SIMBAD references

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 (M_V = - 4.7 ± 0.2), extended (r_1/2=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 (µ_αcosδ,µ_δ)=(+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.

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

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

Simbad objects: 14

Full paper

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