2008A&A...485..403O

Query : 2008A&A...485..403O

2008A&A...485..403O - Astronomy and Astrophysics, volume 485403-415 (2008/7-2)

Extinction properties of lensing galaxies.

OESTMAN L., GOOBAR A. and MOERTSELL E.

Abstract (from CDS):

Observations of quasars shining through foreground galaxies, offer a way to probe the dust extinction curves of distant galaxies. Interesting objects for this study are found in strong gravitational lensing systems, where the foreground galaxies generate multiple images. The reddening law of lensing galaxies is investigated by studying the colours of gravitationally-lensed quasars, and a handful of other quasars where a foreground galaxy is detected. We compare the observed colours of quasars reported in the literature, with spectral templates reddened by different extinction laws and dust properties. The data consists of 21 quasar-galaxy systems, with a total of 48 images. The galaxies, which are both early- and late-type, have redshifts in the interval z=0.04-1.51. We measure a difference in rest-frame B-V between the quasar images we study, and quasars without resolved foreground galaxies. This difference in colour is indicative of significant dust extinction in the intervening galaxy. Good fits to standard extinction laws were found for 22 of the images, corresponding to 13 different galaxies. Our fits imply a wide range of possible values for the total-to-selective extinction ratio, RV. The distribution was found to be broad with a weighted mode of RV=2.4 and a FWHM of ΔRV=2.7 (σRV∼1.1). Thus the bulk of the galaxies for which good reddening fits could be derived, have dust properties compatible with the Milky Way value (RV=3.1).

Abstract Copyright: ∼

Journal keyword(s): ISM: dust, extinction - galaxies: ISM - galaxies: evolution - galaxies: quasars: general - techniques: photometric

Simbad objects: 67

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Number of rows : 67
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 QSO J0121+0027 QSO 01 21 47.7362077896 +00 27 18.717353316   20.33 19.85     ~ 44 0
3 QSO B0142-100 QSO 01 45 16.5958283760 -09 45 17.265131352   17.23 16.95     ~ 247 1
4 QSO B0142-100A LeQ 01 45 17.3 -09 45 12     16.9     ~ 41 1
5 QSO B0142-100B LeQ 01 45 17.3 -09 45 12     19.1     ~ 28 1
6 [WCL99] HE 0230-2130 B LeI 02 32 33.02 -21 17 27.8   20.06       ~ 9 0
7 [WCL99] HE 0230-2130 A2 LeI 02 32 33.05 -21 17 26.3   19.27       ~ 8 0
8 [WCL99] HE 0230-2130 A1 LeI 02 32 33.10 -21 17 26.0   19.27       ~ 8 0
9 [WCL99] HE 0230-2130 gLS 02 32 33.10 -21 17 26.0           ~ 9 0
10 [WCL99] HE 0230-2130 C LeI 02 32 33.12 -21 17 28.0   21.87       ~ 9 0
11 [VV2000] J023233.1-211726 QSO 02 32 33.17832 -21 17 25.6308     18.10     ~ 59 1
12 [HTL92] C LeI 04 14 37.64 +05 34 42.7           ~ 43 0
13 [HTL92] B LeI 04 14 37.73 +05 34 44.3     25.5     ~ 48 0
14 4C 05.19 QSO 04 14 37.76734974 +05 34 42.3295956   24.100 23.800 21.270   ~ 371 2
15 [HTL92] A1 LeI 04 14 37.77 +05 34 42.4           ~ 48 0
16 [HTL92] A2 LeI 04 14 37.78 +05 34 42.8           ~ 47 0
17 [WSB2002] 0435-1223 C LeQ 04 38 14.73 -12 17 15.0     19.149   19.631 ~ 39 0
18 [WSB2002] 0435-1223 B LeQ 04 38 14.80 -12 17 13.8     19.082   19.623 ~ 43 0
19 [WSB2002] 0435-1223 D LeQ 04 38 14.84 -12 17 16.0     19.196   19.824 ~ 42 0
20 [VV2006] J043814.8-122314 QSO 04 38 14.88 -12 17 14.6     17.15     ~ 245 2
21 [WSB2002] 0435-1223 A LeQ 04 38 14.90 -12 17 14.4     18.545   19.106 ~ 41 0
22 QSO J0849+5108 BLL 08 49 57.97685916 +51 08 29.0238146   19.37 18.78 17.79   ~ 270 2
23 [JRF2003] J0903+5028 B LeI 09 03 34.877 +50 28 18.75           ~ 3 0
24 [VV2006] J090334.9+502819 QSO 09 03 34.9475 +50 28 19.293   22.90 21.49     ~ 44 2
25 [JRF2003] J0903+5028 A LeI 09 03 35.132 +50 28 20.21           ~ 3 0
26 [IBB2003] SDSS J0924+0219 C LeI 09 24 55.7659 +02 19 24.691           ~ 17 0
27 [IBB2003] SDSS J0924+0219 gLS 09 24 55.80 +02 19 24.8           ~ 26 0
28 QSO J0924+0219 QSO 09 24 55.8048 +02 19 24.850   18.58 18.36     ~ 142 1
29 [IBB2003] SDSS J0924+0219 A LeI 09 24 55.8293 +02 19 25.356           ~ 24 0
30 [IBB2003] SDSS J0924+0219 B LeI 09 24 55.8327 +02 19 23.565           ~ 23 0
31 QSO B0952-0115A QSO 09 55 00 -01 30.1           ~ 6 0
32 QSO B0952-0115B QSO 09 55 00.1 -01 30 06           ~ 4 0
33 QSO B0952-0115 QSO 09 55 00.1037541106 -01 30 06.549307797     18.7     ~ 150 0
34 QSO J1004+1229 QSO 10 04 24.8871 +12 29 22.245   24.83 23.23 20.80   ~ 53 1
35 [LGB2002] J1004+1229 A LeQ 10 04 24.9 +12 29 22           ~ 2 0
36 [LGB2002] J1004+1229 B LeQ 10 04 24.9 +12 29 22           ~ 2 0
37 QSO J1004+4112C LeQ 10 04 33.8292372048 +41 12 34.730027748   19.81 19.68     ~ 47 0
38 QSO J1004+4112D LeQ 10 04 34.0633356432 +41 12 48.933745452   20.70 20.43     ~ 43 0
39 QSO J1004+4112A LeQ 10 04 34.8073329240 +41 12 39.238429320   18.74 18.62     ~ 67 0
40 QSO J1004+4112 LeQ 10 04 34.9243842216 +41 12 42.771018060   19.14 19.03     ~ 206 1
41 4C 05.51 rG 11 31 56.493 +04 55 48.85           ~ 123 1
42 [VV2006] J114719.9+522923 QSO 11 47 19.9109322648 +52 29 23.221227624   19.38 19.12     ~ 32 1
43 [PEI2004] QSO B LeI 11 55 17.085 +63 46 21.59           ~ 7 1
44 [PEI2004] SDSS J1155+6346 gLS 11 55 17.3 +63 46 22           ~ 13 0
45 [VV2006] J115517.3+634622 QSO 11 55 17.3177 +63 46 22.074   19.31 18.66     ~ 34 1
46 [PEI2004] QSO A LeI 11 55 17.35 +63 46 22.0           ~ 7 1
47 [VV2000] J115518.3+193942 QSO 11 55 18.2955044232 +19 39 42.228456840   17.15 16.89     ~ 100 2
48 [RNB2002] A LeI 11 55 18.2971 +19 39 42.230           ~ 10 0
49 [RNB2002] B LeI 11 55 18.3633 +19 39 40.982           ~ 10 0
50 QSO J1310+0108 QSO 13 10 58.1374359024 +01 08 22.209002880   19.31 18.75     ~ 32 2
51 QSO J1446+0351 QSO 14 46 12.9788157264 +03 51 54.455988528   21.04 20.62     ~ 25 0
52 QSO J1459+0024 QSO 14 59 07.1942637720 +00 24 01.272819600   19.43 18.87     ~ 46 0
53 QSO J1654+1346 QSO 16 54 41.7895558608 +13 46 21.369503604     20.93     ~ 82 1
54 [MCS2004b] WFI J2033-4723 A1 LeI 20 33 42.08 -47 23 43.4           ~ 15 1
55 [MCS2004b] WFI J2033-4723 C LeI 20 33 42.10 -47 23 45.0           ~ 28 1
56 [VV2006] J203342.1-472343 QSO 20 33 42.12 -47 23 43.9           ~ 135 1
57 [MCS2004b] WFI J2033-4723 A2 LeI 20 33 42.16 -47 23 43.3           ~ 15 1
58 [MCS2004b] WFI J2033-4723 B LeI 20 33 42.30 -47 23 44.6           ~ 28 1
59 [VV2006] J220132.9-320143 QSO 22 01 32.9 -32 01 43     21.93   19.94 ~ 14 1
60 QSO J2240+0321 QSO 22 40 30.234 +03 21 30.63           ~ 705 1
61 Z 378-15 AGN 22 40 30.23447 +03 21 30.6290           ~ 636 0
62 QSO B2237+0305D LeI 22 40 30.28 +03 21 29.3   18.98       ~ 78 0
63 QSO B2237+0305B LeI 22 40 30.30 +03 21 30.5   17.82       ~ 78 0
64 QSO B2237+0305A LeI 22 40 30.34 +03 21 28.8   17.96       ~ 90 0
65 QSO B2237+0305C LeI 22 40 30.38 +03 21 30.0   18.66       ~ 81 0
66 [CTM2006] QSO A LeI ~ ~           ~ 3 1
67 [CTM2006] QSO B LeI ~ ~           ~ 3 1

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