Stellar populations in LAEs and LBGs Virtual Observatory Resource

Authors
  1. Arrabal Haro P.
  2. Rodriguez Espinosa J.M.
  3. Munoz-Tunon C.
  4. Sobral D.,Lumbreras-Calle A.
  5. Boquien M.
  6. Hernan-Caballero A.
  7. Rodriguez-Munoz L.,Alcalde Pampliega B.
  8. Published by
    CDS
Abstract

Lyman alpha emitters (LAEs) and Lyman break galaxies (LBGs) represent the most common groups of star-forming galaxies at high z, and the differences between their inherent stellar populations (SPs) are a key factor in understanding early galaxy formation and evolution. We have run a set of SP burst-like models for a sample of 1558 sources at 3.4<z<6.8 from the Survey for High-z Absorption Red and Dead Sources (SHARDS) over the GOODS-N field. This work focuses on the differences between the three different observational subfamilies of our sample: LAE-LBGs, no-Ly{alpha} LBGs, and pure LAEs. Single and double SP synthetic spectra were used to model the spectral energy distributions, adopting a Bayesian information criterion to analyze under which situations a second SP is required. We find that the sources are well modelled using a single SP in ~79 per cent of the cases. The best models suggest that pure LAEs are typically young low-mass galaxies (t~26^+41^_-25_Myr; M_star_~5.6^+12.0^_-5.5_x10^8^M_{sun}_), undergoing one of their first bursts of star formation. On the other hand, no-Ly{alpha} LBGs require older SPs (t~71+/-12Myr), and they are substantially more massive (M_star_~3.5+/-1.1x10^9^M_{sun}_). LAE-LBGs appear as the subgroup that more frequently needs the addition of a second SP, representing an old and massive galaxy caught in a strong recent star-forming episode. The relative number of sources found from each subfamily at each z supports an evolutionary scenario from pure LAEs and single SP LAE-LBGs to more massive LBGs. Stellar mass functions are also derived, finding an increase of M_*_ with cosmic time and a possible steepening of the low-mass slope from z~6 to z~5 with no significant change to z~4. Additionally, we have derived the SFR-M_star_ relation, finding an SFR{prop.to}M_star_^{beta}^ behaviour with negligible evolution from z~4 to z~6.

Keywords
  1. galaxies
  2. redshifted
  3. stellar-populations
  4. stellar-ages
  5. astronomical-models
  6. visible-astronomy
  7. infrared-astronomy
Bibliographic source Bibcode
2020MNRAS.495.1807A
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/495/1807
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/495/1807
Document Object Identifer DOI
doi:10.26093/cds/vizier.74951807

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/495/1807
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/495/1807
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/495/1807
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/495/1807/table2?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/495/1807/table2?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/495/1807/table2?

History

2023-09-04T12:13:16Z
Resource record created
2023-09-04T12:13:16Z
Created
2024-08-21T20:14:28Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr