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