Table · dataset · 2016
MC2: SFR in CIZA J2242.8+5301
Listed in IVOA Registry (Virtual Observatory)
Cluster mergers may play a fundamental role in the formation and evolution of cluster galaxies.
Description
Stroe et al. (2015MNRAS.450..646S) revealed unexpected overdensities of candidate H{alpha} emitters near the ~1-Mpc-wide shock fronts of the massive (~2x10^15^M_{sun}_) 'Sausage' merging cluster, CIZA J2242.8+5301. We used the Keck/Deep Imaging Multi-Object Spectrograph and the William Herschel Telescope/AutoFib2+WYFFOS to confirm 83 H{alpha} emitters in and around the merging cluster.
We find that cluster star-forming galaxies in the hottest X-ray gas and/or in the cluster subcores (away from the shock fronts) show high [SII]6716/[SII]6761 and high [SII] 716/H{alpha}, implying very low electron densities (<30xlower than all other star-forming galaxies outside the cluster) and/or significant contribution from supernovae, respectively. All cluster star-forming galaxies near the cluster centre show evidence of significant outflows (blueshifted Na D ~ 200-300km/s), likely driven by supernovae.
Read the rest (2 more)
Strong outflows are also found for the cluster H{alpha} active galactic nucleus (AGN). H{alpha} star-forming galaxies in the merging cluster follow the z~0 mass-metallicity relation, showing systematically higher metallicity (~0.15-0.2dex) than H{alpha} emitters outside the cluster (projected R>2.5Mpc). This suggests that the shock front may have triggered remaining metal-rich gas which galaxies were able to retain into forming stars.
Our observations show that the merger of impressively massive (~10^15^M_{sun}_) clusters can provide the conditions for significant star formation and AGN activity, but, as we witness strong feedback by star-forming galaxies and AGN (and given how massive the merging cluster is), such sources will likely quench in a few 100Myr.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/450/630 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2015MNRAS.450..630S ui.adsabs.harvard.edu/abs/2015MNRAS.450..630S ↗
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/mnras/450/630 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Imaging 75%
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/mnras/450/630 | 12 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].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 |