Evidence for a Neutron Star in the non-pulsating massive X-ray binary 4U2206+54
arXiv:astro-ph/0405182 · doi:10.1051/0004-6361:20035743
Abstract
We present an analysis of archival RXTE and BeppoSAX data of the X-ray source 4U2206+54 . For the first time, high energy data (> 30 kev) are analyzed for this source. The data are well described by comptonization models (CompTT and BMC) in which seed photons with temperatures between 1.1 kev and 1.5 kev are comptonized by a hot plasma at 50 kev thereby producing a hard tail which extends up to, at least, 100 kev. We offer a new method of identification of neutron star systems using a temperature - luminosity relation. If a given X-ray source is characterized by a low bolometric luminosity and a relatively high color blackbody temperature (>1 kev) it has necessarily to be a neutron star rather than a black hole. From these arguments it is shown that the area of the soft photon source must be small (r ~ 1 km) and that the accretion disk, if present, must be truncated very far from the compact object. Here we report on the possible existence of a cyclotron line around 30 kev. The presence of a neutron star in the system is strongly favored by the available data.
arXiv commentAccepted for publication in A&A. 9 pages, 7 figures. Submitted to journal in November 2003
References in corpus (12)
- Observations of Accreting Pulsars
- First Results from the All-Sky Monitor on the Rossi X-ray Timing Explorer
- Spectral Properties of Accretion Disks Around Galactic and Extragalactic Black Holes
- In-flight Performance of the High Energy X-ray Timing Experiment on the Rossi X-ray Timing Explorer
- X-ray Spectral Formation in a Converging Fluid Flow: Spherical Accretion into Black Holes
- Confirmation of Two Cyclotron Lines in Vela X-1
- Do the Spectra of Soft X-ray Transients Reveal Bulk Motion Inflow Phenomenon?
- Why is it Difficult to Detect a Millisecond Pulsar in Neutron Star X-ray Binaries?
- The High-Energy Spectra of Accreting Black Holes: Observational Evidence for Bulk-Motion Infall
- On the nature of the hard X-ray source 4U2206+54
- Observational Signatures of Black Holes: Spectral and Temporal Features of XTE J1550-564
- 4U2206+54 - an Unusual High Mass X-ray Binary with a 9.6 Day Orbital Period but No Strong Pulsations
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- The Energy Spectrum of Anomalous X-ray Pulsars and Soft Gamma-ray Repeaters
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