The peculiar dust distribution of M82

Details The peculiar dust distribution of M82 The peculiar dust distribution of M82

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...433..645i&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 433, no. 2, p. 645-647

Astronomy and Astrophysics

Astrophysics

19

Cosmic Dust, Density Distribution, Galactic Nuclei, Galactic Structure, H I Regions, Interstellar Extinction, Mass Distribution, Starburst Galaxies, Astronomical Photometry, Carbon Monoxide, Charge Coupled Devices, Galactic Halos

Scientific paper

We found peculiar dust lanes located at high galactic latitude in the starburst galaxy M82, based on wide-field (12.5 min x 12.8 min) CCD imaging in the BVRcIc bands. The dust lanes, which bisect the galactic center, extend to z approximately = 1.6 min (1.5 kpc at a distance of 3.3 Mpc) above and below the fundamental plane and out to 5.3-6.5 min (5.1-6.2 kpc) parallel to the major axis. The average color excess at z = 0.5-1 kpc corresponds to Av approximately = 0.22 mag in the northern half of the galaxy and to approximately 0.35 mag in the south. The local N(H I + 2H2)/Av ratio high above the galactic plane is 1.0-6.7 x 1021/((sq cm)(mag)), comparable to the Galactic value. The total estimated gas mass at absolute value of z greater than 0.5 and less than 1 kpc is about 4.9 x 107 solar masses, adopting N(H)/Av = 4 x 1021/((sq cm(mag)). The densest part of the dust ridge to the south of the galactic center is closely correlated with the CO distribution, and the overall dust distribution follows the warped, flaring S-shaped H I gas disk to the NE and SW as well as the peculiar H I features towards the NW and NE. We find that the small circumnuclear arc noticed earlier in color excess and emission line images is actually part of a much larger structure extending toward the halo. The debris of dust clouds at the NE edge of the disk is likely to be related to the warping of H I gas distribution as well.

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