15-20 March 2020
Europe/Berlin timezone

Surveys of Normal Galaxies at harder X-ray energies with NuSTAR

18 Mar 2020, 11:45


Oral Presentation X-ray emission from Galaxies


Ann Hornschemeier (NASA GSFC)


Since its launch in 2012, NuSTAR, as the first imaging X-ray observatory to operate in the 3-80 keV band, has executed an observing program on normal and starburst galaxies, including several galaxies in the Local Group, through a combination of science team, Legacy project, and Guest Observer time. We report on recent results from a synthesis analysis of a dozen galaxies observed by NuSTAR, including an analysis that divides X-ray binaries by compact object type (neutron star vs black hole), and measurement of the overall hard X-ray SED of galaxies. We have found a nearly universal turnover in the hard X-ray SED that may be attributed to super-Eddington accretion onto ULX sources. We have also found that the NS Luminosity function may have a turnover near the Eddington limit for a 1.4 solar mass NS. We discuss our findings on NS/BH ratios in galaxies and prospects for the future. In closing, we touch upon follow up in the harder X-ray band by NuSTAR and successor facilities of interesting subclasses of eROSITA-observed galaxies.

Primary author


Dr Neven Vulic (University of Maryland College Park/NASA GSFC) Dr Mihoko Yukita (NASA GSFC/JHU) Ms Margaret Lazzarini (University of Washington, Seattle) Dr Andreas Zezas (University of Crete) Dr Valsamo Antoniou (Smithsonian Astrophysical Observatory ) Dr Kristen Garofali (University of Arkansas) Dr Bret Lehmer (University of Arkansas) Dr Thomas Maccarone (Texas Tech University) Dr Andrew Ptak (NASA GSFC) Dr Tonia Venters (NASA GSFC) Dr Daniel Wik (University of Utah) Dr Ben Williams (University of Washington, Seattle)

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