SEARCH for GAMMA-RAY EMISSION from AE AQUARII with SEVEN YEARS of FERMI LAT OBSERVATIONS

Jian Li, Diego F. Torres, Nanda Rea, Emma De Oña Wilhelmi, Alessandro Papitto, Xian Hou, Christopher W. Mauche

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    Abstract

    © 2016. The American Astronomical Society. All rights reserved. AE Aquarii (AE Aqr) is a cataclysmic binary hosting one of the fastest rotating (Pspin = 33.08 s) white dwarfs (WDs) known. Based on seven years of Fermi Large Area Telescope (LAT) Pass 8 data, we report on a deep search for gamma-ray emission from AE Aqr. Using X-ray observations from ASCA, XMM-Newton, Chandra, Swift, Suzaku, and NuSTAR, spanning 20 years, we substantially extend and improve the spin ephemeris of AE Aqr. Using this ephemeris, we searched for gamma-ray pulsations at the spin period of the WD. No gamma-ray pulsations were detected above 3δsignificance. Neither phase-averaged gamma-ray emission nor gamma-ray variability of AE Aqr is detected by Fermi LAT. We impose the most restrictive upper limit to the gamma-ray flux from AE Aqr to date: 1.3 × 10-12 erg cm-2 s-1 in the 100 MeV-300 GeV energy range, providing constraints on models.
    Original languageEnglish
    Article number35
    JournalAstrophysical Journal
    Volume832
    Issue number1
    DOIs
    Publication statusPublished - 20 Nov 2016

    Keywords

    • gamma rays: stars
    • novae, cataclysmic variables
    • X-rays: individual (AE Aquarii)

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