Catalog Service: Optically selected BL Lac objects from SDSS-DR7
Description
We present a sample of 723 optically selected BL Lac candidates from the Sloan Digital Sky Survey Data Release 7 (SDSS DR7) spectroscopic database encompassing 8250deg^2^ of sky; our sample constitutes one of the largest uniform BL Lac samples yet derived. Each BL Lac candidate has a high-quality SDSS spectrum from which we determine spectroscopic redshifts for ~60% of the objects. Redshift lower limits are estimated for the remaining objects utilizing the lack of host galaxy flux contamination in their optical spectra; we find that objects lacking spectroscopic redshifts are likely at systematically higher redshifts.
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Publisher: CDSivo://CDS[Pub. ID]
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This resource was registered on: 2012 May 29 09:19:09ZThis resource description was last updated on: 2021 Oct 21 00:00:00Z
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This section describes the data's coverage over the sky, frequency, and time.
Wavebands covered:
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This is service that does not comply with any IVOA standard but instead provides access to special capabilities specific to this resource.
This is a standard IVOA service that takes as input an ADQL or PQL query and returns tabular data.
This is a standard IVOA service that takes as input a position in the sky and a radius and returns catalog records with positions within that radius.
Cone search capability for table J/AJ/139/390/Rloud (Observed and derived parameters of radio-loud BL Lac candidates)
VERB=1
VERB=3
Cone search capability for table J/AJ/139/390/Rquiet (Observed and derived parameters of weak-featured radio-quiet objects)
Developed with the support of the National Science Foundation under Cooperative Agreement AST0122449 with the Johns Hopkins University The NAVO project is a member of the International Virtual Observatory Alliance
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