期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 435, 期 4, 页码 2822-2834出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt1434
关键词
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
资金
- ESA Member States
- Swift
- NASA
- National Aeronautics and Space Administration
- Two Micron All Sky Survey (2MASS)
- University of Massachusetts
- Infrared Processing and Analysis Center (IPAC)/Caltech
- NSF
- Sloan Digital Sky Survey (SDSS)
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 (20.82 h) binary period. IGR J12123-5802 is variable in the X-rays on a time-scale of greater than or similar to 7.6 h. 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, similar to 1.38 h and similar to 1.69 h 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.
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