AAS 207th Meeting, 8-12 January 2006
Session 188 Galaxy Anatomy: from Bars to Halos
Poster, Thursday, 9:20am-4:00pm, January 11, 2006, Exhibit Hall

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[188.07] The Structural Parameters of Stellar Disks in Edge-on Galaxies from 2MASS Images.

S. Mitronova (SAO RAS), D. Bizyaev (NOAO, SAI)

We analyze J, H, and Ks 2MASS images of 140 late-type edge-on galaxies selected from the RFGC catalog (which contains flat galaxies with major-to-minor axis ratio a/b > 7). The NIR scalelengths (z0) and scaleheights (h) of the stellar disks are determined for all selected galaxies. The mean relative ratios of the scaleheights of their stellar disks are 1.00:0.91:0.84 in J:H:Ks bands, respectively. We conclude that the scaleheight determined from the Ks-band images is, on average, 13% larger than the extinction-free scaleheight. This difference is much larger when the scaleheights are found from the optical band images. The relative thickness (z0/h) of the stellar disks correlates well with their deprojected central surface brightness obtained from the 2MASS images. This project is partially supported by grant RFBR 04-02-16518.

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