'Scraggy' dark halos around bulge-less spiral galaxies
arXiv:1904.13155 · doi:10.1093/mnras/stz1047
Abstract
We use a sample of 220 face-on bulge-less galaxies situated in the low density environment to estimate their total mass via orbital motions of supposed rare satellites. Our inspection reveals 43 dwarf companions having the mean projected separation of 130 kpc and the mean-square velocity difference of 96 km/s. For them, we obtain the mean orbital-mass-to-K-band luminosity ratio of . Seven bulge-less spirals in the Local Volume are also characterized by the low mean ratio, . We conclude that bulge-less Sc-Scd-Sd galaxies have poor dark halos, about two times lower than that of bulgy spiral galaxies of the same stellar mass.
arXiv comment7 pages, 2 figures, 3 tables, accepted for publication in MNRAS
References in corpus (12)
- Secular Evolution and the Formation of Pseudobulges in Disk Galaxies
- HyperLEDA. III. The catalogue of extragalactic distances
- Updated Nearby Galaxy Catalog
- Bulgeless Giant Galaxies Challenge our Picture of Galaxy Formation by Hierarchical Clustering
- The Orbital Ellipticity of Satellite Galaxies and the Mass of the Milky Way
- HI Imaging Observations of Superthin Galaxies. I. UGC7321
- Orbital masses of nearby luminous galaxies
- Why are some galaxy disks extremely thin?
- Ultra-Flat Galaxies Selected from RFGC Catalog. I. The Sample Properties
- Ultra-Flat Galaxies Selected from RFGC Catalog. II. Orbital Estimates of Halo Masses
- Ultra-Flat Galaxies Selected from RFGC Catalog. III. Star Formation Rate
- A reference sample of face-on bulgeless galaxies