Table · dataset · 2023
PS1 z>5.6 QSO Survey. III. z~6 quasar LF
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We present the z~6 type-1 quasar luminosity function (QLF), based on the Pan-STARRS1 (PS1) quasar survey.
Description
The PS1 sample includes 125 quasars at z~5.7-6.2, with -28<~M_1450_<~-25. With the addition of 48 fainter quasars from the SHELLQs survey, we evaluate the z~6 QLF over -28<~M_1450_<~-22.
Adopting a double power law with an exponential evolution of the quasar density ({Phi}(z){propto}10^k(z-6)^; k=-0.7), we use a maximum likelihood method to model our data. We find a break magnitude of M^*^=-26.38_-0.60_^+0.79^mag, a faint-end slope of {alpha}=-1.70_-0.19_^+0.29^, and a steep bright-end slope of {beta}=-3.84_-1.21_^+0.63^. Based on our new QLF model, we determine the quasar comoving spatial density at z~6 to be n(M_1450_{<}-26)=1.16_-0.12_^+0.13^cGpc^-3^.
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In comparison with the literature, we find the quasar density to evolve with a constant value of k~-0.7, from z~7 to z~4. Additionally, we derive an ionizing emissivity of {epsilon}_912_(z=6)=7.23_-1.02_^+1.65^x10^22^erg/s/Hz/cMpc^3^, based on the QLF measurement. Given standard assumptions, and the recent measurement of the mean free path by Becker+ 2021MNRAS.508.1853B at z~6, we calculate an HI photoionizing rate of {Gamma}HI(z=6)~6x10^-16^s^-1^, strongly disfavoring a dominant role of quasars in hydrogen reionization.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/943/67 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2023ApJ...943...67S ui.adsabs.harvard.edu/abs/2023ApJ...943...67S ↗
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/943/67 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 72%
Provenance · 1 source records, 10 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apj/943/67 | 13 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@1.0.0 | title+keywords+description (72%) |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:infrared | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:optical | 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 |