2013A&A...550A..89D


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST01:37:14

2013A&A...550A..89D - Astronomy and Astrophysics, volume 550A, 89-89 (2013/2-1)

X-ray follow-ups of XSS J12270-4859: a low-mass X-ray binary with gamma-ray Fermi-LAT association.

DE MARTINO D., BELLONI T., FALANGA M., PAPITTO A., MOTTA S., PELLIZZONI A., EVANGELISTA Y., PIANO G., MASETTI N., BONNET-BIDAUD J.-M., MOUCHET M., MUKAI K. and POSSENTI A.

Abstract (from CDS):

XSSJ1227.0-4859 is a peculiar, hard X-ray source recently positionally associated to the Fermi-LAT source 1FGLJ1227.9-4852/2FGLJ1227.7-4853. Multi-wavelength observations have added information on this source, indicating a low-luminosity low-mass X-ray binary (LMXB), but its nature is still unclear. To progress in our understanding, we present new X-ray data from a monitoring campaign performed in 2011 with the XMM-Newton, RXTE, and Swift satellites and combine them with new gamma-ray data from the Fermi and AGILE satellites. We complement the study with simultaneous near-UV photometry from XMM-Newton and with previous UV/optical and near-IR data. We analysed the temporal characteristics in the X-rays, near-UV, and gamma rays and studied the broad-band spectral energy distribution from radio to gamma rays. The X-ray history of XSSJ1227 over 7yr shows a persistent and rather stable low-luminosity (6x1033d1kpc2erg/s) source, with flares and dips being peculiar and permanent characteristics. The associated Fermi-LAT source 2FGLJ1227.7-4853 is also stable over an overlapping period of 4.7yr. Searches for X-ray fast pulsations down to msec give upper limits to pulse fractional amplitudes of 15-25% that do not rule out a fast spinning pulsar. The combined UV/optical/near-IR spectrum reveals a hot component at ∼13kK and a cool one at ∼4.6kK. The latter would suggest a late-type K2-K5 companion star, a distance range of 1.4-3.6kpc, and an orbital period of 7-9h. A near-UV variability (>6h) also suggests a longer orbital period than previously estimated. The analysis shows that the X-ray and UV/optical/near-IR emissions are more compatible with an accretion-powered compact object than with a rotational powered pulsar. The X-ray to UV bolometric luminosity ratio could be consistent with a binary hosting a neutron star, but the uncertainties in the radio data may also allow an LMXB black hole with a compact jet. In this case, it would be the first associated with a high-energy gamma-ray source.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - X-rays: binaries - gamma rays: stars - binaries: close

Simbad objects: 25

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Number of rows : 25

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 1FGL J0101.0-6423 gam 01 01 11.1163 -64 22 30.171           ~ 40 0
2 LS I +61 303 HXB 02 40 31.6641883136 +61 13 45.591138110 11.27 11.61 10.75 10.19 9.55 B0Ve 761 2
3 PSR J0614-3329 Psr 06 14 10.3479 -33 29 54.116           ~ 72 1
4 1FGL J1018.6+5856 gam 10 18.6 +58 56           ~ 2 0
5 PSR J1023+0038 LXB 10 23 47.6840307966 +00 38 41.006983532     17.31     GV 309 0
6 V* KV UMa HXB 11 18 10.7922353051 +48 02 12.319175505     12.25     K5V-M1V 721 0
7 3FGL J1207.2-5052 Bz? 12 07 10.11 -50 51 38.2           ~ 15 0
8 3FGL J1218.8-4827 BLL 12 19 02.27 -48 26 28.1           ~ 16 0
9 XSS J12270-4859 LXB 12 27 58.7475950389 -48 53 42.826034125           ~ 205 0
10 PSR J1231-1411 Psr 12 31 11.3069 -14 11 43.628           ~ 91 0
11 2FGL J1231.3-5112 gam 12 31 36 -51 13.3           ~ 18 0
12 PSR J1514-4946 Psr 15 14 19.1142 -49 46 15.528           ~ 33 0
13 V* V821 Ara HXB 17 02 49.3810714542 -48 47 23.163091737 16.20 16.30 15.5     ~ 1764 0
14 NAME Slow Burster LXB 17 31 57.73 -33 50 02.5           ~ 758 1
15 NAME XTE J17464-3213 LXB 17 46 15.59637 -32 14 00.8600           ~ 599 0
16 PSR J1816+4510 Psr 18 16 35.9314 +45 10 33.864           ~ 68 0
17 V* V479 Sct HXB 18 26 15.0561532140 -14 50 54.249464136 12.02 12.23 11.27 11.04   ON6V((f))z 492 2
18 1FGL J1902.0-5110 gam 19 02 02.8476 -51 05 56.969           ~ 33 0
19 X Aql X-1 LXB 19 11 16.0572031521 +00 35 05.876658556           ~ 1011 1
20 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2284 0
21 V* V404 Cyg HXB 20 24 03.820 +33 52 01.90 14.50 14.20 12.7     K0IV 1090 0
22 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1765 2
23 V* LY Aqr Psr 20 51 07.5145 -08 27 37.795           ~ 162 2
24 PSR J2214+3000 Psr 22 14 38.8480 +30 00 38.209           ~ 77 0
25 PSR J2339-0533 Psr 23 39 38.7410542334 -05 33 05.108159666     18.48     ~ 81 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-01:37:14

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