2006A&A...459..777R


Query : 2006A&A...459..777R

2006A&A...459..777R - Astronomy and Astrophysics, volume 459, 777-781 (2006/12-1)

A search for stellar X-ray sources in the Sagittarius and Carina dwarf galaxies. I. X-ray observations.

RAMSAY G. and WU K.

Abstract (from CDS):

ROSAT observations found no convincing evidence for X-ray sources located in local dwarf spheroidal galaxies (dSph). Now with more sensitive instruments on board Chandra and XMM-Newton we can reach fainter luminosity levels. We report on an observation of the Sagittarius (Sgr) dSph made using Chandra and an observation of the Carina (Car) dSph made using XMM-Newton. Our observations are sensitive to sources with X-ray luminosities in the 0.1-10keV band of ∼1x1032erg/s and 3x1034erg/s for the Sgr and Car fields respectively. We have identified a total of 80 sources in the Sgr field and 53 sources in the Car field. Although the source numbers are roughly consistent with the expected number of background AGN, we found a small fraction of X-ray sources which were soft and could be located in the host dSph. Follow-up optical/IR observations may help to identify their optical counterparts and hence determine their nature.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: individual: Sagittarius - galaxies: individual: Carina - X-rays: binaries - X-rays: galaxies

VizieR on-line data: <Available at CDS (J/A+A/459/777): tablea1.dat tablea2.dat>

Nomenclature: Table A1: [RW2006c] Sgr NN (Nos 1-80). Table A2: [RW2006c] Car NN (Nos 1-53).

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

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11935 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10372 1
3 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1250 4
4 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1632 1
5 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1971 1
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16253 1
7 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1064 0
8 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4214 3
9 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1988 2
10 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1007 0
11 NAME Local Group GrG ~ ~           ~ 7768 0

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2022.09.28-12:19:49

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