Table · dataset · 2023
The Ly{alpha} Reference Sample (LARS). XIV.
Listed in IVOA Registry (Virtual Observatory)
We present Ly{alpha} imaging of 45 low-redshift star-forming galaxies observed with the Hubble Space Telescope.
Description
The galaxies have been selected to have moderate to high star formation rates (SFRs) using far-ultraviolet (FUV) luminosity and H{alpha} equivalent width criteria, but no constraints on Ly{alpha} luminosity. We employ a pixel stellar continuum fitting code to obtain accurate continuum-subtracted Ly{alpha}, H{alpha}, and H{beta} maps.
We find that Ly{alpha} is less concentrated than FUV and optical line emission in almost all galaxies with significant Ly{alpha} emission. We present global measurements of Ly{alpha} and other quantities measured in apertures designed to capture all of the Ly{alpha} emission. We then show how the escape fraction of Ly{alpha} relates to a number of other measured quantities (mass, metallicity, star formation, ionization parameter, and extinction).
Read the rest (2 more)
We find that the escape fraction is strongly anticorrelated with nebular and stellar extinction, weakly anticorrelated with stellar mass, but no conclusive evidence for correlations with other quantities. We show that Ly{alpha} escape fractions are inconsistent with common dust extinction laws, and discuss how a combination of radiative transfer effects and clumpy dust models can help resolve the discrepancies. We present an SFR calibration based on Ly{alpha} luminosity, where the equivalent width of Ly{alpha} is used to correct for nonunity escape fraction, and show that this relation provides a reasonably accurate SFR estimate.
We also show stacked growth curves of Ly{alpha} for the galaxies that can be used to find aperture loss fractions at a given physical radius.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/266/15 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2023ApJS..266...15M ui.adsabs.harvard.edu/abs/2023ApJS..266...15M ↗
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/266/15 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Imaging 75%
Provenance · 1 source records, 10 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apjs/266/15 | 13 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:optical | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:uv | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].local:modality:imaging | enrichment · IVOA Registry | keyword-concept-rules@1.0.0 | title+description (75%) |
| 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 |