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"NASA Technical Reports Server (NTRS) 20140010549: Gas, Stars, And Star Formation In Alfalfa Dwarf Galaxies" and the language of the book is English.


“NASA Technical Reports Server (NTRS) 20140010549: Gas, Stars, And Star Formation In Alfalfa Dwarf Galaxies” Metadata:

  • Title: ➤  NASA Technical Reports Server (NTRS) 20140010549: Gas, Stars, And Star Formation In Alfalfa Dwarf Galaxies
  • Author: ➤  
  • Language: English

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  • Internet Archive ID: NASA_NTRS_Archive_20140010549

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"NASA Technical Reports Server (NTRS) 20140010549: Gas, Stars, And Star Formation In Alfalfa Dwarf Galaxies" Description:

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We examine the global properties of the stellar and Hi components of 229 low H i mass dwarf galaxies extracted from the ALFALFA survey, including a complete sample of 176 galaxies with H i masses <10(sup 7.7) solar mass and Hi line widths <80 kilometers per second. Sloan Digital Sky Survey (SDSS) data are combined with photometric properties derived from Galaxy Evolution Explorer to derive stellar masses (M*) and star formation rates (SFRs) by fitting their UV-optical spectral energy distributions (SEDs). In optical images, many of the ALFALFA dwarfs are faint and of low surface brightness; only 56% of those within the SDSS footprint have a counterpart in the SDSS spectroscopic survey. A large fraction of the dwarfs have high specific star formation rates (SSFRs), and estimates of their SFRs and M* obtained by SED fitting are systematically smaller than ones derived via standard formulae assuming a constant SFR. The increased dispersion of the SSFR distribution at M* approximately less than10(exp 8)M(sub 0) is driven by a set of dwarf galaxies that have low gas fractions and SSFRs; some of these are dE/dSphs in the Virgo Cluster. The imposition of an upper Hi mass limit yields the selection of a sample with lower gas fractions for their M* than found for the overall ALFALFA population. Many of the ALFALFA dwarfs, particularly the Virgo members, have H i depletion timescales shorter than a Hubble time. An examination of the dwarf galaxies within the full ALFALFA population in the context of global star formation (SF) laws is consistent with the general assumptions that gas-rich galaxies have lower SF efficiencies than do optically selected populations and that Hi disks are more extended than stellar ones.

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