| Title: |
A Search for Faint Resolved Galaxies Beyond the Milky Way in DES Year 6: A New Faint, Diffuse Dwarf Satellite of NGC 55 |
| Authors: |
McNanna, M; Bechtol, K; Mau, S; Nadler, EO; Medoff, J; Drlica-Wagner, A; Cerny, W; Crnojevic, D; Mutlu-Pakdil, B; Vivas, AK; Pace, AB; Carlin, JL; Collins, MLM; Ferguson, PS; Martinez-Delgado, D; Martinez-Vazquez, CE; Noel, NED; Riley, AH; Sand, DJ; Smercina, A; Tollerud, E; Wechsler, RH; Abbott, TMC; Aguena, M; Alves, O; Bacon, D; Bom, CR; Brooks, D; Burke, DL; Carballo-Bello, JA; Carnero Rosell, A; Carretero, J; da Costa, LN; Davis, TM; De Vicente, J; Diehl, HT; Doel, P; Ferrero, I; Frieman, J; Giannini, G; Gruen, D; Gutierrez, G; Gruendl, RA; Hinton, SR; Hollowood, DL; Honscheid, K; James, DJ; Kuehn, K; Marshall, JL; Mena-Fernandez, J; Miquel, R; Pereira, MES; Pieres, A; Malagon, AA Plazas; Sakowska, JD; Sanchez, E; Sanchez Cid, D; Santiago, B; Sevilla-Noarbe, I; Smith, M; Stringfellow, GS; Suchyta, E; Swanson, MEC; Tarle, G; Weaverdyck, N; Wiseman, P |
| Source: |
Astrophysical Journal , 961 (1) , Article 126. (2024) |
| Publisher Information: |
IOP Publishing Ltd |
| Publication Year: |
2024 |
| Collection: |
University College London: UCL Discovery |
| Subject Terms: |
Science & Technology; Physical Sciences; Astronomy & Astrophysics; SPACE-TELESCOPE OBSERVATIONS; LOCAL VOLUME; DARK-MATTER; DATA RELEASE; LUMINOSITY FUNCTION; TOO BIG; MAGELLANIC CLOUDS; GLOBULAR-CLUSTER; STELLAR-SYSTEMS; MASS FUNCTION |
| Description: |
We report results from a systematic wide-area search for faint dwarf galaxies at heliocentric distances from 0.3 to 2 Mpc using the full 6 yr of data from the Dark Energy Survey (DES). Unlike previous searches over the DES data, this search specifically targeted a field population of faint galaxies located beyond the Milky Way virial radius. We derive our detection efficiency for faint, resolved dwarf galaxies in the Local Volume with a set of synthetic galaxies and expect our search to be complete to M V ∼ (−7, −10) mag for galaxies at D = (0.3, 2.0) Mpc. We find no new field dwarfs in the DES footprint, but we report the discovery of one high-significance candidate dwarf galaxy at a distance of 2.2 − 0.12 + 0.05 Mpc , a potential satellite of the Local Volume galaxy NGC 55, separated by 47′ (physical separation as small as 30 kpc). We estimate this dwarf galaxy to have an absolute V-band magnitude of − 8.0 − 0.3 + 0.5 mag and an azimuthally averaged physical half-light radius of 2.2 − 0.4 + 0.5 kpc , making this one of the lowest surface brightness galaxies ever found with μ = 32.3 mag arcsec − 2 . This is the largest, most diffuse galaxy known at this luminosity, suggesting possible tidal interactions with its host. |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
English |
| Relation: |
https://discovery.ucl.ac.uk/id/eprint/10189029/1/McNanna_2024_ApJ_961_126.pdf; https://discovery.ucl.ac.uk/id/eprint/10189029/ |
| Availability: |
https://discovery.ucl.ac.uk/id/eprint/10189029/1/McNanna_2024_ApJ_961_126.pdf; https://discovery.ucl.ac.uk/id/eprint/10189029/ |
| Rights: |
open |
| Accession Number: |
edsbas.9313BA63 |
| Database: |
BASE |