2007A&A...462L..45G


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.17CEST20:45:44

2007A&A...462L..45G - Astronomy and Astrophysics, volume 462, L45-48 (2007/2-2)

Detection of HNC and tentative detection of CN at z = 3.9.

GUELIN M., SALOME P., NERI R., GARCIA-BURILLO S., GRACIA-CARPIO J., CERNICHARO J., COX P., PLANESAS P., SOLOMON P.M., TACCONI L.J. and VANDEN BOUT P.

Abstract (from CDS):

Molecular line emission from high-redshift galaxies holds great promise for the study of galaxy formation and evolution.The weak signals can only be detected with the largest mm-wave telescopes, such as the IRAM interferometer. We report the detection of the J=5-4 line of HNC and the tentative detection of the N=4-3 line of CN in the quasar APM 08279+5255 at z=3.9. These are the 4th and 5th molecular species detected at such a high redshift. The derived HNC and CN line intensities are 0.6 and 0.4 times that of HCN J=5-4. If HNC and HCN are co-spatial and if their J=5-4 lines are collisionally excited, the [HNC]/[HCN] abundance ratio must be equal to 0.6 within a factor of 2, similar to its value in the cold Galactic clouds and much larger than in the hot molecular gas associated with Galactic HII regions. It is possible, however, that fluorescent infrared radiation plays an important role in the excitation of HNC and HCN.

Abstract Copyright:

Journal keyword(s): galaxies: high-redshift - galaxies: abundances - galaxies: individual: APM 08279+5255 - techniques: interferometric - cosmology: observations

Simbad objects: 9

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Number of rows : 9

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 ~ 3032 2
2 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4218 2
3 NAME Orion Core ? 05 35 14.5 -05 22 30           ~ 180 0
4 * zet Ori A SB* 05 40 45.527143 -01 56 33.26036   1.79 1.90     O9.2IbvarNwk 650 0
5 QSO J0831+5245 QSO 08 31 41.7095363198 +52 45 17.620340544   19.2   14.5 13.9 ~ 503 1
6 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5463 6
7 NGC 3079 Sy2 10 01 57.80342 +55 40 47.2428 11.57 11.54 10.86     ~ 1289 3
8 Mrk 231 Sy1 12 56 14.2340989340 +56 52 25.238555193   14.68 13.84     ~ 1834 3
9 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2754 4

    Equat.    Gal    SGal    Ecl

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