The Galactic LMXB Population and the Galactic Centre Region

Abstract

Seventeen years of hard X-ray observations with the instruments of the INTEGRAL observatory, with a focus on the Milky Way and in particular on the Galactic Centre region, have provided a unique database for exploration of the Galactic population of low-mass X-ray binaries (LMXBs). Our understanding of the diverse energetic phenomena associated with accretion of matter onto neutron stars and black holes has greatly improved. We review the large variety of INTEGRAL based results related to LMXBs. In particular, we discuss the spatial distribution of LMXBs over the Galaxy and their X-ray luminosity function as well as various physical phenomena associated with Atoll and Z sources, bursters, symbiotic X-ray binaries, ultracompact X-ray binaries and persistent black hole LMXBs. We also present an up-to-date catalogue of confirmed LMXBs detected by INTEGRAL, which comprises 166 objects. Last but not least, the long-term monitoring of the Galactic Centre with INTEGRAL has shed light on the activity of Sgr A* in the recent past, confirming previous indications that our supermassive black hole experienced a major accretion episode just ~100 years ago. This exciting topic is covered in this review too.

arXiv comment60 pages, 26 figures, 2 tables, accepted for publication in New Astronomy Reviews

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• Global characteristics of the first IBIS/ISGRI catalogue sources: unveiling a murky episode of binary star evolution
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• A Possible Magnetar Nature for IGR J16358-4726
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• CXOGBS~J173620.2--293338: A Candidate Symbiotic X-ray Binary Associated with a Bulge Carbon Star
• IGR J17329-2731: The birth of a symbiotic X-ray binary
• Hard X-ray Bursts Detected by the IBIS Telescope Onboard the INTEGRAL Observatory in 2003-2004
• Possible Detection of an Emission Cyclotron Resonance Scattering Feature from the Accretion-powered Pulsar 4U 1626-67
• Study of the reflection spectrum of the LMXB 4U 1702-429
• Type I X-ray bursts, burst oscillations and kHz quasi-periodic oscillations in the neutron star system IGR J17191-2821
• The Case for a Low Mass Black Hole in the Low Mass X-ray Binary V1408 Aquilae (= 4U 1957+115)
• Case A and B evolution towards electron capture supernova
• Kinematical Structure of the Magellanic System
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• New insights on the puzzling LMXB 1RXS J180408.9-342058: the intermediate state, the clocked type-I X-ray bursts and much more
• Spectral states evolution of 4U 1728-34 observed by INTEGRAL and RXTE: non-thermal component detection
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• Resolving the Hard X-ray Emission of GX 5-1 with INTEGRAL
• The 5 hr pulse period and broadband spectrum of the Symbiotic X-ray Binary 3A 1954+319
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• Probing the clumping structure of Giant Molecular Clouds through the spectrum, polarisation and morphology of X-ray Reflection Nebulae
• Soft gamma-ray constraints on a bright flare from the Galactic Center supermassive black hole
• Population of the Galactic X-ray binaries and eRosita
• Puzzling thermonuclear burst behaviour from the transient low-mass X-ray binary IGR J17473-2721
• INTEGRAL and BeppoSAX observations of the transient atoll source 4U 1608-522: from quiescent to hard spectral state
• XMM-Newton and INTEGRAL observations of the very faint X-ray transient IGRJ17285-2922/XTEJ1728-295 during the 2010 outburst
• INTEGRAL high energy behaviour of 4U 1812-12
• Chandra-HETGS Characterization of an Outflowing Wind in the accreting millisecond pulsar IGR J17591-2342
• An XMM-Newton and INTEGRAL view on the hard state of EXO 1745-248 during its 2015 outburst
• Swift J1734.5-3027: a new long type-I X-ray bursting source
• Exploring the spreading layer of GX 9+9 using RXTE and INTEGRAL
• Spectral evolution of bright NS LMXBs with INTEGRAL: an application of the thermal plus bulk Comptonization model
• Observations of the Ultra-compact X-ray Binary 4U 1543-624 in Outburst with NICER, INTEGRAL, Swift, and ATCA
• Variability of the symbiotic X-ray binary GX 1+4: Enhanced activity near periastron passage
• Two new bursting neutron star low-mass X-ray binaries: Swift J185003.2-005627 and Swift J1922.7-1716
• Discovery of type-I X-ray bursts from the low-mass X-ray binary 4U 1708-40
• Type-I bursts within outbursts of IGR J17473-2721
• Sample of LMXBs in the Galactic bulge. I. Optical and near-infrared constraints from the Virtual Observatory
• The 17 min orbital period in the Ultra Compact X-ray Binary 4U 0513-40
• On the origin of the hard X-ray tail in neutron-star X-ray binaries
• Investigating the origin of the faint non-thermal emission of the Arches cluster using the 2015-2016 NuSTAR and XMM-Newton X-ray observations
• Bursting behavior of the Galactic Center faint X-ray transient GRS 1741.9-2853
• X-ray softening during the 2008 outburst of XTE J1810-189
• Searching for the 511 keV annihilation line from galactic compact objects with the IBIS gamma ray telescope
• The discovery of hard X-ray emission in the persistent flux of the Rapid Burster
• The ultra-compact binary 4U1850-087 observed with INTEGRAL: hard X-ray emission from an X-ray burster
• IGR J17445-2747 - yet another X-ray burster in the Galactic bulge
• Discovery and identification of infrared counterpart candidates of four Galactic centre low mass X-ray binaries
• XMMU J181227.8-181234: a new ultracompact X-ray binary candidate
• Multiple X-ray bursts and the model of a spreading layer of accreting matter over the neutron star surface
• INTEGRAL high energy monitoring of the X-ray burster KS 1741-293
• High Energy Radiation from Neutron Star Binaries
• Renewed activity from the X-ray transient SAXJ 1810.8-2609 with INTEGRAL
• Ignition column depths of helium-rich thermonuclear bursts from 4U 1728-34
• Time-Variability of equivalent width of 6.4 keV line from the Arches Complex: reflected X-rays or charged particles?
• First Results from the IBIS/ISGRI Data Obtained During the Galactic Plane Scan. II. The Vela Region
• First broad band study of the mysterious source 1E 1743.1-2843
• The INTEGRAL long monitoring of persistent Ultra Compact X-ray Bursters
• SAXJ1712.6-3739: a persistent hard X-ray source as monitored with INTEGRAL
• Quasi-simultaneous Integral, Swift, And Nustar Observations Of The New X-ray Clocked Burster 1rxsj180408.9-342058
• X-raying molecular clouds with a short flare: probing statistics of gas density and velocity fields
• Low-Mass X-Ray Binary MAXI J1421-613 Observed by MAXI GSC and Swift XRT
• VI Photometry of Globular Clusters NGC6293 and NGC6541: The Formation of the Metal-Poor Inner Halo Globular Clusters
• Observations of the X-ray Burster MX 0836-42 by the INTEGRAL and RXTE Orbiting Observatories
• Single X-ray Bursts and the Model of a Spreading Layer of Accreting Matter over the Neutron Star Surface
• Optical spectroscopy of the microquasar GRS 1758-258: a possible intermediate mass system?
• The 2008 outburst of IGR J17473--2721: evidence for a disk corona?
• New insights into the quasi-periodic X-ray burster GS 0836-429
• Serpens X-1 observed by INTEGRAL
• Sample of optically unidentified X-ray binaries in the Galactic bulge. Constraints on the physical nature from infrared photometric surveys
• First INTEGRAL Observations of Eight Persistent Neutron Star Low Mass X-ray Binaries
• IBIS performances during the Galactic Plane Scan - I. The Cygnus region
• Hard X-ray Tail Discovered in the Clocked Burster GS 1826-238
• HEXTE Studies of Sco X-1 Spectra: Detections of Hard X-Ray Tails Beyond 200 keV
• Updating the orbital ephemeris of the dipping source XB 1254-690 and the distance to the source
• 3xmm j181923.7$-$170616: an x-ray binary with a 408s pulsar
• High energy power-law tail in X-ray binaries and bulk Comptonization due to a outflow from a disk

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• The cyclotron line energy in Her X-1: stable after the decay
• The Galactic neutron star population I - an extragalactic view of the Milky Way and the implications for fast radio bursts
• Sgr B2 hard X-ray emission with INTEGRAL after 2009: still detectable?
• The spin measurement of MAXI J1348-630 using the Insight-HXMT data
• Multi-band observations of Swift J0840.7-3516: a new transient ultra-compact X-ray binary candidate
• Investigating the true nature of three hard X-ray sources
• Ultra-compact X-ray Binaries: A Review
• Deep Hard X-ray Survey of the M81 Field Based on INTEGRAL Data
• High Energy Emission from the Galactic Center