2002A&A...381L..73K


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.19CET16:55:24

2002A&A...381L..73K - Astronomy and Astrophysics, volume 381, L73-76 (2002/1-3)

Molecular gas at intermediate redshifts.

KANEKAR N. and CHENGALUR J.N.

Abstract (from CDS):

We present Giant Metrewave Radio Telescope (GMRT) observations of OH absorption in B3 1504+377 (z∼0.673) and PKS 1413+135 (z∼0.247). OH has now been detected in absorption towards four intermediate redshift systems, viz. the lensing galaxies towards B 0218+357 (z∼0.685; Kanekar et al., 2001, in prep.) and 1830-211 (z∼0.886; Chengalur et al., 1999A&A...343L..79C), in addition to the two systems listed above. All four systems also give rise to well studied millimetre wavelength molecular line absorption from a host of molecules, including HCO+. Comparing our OH data with these millimetre line transitions, we find that the linear correlation between NOH and NHCO+^_ found in molecular clouds in the Milky Way (Liszt & Lucas, 1996A&A...314..917L) persists out to z∼1. It has been suggested (Liszt & Lucas, 1999, ASP Conf. Ser., 156, 188) that OH is a good tracer of H2, with NH2/NOH≃107 under a variety of physical conditions. We use this relationship to estimate NH2 in these absorbers. The estimated NH2 is >1022 in all four cases and substantially different from estimates based on CO observations.

Abstract Copyright:

Journal keyword(s): galaxies: evolution: - galaxies: formation: - galaxies: ISM - cosmology: observations - radio lines: galaxies

Nomenclature: Table 1: [KC2002] QSO JHHMM+DDMM abs N.NNNNN N=4.

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2548 2
2 QSO B0218+357 QSO 02 21 05.5 +35 56 14   20.0 20.0 19.60   ~ 510 2
3 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3813 2
4 3C 295 Sy2 14 11 20.467 +52 12 09.52   22.34 20.80 18.54   ~ 906 5
5 QSO B1413+135 BLL 14 15 58.81750938 +13 20 23.7129069   21.055 20.000 18.461   ~ 385 1
6 ICRF J150609.5+373051 Sy2 15 06 09.52996778 +37 30 51.1325044   21.2 21.2 20.60   ~ 158 1
7 QSO B1830-211 QSO 18 33 39.92 -21 03 39.9     18.70 21   ~ 563 1

    Equat.    Gal    SGal    Ecl

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2021.01.19-16:55:24

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