Finding All the Quasars with GALEX, Even the Ones GALEX Doesn't Detect!

Details Finding All the Quasars with GALEX, Even the Ones GALEX Doesn't Detect! Finding All the Quasars with GALEX, Even the Ones GALEX Doesn't Detect!

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21720604h&link_type=abstract

American Astronomical Society, AAS Meeting #217, #206.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

Traditional "catalog matching" fails when two imaging surveys of very different depth, resolution, or wavelength are being compared, especially for the bulk of sources, which are faint. When there is asymmetry (one survey substantially better than the other in resolution and signal-to-noise), forced photometry in the less-good data set is much to be preferred. The output of such photometry permits "stacking" and other activities that make non-detects just as scientifically valuable as the significant detections. We show that we can enormously improve spectroscopic target selection based on SDSS data by making use of forced photometry in the GALEX pixels, for finding low-redshift (UV-bright), high-redshift (UV-faint), and He-II emitting (high-redshift but anomalously UV-bright) quasars, among many other things.

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