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On the Nature of the Hard X-ray Sources SWIFT J1907.3-2050, IGR J12123-5802 and IGR J19552+0044The 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.
Document ID
20150000280
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Bernardini, F. (Wayne State Univ. Detroit, MI, United States)
De Martino, D. (Osservatorio Astronomico di Capadimonte Napoli, Italy)
Mukai, K. (Maryland Univ. Baltimore County Baltimore, MD, United States)
Falanga, M. (International Space Science Inst. Bern, Switzerland)
Andruchow, I. (La Plata Univ. Argentina)
Bonnet-Bidaud, J.-M. (CEA Saclay, Service d'Astrophysique Gif-sur-Yvette, France)
Masetti, N. (Istituto Nazionale di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF) Bologna, Italy)
Gonzalez Buitrago, D. H. (Universidad Nacional Autonoma de Mexico Ensenada, Mexico)
Mouchet, M. (Paris VII Univ. France)
Tovmassian, G. (Universidad Nacional Autonoma de Mexico Ensenada, Mexico)
Date Acquired
January 8, 2015
Publication Date
August 6, 2013
Publication Information
Publisher: Published by Oxford University Press on behalf of the Royal Astronomical Society
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN15845
Funding Number(s)
CONTRACT_GRANT: NNG06EO90A
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
individual:
X-rays:
Swift J1907.3 - 2050

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