Table · dataset · 2022
FUSE survey of H_2_ in the Galactic disk
Listed in IVOA Registry (Virtual Observatory)
We report results from a Far Ultraviolet Spectrographic Explorer (FUSE) survey of interstellar molecular hydrogen (H_2_) in the Galactic disk toward 139 O-type and early B-type stars at Galactic latitudes |b|<=10{deg}, with updated photometric and parallax distances.
Description
H_2_ absorption is measured using the far-UV Lyman and Werner bands, including strong R(0), R(1), and P(1) lines from rotational levels J=0 and J=1 and excited states up to J=5 (sometimes J=6 and 7).
For each sight line, we report column densities N_H2_, N_HI_, N(J), and N_H_=N_HI_+2N_H2_ and the molecular fraction f_H2_=2N_H2_/N_H_. Our survey extends the 1977 Copernicus H_2_ survey up to N_H_~5x10^21^cm^-2^. The lowest rotational states have excitation temperatures and rms dispersions <T_01_>=88+/-20K and <T_02_>=77+/-18K, suggesting that J=0, 1, 2 are coupled to the gas kinetic temperature.
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Populations of higher-J states exhibit mean excitation temperatures <T_24_>=237+/-91K and <T_35_>=304+/-108K, produced primarily by UV radiative pumping. Correlations of f_H2_ with E(B-V) and N_H_ show a transition to f_H2_>=0.1 at N_H_>~10^21^cm^-2^ and E(B-V)>~0.2, interpreted with an analytic model of H_2_ formation-dissociation equilibrium and attenuation of the far-UV radiation field by self-shielding and dust opacity.
Results of this disk survey are compared to previous FUSE studies of H_2_ in translucent clouds, at high Galactic latitudes, and in the Magellanic Clouds. Using updated distances to the target stars, we find average sight-line values <f_H2_>=0.20 and <N_H_/E(B-V)>=6.07x10^21^cm^-2^/mag.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/911/55 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2021ApJ...911...55S ui.adsabs.harvard.edu/abs/2021ApJ...911...55S ↗
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/apj/911/55 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apj/911/55 | 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 | |
| concepts[modality].ivoa_waveband:uv | 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 |