Satellites around MW analogs from SAGA II Virtual Observatory Resource

Authors
  1. Karunakaran A.
  2. Spekkens K.
  3. Oman K.A.
  4. Simpson C.M.
  5. Fattahi A.,Sand D.J.
  6. Bennet P.
  7. Crnojevic D.
  8. Frenk C.S.
  9. Gomez F.A.
  10. Grand R.J.J.,Jones M.G.
  11. Marinacci F.
  12. Mutlu-Pakdil B.
  13. Navarro J.F.
  14. Zaritsky D.
  15. Published by
    CDS
Abstract

We compare the star-forming properties of satellites around Milky Way (MW) analogs from the Stage II release of the Satellites Around Galactic Analogs Survey (SAGA-II) to those from the APOSTLE and Auriga cosmological zoom-in simulation suites. We use archival GALEX UV imaging as a star formation indicator for the SAGA-II sample and derive star formation rates (SFRs) to compare with those from APOSTLE and Auriga. We compare our detection rates from the NUV and FUV bands to the SAGA-II H{alpha} detections and find that they are broadly consistent with over 85% of observed satellites detected in all three tracers. We apply the same spatial selection criteria used around SAGA-II hosts to select satellites around the MW-like hosts in APOSTLE and Auriga. We find very good overall agreement in the derived SFRs for the star-forming satellites as well as the number of star-forming satellites per host in observed and simulated samples. However, the number and fraction of quenched satellites in the SAGA-II sample are significantly lower than those in APOSTLE and Auriga below a stellar mass of M_*_~10^8^M_{sun}_, even when the SAGA-II incompleteness and interloper corrections are included. This discrepancy is robust with respect to the resolution of the simulations and persists when alternative star formation tracers are employed. We posit that this disagreement is not readily explained by vagaries in the observed or simulated samples considered here, suggesting a genuine discrepancy that may inform the physics of satellite populations around MW analogs.

Keywords
  1. dwarf-galaxies
  2. ultraviolet-photometry
  3. star-forming-regions
Bibliographic source Bibcode
2021ApJ...916L..19K
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/916/L19
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/916/L19
Document Object Identifer DOI
doi:10.26093/cds/vizier.19169019

Access

Web browser access HTML
https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/916/L19
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/916/L19
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/916/L19
IVOA Table Access TAP
https://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/ApJ/916/L19/table1?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/916/L19/table1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/916/L19/table1?

History

2024-02-13T08:10:42Z
Resource record created
2024-02-13T08:10:42Z
Created
2024-11-06T20:23:19Z
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