Table · dataset · 2018
LAE candidates around bright Ly{alpha} blobs
Listed in IVOA Registry (Virtual Observatory)
Bright Ly{alpha} blobs (LABs)-extended nebulae with sizes of ~100kpc and Ly{alpha} luminosities of ~10^44^erg/s -- often reside in overdensities of compact Ly{alpha} emitters (LAEs) that may be galaxy protoclusters.
Description
The number density, variance, and internal kinematics of LABs suggest that they themselves trace group-like halos. Here, we test this hierarchical picture, presenting deep, wide-field Ly{alpha} narrowband imaging of a 1{deg}x0.5{deg} region around a LAB pair at z=2.3 discovered previously by a blind survey.
We find 183 Ly{alpha} emitters, including the original LAB pair and three new LABs with Ly{alpha} luminosities of (0.9-1.3)x10^43^erg/s and isophotal areas of 16-24arcsec^2^. Using the LAEs as tracers and a new kernel density estimation method, we discover a large-scale overdensity (Bootes J1430+3522) with a surface density contrast of {delta}_{Sigma}_=2.7, a volume density contrast of {delta}~10.4, and a projected diameter of ~20 comoving Mpc.
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Comparing with cosmological simulations, we conclude that this LAE overdensity will evolve into a present-day Coma-like cluster with log(M/M_{sun}_)~15.1+/-0.2. In this and three other wide-field LAE surveys re-analyzed here, the extents and peak amplitudes of the largest LAE overdensities are similar, not increasing with survey size, and implying that they were indeed the largest structures then and today evolve into rich clusters.
Intriguingly, LABs favor the outskirts of the densest LAE concentrations, i.e., intermediate LAE overdensities of {delta}_{Sigma}_=1-2. We speculate that these LABs mark infalling protogroups being accreted by the more massive protocluster.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/845/172 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2017ApJ...845..172B ui.adsabs.harvard.edu/abs/2017ApJ...845..172B ↗
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/845/172 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 69% · Imaging 75%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apj/845/172 | 15 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].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 |