1 research outputs found
Internal gamma gamma-opacity in Active Galactic Nuclei and the consequences for the TeV observations of M87 and Cen A
Low Luminosity Active Galactic Nuclei (LLAGNs) possess the characteristic
features of more luminous Active Galactic Nuclei (AGNs) but exhibit a much
lower nuclear Halpha luminosity than their more luminous counterparts. M87 (NGC
4486) and Centaurus A (NGC 5128, CenA) are well-studied nearby LLAGNs. As an
additional feature they show gamma-radiation up to TeV (10^{12}eV) energies,
but the origin of this radiation is not resolved. The coincident observation of
a radio and TeV flare in M87 suggests that the TeV radiation is produced within
around 50-100 gravitational radii of the central supermassive black hole,
depending on the assumed value of the mass of the black hole. Strong radiation
fields can be produced in the central region of an (LL)AGN, e.g., by the
accretion flow around the black hole, the jet plasma, or stars closely orbiting
the black hole. These radiation fields can lead to the absorption of emitted
TeV photons, and in fact high optical depths of such fields can make TeV
detection from inner regions impossible. In this paper we consider the
accretion flow around the black hole as the most prominent source for such a
radiation field and we accordingly calculate the probability for absorption of
TeV photons produced near the black holes in M87 and CenA assuming a low
luminosity Shakura-Sunyaev Disk (SSD). We find that the results are very
different for between the two LLAGNs. While the inner region of M87 is
transparent for TeV radiation up to 15TeV, the optical depth in CenA is >> 1,
leading to an absorption of TeV photons that might be produced near the central
black hole. These results imply either that the TeV gamma production sites and
processes are different for both sources, or that LLAGN black holes do not
accrete (at least only) in form of a low luminosity SSD.Comment: accepted for publication in Ap