Hat Creek High-Latitude H I Survey Virtual Observatory Resource

Authors
  1. Heiles C. and Habing H.J.
  2. Published by
    CDS
Abstract

This survey consists of H I 21-cm spectra covering the entire northern sky with absolute Galactic latitude |b|>10 degrees and declination dec>-30degrees. The observations were made with the Hat Creek 85-foot telescope between 1968 and 1970. The individual spectra were obtained with a bank of 100 filters covering the velocity range from -92km/s to +75km/s. The velocity resolution was 2 km/sec (except at the ends of the spectra) and the beamwidth was 36arcmin. The spacing between points observed on the sky is (0.3deg/cosb) in Galactic longitude and (0.6deg) in Galactic latitude. A FITS version of the survey was derived at the Astrophysics Data Facility (NASA/GSFC) from the original catalog of spectra. The approximately 130,000 good spectra in the catalog (i.e., those with status code 1 and which have flat baselines) were interpolated to a uniform channel width in frequency, shifted as appropriate to take into account the proper central velocities, then interpolated onto a regular grid in Galactic coordinates. For the latter interpolation, the cos(b) corrections for longitude offsets were taken into account; no interpolation was done across gaps in coverage greater than 2 deg. Latitude-velocity slices were written in FITS format for each 30 arcmin of longitude. Separate files were written for the negative latitude (b < -10 deg ) and positive latitude (b > 10 deg) ranges. Slices containing no spectra, primarily negative latitude spectra in the fourth Galactic quadrant, were not written. A longitude-latitude map, integrated over all velocities, was also written in FITS format to illustrate the coverage of the individual latitude-velocity slices.

Keywords
  1. Radio sources
  2. Surveys
  3. H I line emission
Bibliographic source Bibcode
1974A&AS...14....1H
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/VIII/7A
IVOA Identifier IVOID
ivo://CDS.VizieR/VIII/7A
Document Object Identifer DOI

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=VIII/7A
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=VIII/7A
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=VIII/7A
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/VIII/7A/catalog?
https://vizier.iucaa.in/viz-bin/conesearch/VIII/7A/catalog?
http://vizieridia.saao.ac.za/viz-bin/conesearch/VIII/7A/catalog?

History

2003-11-29T19:24:20Z
Resource record created
2003-11-29T19:24:20Z
Created
2018-01-30T07:18:24Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr