INTEGRAL high energy behaviour of 4U 1812-12

Abstract

The low mass X-ray binary system 4U 1812-12 was monitored with the INTEGRAL observatory in the period 2003-2004 and with BeppoSAX on April 20, 2000. We report here on the spectral and temporal analysis of both persistent and burst emission. The full data set confirms the persistent nature of this burster, and reveals the presence of emission up to 200 keV. The persistent spectrum is well described by a comptonization (CompTT) model plus a soft blackbody component. The source was observed in a hard spectral state with a 1-200 keV luminosity of 2*10^(36) ergs/s and L/LEdd~1% and no meaningful flux variation has been revealed, as also confirmed by a 2004 RXTE observation. We have also detected 4 bursts showing double peaked profiles and blackbody spectra with temperatures ranging from 1.9 to 3.1 keV.

arXiv comment6 pages, 4 figures. Accepted for publication by A&A

References in corpus (10)

• ISGRI: the INTEGRAL Soft Gamma-Ray Imager
• The INTEGRAL Science Data Centre (ISDC)
• The broad-band power spectra of X-ray binaries
• The INTEGRAL/IBIS Scientific Data Analysis
• The Integral Burst Alert System (IBAS)
• The observers' view of (very) long X-ray bursts: they are super!
• First results from the INTEGRAL Galactic plane scans
• Chandra Observations of the Faintest Low-Mass X-ray Binaries
• Simultaneous BeppoSAX and Rossi X-ray Timing Explorer observations of 4U1812-12
• A Lack of Radio Emission from Neutron Star Low Mass X-ray Binaries

Cited by in corpus (11)

• UltraCompCAT: a comprehensive Catalogue of Ultra-Compact and Short Orbital Period X-ray Binaries
• Accretion Geometry of the Low-Mass X-ray Binary Aquila X-1 in the Soft and Hard States
• The Galactic LMXB Population and the Galactic Centre Region
• Integral/Ibis Census of the Sky Beyond 100 kev
• Galactic Ultracompact X-ray Binaries: Empirical Luminosities
• Suzaku Observation of the High-Inclination Binary EXO 0748-676 in the Hard State
• Renewed activity from the X-ray transient SAXJ 1810.8-2609 with INTEGRAL
• Earth Occultation Imaging of the Low Energy Gamma-Ray Sky with GBM
• An enigmatic hump around 30 keV in Suzaku spectra of Aquila X-1 in the Hard State
• Optical spectroscopy of 4U 1812-12: an ultra-compact X-ray binary seen through an H II region
• A tentative 114-minute orbital period challenges the ultra-compact nature of the X-ray binary 4U 1812-12