2005A&A...444..813P


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET22:24:25

2005A&A...444..813P - Astronomy and Astrophysics, volume 444, 813-819 (2005/12-4)

A sensitive search for CO J=1-0 emission in 4C 41.17: high-excitation molecular gas at z=3.8.

PAPADOPOULOS P.P., GREVE T.R., IVISON R.J. and DE BREUCK C.

Abstract (from CDS):

We report sensitive imaging observations of the CO J=1-0 line emission in the powerful high-redshift radio galaxy 4C41.17 (z=3.8) with the NRAO Very Large Array (VLA), conducted in order to detect the large concomitant H2 gas reservoir recently unveiled in this system by De Breuck et al.(2005) via the emission of the high excitation J=4-3 line. Our observations fail to detect the J=1-0 line but yield sensitive lower limits on the R43=(4-3)/(1-0) brightness temperature ratio of R43∼0.55-γ1.0 for the bulk of the H2 gas mass. Such high ratios are typical of the high-excitation molecular gas phase ``fueling'' the star formation in local starbursts, but quite unlike these objects, much of the molecular gas in 4C41.17 seems to be in such a state, and thus participating in the observed starburst episode. The widely observed and unique association of highly excited molecular gas with star forming sites allows CO line emission with large (high-J)/(low-J) intensity ratios to serve as an excellent ``marker'' of the spatial distribution of star formation in distant dust-obscured starbursts, unaffected by extinction.

Abstract Copyright:

Journal keyword(s): galaxies: individual: 4C41.17 - galaxies: active - galaxies: formation - ISM: molecules

Simbad objects: 8

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Number of rows : 8

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 ~ 2998 2
2 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1404 1
3 4C 60.07 rG 05 12 54.80 +60 30 51.7           ~ 88 1
4 7C 064253.00+445430.00 QSO 06 46 32.02599463 +44 51 16.5901237   19.57 18.49 18.64   ~ 326 1
5 4C 41.17 rG 06 50 52.098 +41 30 30.53           ~ 317 1
6 QSO B0710+439 QSO 07 13 38.16412910 +43 49 17.2071530   20.7       ~ 233 0
7 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5422 6
8 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3839 2

    Equat.    Gal    SGal    Ecl

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2021.02.26-22:24:25

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