UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Milky Way Satellite Census. I. The Observational Selection Function for Milky Way Satellites in DES Y3 and Pan-STARRS DR1

Drlica-Wagner, A; Bechtol, K; Mau, S; McNanna, M; Nadler, EO; Pace, AB; Li, TS; ... Tarle, G; + view all (2020) Milky Way Satellite Census. I. The Observational Selection Function for Milky Way Satellites in DES Y3 and Pan-STARRS DR1. The Astrophysical Journal , 893 (1) , Article 47. 10.3847/1538-4357/ab7eb9. Green open access

[thumbnail of Drlica-Wagner_2020_ApJ_893_47.pdf]
Preview
Text
Drlica-Wagner_2020_ApJ_893_47.pdf - Published version

Download (2MB) | Preview

Abstract

We report the results of a systematic search for ultra-faint Milky Way satellite galaxies using data from the Dark Energy Survey (DES) and Pan-STARRS1 (PS1). Together, DES and PS1 provide multi-band photometry in optical/near-infrared wavelengths over ~80% of the sky. Our search for satellite galaxies targets ~25,000 deg2 of the high-Galactic-latitude sky reaching a 10σ point-source depth of gsim22.5 mag in the g and r bands. While satellite galaxy searches have been performed independently on DES and PS1 before, this is the first time that a self-consistent search is performed across both data sets. We do not detect any new high-significance satellite galaxy candidates, recovering the majority of satellites previously detected in surveys of comparable depth. We characterize the sensitivity of our search using a large set of simulated satellites injected into the survey data. We use these simulations to derive both analytic and machine-learning models that accurately predict the detectability of Milky Way satellites as a function of their distance, size, luminosity, and location on the sky. To demonstrate the utility of this observational selection function, we calculate the luminosity function of Milky Way satellite galaxies, assuming that the known population of satellite galaxies is representative of the underlying distribution. We provide access to our observational selection function to facilitate comparisons with cosmological models of galaxy formation and evolution.

Type: Article
Title: Milky Way Satellite Census. I. The Observational Selection Function for Milky Way Satellites in DES Y3 and Pan-STARRS DR1
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/1538-4357/ab7eb9
Publisher version: https://doi.org/10.3847/1538-4357/ab7eb9
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Dwarf spheroidal galaxies; Local Group; Dark matter; Milky Way Galaxy
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10098402
Downloads since deposit
0Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item