A dataset provided by the European Space Agency

Proposal ID 0120236
Obs ID 01202360001, 01202360002
Title A multiwavelength study of Sco X-1 and its relativistic jets
Download Data Associated to the proposal https://isla.esac.esa.int/tap/download/bundle?format=ascii_curl&product_id=prop_id:0120236
DOI https://doi.org/10.57780/esa-1ortxka
Author Stella
Abstract A hard X-ray component extending up to several hundred keV has been recently discovered in Sco X-1 and a few others Z-sources, i.e. low mass X-ray binaries, LMXRBs which host an old, weakly magnetized and fastly spinning neutron star accreting at rates close to the Eddington limit. Among sources accreting at near-Eddington rates, only black hole candidates (BHC) were known to possess similar high energy tails. A variety of models for the hard X-ray components of BHCs has been proposed, including thermal, non thermal and bulk motion COmptonisation, shock emission or annihilation in a pair dominated plasma cloud. The presence of a similar hard component in Z-sources opens up a new area of investigation for neutron stars accreting at high rates. Z-sources are known to have highly variable radio counterparts, indicating episodic ejection of matter at relativistic energies. Recent observations of the radio source associated with Sco X-1 revealed variable lobes on opposite sidesof the central source propagating outwards at about 0.4-0.5 c. A detailed investigation of these phenomena in Sco X-1 and the extent to which they parallel those observed in stellar mass BHCs is the main aim of our program. This is based on coordinated observations to be carried out simultaneously from soft gamma ray to X-ray energies and in the V-band, near-IR and radio. We request a sigle 300 ksec INTEGRAL observation. In particular we will:(a) study the correlated variability from the soft gamma rays to the radio;(b) investigate the hard X-ray continuum of the source up to energies of ~ 700-800 keV and its relation to the source state as determined through multiwavelength observations;(c) search for high energy emission lines similar to those observed in Nova Muscae 1991.
Publications
Temporal Coverage 2003-08-01T20:46:47Z / 2003-08-13T19:41:14Z
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, Stella, 2025, 'A multiwavelength study of Sco X-1 and its relativistic jets', 1.0, European Space Agency, https://doi.org/10.57780/esa-1ortxka