VizieR Online Data Catalog: Candidate type II QSOs in SDSS III (Alexandroff+, 2013)
Abstract
For our parent sample, we selected all BOSS objects in DR9 with both Lyα and CIV emission-line measurements (given the BOSS wavelength coverage, this corresponds to redshifts of z>~2.0) and a reliable pipeline fit. From this sample, we selected only those objects with 5σ detections in both Lyα and CIV (thus we are insensitive to objects that emit only in Lyα, and restricted ourselves to those objects in which both lines have FWHM<2000km/s.
We classified our type II quasar candidates, after removing the BAL quasars and obvious NLS1, in two categories: those that showed all the qualities of an obscured quasar (narrow emission lines, no associated absorption, weak continuum), hereafter class A; and those with one or more characteristics of unobscured objects (a broad component to an emission line, an absorption feature or a strong blue continuum), hereafter class B. (4 data files).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- October 2014
- Bibcode:
- 2014yCat..74353306A
- Keywords:
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- QSOs;
- Equivalent widths;
- Photometry: infrared