2025ApJ...994..134D

Query : 2025ApJ...994..134D

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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Number of rows : 20
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
3 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
5 Gaia DR3 1433888300787161728 * 17 14 35.7847394795 +58 07 02.978602196           ~ 1 0
6 SDSS J171510.27+571619.1 * 17 15 10.2783350376 +57 16 19.085723868           ~ 2 0
7 SDSS J171634.11+582955.8 * 17 16 34.1110751136 +58 29 55.772163600           ~ 2 0
8 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
9 SDSS J171806.40+583049.5 * 17 18 06.3933065736 +58 30 49.465225440           ~ 2 0
10 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
11 Gaia DR3 1420748587079854720 * 17 21 41.7957934154 +56 03 37.615743789           ~ 1 0
12 SDSS J172228.26+584350.4 * 17 22 28.2660329616 +58 43 50.436139692           ~ 2 0
13 SDSS J172453.57+581727.8 * 17 24 53.5694427408 +58 17 27.806701740           ~ 3 0
14 Gaia DR3 1433252164591733504 * 17 25 05.7310189809 +58 37 40.958590559           ~ 1 0
15 Gaia DR3 1432965054618434560 * 17 26 13.8595385615 +57 43 30.486719518           ~ 1 0
16 SDSS J172738.34+581547.1 * 17 27 38.3405341920 +58 15 47.132688780           ~ 3 0
17 Gaia DR3 1434407579513539072 * 17 30 16.1001519869 +57 43 16.608219065           ~ 1 0
18 Gaia DR3 1422045976440765568 * 17 31 14.7723752386 +56 32 13.613403542           ~ 1 0
19 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
20 NAME Local Group GrG ~ ~           ~ 9325 0

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