2013AJ....146..121H -
Astron. J., 146, 121 (2013/November-0)
The mass distribution and M/L ratios in NGC 5953/5954.
HERNANDEZ TOLEDO H.M., MORENO E. and GARCIA-BARRETO J.A.
Abstract (from CDS):
In this first paper, we combine a structural analysis of the near-IR surface brightness profiles and [N II] rotation curves for the galaxies in the pair NGC 5953/5954 to model the mass distribution in each member by using two independent axisymmetric analytical mass models: (1) a standard model given by the sum of a spherical bulge with the Sérsic law, a stellar exponential disk, and a cold dark matter halo represented by the improved fitting formula of Navarro et al.; and (2) a simple model given by the sum of a spherical bulge, a finite oblate spheroid representing the disk, and a spherical dark halo, all three mass components with simple density laws. In our surface brightness fits, a central luminous source is considered in both galaxies. We obtained K-band M/L ratios, ΥD, ΥB, for the disks and bulges, and total masses for each mass component in both galaxies. With the standard model we find in NGC 5953, (ΥD,ΥB) = (0.29–0.29+1, 0.37±0.03) M☉/L☉, and in NGC 5954, (Υ_ D,ΥB_) = (0.88±0.18, 0.21±0.09) M☉/L☉. Corresponding values found with the simple model are (ΥD,Υ_ B_) = (1.41±0.15, 0.29±0.04) M☉/L☉ and (Υ_ D,ΥB_) = (0.51±0.05, 0.52–0.12+0.23) M☉/L☉. Our M/L estimates are compared with predictions from other methods in the literature, finding reasonable agreement. The dark halos estimated using the simple model have a small mass, of the order of 107 M☉, within the maximum distance in the rotation velocity data.
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Journal keyword(s):
galaxies: fundamental parameters - galaxies: interactions - galaxies: kinematics and dynamics - galaxies: photometry - galaxies: spiral - galaxies: structure
Simbad objects:
3
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