2009A&A...498..233P


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.16CEST13:52:23

2009A&A...498..233P - Astronomy and Astrophysics, volume 498, 233-240 (2009/4-4)

The isolated neutron star candidate 2XMM J104608.7-594306.

PIRES A.M., MOTCH C., TUROLLA R., TREVES A. and POPOV S.B.

Abstract (from CDS):

Over the last decade, X-ray observations have revealed the existence of several classes of isolated neutron stars (INSs) which are radio-quiet or exhibit radio emission with properties much at variance with those of ordinary radio pulsars. The identification of new sources is crucial in order to understand the relations among the different classes and to compare observational constraints with theoretical expectations. A recent analysis of the 2XMMp catalogue provided fewer than 30 new thermally emitting INS candidates. Among these, the source 2XMM J104608.7-594306 appears particularly interesting because of the softness of its X-ray spectrum, kT=117±14eV and NH=(3.5±1.1)x1021cm–2 (3σ), and of the present upper limits in the optical, mB>26, mV>25.5 and mR>25 (98.76% confidence level), which imply a logarithmic X-ray-to-optical flux ratio log(FX/FV)>3.1, corrected for absorption. We present the X-ray and optical properties of 2XMM J104608.7-594306 and discuss its nature in the light of two possible scenarios invoked to explain the X-ray thermal emission from INSs: the release of residual heat in a cooling neutron star, as in the seven radio-quiet ROSAT-discovered INSs, and accretion from the interstellar medium. We find that the present observational picture of 2XMM J104608.7-594306 is consistent with a distant cooling INS with properties in agreement with the most up-to-date expectations of population synthesis models: it is fainter, hotter and more absorbed than the seven ROSAT sources and possibly located in the Carina Nebula, a region likely to harbour unidentified cooling neutron stars. The accretion scenario, although not entirely ruled out by observations, would require a very slow (∼10km/s) INS accreting at the Bondi-Hoyle rate.

Abstract Copyright:

Journal keyword(s): stars: neutron - X-rays: individual: 2XMM J104608.7-594306 - catalogs

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 - 2021
#notes
1 RX J0720.4-3125 N* 07 20 24.961 -31 25 50.21   26.1   27.0   ~ 285 0
2 NAME Carina I HII Region HII 10 43 32 -59 35.0           ~ 52 0
3 NAME Car II HII Region HII 10 44 47 -59 38.8           ~ 37 0
4 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 917 2
5 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2262 0
6 CXOGNC J104608.71-594306.4 N*? 10 46 08.719 -59 43 06.48           ~ 17 0
7 2E 2336 HXB 10 50 08.93 -59 53 19.9           Be 385 0
8 PSR J1052-5954 Psr 10 52 38.15 -59 54 46.1           ~ 17 0
9 RX J1412.9+7922 X 14 12 55.885 +79 22 04.10           ~ 28 0
10 PSR J1819-1458 Psr 18 19 34.173 -14 58 03.57           ~ 102 0
11 RX J1856.6-3754 N* 18 56 35.11 -37 54 30.5     25.7     ~ 393 0
12 RX J2143.0+0654 N*? 21 43 03.8 +06 54 20           ~ 73 0
13 NAME Magnificent Seven ? ~ ~           ~ 59 1

    Equat.    Gal    SGal    Ecl

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2021.04.16-13:52:23

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