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Low-energy line emission from Cygnus X-2 observed with the BeppoSAX LECS

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arxiv astro-ph/9706009 v1 pith:SXAXQGSA submitted 1997-06-02 astro-ph

E. Kuulkers (1 , 2) , A. N. Parmar (1) , A. Owens (1) , T. Oosterbroek (1) , U. Lammers (1) ((1) ESA/ESTEC , (2) Univ. of Oxford) This is my paper · ORCID
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keywords emissionenergylinebepposaxcut-offcygnusfeaturenear
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We present a 0.2-10 keV spectrum of the low-mass X-ray binary Cygnus X-2 obtained using the Low Energy Concentrator Spectrometer on-board Bepposax. The spectrum can be described by a cut-off power-law model with absorption of (2.28 +/- 0.07) 10^{21} atoms/cm^2, a power-law index of 0.78 +/- 0.02 and a cut-off energy of 4.30 +/- 0.08 keV (68% confidence errors), except at energies near ~1 keV where excess emission is present. This can be modeled by a broad Gaussian line feature with an energy of 1.02 +/- 0.04 keV, a full width half-maximum of 0.47 +/- 0.07 keV and an equivalent width of 74 +/-^{25}_{11} eV. This result confirms earlier reports of line emission near 1 keV and shows the intensity and structure of the feature to be variable.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. A spectro-temporal view of normal branch oscillations in Cygnus X-2 as seen by NICER and NuSTAR

    astro-ph.HE 2024-11 conditional novelty 6.0 of 10

    A ~5.4 Hz normal branch oscillation in Cygnus X-2 is detected only in the 0.5-3 keV band, and the authors tentatively tie its origin to the same outer-disk photoionized plasma that emits Fe L.

  2. Evidence for Millihertz Oscillations in the bright atoll source GX 3+1

    astro-ph.HE 2026-06 unverdicted novelty 5.0 of 10

    Candidate mHz QPOs detected in GX 3+1 at 7-15 mHz with 0.51-1.41% rms, one surviving global significance, occurring at higher luminosities than in other NS LMXBs.

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