A dataset provided by the European Space Agency

Proposal ID 0420102
Obs ID 04201020001
Title A Study of the Warm Absorber in the Dipping LMXB 4U 1254-690 Using Broad-band Integral Observations
Download Data Associated to the proposal https://isla.esac.esa.int/tap/download/bundle?format=ascii_curl&product_id=prop_id:0420102
DOI https://doi.org/10.57780/esa-czpv7ss
Author Balman
Abstract We propose a 400 ksec INTEGRAL observation of the dipping low-mass X-ray binary (LMXB) 4U 1254-690 simultaneous with an accepted (priority A) 60 ksec XMM-Newton AO-5 obseravtion. Te 0.5-10 keV spectroscopy provided by XMM-Newton will be strongly enhanced by the INTEGRAL observation which will allow the continuum to be characterized to an expected energy of 300~keV. The changes in the 0.5--10 keV continuum and the H- and He- like Fe K absorption features around 6.5 keV during dips have been successfully modeledby changes in the column density and ionization state of a highly photo-ionized absorber (Boirin et al. 2005; Diaz Trigo et al. 2006). However, to accurately characterize the ionization state of the absorber it is necessary to know the overall level of the continuum above 10 keV, since this is where the bulk of the ionizingphotons are. These previous studies used non-contemporaneous BeppoSAX and R-XTE observations to estimate the power-law index of the high-energy continuum which introduces large uncertainties intheir estimates of the ionization parameter. The INTEGRAL observation proposed here, in conjunction with the alreadyapproved XMM-Newton observation, will provide for important new insights into the nature of photo-ionized plasmas in LMXB.
Publications
Temporal Coverage 2007-01-14T02:01:30Z / 2007-01-15T08:11:06Z
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 2025-03-25T09:54:34Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Balman, 2025, 'A Study of the Warm Absorber in the Dipping LMXB 4U 1254-690 Using Broad-band Integral Observations', 1.0, European Space Agency, https://doi.org/10.57780/esa-czpv7ss