +32 20 43.7828340   15.61 15.24 17.91   ~ 917 1
18 QSO B1413+135 BLL 14 15 58.81751033 +13 20 23.7128587   21.055 20.000 18.461   ~ 476 1
19 6C 141804+543700 BLL 14 19 46.5974051952 +54 23 14.787857796   16.17 15.65 14.16   ~ 630 1
20 ESO 514-1 BLL 15 17 41.8134049824 -24 22 19.482207024   15.13 14.00 13.95   ~ 815 3
21 RX J1517.7+6525 BLL 15 17 47.5882526184 +65 25 23.285593704       16.7   ~ 131 1
22 4C 14.60 BLL 15 40 49.49151924 +14 47 45.8846989   17.72 17.30 17.240   ~ 448 1
23 Z 225-7 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2304 2
24 RX J1748.5+7005 BLL 17 48 32.8402992264 +70 05 50.768819304   17.46 17.01 15.48   ~ 456 2
25 4C 09.57 BLL 17 51 32.81857326 +09 39 00.7284066   17.46 16.78 15.57   ~ 1007 1
26 1RXS J180043.6+782806 BLL 18 00 45.6838528560 +78 28 04.018028016   16.4 15.90 16.134   ~ 793 1
27 Z 340-35 BLL 18 06 50.6802916920 +69 49 28.109609256   14.77 14.22 11.39   ~ 909 1
28 4C 56.27 BLL 18 24 07.06837171 +56 51 01.4908155   18.9 19.30 16.48   ~ 510 1
29 QSO B1959+650 BLL 19 59 59.8520303688 +65 08 54.652536492     12.8 11.21   ~ 699 2
30 8C 2007+777 BLL 20 05 30.9987913056 +77 52 43.248139536     16.5 17.36   ~ 474 1
31 QSO B2029+121 BLL 20 31 54.99426552 +12 19 41.3401260     18.5 17.42   ~ 189 1
32 4C -02.81 BLL 21 34 10.30958988 -01 53 17.2389056   18.6 19.00 18.87   ~ 431 1
33 QSO B2150+173 BLL 21 52 24.81939266 +17 34 37.7950210     17.9 17.98   ~ 186 2
34 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2397 1
35 QSO B2240-260 BLL 22 43 26.4084975168 -25 44 30.680406312   18.59   16.80   ~ 205 1
36 QSO B2254+0727 BLL 22 57 17.30311778 +07 43 12.3025633   17.07 16.36     ~ 317 1
37 [HNP96] PKS 0139-097 B G ~ ~           ~ 3 0
38 [HNP96] PKS 0139-097 C G ~ ~           ~ 4 0

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