Proposal ID | 007994 |
Title | X-Ray Line Beaming in Cataclysmic Variables due to Resonance Scattering |
Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0079940101 |
DOI | https://doi.org/10.5270/esa-geopyvj |
Principal Investigator, PI | Mr Yukikatsu TERADA |
Abstract | Galactic compact objects with extremely strong ionizedFe emission lines, with the equivalent width (EW) reachingsim 4000 eV, have been discovered with ASCA, includingAX~J1842.8-0423 and RX~J1802.1+1804.These objects are thought to be binary systems containingmagnetized white dwarf (WD). A possible interpretation ofthe strong Fe-K line is the line-photon beaming in the WDaccretion column, due to resonance scattering of line photonsaugmented by the vertical velocity gradient there. To firmlyestablish the proposed mechanism, an XMM observation of a similar system, AX~J2315-592, is proposed. Uninterrupted coverage will accurately quantify how the line equivalent widths of many ion species change as the white dwarf rotates. |
Publications |
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Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
Temporal Coverage | 2005-10-22T09:39:09Z/2005-10-22T14:54:24Z |
Version | 17.56_20190403_1200 |
Mission Description | The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis. |
Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
Date Published | 2006-11-22T00:00:00Z |
Last Update | 2025-01-27 |
Keywords | "binary systems", "vertical velocity gradient", "white dwarf rotates", "wd accretion column", "cataclysmic variables", "uninterrupted coverage", "sim 4000 ev", "line equivalent widths", "galactic compact objects", "resonance scattering", "j2315 592", "J1842.8", "equivalent width ew", "XMM", "ion species", "line photons augmented", "line photon beaming" |
Publisher And Registrant | European Space Agency |
Credit Guidelines | European Space Agency, Mr Yukikatsu TERADA, 2006, 'X-Ray Line Beaming in Cataclysmic Variables due to Resonance Scattering', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-geopyvj |