A Double-peaked Outburst of A 0535+26 Observed with INTEGRAL, RXTE, and Suzaku - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles The Astrophysical journal letters Year : 2013

A Double-peaked Outburst of A 0535+26 Observed with INTEGRAL, RXTE, and Suzaku

I. Caballero
  • Function : Author
K. Pottschmidt
  • Function : Author
D. M. Marcu
  • Function : Author
L. Barragan
  • Function : Author
C. Ferrigno
  • Function : Author
D. Klochkov
  • Function : Author
S. Suchy
  • Function : Author
J. Wilms
  • Function : Author
P. Kretschmar
  • Function : Author
A. Santangelo
I. Kreykenbohm
  • Function : Author
F. Fürst
  • Function : Author
R. Rothschild
  • Function : Author
R. Staubert
  • Function : Author
M. H. Finger
  • Function : Author
A. Camero-Arranz
  • Function : Author
K. Makishima
  • Function : Author
T. Enoto
W. Iwakiri
  • Function : Author
Y. Terada
  • Function : Author

Abstract

The Be/X-ray binary A 0535+26 showed a normal (type I) outburst in 2009 August. It is the fourth in a series of normal outbursts associated with the periastron, but is unusual because it presented a double-peaked light curve. The two peaks reached a flux of ~450 mCrab in the 15-50 keV range. We present results of the timing and spectral analysis of INTEGRAL, RXTE, and Suzaku observations of the outburst. The energy-dependent pulse profiles and their evolution during the outburst are studied. No significant differences with respect to other normal outbursts are observed. The centroid energy of the fundamental cyclotron line shows no significant variation during the outburst. A spectral hardening with increasing luminosity is observed. We conclude that the source is accreting in the sub-critical regime. We discuss possible explanations for the double-peaked outburst.

Dates and versions

in2p3-00903709 , version 1 (12-11-2013)

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Cite

I. Caballero, K. Pottschmidt, D. M. Marcu, L. Barragan, C. Ferrigno, et al.. A Double-peaked Outburst of A 0535+26 Observed with INTEGRAL, RXTE, and Suzaku. The Astrophysical journal letters, 2013, 764 (2), pp.L23. ⟨10.1088/2041-8205/764/2/L23⟩. ⟨in2p3-00903709⟩
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