Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-04-28
Astronomy and Astrophysics
Astrophysics
Accepted for publication in PASP (July 1999), 17 pages, including 4 Postscript figures
Scientific paper
10.1086/316394
We present X-ray (ROSAT), infrared, and radio observations of NGC 4395, which harbors the optically least luminous type 1 Seyfert nucleus discovered thus far. In combination with published optical and ultraviolet spectra, we have used these data to assemble the broadband spectral energy distribution (SED) of the galaxy's nucleus. Interestingly, the SED of NGC 4395 differs markedly from the SEDs of both quasars and typical low-luminosity active galactic nuclei, which may be a manifestation of the different physical conditions (i.e., black hole masses, accretion rates, and/or accretion modes) that exist in these objects. The nuclear X-ray source in NGC 4395 is variable and has an observed luminosity of just ~ 10^38 ergs/s. Although this emission could plausibly be associated with either a weak active nucleus or a bright stellar-mass binary system, the optical and ultraviolet emission-line properties of the nucleus strongly suggest that the X-rays arise from a classical AGN.
Belloni Tomaso
Comastri Andrea
Filippenko Alexei V.
Ho Luis C.
Moran Edward C.
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