QSOs in the combined SDSS/GALEX database
J. B. Hutchings (HIA), L. Bianchi (JHU)
TL;DR
This paper analyzes the selection and properties of quasars in the combined SDSS and GALEX datasets, addressing uncertainties in counts, completeness, and their spectral energy distributions across redshifts.
Contribution
It presents a detailed examination of quasar selection criteria, properties, and uncertainties in the combined SDSS/GALEX catalog, highlighting challenges in classification and completeness.
Findings
Estimated faint QSO counts as extended objects in SDSS
Identified uncertainties in number counts and completeness
Analyzed color and SED properties across redshift
Abstract
We discuss selection of QSO candidates from the combined SDSS and GALEX catalogues. We discuss properties of QSOs within the combined sample, and note uncertainties in number counts and completeness, compared with other SDSS-based samples. We discuss colour and other properties with redshift within the sample and the SEDs for subsets. We estimate the numbers of faint QSOs that are classified as extended objects in the SDSS, and consequent uncertainties that follow.
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomical Observations and Instrumentation · Astronomy and Astrophysical Research