HAlpha: Resource Record Summary

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Resource Record Summary

Image Service:
H-alpha Full Sky Map

Short name: HAlpha IVOA Identifier: ivo://nasa.heasarc/skyview/halphaPublisher: NASA/GSFC HEASARCivo://nasa.heasarc/ASD[Pub. ID] More Info: https://skyview.gsfc.nasa.gov VO Compliance: Level 2: This is a VO-compliant resource.	Status: active Registered: 2024 May 17 00:00:00Z
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Description

The full-sky H-alpha map (6' FWHM resolution) is a composite of the Virginia Tech Spectral line Survey (VTSS) in the north and the Southern H-Alpha Sky Survey Atlas (SHASSA) in the south. Stellar artifacts and bleed trails have been carefully removed from these maps. The Wisconsin H-Alpha Mapper (WHAM) survey provides a stable zero-point over 3/4 of the sky on a one degree scale. This composite map can be used to provide limits on thermal bremsstrahlung (free-free emission) from ionized gas known to contaminate microwave-background data. The map (in Rayleighs; 1R=10<sup>6</sup>/4pi photons/cm<sup>2</sup>/s/sr), an error map, and a bitmask are provided in 8640x4320 Cartesian projections as well as HEALPIX (Nside 256, 512, and 1024) projections on the <a href="https://faun.rc.fas.harvard.edu/dfink/skymaps/halpha/"> H-Alpha Full-Sky Map website</a>. Provenance: . This is a service of 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: Contributor: Skyview Project

Contact Information:

X SkyView Help
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:

Created: 2024 May 17

This resource was registered on: 2024 May 17 00:00:00Z
This resource description was last updated on: 2024 May 17 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 data (specifically, images). With this type of service, you can search for data by issuing a query, and information about available data is returned as a table.

Resource type keywords: Archive	Subject keywords: surveys
Intended audience or use: Research: This resource provides information appropriate for supporting scientific research.
More Info: https://skyview.gsfc.nasa.gov
Related Resources: This is a service for accessing data from: NASA/GSFC Exploration of the Universe Division ivo://nasa.heasarc/eud [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: Wavebands covered: Optical

Available Service Interfaces

Simple Image AccessXX

This is a standard IVOA service used to search for images from this resource that overlap with a specified region of the sky.

VO Compliance: Level 2: This is a VO-compliant resource.
Available endpoints for the standard interface:

https://skyview.gsfc.nasa.gov/cgi-bin/vo/sia.pl?survey=halpha&

Image service type: Cutout: images will be cut out to match the requested region.
Maximum query region accepted: no size limit
Maximum region size returned: no size limit
Maximum image size returned: X pixels
Maximum image size returned: 10 MB
Maximum number of matching records returned: 500

	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://skyview.gsfc.nasa.gov/cgi-bin/query.pl

Developed with the support of the National Science Foundation
under Cooperative Agreement AST0122449 with the Johns Hopkins University
The NAVO project is a member of the International Virtual Observatory Alliance

This NAVO Application is hosted by the Space Telescope Science Institute

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