2011A&A...532A..76F


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST23:07:44

2011A&A...532A..76F - Astronomy and Astrophysics, volume 532A, 76-76 (2011/8-1)

4U 0115+63: phase lags and cyclotron resonant scattering.

FERRIGNO C., FALANGA M., BOZZO E., BECKER P.A., KLOCHKOV D. and SANTANGELO A.

Abstract (from CDS):

High-mass X-ray binaries are among the brightest objects of our Galaxy in the high-energy domain (0.1-100keV). Despite our relatively good knowledge of their basic emission mechanisms, the complex problem of understanding their time- and energy- dependent X-ray emission has not been completely solved. In this paper, we study the energy-dependent pulse profiles of the high-mass X-ray binary pulsar 4U 0115+63 to investigate how they are affected by cyclotron resonant scattering. We analyzed archival BeppoSAX and RXTE observations performed during the giant outburst of the source that occurred in 1999. We exploited a cross correlation technique to compare the pulse profiles in different energy ranges and developed a relativistic ray-tracing model to interpret our findings. We also studied the phase dependency of the cyclotron absorption features by performing phase-resolved spectroscopy. The pulse profiles of 4U 0115+63 displayed clear ``phase-lags'' at energies close to those of the cyclotron absorption features that characterize the X-ray emission of the source. We reproduce this phenomenon qualitatively by assuming an energy-dependent beaming of the emission from the column surface and verify that our model is also compatible with the results of phase-resolved spectral analysis. We show that cyclotron resonant scattering affects the pulse profile formation mechanisms in a complex way, which necessitates both improvements in the modeling and the study of other sources to be better understood.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - pulsars: individual: 4U 0115+63

CDS comments: Paragraph 1 EXO 2030+275 is a probable misprint for EXO 2030+375 and V 0332+65 for V 0332+53.

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* V635 Cas HXB 01 18 31.9704429246 +63 44 33.071137750 17.05 16.64 15.19 14.34 13.22 B0.2Ve 661 0
2 V* BQ Cam HXB 03 34 59.9116460415 +53 10 23.296351781   17.16 15.42 14.26 13.04 O8.5Ve 398 1
3 HD 245770 HXB 05 38 54.5749436467 +26 18 56.839215267 9.30 9.84 9.39 8.77 8.30 O9/B0III/Ve 870 0
4 V* V779 Cen HXB 11 21 15.0920367078 -60 37 25.627505233   14.4       O9III/Veq 994 0
5 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1920 0
6 V* V2246 Cyg HXB 20 32 15.2744631713 +37 38 14.839930326   22.16 19.41 17.32 15.18 B0Ve 376 0

    Equat.    Gal    SGal    Ecl

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2020.07.03-23:07:44

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