Table · dataset · 1997
Bell Lab. H I Survey - High Velocity Clouds
Listed in IVOA Registry (Virtual Observatory)
The sky north of declination -40 deg. was observed in the 21 cm line of atomic hydrogen with the FWHM = 2 deg. beam of the 20 foot horn reflector at AT&T Bell Laboratories, Crawford Hill.
Description
The survey covers a velocity range of 654 km/s centered on the Galactic standard of rest, with 5.3 km/s wide filters. This survey is distinguished by its sensitivity to low surface brightness features (antenna temperature about 50 mK) and relative freedom from sidelobe contamination.
The high-velocity cloud list was extracted and catalogued automatically from the survey data. Introduction: Observations were made as drift scans along even declinations between -40 deg. and +90 deg. at the epoch (1981) of the observations. The horn antenna has a FWHM beam size of 2 deg. at 21 cm.
Read the rest (1 more)
The average rms noise of spectra taken at all declinations is 0.017 K in 5.2 km/s wide channels, although in some cases baseline problems make the survey unreliable at this level. The clouds catalogued were selected to be those near for which the velocities, when projected on the galactic plane at each possible distance, differed from the circular rotation velocities by more than 40 km/s. The boundaries of the clouds were determined by either a decrease in emission to near the baseline emission or a steep drop in antenna temperature.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/79/77 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 1992ApJS...79...77S ui.adsabs.harvard.edu/abs/1992ApJS...79...77S ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/apjs/79/77 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Radio
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apjs/79/77 | 14 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:radio | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |