2000A&A...358...65T

Query : 2000A&A...358...65T

2000A&A...358...65T - Astronomy and Astrophysics, volume 35865-71 (2000/6-1)

Cold dust in the starburst galaxy M 82.

THUMA G., NEININGER N., KLEIN U. and WIELEBINSKI R.

Abstract (from CDS):

The starburst galaxy M 82 has been mapped at λ1.2mm using the IRAM 30-m telescope and the MPIfR 19-channel bolometer. The influence of the sidelobe pattern and the 12CO(2-1) line has been carefully analyzed. Based on this analysis, we conclude that the cold dust does not extend far into the halo as has been previously claimed. The total mass of dust in the inner 3kpc of the galaxy is 7.5x106M☉. Assuming a solar gas-to-dust ratio, the inferred total mass of gas is 7.5x108M☉ . Unlike in any other galaxy we find the CO(2-1) line emission to be clearly more extended than the λ1.2mm dust emission. A likely explanation for this exceptional behaviour, seen for the first time in galaxies, is heating of molecular gas by low-energy cosmic rays and soft X-rays in the halo of M 82.

Abstract Copyright: ∼

Journal keyword(s): ISM: dust, extinction - galaxies: individual: M 82 - galaxies: ISM - galaxies: starburst - radio continuum: galaxies - radio continuum: ISM

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
2 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
3 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 6022 1
4 NGC 4565 Sy2 12 36 20.804 +25 59 14.61   13.61 12.43     ~ 991 0
5 US 371 BLL 13 10 28.66385420 +32 20 43.7828340   15.61 15.24 17.91   ~ 917 1
6 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 807 0

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