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2025ApJ...994..134D - Astrophys. J., 994, 134 (2025/November-3)

The Draco Dwarf Spheroidal Galaxy in the First Year of Dark Energy Spectroscopic Instrument Data.

DING J., ROCKOSI C., LI T.S., KOPOSOV S.E., RILEY A.H., WANG W., COOPER A.P., KIZHUPRAKKAT N., LAMBERT M., MEDINA G.E., SANDFORD N., AGUILAR J., AHLEN S., BIANCHI D., BROOKS D., CLAYBAUGH T., DE LA MACORRA A., DOEL P., FORERO-ROMERO J.E., GAZTANAGA E., GONTCHO A GONTCHO S., GUTIERREZ G., GUY J., ISHAK M., KEHOE R., KISNER T., KREMIN A., LAHAV O., LANDRIAU M., LE GUILLOU L., MEISNER A., MIQUEL R., MOUSTAKAS J., PRADA F., PEREZ-RAFOLS I., ROSSI G., SANCHEZ E., SCHUBNELL M., SILBER J., SPRAYBERRY D., TARLE G., WEAVER B.A. and ZHOU R.

Abstract (from CDS):

We investigate the spatial distribution, kinematics, and metallicity of stars in the Draco dwarf spheroidal galaxy using data from the Dark Energy Spectroscopic Instrument (DESI). We identify 155 high-probability members of Draco using line-of-sight velocity and metallicity information derived from DESI spectroscopy along with Gaia Data Release 3 proper motions. We find a mean line-of-sight velocity of -290.62 ± 0.80 km s–1 with dispersion = $9.5{7}_{-0.62}^{+0.66}$ km s–1 and mean metallicity [Fe/H] = -2.10 ± 0.04, consistent with previous results. We also find that Draco has a steep metallicity gradient within the half-light radius, and a metallicity gradient that flattens beyond the half-light radius. We identify eight high-probability members outside the King tidal radius, four of which we identify for the first time. These extratidal stars are not preferentially aligned along the orbit of Draco. We compute an average surface brightness of 34.02 mag ${{\rm{arcsec}}}^{-2}$ within an elliptical annulus from the King tidal radius of 48$\mathop{.}\limits^{^{\prime} }$1-81'.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Draco dwarf galaxy - Dwarf galaxies - Galaxy evolution - Local Group

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 20

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