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On the nature of the hard x-ray sources swift j1907.3-2050, igr j12123-5802 and igr j19552+0044
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | De Martino, D. Andruchow, I. Falanga, M. Masetti, N. Gonzalez Buitrago, D. H. Mukai, K. Bonnet-Bidaud, J.-M. Mouchet, M. Tovmassian, G. Bernardini, F. |
| Copyright Year | 2013 |
| Description | The INTEGRAL and Swift hard X-ray surveys have identified a large number of new sources, among which many are proposed as Cataclysmic Variables (CVs). Here we present the first detailed study of three X-ray selected CVs, Swift J1907.3-2050, IGRJ12123-5802, and IGRJ19552+0044 based on XMM-Newton, Suzaku, Swift observations and ground based optical and archival near-infrared/infrared data. Swift J1907.3-2050 is highly variable from hours to months-years at all wavelengths. No coherent X-ray pulses are detected but rather transient features. The X-ray spectrum reveals a multi-temperature optically thin plasma absorbed by complex neutral material and a soft black body component arising from a small area. These characteristics are remarkably similar to those observed in magnetic CVs. A supra-solar abundance of nitrogen could arise from nuclear processed material from the donor star. Swift J1907.3-2050 could be a peculiar magnetic CV with the second longest (20.82 hours) binary period. IGRJ12123-5802 is variable in the X-rays on a timescale of greater than or approximately 7.6 hours. No coherent pulsations are detected, but its spectral characteristics suggest that it could be a magnetic CV of the Intermediate Polar (IP) type. IGRJ19552+0044 shows two X-ray periods, approximately 1.38 hours and approximately 1.69 hours and a X-ray spectrum characterized by a multi-temperature plasma with little absorption. We derive a low accretion rate, consistent with a CV below the orbital period gap. Its peculiar near-infrared/infrared spectrum suggests a contribution from cyclotron emission. It could either be a pre-polar or an IP with the lowest degree of asynchronism. |
| File Size | 417069 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20150000280 |
| Archival Resource Key | ark:/13960/t6j152395 |
| Language | English |
| Publisher Date | 2013-08-06 |
| Access Restriction | Open |
| Subject Keyword | Individual: X-rays: Swift J1907.3 - 2050 Infrared Spectroscopy Plasmas Physics Ultraviolet Spectroscopy Optical Emission Spectroscopy Infrared Astronomy Orbits Wide-field Infrared Survey Explorer Spectrum Analysis Light Curve Photometry Xmm-newton Telescope X Ray Sources White Dwarf Stars X Ray Spectroscopy Ultraviolet Spectra Interstellar Magnetic Fields Infrared Spectra Nitrogen Swift Observatory Cataclysmic Variables X Rays Magnetic Stars X Ray Spectra Flux Rate X Ray Astronomy Ultraviolet Astronomy Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
