Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.0213s&link_type=abstract
American Astronomical Society Meeting 210, #02.13; Bulletin of the American Astronomical Society, Vol. 39, p.95
Astronomy and Astrophysics
Astronomy
Scientific paper
Peak quasar activity is found to occur between redshifts of z=2 to 3, although selection of quasars in this range of redshifts is incomplete in most optical surveys. Here, we are utilizing infrared data to better search for quasars of redshifts z=2 to 3 by cross matching optical data from the Digitized Palomar Observatory Sky Survey (DPOSS) and infrared data from the 2 Micron All Sky Survey (2MASS). We have computed colors for each matched object and plotted the matched objects in various color spaces. We have also computed the expected colors of synthetic quasar spectra in the DPOSS and 2MASS passbands to identify the expected colors of quasars at z=2 to 3. We have selected objects as quasar candidates whose colors diverge from the stellar locus of stars and with colors in the same region of color space as our synthetic quasar spectra. We then check these objects against the Sloan Digital Sky Survey (SDSS) to determine if spectral analysis has been performed to determine their nature and, if not, those objects will be considered as candidates for follow-up spectroscopy. With this spectroscopy, we will determine if the addition of infrared imaging to optical surveys improves the selection of quasars at z=2 to 3, thereby improving the accuracy of determinations of quasar space densities at these redshifts. This work was funded by an NSF ADVANCE Fellowship, an NVO Research Initiative Grant, and an Arkansas CSAPS Research Grant.
Bursick Shelly
Djorgovski Stanislav
Glikman Eilat
Kennefick Julia
Stewart Ashley
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