Broadband Spectral Modeling of NGC 253 from Hard X-rays to TeV Gamma Rays

ORAL

Abstract

We present the latest results from detailed broadband spectral modeling of the nearby starburst galaxy NGC 253 from keV to TeV energies. The mechanism for producing the gamma-ray emission in starburst galaxies is difficult to determine solely from Fermi-LAT and HESS data. NuSTAR observations of NGC 253 in the hard X-ray band (10--30 keV) provide the most sensitive observations to date of the non-thermal emission in that bandpass, which in turn may constrain the role of hadronic and leptonic interactions in producing the GeV emission.

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Authors

  • Tonia Venters

    NASA Goddard Space Flight Center

  • Daniel Wik

    Johns Hopkins University; NASA Goddard Space Flight Center

  • Bret Lehmer

    Johns Hopkins University; NASA Goddard Space Flight Center

  • Mihoko Yukita

    Johns Hopkins University; NASA Goddard Space Flight Center

  • Ann Hornschemeier

    NASA GSFC, NASA Goddard Space Flight Center

  • Andrew Ptak

    NASA Goddard Space Flight Center

  • Andreas Zezas

    University of Crete

  • Keith Bechtol

    KICP / University of Chicago, University of Chicago

  • Megan Argo

    ASTRON

  • Vallia Antoniou

    Harvard-Smithsonian Center for Astrophysics

  • Fiona Harrison

    Caltech

  • Roman Krivonos

    UC Berkeley

  • Jean-Christophe Leyder

    NASA Goddard Space Flight Center; Universities Space Research Association

  • Thomas Maccarone

    Texas Tech University

  • Daniel Stern

    JPL/Caltech

  • William Zhang

    NASA Goddard Space Flight Center