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On the general structure of giant low surface brightness galaxy Malin 2

Published online by Cambridge University Press:  17 July 2013

A. S. Saburova ,
A. V. Kasparova ,
I. Yu. Katkov ,
D. V. Bizyaev  and
I. V. Chilingarian
A. S. Saburova
Affiliation:
Sternberg Astronomical Institute of Moscow State University, Universitetskii pr. 13, 119992, Moscow, Russia email: [email protected]
A. V. Kasparova
Affiliation:
Sternberg Astronomical Institute of Moscow State University, Universitetskii pr. 13, 119992, Moscow, Russia email: [email protected]
I. Yu. Katkov
Affiliation:
Sternberg Astronomical Institute of Moscow State University, Universitetskii pr. 13, 119992, Moscow, Russia email: [email protected]
D. V. Bizyaev
Affiliation:
Sternberg Astronomical Institute of Moscow State University, Universitetskii pr. 13, 119992, Moscow, Russia email: [email protected] New Mexico State University and Apache Point Observatory, Sunspot, NM 88349, USA
I. V. Chilingarian
Affiliation:
Sternberg Astronomical Institute of Moscow State University, Universitetskii pr. 13, 119992, Moscow, Russia email: [email protected] Smithsonian Astrophysical Observatory, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138USA
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Abstract

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We carried out the multicolor surface photometry in BVR and griz filters parallel with stellar kinematic measurements from the long slit spectra for the low surface brightness galaxy Malin 2. The use of the multicolor surface photometry as well as the available HI rotation curve allowed us to construct the mass distribution model of the galaxy. Photometrical and dynamical mass estimates agree with the dark halo mass fraction of about 70% within four disc radial scalelengths (~ 70 kpc). We used our dynamical model to obtain radial profiles of the equilibrium disc volume density and gas pressure in the galaxy midplane based on the available HI and CO data. The observed molecular gas fraction appears to be much higher than in the high surface brightness galaxies for a similar gas pressure.

Keywords

Galaxies: evolutionGalaxies: formationGalaxies: individual: Malin 2
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S295: The intriguing life of massive galaxies , August 2012 , pp. 236
Copyright
Copyright © International Astronomical Union 2013 

References

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Pickering, T. E., Impey, C. D., van Gorkom, J. H., & Bothun, G. D. 1997, AJ, 114, 1858Google Scholar
Kasparova, A. 2012 Astron. Lett., 38, 63Google Scholar