2003A&A...412L..29K


Query : 2003A&A...412L..29K

2003A&A...412L..29K - Astronomy and Astrophysics, volume 412, L29-32 (2003/12-3)

HI absorption in a gravitational lens at z ∼ 0.7645.

KANEKAR N. and BRIGGS F.H.

Abstract (from CDS):

We have used the Westerbork Synthesis Radio Telescope to detect HI 21 cm absorption at z∼0.7645 in the gravitational lens system towards PMN J0134-0931. The 21cm profile has two broad components, with peak optical depths of 0.047±0.007 and 0.039±0.007, at heliocentric redshifts 0.76470±0.00006 and 0.76348±0.00006, respectively. The redshift of the stronger component matches that of CaII H and K absorption detected earlier. The absorption has a total velocity width of ∼500km/s (between nulls) and an equivalent width of 7.1±0.08km/s. This would imply a total HI column density of 2.6±0.3x1021/cm2, for a spin temperature of 200K and a covering factor of unity. The high estimated HI column density is consistent with the presence of large amounts of dust at the lens redshift; the intervening dust could be responsible for the extremely red colour of the background quasar.

Abstract Copyright:

Journal keyword(s): galaxies: individual: PMN J0134-0931 - gravitational lensing - radio lines - ISM

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 [WLC2002] J0134-0931 D LeQ 01 34 35.6657627616 -09 31 02.903742300           ~ 6 0
2 [WLC2002] J0134-0931 E LeQ 01 34 35.6657627616 -09 31 02.903742300           ~ 6 0
3 QSO B0132-097 QSO 01 34 35.6657627616 -09 31 02.903742300   24.52 22.70 20.80   ~ 110 1
4 [WLC2002] J0134-0931 A LeQ 01 34 35.6657627616 -09 31 02.903742300           ~ 6 0
5 [WLC2002] J0134-0931 B LeQ 01 34 35.6657627616 -09 31 02.903742300           ~ 6 0
6 [WLC2002] J0134-0931 C LeQ 01 34 35.6657627616 -09 31 02.903742300           ~ 6 0
7 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2820 2
8 6C 021803+354230 BLL 02 21 05.4920852208 +35 56 13.848581904   20.0 20.0 19.60   ~ 561 3
9 ICRF J052109.8+163822 Sy1 05 21 09.88596258 +16 38 22.0515459   19.37 18.84 18.480   ~ 856 1
10 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1499 1
11 QSO B1359+154 QSO 14 01 35.588 +15 13 24.15     21.90     ~ 73 1
12 QSO B1830-211 Bla 18 33 39.9399138048 -21 03 39.368838780     18.70 21   ~ 676 1
13 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2856 2

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