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Title: Constraining the age of the NGC 4565 H I disk WARP: Determining the origin of gas WARPS

We have mapped the distribution of young and old stars in the gaseous H I warp of NGC 4565. We find a clear correlation of young stars (<600 Myr) with the warp but no coincident old stars (>1 Gyr), which places an upper limit on the age of the structure. The formation rate of the young stars, which increased ∼300 Myr ago relative to the surrounding regions, is (6.3{sub −1.5}{sup +2.5})×10{sup −5} M {sub ☉} yr{sup –1} kpc{sup –2}. This implies a ∼60 ± 20 Gyr depletion time of the H I warp, similar to the timescales calculated for the outer H I disks of nearby spiral galaxies. While some stars associated with the warp fall into the asymptotic giant branch (AGB) region of the color-magnitude diagram, where stars could be as old as 1 Gyr, further investigation suggests that they may be interlopers rather than real AGB stars. We discuss the implications of these age constraints for the formation of H I warps and the gas fueling of disk galaxies.
Authors:
; ;  [1] ; ;  [2] ; ;  [3] ;  [4] ;  [5] ;  [6]
  1. Department of Astronomy, University of Washington, Seattle, WA 98195 (United States)
  2. Leibniz-Institut für Astrophysik Potsdam, D-14482 Potsdam (Germany)
  3. Department of Astronomy, University of Michigan, Ann Arbor, MI 48109 (United States)
  4. Raytheon, 1151 East Hermans Road, Tucson, AZ 85756 (United States)
  5. European Space Agency, ESTEC, 2200 AG Noordwijk (Netherlands)
  6. Department of Physics and Astronomy, University of Alabama, Tuscaloosa, AL 35487 (United States)
Publication Date:
OSTI Identifier:
22348279
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 780; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASYMPTOTIC SOLUTIONS; COLOR; CORRELATIONS; DISTRIBUTION; GALAXIES; LIMITING VALUES; STARS