Table · dataset · 2011
HI composite survey survey collection
Listed in IVOA Registry (Virtual Observatory)
Composite all-sky map of neutral hydrogen column density (N_HI), formed from the Leiden/Dwingeloo HI survey data (Hartmann & Burton 1997) and the composite N_HI map of Dickey and Lockman (1990).
Description
The two datasets are not matched in sensitivity or resolution: note that discontinuities exist in the constructed composite map. A pixel mask is provided to indicate which dataset was used for each location on the sky.
Hartmann & Burton provide a velocity integrated (-450 km/s %3C V_lsr %3C +400 km/s) HI brightness temperature map in Galactic coordinates, sampled every 0.5 degrees. This entire data set was converted to N_HI by multiplying by their factor of 1.8224e18 K km s-1 cm-2 and then interpolated to pixel centers appropriate for HEALPix Nside=512. Since the Leiden/Dwingeloo survey does not have sky coverage for declinations %3C -30 deg., the lower resolution Dickey & Lockman map was also interpolated to HEALPix and used to fill in the coverage gap.
Read the rest (4 more)
The Dickey & Lockman N_HI map is itself a composite of several surveys which had been merged and averaged onto 1 deg. bins in Galactic coordinates. Their map includes emission between -250 km/s %3C V_lsr %3C 250 km/s (excluding the LMC and SMC). The Leiden/Dwingeloo Survey data were obtained from the CDS.
The Dickey & Lockman map was obtained from NCSA ADIL. This original HEALPix file is distributed and maintained by LAMBDA.Original acknowledgement for data: We acknowledge the use of the Legacy Archive for Microwave
Background
Data Analysis (LAMBDA), part of the High Energy Astrophysics Science Archive Center (HEASARC). HEASARC/LAMBDA is a service of the Astrophysics Science Division at the NASA Goddard Space Flight Center.
Links
Where it is published
- Reference page alasky.cds.unistra.fr/HI ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 1990ARA&A..28..215D ui.adsabs.harvard.edu/abs/1990ARA%26A..28..215D ↗
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/p/hi ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Radio
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 69%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds/p/hi | 14 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].anzsrc:group:5101 | enrichment · IVOA Registry | taxonomy-embedding@1.1.0 | title+keywords+description (69%) |
| 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 | 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 |