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181. HEAO 1 A2 Pointing Catalog
ID:
ivo://nasa.heasarc/a2point
Title:
HEAO 1 A2 Pointing Catalog
Short Name:
A2POINT
Date:
18 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
The HEAO 1 A-2 Pointing Catalog of High-Energy X-ray Sources is the result of a study of selected targets using the three detectors of the A-2 Experiment. The detectors consisted of the HED (high energy detector) in the range 3-6 KeV, the MED (medium energy detector) in the range 1.5-15 KeV, and the LED (low energy detector) in the range 0.15-3 KeV. The HEAO A-2 Experiment was primarily designed for studying the diffuse X-ray background; however, it was also capable of studying point sources to good sensitivity. Thus, after several months of continuous scanning to survey 95% of the diffuse X-ray sky, the A-2 detectors began individual pointings at selected targets. The point maneuvers began on day 319, 15 November 1977 and ended on day 739, 9 January 1979. This is a service provided by NASA HEASARC .
182. HEAO 1 A2 Raw Rates
ID:
ivo://nasa.heasarc/a2rtraw
Title:
HEAO 1 A2 Raw Rates
Short Name:
A2RTRAW
Date:
18 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
The A2 experiment was flown on the HEAO-1 satellite, between August, 1977 until January 1979. The experiment consisted of six multi-layer multi-anode collimated gas proportional counters. These were two LEDs (Low Energy Detectors), a MED (Medium Energy Detector), and three HEDs (High Energy Detectors). The first 6-months of mission were dedicated to an all-sky scan after which a pointing phase started. This database accesses the raw rate data obtained from the A2 MED (small and large field of view, FOV) and HEDs (1,2 and 3 small and large filed of view) detectors during the scanning and pointed phase. Note: This database does not contain coordinates. Since the satellite was mostly scanning, the XRATE database, from which the FITS files are generated, was organized in time. This is a service provided by NASA HEASARC .
183. HEAO 1 A2 Scanned Lightcurves
ID:
ivo://nasa.heasarc/a2lcscan
Title:
HEAO 1 A2 Scanned Lightcurves
Short Name:
A2LCSCAN
Date:
18 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
The A2 experiment was flown on the HEAO-1 satellite, from August, 1977 until January 1979. The experiment consisted of six multi-layer, multi-anode collimated gas proportional counters. These were two LEDs (Low Energy Detectors), a MED (Medium Energy Detector), and three HEDs (High Energy Detectors). The first 6-months of mission were dedicated to an all-sky scan after which a pointing phase started. This database table accesses the lightcurves available at HEASARC obtained from the A2 MED (small and large field of view) and HEDs (3 units, each with small and large field of view) detectors during the scanning phase. This is a service provided by NASA HEASARC .
184. HEAO 1 A4 Spectra
ID:
ivo://nasa.heasarc/a4spectra
Title:
HEAO 1 A4 Spectra
Short Name:
A4SPECTRA
Date:
18 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
The UCSD/MIT Hard X-Ray and Low-Energy Gamma-Ray Instrument, A4, was flown on the HEAO 1 satellite, between August 1977 until January 1979. The experiment consisted of a collection of collimated sodium iodide scintillators, two of which the Low Energy detectors (LED, LED-3 and LED-6), were optimized for the lower energy part of the hard X-ray range between 13 to 180 keV. The first 6-months of mission were dedicated to an all-sky scan after which a pointing phase started. In pointing mode the A4-LED instrument look axis was kept in a 1 deg dead band centered on the target position. Instead in the "ping-pong" mode the look axis was regularly alternated with a secondary target a few degrees away, usually for background determination. This database table accesses the spectra (and associated files) obtained from the A4-LED detectors in the ping-pong mode. This is a service provided by NASA HEASARC .
185. HEAO 1 A2 Spectra
ID:
ivo://nasa.heasarc/a2spectra
Title:
HEAO 1 A2 Spectra
Short Name:
A2SPECTRA
Date:
18 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
The A2 experiment was flown on the HEAO-1 satellite, between August, 1977 until January 1979. The experiment consisted of six multi-layer multi-anode collimated gas proportional counters. These were two LEDs (Low Energy Detectors), a MED (Medium Energy Detector), and three HEDs (High Energy Detectors). The first 6-months of mission were dedicated to an all-sky scan after which a pointing phase started. This database accesses the spectra (and associated files) obtained from the A2 MED (small and large field of view) and HEDs (1 and 3 small and large filed of view) detectors during the pointed phase. The spectra were generated for all HEAO-1 A2 pointed observations except for those in more unusual HEAO-1 modes (RAM-11 and "radical RAMs"). Thus the set of spectra created are only a subset (though a fairly complete one) of the entire catalog of HEAO-1 A2 pointed observations. This is a service provided by NASA HEASARC .
186. HEAO 1 A2 Spectra Background
ID:
ivo://nasa.heasarc/a2specback
Title:
HEAO 1 A2 Spectra Background
Short Name:
A2SPECBACK
Date:
18 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
The A2 experiment was flown on the HEAO-1 satellite, between August, 1977 until January 1979. The experiment consisted of six multi-layer multi-anode collimated gas proportional counters. These were two LEDs (Low Energy Detectors), a MED (Medium Energy Detector), and three HEDs (High Energy Detectors). The first 6-months of mission were dedicated to an all-sky scan after which a pointing phase started. This database table accesses all the background files available at HEASARC obtained from the A2 MED (small and large field of view) and HEDs (1 and 3 small and large filed of view) detectors during the pointed phase. This is a service provided by NASA HEASARC .
187. Herschel Astrophysical Terahertz Large Area Survey
ID:
ivo://irsa.ipac/Herschel/Images/H-ATLAS
Title:
Herschel Astrophysical Terahertz Large Area Survey
Short Name:
H-ATLAS
Date:
27 Oct 2022 19:00:00
Publisher:
NASA/IPAC Infrared Science Archive
Description:
The Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) is a survey of 600 deg^2 in five photometric bands - 100, 160, 250, 350 and 500 microns - with the Photoconductor Array Camera and Spectrometer (PACS) and Spectral and Photometric Imaging Receiver (SPIRE) cameras. H-ATLAS DR1 includes the survey of three fields on the celestial equator, covering a total area of 161.6 deg^2 and previously observed in the Galaxy and Mass Assembly (GAMA) spectroscopic survey.
188. Herschel Gould Belt Survey
ID:
ivo://irsa.ipac/Herschel/Images/HGBS
Title:
Herschel Gould Belt Survey
Short Name:
HGBS
Date:
27 Oct 2022 19:00:00
Publisher:
NASA/IPAC Infrared Science Archive
Description:
The Herschel Gould Belt Survey is one of the largest Herschel Key Projects. It conducted extensive far-infrared and submillimeter mapping of nearby molecular clouds with both the SPIRE and PACS instruments. It covered the bulk of the nearest (d <= 0.5 kpc) cloud complexes in the Galaxy, which are mostly located in the Gould Belt, a giant (700 pc by 1000 pc), flat structure inclined by 20d to the Galactic plane.
189. Herschel High Level Images
ID:
ivo://irsa.ipac/Herschel/Images/HHLI
Title:
Herschel High Level Images
Short Name:
HHLI
Date:
27 Oct 2022 19:00:00
Publisher:
NASA/IPAC Infrared Science Archive
Description:
The Herschel High Level Images (HHLI) are a subset of the data in the Herschel Science Archive (HSA), the entire contents of which are accessible at IRSA through the Herschel Data Search tool. The HHLI represent PACS and SPIRE image products that have been processed to the highest level available through the Standard Product Generation (SPG) pipeline, version 14.0. They are provided here as a convenient way for users to quickly visualize PACS and SPIRE imaging for any given region on the sky observed by these two instruments.
190. Herschel Local Group
ID:
ivo://irsa.ipac/Herschel/Images/LocalGroup
Title:
Herschel Local Group
Short Name:
LocalGroup
Date:
07 Apr 2023 00:00:01
Publisher:
NASA/IPAC Infrared Science Archive
Description:
Because the galaxies of the Local Group have such large angular sizes, much of their diffuse, large-angular-scale emission is filtered out by the Herschel data reduction process. This work restores this previously missed dust in Herschel observations of the Large Magellanic Cloud, Small Magellanic Cloud, M31, and M33 by combining Herschel data (including new reductions for the Magellanic Clouds), in Fourier space, with lower-resolution data from all-sky surveys (Planck, IRAS, and COBE) that did not miss the extended emission.

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