IGRJ18179-1621: An obscured X-ray pulsar discovered by INTEGRAL

Abstract

We report on all the INTEGRAL and Swift data collected during the first outburst observed from IGRJ18179-1621. The broad-band spectral analysis showed that the X-ray emission from the source is heavily absorbed (N_H~10^23 cm^-2), and well described by a flat power-law with a high energy rollover (cutoff energy 9-12 keV, e-folding energy 4-7 keV). We found some evidence of a cyclotron absorption feature at 22\pm1 keV. Together with the pulsations at 11.8s discovered in the XRT data, this evidence would suggest that IGRJ18179-1621 is an obscured magnetized accreting neutron star, possibly part of a supergiant high mass X-ray binary or a Be X-ray binary system.

Accepted for publication on A&A V2. Corrected few typos

References in corpus (7)

• Be/X-ray binaries
• High variability in Vela X-1: giant flares and off states
• Broadband Observations of the Be/X-ray Binary Pulsar RX J0440.9+4431: Discovery of a Cyclotron Absorption Line
• INTEGRAL observation of the accreting pulsar GX 1+4
• Broadband spectroscopy using two Suzaku observation of the HMXB GX 301-2
• Her X-1: the positive cyclotron line energy / luminosity correlation
• INTEGRAL and Swift observations of IGRJ19294+1816 in outburst

Cited by in corpus (5)

• The Ups & Downs of Accreting X-Ray Pulsars: Decade-long observations with the Fermi Gamma-Ray Burst Monitor
• Advances in Understanding High-Mass X-ray Binaries with INTEGRAL and Future Directions
• On More Sensitive Periodogram Statistics
• Evolution implications of neutron star magnetic fields: inferred from pulsars and cyclotron lines of HMXBs
• Monte-Carlo simulations on possible collimation effects of outflows to fan-beamed emission of ultraluminous accreting X-ray pulsars