HEAO 1 A4 Catalog of High-Energy X-Ray Sources Virtual Observatory Resource

Authors

1. Levine et al.

Published by

NASA/GSFC HEASARC

Abstract

      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 .
    

Keywords

1. Survey Source

Bibliographic source

1984ApJS...54..581L

See also HTML

https://heasarc.gsfc.nasa.gov/W3Browse/all/a4.html

IVOA Identifier IVOID

ivo://nasa.heasarc/a4

Access

IVOA Cone Search SCS

For use with a cone search client (e.g., TOPCAT).
https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=a4&

IVOA Table Access TAP

https://heasarc.gsfc.nasa.gov/xamin/vo/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).

Web browser access HTML

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