2018A&A...617L...8S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:42:08

2018A&A...617L...8S - Astronomy and Astrophysics, volume 617, L8-8 (2018/9-1)

NuSTAR and NICER reveal IGR J17591-2342 as a new accreting millisecond X-ray pulsar.

SANNA A., FERRIGNO C., RAY P.S., DUCCI L., JAISAWAL G.K., ENOTO T., BOZZO E., ALTAMIRANO D., DI SALVO T., STROHMAYER T.E., PAPITTO A., RIGGIO A., BURDERI L., BULT P.M., BOGDANOV S., GAMBINO A.F., MARINO A., IARIA R., ARZOUMANIAN Z., CHAKRABARTY D., GENDREAU K.C., GUILLOT S., MARKWARDT C. and WOLFF M.T.

Abstract (from CDS):

We report the discovery by the Nuclear Spectroscopic Telescope Array (NuSTAR) and the Neutron Star Interior Composition Explorer (NICER) of the accreting millisecond X-ray pulsar IGR J17591-2342. Coherent X-ray pulsations around 527.4Hz (1.9ms) with a clear Doppler modulation were detected. This implies an orbital period of ∼8.8h and a projected semi-major axis of ∼1.23 lt-s. With the binary mass function, we estimate a minimum companion mass of 0.42M, obtained assuming a neutron star mass of 1.4M and an inclination angle lower than 60°, as suggested by the absence of eclipses or dips in the light curve of the source. The broad-band energy spectrum, obtained by combining NuSTAR, swift and INTEGRAL observations, is dominated by Comptonisation of soft thermal seed photons with a temperature of ∼0.7keV by electrons heated to 21keV. We also detect black-body-like thermal direct emission that is compatible with an emission region of a few kilometers and a temperature compatible with the seed source of Comptonisation. A weak Gaussian line centred on the iron Kα complex can be interpreted as a signature of disc reflection. A similar spectrum characterises the NICER spectra, which was measured when the outburst faded.

Abstract Copyright: © ESO 2018

Journal keyword(s): accretion, accretion disks - stars: low-mass - pulsars: general - stars: neutron - X-rays: binaries

Simbad objects: 6

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Number of rows : 6

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 V* V1037 Cas LXB 00 29 03.06 +59 34 19.0           ~ 231 1
2 SWIFT J0911.9-6452 X 09 12 02.43 -64 52 06.4           ~ 24 0
3 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11535 0
4 IGR J17591-2342 gam 17 59 08.789 -23 42 46.70           ~ 13 0
5 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 870 0
6 X Aql X-1 LXB 19 11 16.0572031521 +00 35 05.876658556           ~ 1011 1

    Equat.    Gal    SGal    Ecl

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2020.07.08-03:42:08

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