Mathematics – Logic
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.9102k&link_type=abstract
American Astronomical Society Meeting 203, #91.02; Bulletin of the American Astronomical Society, Vol. 35, p.1352
Mathematics
Logic
Scientific paper
A quantitative determination of the distribution of Hα -emitting gas in normal spiral galaxies is necessary to understand the laws of star formation in spiral disks, the star formation history of the universe, and how galaxy evolution and environment may impact studies of fundamental galaxy properties traced by H-alpha emission. Published studies have presented conflicting results on the coupling of stars and the sites of massive star formation traced by Hα . Kennicutt (1989) found for 14 spirals that Hα scale lengths, measured from HII region distributions, are comparable to broadband scale lengths. Ryder and Dopita (1994) fit scale lengths to Hα surface brightness profiles for a larger sample of 34 spirals, finding Hα scale lengths 75% longer on average than in either broadband V or I.
The relative scale lengths of stars and ionized gas are therefore reexamined in a larger sample of 100 Virgo Cluster and field spiral galaxies, via Hα and broadband R surface photometry. Results will be searched for trends in relative scale lengths as a function of morphological type, central light concentration, and environment.
The Hα scale lengths and extents derived from the imaging data will be compared to the extent of rotation curves derived from long-slit optical spectroscopy for a subset of 78 objects to investigate the effects of spatial inhomogeneity in the ionized gas distribution on rotational velocity widths derived from optical spectroscopy. The Hα scale lengths will be used to constrain simulations undertaken by Catinella et al. who are modeling the effects of aperture bias in rotational width measurements derived from the Sloan Digital Sky Survey.
No associations
LandOfFree
Scale Lengths of Stars and Ionized Gas in 100 Virgo Cluster and Field Spirals does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Scale Lengths of Stars and Ionized Gas in 100 Virgo Cluster and Field Spirals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scale Lengths of Stars and Ionized Gas in 100 Virgo Cluster and Field Spirals will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1421932