J/ApJ/633/638: Resource Record Summary

Resource Record Summary

Catalog Service:
Variable quasar sample from SDSS

Short name: J/ApJ/633/638 IVOA Identifier: ivo://CDS.VizieR/J/ApJ/633/638 DOI (Digital Object Identifier): 10.26093/cds/vizier.16330638 Publisher: CDSivo://CDS[Pub. ID] More Info: https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/633/638 VO Compliance: Level 2: This is a VO-compliant resource.	Status: active Registered: 2014 Nov 12 13:38:06Z
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Description

SDSS repeat spectroscopic observations have resulted in multiepoch spectroscopy for 2500 quasars observed more than 50 days apart. From this sample, calibrating against stars observed simultaneously, we identify 315 quasars that have varied significantly between observations (with respect to assumed nonvariable stars observed concurrently). These variable quasars range in redshift from 0.5 to 4.72. This is the first large quasar sample studied spectroscopically for variability and represents a potentially useful sample for future high-redshift reverberation mapping studies. This also marks the first time the precise wavelength dependence of quasar variability has been determined, allowing both the continuum and emission-line variability to be studied.

More About this Resource

About the Resource Providers

This section describes who is responsible for this resource

Publisher: CDSivo://CDS[Pub. ID]

Creators:

Wilhite B.C.Vanden Berk D.E.Kron R.G.Schneider D.P.Pereyra N.Brunner R.J.Richards G.T.Brinkmann J.V.

Contact Information:

X CDS support team
Email: cds-question at unistra.fr
Address: CDS
Observatoire de Strasbourg
11 rue de l'Universite
F-67000 Strasbourg
France

Status of This Resource

This section provides some status information: the resource version, availability, and relevant dates.

Version: n/a
Availability: This is an active resource.

This service provides only public data.

Relevant dates for this Resource:

Updated: 2018 Jan 05 08:55:46Z
Created: 2014 Nov 12 13:38:06Z

This resource was registered on: 2014 Nov 12 13:38:06Z
This resource description was last updated on: 2021 Oct 21 00:00:00Z

What This Resource is About

This section describes what the resource is, what it contains, and how it might be relevant.

Resource Class: CatalogService: This resource is a service that provides access to catalog data. You can extract data from the catalog by issuing a query, and the matching data is returned as a table.

Resource type keywords: Catalog	Subject keywords: Active galactic nuclei Photometry Optical astronomy Sloan photometry Quasars Redshifted
Intended audience or use: Research: This resource provides information appropriate for supporting scientific research.
More Info: https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/633/638	Literature Reference: 2005ApJ...633..638W
Related Resources: Other Related Resources TAP VizieR generic service(IsServedBy) ivo://CDS.VizieR/TAP [Res. ID] Conesearch service(IsServedBy) VII/270 : SDSS quasar catalog: tenth data release (Paris+, 2014) ivo://CDS.VizieR/VII/270 [Res. ID]

	Data Coverage Information
	This section describes the data's coverage over the sky, frequency, and time. Wavebands covered: Optical

	Rights and Usage Information
	This section describes the rights and usage information for this data. Rights:

Available Service Interfaces

	Custom Service
	This is service that does not comply with any IVOA standard but instead provides access to special capabilities specific to this resource. VO Compliance: Level 2: This is a VO-compliant resource. Available endpoints for this service interface: Interactive web page: http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/633/638

	Custom Service
	This is service that does not comply with any IVOA standard but instead provides access to special capabilities specific to this resource. VO Compliance: Level 2: This is a VO-compliant resource. Available endpoints for this service interface: URL-based interface: http://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/633/638

	Table Access Protocol - Auxiliary ServiceXX
	This is a standard IVOA service that takes as input an ADQL or PQL query and returns tabular data. VO Compliance: Level 2: This is a VO-compliant resource. Available endpoints for the standard interface: http://tapvizier.cds.unistra.fr/TAPVizieR/tap

Simple Cone SearchXXSearch Me

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.

VO Compliance: Level 2: This is a VO-compliant resource.
Description:

Cone search capability for table J/ApJ/633/638/table2 (Variable quasar sample)

Available endpoints for the standard interface:

http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/633/638/table2?

Maximum search radius accepted: 180.0 degrees
Maximum number of matching records returned: 50000

This service supports the VERB input parameter:: Use VERB=1 to minimize the returned columns or VERB=3 to maximize.