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Title: THE HARD X-RAY BEHAVIOR OF AQL X-1 DURING TYPE-I BURSTS

We report the discovery of an anti-correlation between the soft and hard X-ray light curves of the X-ray binary Aql X-1 when bursting. This behavior may indicate that the corona is cooled by the soft X-ray shower fed by the type-I X-ray bursts, and that this process happens within a few seconds. Stacking the Aql X-1 light curves of type-I bursts, we find a shortage in the 40-50 keV band, delayed by 4.5 ± 1.4 s with respect to the soft X-rays. The photospheric radius expansion bursts are different in that neither a shortage nor an excess shows up in the hard X-ray light curve.
Authors:
; ; ; ; ;  [1] ;  [2] ;  [3]
  1. Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing 100049 (China)
  2. Institució Catalana de Recerca i Estudis Avançats (ICREA), E-08010 Barcelona (Spain)
  3. European Space Astronomy Centre (ESA/ESAC), Science Operations Department, Villanueva de la Canñada (Madrid) (Spain)
Publication Date:
OSTI Identifier:
22215394
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 777; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMIC X-RAY BURSTS; DIAGRAMS; HARD X RADIATION; NEUTRONS; SHOWERS; SOFT X RADIATION; STARS; VISIBLE RADIATION