2005A&A...440..893H


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET05:08:57

2005A&A...440..893H - Astronomy and Astrophysics, volume 440, 893-899 (2005/9-4)

The kinetic temperature of a molecular cloud at redshift 0.7: ammonia in the gravitational lens B0218+357.

HENKEL C., JETHAVA N., KRAUS A., MENTEN K.M., CARILLI C.L., GRASSHOFF M., LUBOWICH D. and REID M.J.

Abstract (from CDS):

Using the Effelsberg 100-m telescope, absorption in the (J,K) = (1,1), (2,2) and (3,3) inversion lines of ammonia (NH3) was detected at a redshift of z=0.6847 toward the gravitational lens system B0218+357. The λ∼2cm absorption peaks at 0.5-1.0% of the continuum level and appears to cover a smaller fraction of the radio continuum background than lines at millimeter wavelengths. Measured intensities are consistent with a rotation temperature of ∼35K, corresponding to a kinetic temperature of ∼55K. The column density toward the core of image A then becomes N(NH3)∼1x1014cm–2 and fractional abundance and gas density are of order X(NH3)∼10–8 and n(H2)∼5x103cm–3, respectively. Upper limits are reported for the (2,1) and (4,4) lines of NH3 and for transitions of the SO, DCN, OCS, SiO, C3N, H2CO, SiC2, HC3N, HC5N, and CH3OH molecules. These limits and the kinetic temperature indicate that the absorption lines are not arising from a cold dark cloud but from a warm, diffuse, predominantly molecular medium. The physical parameters of the absorbing molecular complex, seen at a projected distance of ∼2kpc to the center of the lensing galaxy, are quite peculiar when compared with the properties of clouds in the Galaxy or in nearby extragalactic systems.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - galaxies: ISM - quasars: individual: B0218+357 - quasars: absorption lines - lines: galaxies radio

Simbad objects: 11

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Number of rows : 11

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 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3000 2
2 [PBK93] B0218+357 A2 LeI 02 21 +35.9           ~ 9 0
3 [PBK93] B0218+357 A1 LeI 02 21 +35.9           ~ 9 0
4 RORF 0218+35A LeI 02 21 05.4667 +35 56 13.730           ~ 33 0
5 QSO B0218+357 QSO 02 21 05.5 +35 56 14   20.0 20.0 19.60   ~ 513 2
6 RORF 0218+35B LeI 02 21 05.5 +35 56 14           ~ 30 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15205 1
8 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 889 1
9 NAME Mon R 2 GMC MoC 06 07.6 -06 23           ~ 23 1
10 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5426 6
11 NGC 7027 PN 21 07 01.8 +42 14 10   9.1 10.9     ~ 2353 1

    Equat.    Gal    SGal    Ecl

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2021.03.03-05:08:57

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