A4: Resource Record Summary

Resource Record Summary

Catalog Service:
HEAO 1 A4 Catalog of High-Energy X-Ray Sources

Short name: A4 IVOA Identifier: ivo://nasa.heasarc/a4Publisher: NASA/GSFC HEASARCivo://nasa.heasarc/ASD[Pub. ID] More Info: https://heasarc.gsfc.nasa.gov/W3Browse/all/a4.html VO Compliance: Level 2: This is a VO-compliant resource.	Status: active Registered: 2024 Sep 27 00:00:00Z
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Description

The HEAO 1 A-4 Catalog of High-Energy X-ray Sources represents results from an all-sky survey carried out at high X-ray energies (13-180 keV) from August 1977 until January 1979 using data obtained with the UCSD/MIT Hard X-Ray and Low-Energy Gamma-Ray Instrument on the HEAO 1 satellite. Quantitative results from a model-dependent fitting procedure are given in the form of fitted count rates in four broad energy bands for about 70 sources. The survey is complete, except in regions of source confusion, down to an intensity level of about 1/75 of the Crab Nebula in the 13-80 keV energy band. Forty-four sources were detected in the 40-80 keV energy band, and 14 in the 80-180 keV band. Most of the sources are galactic; seven are extragalactic. This is a service provided by NASA HEASARC .

More About this Resource

About the Resource Providers

This section describes who is responsible for this resource

Publisher: NASA/GSFC HEASARCivo://nasa.heasarc/ASD[Pub. ID]

Creator: Levine et al. Contributor:

Contact Information:

X NASA/GSFC HEASARC help desk
Email:

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 apparently provides only public data

Relevant dates for this Resource:

Representative: 2024 Sep 27

This resource was registered on: 2024 Sep 27 00:00:00Z
This resource description was last updated on: 2024 Sep 27 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: Archive	Subject keywords: Survey Source This service provides data from: facility: HEAO1
Intended audience or use: Research: This resource provides information appropriate for supporting scientific research.
More Info: https://heasarc.gsfc.nasa.gov/W3Browse/all/a4.html	Literature Reference: 1984ApJS...54..581L
Related Resources: Services that provide access to data in this resource: HEASARC TAP ivo://nasa.heasarc/services/xamin [Res. ID]

	Data Coverage Information
	This section describes the data's coverage over the sky, frequency, and time. Reference Coordinate System: UTC-ICRS-TOPOXXivo://STClib/CoordSys#UTC-ICRS-TOPO[Res. ID] Sky Coverage: Regions covered: All-sky: The data from this resource is distributed over the entire sky. Typical Size Scale (Region of Regard): , 1 deg Wavebands covered: X-ray

Available Service Interfaces

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.
Available endpoints for the standard interface:

https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=a4&

Maximum search radius accepted: 180 degrees
Maximum number of matching records returned: 99999

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

	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: https://heasarc.gsfc.nasa.gov/xamin/vo/tap

	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: https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=a4

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: https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_a4&Action=More+Options&Action=Parameter+Search&ConeAdd=1