2005A&A...438..533W


Query : 2005A&A...438..533W

2005A&A...438..533W - Astronomy and Astrophysics, volume 438, 533-544 (2005/8-1)

The spectral energy distribution of CO lines in M82.

WEISS A., WALTER F. and SCOVILLE N.Z.

Abstract (from CDS):

We present an analysis of the excitation conditions of the molecular gas in the streamers and the outflow of M82 based on observations obtained at the IRAM 30m telescope. Our analysis of J=1-0 and J=2-1 transitions of CO and 13CO and the CO(J=3-2) line in 13 regions outside the central starburst disk shows that the gas density within the streamer/outflow system is about an order of magnitude lower (log(nH2)≃3.0cm–3) than in the central molecular disk. We have used an LVG model and data from the literature to constrain the flux density in each CO transition (the ``CO line SED'') arising from the streamer/outflow system and the central starburst disk itself. Globally, we find that the CO flux density up to the J=3-2 line is dominated by the diffuse outer regions while lines above the J=5-4 transition are almost exclusively emitted by the central starburst disk. We compare the CO line SED of M82 to CO observations of galaxies at high redshift and suggest that small high-J/low-J CO flux density ratios (observed in some of these sources) are not necessarily caused by a different excitation of the central molecular gas concentration, but may result from an additional, more extended and diffuse gas reservoir around these systems, reminiscent of the situation in M82.

Abstract Copyright:

Journal keyword(s): ISM: molecules - galaxies: halos - galaxies: high-redshift - galaxies: individual: M82 - galaxies: ISM - galaxies: starburst

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 - 2022
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3125 2
2 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1451 1
3 4C 71.07 QSO 08 41 24.3652863600 +70 53 42.171665460     16.5 16.8   ~ 727 1
4 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5585 6
5 6C 095456+654857 BLL 09 58 47.2451872176 +65 33 54.819354600     17.0 15.75   ~ 650 1
6 SDSS J114816.64+525150.3 QSO 11 48 16.647 +52 51 50.31   25.73 25.04     ~ 422 0
7 QSO B1202-074 QSO 12 05 23.1360370080 -07 42 32.759842896     17.5     ~ 360 5
8 NAME SMM J14011+0252 GiC 14 01 04.95 +02 52 24.0           ~ 152 1
9 NAME SMM J163650.43+405734.5 AGN 16 36 50.5 +40 57 34   23.3 23.30   21.83 ~ 83 0
10 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2373 2
11 QSO J2322+1944 QSO 23 22 07.164 +19 44 22.98     18.29     ~ 71 0

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2022.05.27-23:12:49

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