A dataset provided by the European Space Agency

Proposal ID 0120284
Obs ID 01202840001
Title The nature of the hard X-ray component in Sco X-1
Download Data Associated to the proposal https://isla.esac.esa.int/tap/download/bundle?format=ascii_curl&product_id=prop_id:0120284
DOI https://doi.org/10.57780/esa-4su947x
Author Van der Klis
Abstract Scorpius X-1 is the archetypal neutron star binary; as the brightest X-ray binary and with an extremely well-determined distance it offers a unique opportunity to quantitatively study the magnitude and spectrum of accretion-powered emission processes. As well as thermal optical, UV and soft X-ray emission originating in the viscous dissipation of gravitational potential energy, strongly non-thermal processes requiring a large fraction of the accretion power budget are evident in radio and hard X-ray bands. Observations in these two bands reveal the most energetic processes in such systems, diagnosing both the innermost accretion flow, which is well within the strong-field gravity region near the neutron star and the relativistic outflows (the radio jets). Recent work has revealed a strong link between these two relativistic regimes, but the nature of this link is, as yet, unclear. Also in recent work, our most fundamental asumptions about the energetics of the accretion/ejection processes have been called into question. We will use INTEGRAL, together with ground-based facilities, to study these and related issues. By imaging the radio structure of Scorpius X-1 (core-jet and lobe impact sites) with intercontinental VLBI simultaneously with INTEGRAL observations we can directly determine the relation between hard X-ray excess and jet in this system. By combining INTEGRALs wide band with optical/IR and radio we will obtain a unique coverage of the electromagnetic as well as mechanical energy losses from the system.
Publications
Temporal Coverage 2003-07-30T16:06:00Z / 2003-08-01T20:30:41Z
Version 1.0
Mission Description The INTEGRAL (International Gamma-Ray Astrophysics Laboratory) mission, launched by the European Space Agency (ESA) on October 17, 2002, was designed to study high-energy phenomena in the universe. INTEGRAL was operating until february 2025 and it was equipped with three high-energy instruments: the Imager on Board the INTEGRAL Satellite (IBIS), the Spectrometer on INTEGRAL (SPI), and the JEM-X (Joint European Monitor for X-rays). Its Optical Monitoring Camera (OMC) provided optical V-band magnitude measurements, complementing the high-energy observations.
Creator Contact https://www.cosmos.esa.int/web/integral/helpdesk
Date Published 2025-03-25T09:54:30Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Van der Klis, 2025, 'The nature of the hard X-ray component in Sco X-1', 1.0, European Space Agency, https://doi.org/10.57780/esa-4su947x