A cosmologically motivated description of the dark matter halo profile for the Low Surface Brightness Galaxy, Malin 1

Abstract

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 \ion{H}{1} 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 $\sim 10$ kpc (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 also 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.

10 pages, 3 figures (1 color), accepted for publication in PASP

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• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Mass Models for Low Surface Brightness Galaxies with High Resolution Optical Velocity Fields
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• A Normal Stellar Disk in the Galaxy Malin 1
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• Malin 1: A Deeper Look
• Outer edges of face-on spiral galaxies

Cited by in corpus (5)

• Deep optical images of Malin 1 reveal new features
• Constraining dark matter halo profiles and galaxy formation models using spiral arm morphology. II. Dark and stellar mass concentrations for 13 nearby face-on galaxies
• The dark matter halo density profile, spiral arm morphology and black hole mass of M33
• Malin 1: interacting galaxy pair?
• The role of the elaphrocentre in void galaxy formation