2008/07/07 by Marc S. Seigar
Physics and Astronomy · #Astronomy #Astrophysics #Bulge #Cosmology and Gravitation Theories #Dark matter #Dark matter halo #Disc #Elliptical galaxy #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy rotation curve #Halo #Physics #Spiral galaxy #Stellar, planetary, and galactic studies #Surface brightness #astro-ph
paper · pdf · doi:10.1086/591621
10 pages, 3 figures (1 color), accepted for publication in PASP
arxiv created 2008/07/07 · openalex publication_date 2008/08/15 · arxiv updated 2015/05/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
In this paper we derive a possible mass profile for the low surface brightness galaxy, Malin 1, based upon previously published space-based and ground-based photometric properties and kinematics. We use properties of the bulge, normal disk, outer extended disk, and H i mass as inputs into mass profile models. We find that the dark matter halo model of Malin 1 is best described by a halo profile that has undergone adiabatic contraction, inconsistent with the findings for most disk galaxies to date, yet consistent with rotation curve studies of M31. More importantly, we find that Malin 1 is baryon dominated in its central regions out to a radius of (in the bulge region). Low surface brightness galaxies are often referred to as being dark matter dominated at all radii. If this is the case, then Malin 1 would seem to have characteristics similar to those of normal barred disk galaxies, as suggested by other recent work. We also find that Malin 1 falls on the rotation curve shear versus spiral arm pitch angle relation for normal galaxies, although more LSB galaxies need to be studied to determine if this is typical.