Chandra and ROSAT Observations of NGC 5044: Profile of Dark Halos in Galaxy Groups

Details Chandra and ROSAT Observations of NGC 5044: Profile of Dark Halos in Galaxy Groups Chandra and ROSAT Observations of NGC 5044: Profile of Dark Halos in Galaxy Groups

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006pasj...58..103b&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.58, No.1, pp. 103-112

Astronomy and Astrophysics

Astronomy

5

Cosmology: Dark Matter, Galaxies: Halos, Galaxies: Individual (Ngc 5044), X-Rays: Galaxies

Scientific paper

We combined spatially resolved Chandra data with the ROSAT data to constrain the dark-matter distribution in the galaxy group NGC 5044. Within 250 h-150kpc, the total mass is found to be ˜ 1.6 × 1013 M&sun;, 12% of which constitutes baryonic mass. Within the inner central regions, the total mass profile exhibits a double structure, typical for groups containing a cD galaxy. Following previous studies of mostly rich galaxy clusters, we studied in detail the nature of such a double structure, whereby we inferred likely interface between the cD galaxy and the surrounding galaxies. For this interesting group, we determined for the first time the galaxy-group interface, which is around 7.5kpc from the peak of the X-ray emission. The total mass internal to this interface radius is found to be ˜ 7.1 × 1010 M&sun;. Beyond this radius, the total mass profile becomes DM-dominated and the corresponding DM profile is reasonably fitted with the NFW model, yielding results consistent with the observed scatter expected for CDM halos. A power-law fit to the DM mass profile gives α = 1.88 ± 0.32, a slope that is within the observed range, but is significantly larger than that of low surface brightness galaxies and self-interacting DM halos.

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