SIMBAD references

2006PASJ...58..103B - Publ. Astron. Soc. Jap., 58, 103-112 (2006/February-0)

Chandra and ROSAT observations of NGC 5044: profile of dark halos in galaxy groups.


Abstract (from CDS):

begin{HTML} 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<sup>-1</sup><sub>50</sub>kpc, the total mass is found to be ∼ 1.6 x 10<sup>13</sup> M<sub>☉</sub>, 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 x 10<sup>10</sup> M<sub>☉</sub>. 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 a = 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.

Abstract Copyright:

Journal keyword(s): cosmology: dark matter - galaxies: halos - galaxies: individual: NGC 5044 - X-rays: galaxies

Status at CDS:  

Simbad objects: 7

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