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NGC 3115 is the nearest galaxy hosting a billion solar mass black hole and isalso a low-luminosity active galactic nucleus (LLAGN). X-ray observations ofthis LLAGN are able to spatially resolve the hot gas within the sphere ofgravitational influence of the supermassive black hole. These observations makeNGC 3115 an important testbed for black hole accretion theory in galacticnuclei since they constrain the outer boundary conditions of the hot accretionflow. We present a compilation of the multiwavelength spectral energydistribution (SED) of the nucleus of NGC 3115 from radio to X-rays. We reportthe results from modeling the observed SED with radiatively inefficientaccretion flow (RIAF) models. The radio emission can be well-explained bysynchrotron emission from the RIAF without the need for contribution from arelativistic jet. We obtain a tight constraint on the RIAF density profile,$\rho(r) \propto r^{-0.73_{-0.02} ^{+0.01}}$, implying that mass-loss throughsubrelativistic outflows from the RIAF is significant. The lower frequencyradio observation requires the synchrotron emission from a nonthermal electronpopulation in the RIAF, similarly to Sgr A*.

The multiwavelength spectrum of NGC 3115: Hot accretion flow properties