2024ApJ...961..126M

Query : 2024ApJ...961..126M

2024ApJ...961..126M - Astrophys. J., 961, 126 (2024/January-3)

A Search for Faint Resolved Galaxies Beyond the Milky Way in DES Year 6: A New Faint, Diffuse Dwarf Satellite of NGC 55.

McNANNA M., BECHTOL K., MAU S., NADLER E.O., MEDOFF J., DRLICA-WAGNER A., CERNY W., CRNOJEVIC D., MUTLU-PAKDIL B., VIVAS A.K., PACE A.B., CARLIN J.L., COLLINS M.L.M., FERGUSON P.S., MARTINEZ-DELGADO D., MARTINEZ-VAZQUEZ C.E., NOEL N.E.D., RILEY A.H., SAND D.J., SMERCINA A., TOLLERUD E., WECHSLER R.H., ABBOTT T.M.C., AGUENA M., ALVES O., BACON D., BOM C.R., BROOKS D., BURKE D.L., CARBALLO-BELLO J.A., CARNERO ROSELL A., CARRETERO J., DA COSTA L.N., DAVIS T.M., DE VICENTE J., DIEHL H.T., DOEL P., FERRERO I., FRIEMAN J., GIANNINI G., GRUEN D., GUTIERREZ G., GRUENDL R.A., HINTON S.R., HOLLOWOOD D.L., HONSCHEID K., JAMES D.J., KUEHN K., MARSHALL J.L., MENA-FERNANDEZ J., MIQUEL R., PEREIRA M.E.S., PIERES A., PLAZAS MALAGON A.A., SAKOWSKA J.D., SANCHEZ E., SANCHEZ CID D., SANTIAGO B., SEVILLA-NOARBE I., SMITH M., STRINGFELLOW G.S., SUCHYTA E., SWANSON M.E.C., TARLE G., WEAVERDYCK N., WISEMAN P. (The DES & DELVE Collaboration)

Abstract (from CDS):

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 MV ∼ (-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 ${2.2}_{-0.12}^{+0.05}\,\mathrm{Mpc}$, 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 $-{8.0}_{-0.3}^{+0.5}\,\mathrm{mag}$ and an azimuthally averaged physical half-light radius of ${2.2}_{-0.4}^{+0.5}\,\mathrm{kpc}$, making this one of the lowest surface brightness galaxies ever found with $\mu =32.3\,\mathrm{mag}\,{\mathrm{arcsec}}^{-2}$. This is the largest, most diffuse galaxy known at this luminosity, suggesting possible tidal interactions with its host.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Local Group - Low surface brightness galaxies - Dwarf galaxies

Status at CDS : Examining the need for a new acronym.

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 55 rG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 828 2
2 NAME NGC 55-dw1 LSB 00 15 30 -38 25.1           ~ 6 0
3 ESO 410-5 LSB 00 15 31.21 -32 10 49.9   15.32 14.9 14.58   ~ 120 1
4 And XIX G 00 19 32.10 +35 02 37.1     15.6     ~ 168 0
5 ESO 294-10 AG? 00 26 33.37 -41 51 19.1   15.76 15.3 14.97   ~ 122 2
6 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
7 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
8 NAME NGC 253-dw2 G 00 50 17.060 -24 44 58.58           ~ 21 0
9 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
10 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
11 NAME Andromeda XXIII G 01 29 21.8 +38 43 08     14.2     ~ 88 0
12 NAME Phoenix Stream St* 01 35.0 -49 53           ~ 52 0
13 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
14 NAME Eridanus II G 03 44 21.1 -43 32 00           ~ 216 0
15 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
16 NAME Antlia II Dwarf Galaxy G 09 35 32.8 -36 46 02           ~ 109 0
17 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 176 0
18 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 324 0
19 NAME Tucana B LSB 22 47 00.50 -58 24 27.0           ~ 22 0
20 NAME Andromeda XXI G 23 54 47.7 +42 28 15     14.8     ~ 117 0
21 NAME Local Group GrG ~ ~           ~ 9325 0
22 NAME ATLAS Stream St* ~ ~           ~ 44 0

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