2021ApJ...920L..44C

Query : 2021ApJ...920L..44C

2021ApJ...920L..44C - Astrophys. J., 920, L44-L44 (2021/October-3)

Eridanus IV: an ultra-faint dwarf galaxy candidate discovered in the DECam Local Volume Exploration survey.

CERNY W., PACE A.B., DRLICA-WAGNER A., KOPOSOV S.E., VIVAS A.K., MAU S., RILEY A.H., BOM C.R., CARLIN J.L., CHOI Y., ERKAL D., FERGUSON P.S., JAMES D.J., LI T.S., MARTINEZ-DELGADO D., MARTINEZ-VAZQUEZ C.E., MUNOZ R.R., MUTLU-PAKDIL B., OLSEN K.A.G., PIERES A., SAKOWSKA J.D., SAND D.J., SIMON J.D., SMERCINA A., STRINGFELLOW G.S., TOLLERUD E.J., ADAMOW M., HERNANDEZ-LANG D., KUROPATKIN N., SANTANA-SILVA L., TUCKER D.L., ZENTENO A. (The DELVE Collaboration)

Abstract (from CDS):

We present the discovery of a candidate ultra-faint Milky-Way satellite, Eridanus IV (DELVE J0505-0931), detected in photometric data from the DECam Local Volume Exploration survey (DELVE). Eridanus IV is a faint (MV = - 4.7 ± 0.2), extended (r1/2=75–13+16pc), and elliptical (ε = 0.54 ± 0.1) system at a heliocentric distance of 76.7–6.1+4.0kpc, with a stellar population that is well described by an old, metal-poor isochrone (age of τ ∼ 13.0 Gyr and metallicity of [Fe/H] <= - 2.1 dex). These properties are consistent with the known population of ultra-faint Milky-Way satellite galaxies. Eridanus IV is also prominently detected using proper-motion measurements from Gaia Early Data Release 3, with a systemic proper motion of (µαcosδ,µδ)=(+0.25±0.06,-0.10±0.05) mas yr–1 measured from its horizontal branch and red-giant-branch member stars. We find that the spatial distribution of likely member stars hints at the possibility that the system is undergoing tidal disruption.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Dwarf galaxies - Horizontal branch stars

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

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Magellanic Stream HVC 00 32 -30.0           ~ 977 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11210 1
3 NAME Sagittarius Stream St* 02 22 +00.0           ~ 881 0
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7114 0
5 Gaia DR3 3182724869762754048 RR? 05 05 44.6167725603 -09 29 40.471850456           ~ 1 0
6 NAME Eridanus IV G 05 05 45 -09 30.9           ~ 7 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17525 0
8 NAME Leo V G 11 31 09.60 +02 13 12.0     16.0     ~ 205 0
9 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 265 2
10 NAME Serpens Dwarf GlC 15 16 05.30 -00 06 41.0   15.1       ~ 741 1
11 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14518 0
12 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2206 2
13 NAME Tuc III G 23 56.6 -59 36           ~ 191 0
14 NAME Local Group GrG ~ ~           ~ 8445 0

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