2005A&A...443...61O


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST18:08:47

2005A&A...443...61O - Astronomy and Astrophysics, volume 443, 61-78 (2005/11-3)

An optical imaging study of 0.4 ≤ z ≤ 0.8 quasar host galaxies. II. Analysis and interpretation.

OERNDAHL E. and ROENNBACK J.

Abstract (from CDS):

We performed optical imaging of 102 radio-loud and radio-quiet quasars at z=0.4-0.8, of which 91 fields were found suitable for host galaxy analysis after the deselection of saturated and otherwise flawed images. The data sets were obtained mainly in the R band, but also in the V and I or Gunn i band, and were presented in Roennback et al. (1996MNRAS.283..282R) and Oerndhal et al. (2003A&A...404..883O). In this paper we combine the two above-mentioned samples and also separately discuss additional hosts, extracted from data taken by Wold et al. (2000MNRAS.316..267W; 2001MNRAS.323..231W). The joint sample forms a sizeable fraction of the to-date total number of observed sources at intermediate redshifts and increases the number of resolved radio-quiet hosts at z>0.4 considerably. Equal numbers of radio-loud and radio-quiet objects were observed, resulting in a detection rate of 79% for the radio-loud hosts and 66% for the radio-quiet hosts. Profile fitting could only be carried out for a minority of the sample, but it results in predominantly elliptical morphologies. This is consistent with the mean values of the axial ratios, for which we find b/a> 0.8 for both radio-quiet and radio-loud hosts, just as in the case of normal elliptical galaxies. The mean absolute magnitudes of the radio-loud and radio-quiet hosts is MR=-23.5 in both cases. This similarity between the mean magnitudes of the two types of host galaxy is also seen in the other imaged bands. While the radio-loud host absolute R magnitudes are correlated with redshift, only a weak trend of the same sort is seen for the radio-quiet host magnitudes. Note, however, that the sample is not fully resolved and that the detection limit, in combination with the relationship between host and nuclear luminosity, may conspire in creating the illusion of an upturn in magnitude. The average nucleus-to-host galaxy luminosity ratios of the radio-loud and radio-quiet objects do not differ significantly in any band, nor is the difference between the average luminosity ratios of flat spectrum and steep spectrum radio-loud quasars larger than 1.5σ. Thus, no effect of beaming (as expected in the unifying scheme) is seen. The colours of both radio-loud and radio-quiet host galaxies are found to be as blue as present-day late-type spirals and starburst galaxies. These blue colours are most likely due neither to galaxy evolution over the range, which only gives rise to a colour shift of ∼0.2 mag, nor to scattered nuclear light, since colours determined from annular apertures yield very similar results. Since close companions in projection are not uncommon (and a few sources even exhibit tidal tail-like features and other signs of interaction), ongoing star formation is a reasonable explanation of the blue host colours. As multiple-band imaging primarily was carried out for quasars showing indications of the presence of a host galaxy, the colour analysis results are valid for host galaxies which are large, bright, have low nucleus-to-host luminosity ratios, and/or display large scale disturbances, but cannot however safely be generalised to hold for the quasar host galaxy population at intermediate redshift as a whole.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: quasars: general - galaxies: fundamental parameters - galaxies: photometry

CDS comments: In table 2 1640.5 is [CR82] 1640.5+397, 1641.7 is [CR82] 1641.7+396 and MG 2149 is MITG J2149+0756 in Simbad.

Simbad objects: 69

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Number of rows : 69

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 LBQS 0007+0236 QSO 00 10 19.546 +02 53 40.34     18.4     ~ 11 0
2 PB 5797 QSO 00 12 35.7244492036 +02 03 26.456904422   17.5 18.0     ~ 16 0
3 QSO B0015+162 QSO 00 18 32.008 +16 29 25.81   19 18.26 18.40   ~ 38 0
4 LBQS 0020-0300 QSO 00 22 55.1213565185 -02 44 18.729018859   18 17.3     ~ 15 0
5 LEDA 2822265 AGN 00 35 08.8 -20 04 01     20.1     ~ 34 1
6 LBQS 0058+0205 QSO 01 01 33.954 +02 21 53.92     18.5     ~ 11 0
7 QSO B0106-233 QSO 01 09 02.9918584936 -23 07 30.081450665   18.6 19.5     ~ 22 1
8 2MASS J01332463+2427415 Sy1 01 33 24.6277944267 +24 27 41.304424944     16.8     ~ 72 1
9 QSO B0135+056 QSO 01 37 48.812 +05 55 24.53   18.20 18.3     ~ 15 0
10 QSO B0136.3+0605 BLL 01 38 55.7190461996 +06 21 32.554126786     18.52     ~ 23 1
11 Mrk 1014 Sy1 01 59 50.2529351498 +00 23 40.874250335   16.08 15.87     ~ 518 0
12 QSO B0200-0858 QSO 02 03 26.2082139126 -08 43 48.526127955   16.86 16.68     ~ 25 0
13 QSO B0212+171 QSO 02 14 44.9128510 +17 22 49.511530   19.0 18.0     ~ 36 1
14 7C 021545.29+313535.00 QSO 02 18 42.2065133572 +31 49 26.854969178     19     ~ 13 1
15 4C -00.12 QSO 02 25 07.9325872256 -00 35 32.982676131   19.98 19.36     ~ 77 1
16 PB 6856 QSO 02 42 40.3187380197 +00 57 27.135228661   16.62 16.51     ~ 53 0
17 QSO B0256+0140 QSO 02 58 49.9206206764 +01 52 25.048507882   19.04 19.01     ~ 12 0
18 LBQS 0305+0222 QSO 03 08 14.1177167289 +02 34 23.158871428     17.9     ~ 12 0
19 2MASS J03445991-2451593 Sy1 03 44 59.9174666124 -24 51 59.144055972   18.72 18.8 17.62   ~ 14 0
20 2E 909 Sy1 03 55 59.0 +02 56 24   19.1 18.6     ~ 28 1
21 QSO B0403-132A BLL 04 05 34.0033474012 -13 08 13.691542963   17.37 17.09 16.6   ~ 316 1
22 QSO B0406-180 QSO 04 09 06.6759012689 -17 57 10.224717352     19.0     ~ 33 1
23 QSO B0415-200 QSO 04 17 18.3382779816 -19 54 51.532943688     19.5     ~ 10 0
24 ICRF J052109.8+163822 Sy1 05 21 09.88592749 +16 38 22.0517668   19.37 18.84 18.480   ~ 757 1
25 7C 074246.20+332052.00 QSO 07 45 59.3234725494 +33 13 34.134620837   18.98 18.88 18.09   ~ 58 1
26 QSO B0920-397 QSO 09 22 46.41826064 -39 59 35.0683561   18.12 18.8     ~ 100 1
27 ICRF J093241.1+530633 Sy1 09 32 41.1504952962 +53 06 33.807077419   19.38 19.18 18.82   ~ 64 1
28 4C 02.27 QSO 09 35 18.1943431119 +02 04 15.564759828   17.31 17.16     ~ 103 1
29 QSO B0946-197 QSO 09 49 05.82 -19 57 11.6   18.42 17.5 17.38   ~ 23 1
30 QSO B0958-042 QSO 10 00 32.4106823417 -04 27 44.572847047     18.40     ~ 12 0
31 ICRF J100646.4-215920 Sy1 10 06 46.4135955251 -21 59 20.401297263   17.05 16.89 16.29   ~ 69 1
32 7C 1019+4556 QSO 10 22 45.12 +45 41 05.5           ~ 2 0
33 [VV2006] J102324.0-010028 QSO 10 23 24.0894444531 -01 00 28.136879244     19.45     ~ 6 0
34 LBQS 1025+0218 Sy1 10 27 45.4005710410 +02 03 28.086340539   18.67 18.42     ~ 27 0
35 PB 329 QSO 10 31 44.5363024721 +41 54 20.912474361   18.96 18.75     ~ 24 2
36 ICRF J104806.6-190935 Sy1 10 48 06.62060701 -19 09 35.7266240   18.59 18.5 17.10   ~ 161 1
37 QSO B1116-462 QSO 11 18 26.9571887658 -46 34 15.003704198   17.54 17.00     ~ 111 1
38 QSO B1156-221 QSO 11 59 11.2675871857 -22 28 36.897914877   18.6 19.5 19.4   ~ 50 1
39 QSO B1157+118 QSO 11 59 46.444 +11 33 48.50   19.52 19.36     ~ 20 1
40 ICRF J120533.2-263404 Sy1 12 05 33.2122861 -26 34 04.463765   19.81 19.5 19.3   ~ 129 1
41 3C 275.1 QSO 12 43 57.6490661384 +16 22 53.396063536   19.23 19.00     ~ 285 1
42 AB 122 QSO 13 05 43.8146524694 +33 35 31.612850269   18.08 18.07     ~ 36 0
43 2MASX J13341346+3715340 Sy1 13 34 13.4943830524 +37 15 34.437258916   17.91 17.81     ~ 27 0
44 QSO B1423+146 QSO 14 25 49.0180000 +14 24 56.901838   18.35 17.96 19.54   ~ 45 1
45 LBQS 1435+0130 QSO 14 37 57.4393660927 +01 17 54.512185344   17.8 18.46 18.0   ~ 29 0
46 4C 09.52 QSO 14 53 53.9052274633 +09 34 23.211420323   18.28 18.15     ~ 40 1
47 7C 151247.00+370154.00 Sy1 15 14 43.0682940988 +36 50 50.355363752   17.11 17.01 15.83   ~ 379 1
48 [VV96] J151747.4+023306 QSO 15 17 47.4371073665 +02 33 06.757318066   19.9       ~ 12 0
49 4C 13.55 QSO 15 33 15.0706159775 +13 32 25.117980444   19.07 18.74     ~ 46 1
50 PG 1538+47 Sy1 15 39 34.8103282209 +47 35 31.265171935   16.01 15.81     ~ 87 1
51 QSO B1544+4855 Sy1 15 45 30.2362003284 +48 46 08.978296070   16.92 16.73     ~ 216 0
52 ICRF J155043.5+112047 Sy1 15 50 43.5946354507 +11 20 47.452265270   17.47 17.23 16.5   ~ 161 3
53 QSO B1608+114 QSO 16 10 33.4300318250 +11 15 30.655759646   18.5 19.5     ~ 24 1
54 QSO B1640+396 QSO 16 41 47.5394411699 +39 35 03.328547314   20.01 19.83     ~ 59 1
55 QSO B1641+399B QSO 16 43 34.8470708902 +39 53 46.444172621   19.56 19.50     ~ 39 0
56 4C 40.37 QSO 18 20 49.0869476110 +40 51 38.892479371     18.0     ~ 20 1
57 4C 22.47 QSO 18 21 13.5692790519 +22 51 14.574268124     18.0     ~ 24 1
58 4C 56.27 BLL 18 24 07.06837771 +56 51 01.4908371   18.9 18.4 16.48   ~ 441 1
59 ICRF J182931.7+484446 Sy1 18 29 31.7812801678 +48 44 46.158815781   17.05 16.81 16.860   ~ 636 1
60 QSO B2113+0536 QSO 21 16 08.9495456505 +05 48 38.895675126   19.6 18.9     ~ 10 0
61 QSO B2141+040 QSO 21 44 22.902 +04 16 26.28   17.1 17.50     ~ 12 0
62 QSO B2142+110 BLL 21 45 18.7750720 +11 15 27.312417   18.35 18.20 16.29   ~ 75 1
63 QSO B2201-1857 QSO 22 03 54.1137761405 -18 42 35.180798366   19.9       ~ 8 0
64 4C 08.64 QSO 22 12 01.5893045 +08 19 16.510473     18.5     ~ 109 1
65 4C 08.66 QSO 22 20 08.6757490657 +08 59 01.628806794   18 18.6     ~ 23 1
66 LBQS 2235+0054 QSO 22 37 34.152 +01 10 34.78   21.36 20.97     ~ 26 0
67 LBQS 2238+0133 QSO 22 40 52.6609516125 +01 49 26.132925342     18.1     ~ 11 0
68 4C 13.84 QSO 22 49 44.9473696 +13 31 09.476606   17.7 19.25 18.0   ~ 44 1
69 LBQS 2351-0036 QSO 23 54 09.1765986021 -00 19 47.951893289   18.80 18.48 18.1   ~ 98 1

    Equat.    Gal    SGal    Ecl

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2020.10.24-18:08:47

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