J/MNRAS/472/1850: Resource Record Summary

Resource Record Summary

Catalog Service:
Detecting damped Ly{alpha} absorbers

Short name: J/MNRAS/472/1850 IVOA Identifier: ivo://CDS.VizieR/J/MNRAS/472/1850Publisher: CDSivo://CDS[Pub. ID] More Info: http://cdsarc.unistra.fr/cgi-bin/cat/J/MNRAS/472/1850 VO Compliance: Level 2: This is a VO-compliant resource.	Status: active Registered: 2020 Aug 11 10:00:09Z
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Description

We develop an automated technique for detecting damped Ly{alpha} absorbers (DLAs) along spectroscopic lines of sight to quasi-stellar objects (QSOs or quasars). The detection of DLAs in large-scale spectroscopic surveys such as SDSS III sheds light on galaxy formation at high redshift, showing the nucleation of galaxies from diffuse gas. We use nearly 50000 QSO spectra to learn a novel tailored Gaussian process model for quasar emission spectra, which we apply to the DLA detection problem via Bayesian model selection. We propose models for identifying an arbitrary number of DLAs along a given line of sight. We demonstrate our method's effectiveness using a large-scale validation experiment, with excellent performance. We also provide a catalogue of our results applied to 162858 spectra from SDSS-III data release 12.

More About this Resource

About the Resource Providers

This section describes who is responsible for this resource

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

Creators:

Garnett R.Ho S.Bird S.Schneider J.

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: 2021 Mar 23 12:34:06Z
Created: 2020 Aug 11 10:00:09Z

This resource was registered on: 2020 Aug 11 10:00:09Z
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: Quasars Redshifted / Redshift
Intended audience or use: Research: This resource provides information appropriate for supporting scientific research.
More Info: http://cdsarc.unistra.fr/cgi-bin/cat/J/MNRAS/472/1850	Literature Reference: 2017MNRAS.472.1850G
Related Resources: Other Related Resources TAP VizieR generic service(IsServedBy) ivo://CDS.VizieR/TAP [Res. ID] Conesearch service(IsServedBy) VII/279 : SDSS quasar catalog: twelfth data release (Paris+, 2017) ivo://CDS.VizieR/VII/279 [Res. ID]

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

	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.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/472/1850

	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.unistra.fr/viz-bin/votable?-source=J/MNRAS/472/1850

	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.u-strasbg.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/MNRAS/472/1850/table1 (The 297301 objects in the SDSS-III DR12Q catalog, and the results of our cuts)

Available endpoints for the standard interface:

http://vizier.unistra.fr/viz-bin/conesearch/J/MNRAS/472/1850/table1?

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.