Mathematics – Logic
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21011404f&link_type=abstract
American Astronomical Society Meeting 210, #114.04; Bulletin of the American Astronomical Society, Vol. 39, p.239
Mathematics
Logic
Scientific paper
Interactions with neighbors may be the dominant process driving galaxy evolution over cosmic time. To disentangle intrinsic from environmental processes, samples of galactic systems with little evidence for current or prior interactions must be developed. Highly isolated systems can then define the zero-interaction baseline for exploring environmental effects on galactic evolution. We are using the Sloan Sky Survey to create such datasets. The SDSS data overcomes a major impediment to prior attempts at defining galaxian environments. Redshifts produced by the spectroscopic component of the SDSS permit a complete description of the local environment surrounding candidate isolated systems.
Using data release 5, we have constructed a searchable database of the spectroscopic component of the survey. Isolated systems are "mined" from this database utilizing a variety of isolation criteria: physical separation in Mpc, differential recessional velocities, brightness limits for dwarf companions. Limiting factors for defining a sample of strongly isolated systems are the spectroscopic limits of the SDSS and the irregular sky coverage pattern, which can produce spurious sources due to the survey edges. In this presentation we describe the morphological, photometric and star formation properties of the most isolated galactic systems found within the SDSS footprint.
Fanelli Michael N.
Fuse Chris
Marcum Pam
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