Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541510r&link_type=abstract
American Astronomical Society, AAS Meeting #215, #415.10; Bulletin of the American Astronomical Society, Vol. 42, p.262
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The interstellar thick disks of spiral galaxies contain all of the phases of the interstellar medium found in the thin disk, including a cold dense phase. We present evidence for thick disk star formation in three spiral galaxies. Our LBT, WIYN, and Hubble Space Telescope imaging of these galaxies reveals numerous extraplanar H II regions and associated stellar continuum light from the underlying young stars. We also present confirming spectroscopy from the Keck and Lick observatories for extraplanar H II regions in the galaxies NGC 4013 and NGC 891. We use these images and spectra to constrain the evolutionary status of the thick disk stellar associations, including their age and massive star content. These observations also provide constraints on the physical conditions in the thick disk interstellar medium. We comment on the use of such spectra as probes of vertical abundance gradients in spiral galaxies.
Howk Chris J.
Rueff Katerine Meredith
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