Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 849, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/aa92c2
Keywords
accretion, accretion disks; black hole physics; galaxies: elliptical and lenticular, cD; galaxies: individual (M87); galaxies: nuclei; X-rays: galaxies
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Funding
- NASA Chandra [GO7-18085X]
- NASA NuSTAR [NNX17GF12P]
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M87 hosts a 3-6 billion solar mass black hole with a remarkable relativistic jet that has been regularly monitored in radio to TeV bands. However, hard X-ray emission. greater than or similar to 10 keV, which would be expected to primarily come from the jet or the accretion flow, had never been detected from its unresolved X-ray core. We report NuSTAR detection up to 40 keV from the the central regions of M87. Together with simultaneous Chandra observations, we have constrained the dominant hard X-ray emission to be from its unresolved X-ray core, presumably in its quiescent state. The core spectrum is well fitted by a power law with photon index Gamma = 2.11(-0.11)(+0.15) . The measured flux density at 40 keV is consistent with a jet origin, although emission from the advection-dominated accretion flow cannot be completely ruled out. The detected hard X-ray emission is significantly lower than that predicted by synchrotron self-Compton models introduced to explain emission above a GeV.
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