2014A&A...570A..78B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST22:21:04

2014A&A...570A..78B - Astronomy and Astrophysics, volume 570A, 78-78 (2014/10-1)

The extended structure of the dwarf irregular galaxy Sagittarius.

BECCARI G., BELLAZZINI M., FRATERNALI F., BATTAGLIA G., PERINA S., SOLLIMA A., OOSTERLOO T.A., TESTA V. and GALLETI S.

Abstract (from CDS):

We present a detailed study of the stellar and HI structure of the dwarf irregular galaxy Sagittarius. We use new deep and wide field photometry to trace the surface brightness profile of the galaxy out to ≃5.0' (corresponding to ≃1600 pc) and down to µV≃30.0mag/arcsec2, thus showing that the stellar body of the galaxy is much more extended than previously believed, and it is similarly (or more) extended than the overall HI distribution. The whole major-axis profile is consistent with a pure exponential, with a scale radius of ≃340pc. The surface density maps reveal that the distribution of old and intermediate-age stars is smooth and remarkably flattened out to its edges, while the associated HI has a much rounder shape, is off-centred and presents multiple density maxima and a significant hole. No clear sign of systemic rotation is detectable in the complex HI velocity field. No metallicity gradient is detected in the old and intermediate age population of the galaxy, and we confirm that this population has a much more extended distribution than young stars (age≲1Gyr).

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - Local Group - galaxies: ISM

VizieR on-line data: <Available at CDS (J/A+A/570/A78): in6.dat>

Nomenclature: in6.dat: [BBF2014] NNNNN N=12694 among (Nos 1-14823).

Status at CDS:   All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 13

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Number of rows : 13

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 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1008 0
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10902 1
3 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 918 0
4 UGC 4879 G 09 16 02.0197873600 +52 50 42.052874443   14.0 13.2     ~ 104 0
5 NAME Leo Dwarf Irregular Galaxy G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 547 0
6 NAME Sextans B H2G 10 00 00.8201300945 +05 20 09.572530884 12.77 12.25 11.89 11.71   ~ 467 0
7 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 652 2
8 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2265 0
9 NGC 5275 IG 13 42 23.5614034378 +29 49 29.626388818   15.4       ~ 25 2
10 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1904 0
11 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11533 0
12 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 275 1
13 NAME Local Group GrG ~ ~           ~ 6970 0

    Equat.    Gal    SGal    Ecl

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2020.07.03-22:21:04

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