Gas‐rich Dwarfs from the PSS‐II. III. H i Profiles and Dynamical Masses | Zendy

J. Eder | Zendy; James M. Schombert | Zendy

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Gas‐rich Dwarfs from the PSS‐II. III. H i Profiles and Dynamical Masses

Author(s) -

J. Eder,

James M. Schombert

Publication year - 2000

Publication title -

the astrophysical journal supplement series

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.546

H-Index - 277

eISSN - 1538-4365

pISSN - 0067-0049

DOI - 10.1086/317357

Subject(s) - physics , astrophysics , luminosity , baryon , galaxy , dark matter , baryonic dark matter , range (aeronautics) , dwarf galaxy , brown dwarf , astronomy , stars , dark matter halo , halo , materials science , composite material

We present Arecibo neutral hydrogen data on a sample of optically selecteddwarf galaxies. The sample ranges in HI mass from 10^6 M_sun to 5x10^9 M_sun,with a mean of 7.9x10^8 M_sun. Using estimated HI radii, the HI surfacedensities range from 0.6 to 20 M_sun pc^-2, all well below the criticalthreshold for star formation (Kennicutt 1998). M_HI/L values of the LSB dwarfsrange from 0.3 to 12 with a mean value of 2.0. Dynamical masses, calculatedfrom the HI profile widths, range from 10^8 M_sun to 10^11 M_sun. There is astrong correlation between optical luminosity and dynamical mass for LSB dwarfsimplying that the dark matter (whether baryonic or non-baryonic) follows thedetectable baryonic matter.

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