Table · dataset · 2021
Luminous Ly{alpha} emitters at z~2-3
Listed in IVOA Registry (Virtual Observatory)
Deep narrow-band surveys have revealed a large population of faint Ly{alpha} emitters (LAEs) in the distant Universe, but relatively little is known about the most luminous sources (L_Lya_>~10^42.7^erg/s; L_Lya>~L^*^_Lya_).
Description
Here we present the spectroscopic follow-up of 21 luminous LAEs at z~2-3 found with panoramic narrow-band surveys over five independent extragalactic fields (=~4x10^6^Mpc^3^ surveyed at z~2.2 and z~3.1).
We use WHT/ISIS, Keck/DEIMOS, and VLT/X-SHOOTER to study these sources using high ionization UV lines. Luminous LAEs at z~2-3 have blue UV slopes ({beta}=-2.0^+0.3^_-0.1_) and high Ly{alpha} escape fractions (50^+20^_-15_ per cent) and span five orders of magnitude in UV luminosity (M_UV_=~-19 to -24). Many (70 per cent) show at least one high ionization rest-frame UV line such as CIV, NV, CIII], HeII or OIII], typically blue-shifted by =~100-200km/s relative to Ly{alpha}.
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Their Ly{alpha} profiles reveal a wide variety of shapes, including significant blue-shifted components and widths from 200 to 4000km/s. Overall, 60+/-11 per cent appear to be active galactic nucleus (AGN) dominated, and at L_Lya_>10^43.3^erg/s and/or M_UV_<-21.5 virtually all LAEs are AGNs with high ionization parameters (logU=0.6+/-0.5) and with metallicities of =~0.5-1Z_{sun}_. Those lacking signatures of AGNs (40+/-11 per cent) have lower ionization parameters (logU=-3.0^+1.6^_-0.9_ and log{xi}_ion_=25.4+/-0.2) and are apparently metal-poor sources likely powered by young, dust-poor 'maximal' starbursts.
Our results show that luminous LAEs at z~2-3 are a diverse population and that 2xL^*^_Lya_ and 2*M_UV_^*^ mark a sharp transition in the nature of LAEs, from star formation dominated to AGN dominated.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/477/2817 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2018MNRAS.477.2817S ui.adsabs.harvard.edu/abs/2018MNRAS.477.2817S ↗
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/477/2817 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Uv
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/mnras/477/2817 | 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: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 |