Table · dataset · 2019
MUSE datacube of MRC 0943-242
Listed in IVOA Registry (Virtual Observatory)
We have used the Multi-Unit Spectroscopic Explorer (MUSE) to study the circumgalactic medium (CGM) of a z=2.92 radio galaxy, MRC 0943-242 by parametrising its emitting and absorbing gas.
Description
In both Ly{alpha} {lambda}1216 and HeII {lambda}1640 lines, we observe emission with velocity shifts of {Delta}v=~-1000km/s from the systemic redshift of the galaxy. These blueshifted components represent kinematically perturbed gas that is aligned with the radio axis, which we interpret as jet-driven outflows.
Three of the four known Ly absorbers are detected at the same velocity as CIV {lambda}{lambda}1548,1551 and NV {lambda}{lambda}1239,1243 absorbers, proving that the gas is metal-enriched more so than previously thought. At the velocity of a strong Ly{alpha} absorber with an HI column of N_HI_/cm^-2^=10^19.2^ and velocity shift of Delta}v=~-400km/s, we also detect SiII {lambda}1260 and SiII {lambda}1527 absorption, which suggests that the absorbing gas is ionisation bounded.
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With the added sensitivity of this MUSE observation, we are more capable of adding constraints to absorber column densities and consequently determining what powers their ionisation. To do this, we obtain photoionisation grid models in cloudy which show that AGN radiation is capable of ionising the gas and producing the observed column densities in a gas of metallicity of Z/Z_{sun}_~=0.01 with a nitrogen abundance a factor of 10 greater than that of hydrogen.
This metal-enriched absorbing gas, which is also spatially extended over a projected distance of r>~60kpc, is likely to have undergone chemical enrichment through stellar winds that have swept up metals from the interstellar-medium and deposited them in the outer regions of the galaxy's halo.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/625/A102 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2019A&A...625A.102K ui.adsabs.harvard.edu/abs/2019A%26A...625A.102K ↗
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/a%2Ba/625/a102 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Radio
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 70%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/625/a102 | 12 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 (70%) |
| 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 |