C.D.S. - SIMBAD4 rel 1.7 - 2021.07.26CEST23:27:41

2018A&A...614A.144S - Astronomy and Astrophysics, volume 614A, 144-144 (2018/6-1)

Dwarf irregular galaxy Leo A extends even farther, according to HST WFC3 photometry.


Abstract (from CDS):

Context. Leo A is an isolated gas-rich dwarf irregular galaxy of low stellar mass and metallicity residing at the outskirts of the Local Group. Ages of the stellar populations in Leo A range from ∼10 Myr to ∼10 Gyr. A large stellar halo (up to the deprojected distance of ∼1.7 kpc) was discovered based on Subaru wide-field photometry of red giant branch stars.
Aims. We aim to study stellar populations at the very outer region of the Leo A galaxy.
Methods. We analysed HST WFC3 archive observation data in the field that is partly located beyond the previously known limits of the Leo A galaxy. We performed photometry of star-like objects in the F475W and F814W passbands and studied the spatial distribution of the Leo A stars below the horizontal branch.
Results. We report a discovery of stellar halo populations (subgiants and faint red giants) in the Leo A galaxy extending up to ∼2.3 kpc deprojected distance from the galaxy centre. Analysis of the colour-magnitude diagram suggests old (>5 Gyr) stellar populations of very low metallicity (Z ∼ 0.0001).

Abstract Copyright: © ESO 2018

Journal keyword(s): galaxies dwarf - galaxies stellar content - galaxies: individual: Leo A (DDO 69)

VizieR on-line data: <Available at CDS (J/A+A/614/A144): table.dat>

Nomenclature: Table: [SCL2018] JDDD.ddddd+DD.ddddd₦N=128.

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

CDS comments: Paragraph.3 C1-V01 not in SIMBAD.

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 NAME Leo Dwarf Irregular Galaxy G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 561 0
2 NAME Local Group GrG ~ ~           ~ 7314 0

    Equat.    Gal    SGal    Ecl

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