Mon. Not. R. Astron. Soc., 435, 2822-2834 (2013/November-2)
On the nature of the hard X-ray sources Swift J1907.3-2050, IGR J12123-5802 and IGR J19552+0044.
BERNARDINI F., DE MARTINO D., MUKAI K., FALANGA M., ANDRUCHOW I., BONNET-BIDAUD J.-M., MASETTI N., GONZALEZ BUITRAGO D.H., MOUCHET M. and TOVMASSIAN G.
Abstract (from CDS):
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, IGR J12123-5802 and IGR J19552+0044 based on XMM-Newton, Suzaku, Swift observations and ground-based optical and archival (near-IR) nIR/IR 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 multitemperature optically thin plasma absorbed by complex neutral material and a soft blackbody 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 (20.82h) binary period. IGR J12123-5802 is variable in the X-rays on a time-scale of ≳ 7.6h. No coherent pulsations are detected, but its spectral characteristics suggest that it could be a magnetic CV of the Intermediate Polar (IP) type. IGR J19552+0044 shows two X-ray periods, ∼ 1.38h and ∼ 1.69h and an X-ray spectrum characterized by a multitemperature plasma with little absorption. We derive a low accretion rate, consistent with a CV below the orbital period gap. Its peculiar nIR/IR spectrum suggests a contribution from cyclotron emission. It could either be a pre-polar or an IP with the lowest degree of asynchronism.
© 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)
X-rays: individual: Swift J1907.3-2050 (also known as: V1082 Sgr) - X-rays: individual: Swift J1212.3-5806 (also known as: IGR J12123-5802 and 1RXS J121222.7-580118) - X-rays: individual: IGR J19552+0044 - X-rays: individual: WISE J195512.47+004536.6
Swift J1212.3-5802 is a misprint for Swift J1212.3-5806.
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