2020A&A...640A.106M


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.26CET14:51:20

2020A&A...640A.106M - Astronomy and Astrophysics, volume 640A, 106-106 (2020/8-1)

Spectroscopic study of MATLAS-2019 with MUSE: An ultra-diffuse galaxy with an excess of old globular clusters.

MULLER O., MARLEAU F.R., DUC P.-A., HABAS R., FENSCH J., EMSELLEM E., POULAIN M., LIM S., AGNELLO A., DURRELL P., PAUDEL S., SANCHEZ-JANSSEN R. and VAN DER BURG R.F.J.

Abstract (from CDS):

The MATLAS deep imaging survey has uncovered a plethora of dwarf galaxies in the low density environment it has mapped. A fraction of them are unusually extended and have low surface brightness. Among these so-called ultra-diffuse galaxies, a few seem to host an excess of globular clusters (GCs). With the integral field unit spectrograph MUSE we have observed one of these galaxies - MATLAS J15052031+0148447 (MATLAS-2019) - located toward the nearby group NGC 5846 and measured its systemic velocity, age, and metallicity, and that of its GC candidates. For the stellar body of MATLAS-2019 we derive a metallicity of -1.33–0.01+0.19dex and an age of 11.2–0.8+1.8Gyr. For some of the individual GCs and the stacked GC population, we derive consistent ages and metallicities. From the 11 confirmed GCs and using a Markov Chain Monte Carlo approach we derived a dynamical mass-to-light ratio of 4.2–3.4+8.6M/L. This is at the lower end of the luminosity-mass scaling relation defined by the Local Group dwarf galaxies. Furthermore, we could not confirm or reject the possibility of a rotational component in the GC system. If present, this would further modify the inferred mass. Follow-up observations of the GC population and of the stellar body of the galaxy are needed to assess whether this galaxy lacks dark matter, as was suggested for the pair of dwarf galaxies in the field of NGC 1052, or if this is a misinterpretation arising from systematic uncertainties of the method commonly used for these systems and the large uncertainties of the individual GC velocities.

Abstract Copyright: © O. Müller et al. 2020

Journal keyword(s): galaxies: kinematics and dynamics - galaxies: stellar content - galaxies: dwarf

VizieR on-line data: <Available at CDS (J/A+A/640/A106): list.dat fits/*>

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

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1115 2
2 [CVD2018] NGC1052-DF4 LSB 02 39 15.10 -08 06 58.6     16.5   16.2 ~ 32 0
3 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1489 1
4 NGC 1052 GiP 02 41 04.79851 -08 15 20.7517 11.84 11.41 10.47 10.71   ~ 1155 2
5 NAME NGC 1052 Group GrG 02 41 09.3 -08 07 10           ~ 51 0
6 LEDA 3097693 LSB 02 41 46.5 -08 24 08     16.2   15.8 ~ 71 0
7 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1568 0
8 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5909 0
9 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 981 2
10 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4267 2
11 SMDG J1300580+265835 LSB 13 00 58.0 +26 58 35           ~ 62 0
12 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3032 0
13 NGC 5813 LIN 15 01 11.265 +01 42 07.09 12.00 11.45 10.46 10.06   ~ 585 1
14 NAME NGC 5846 Group GrG 15 05 47.0 +01 34 25   10.0       ~ 131 0
15 NGC 5846 BiC 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 780 1
16 NGC 5865 GiP 15 09 49.453 +00 28 11.88   13.5       ~ 85 0
17 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1443 0
18 NAME Local Group GrG ~ ~           ~ 7074 0

    Equat.    Gal    SGal    Ecl

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2020.10.26-14:51:20

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