Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20914903w&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #149.03; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
The Seyfert 1 nucleus of NGC4395 is energized by a black hole of mass 3.6e5 Solar masses (Peterson et al. 2005), making it one of only two nuclear black holes of intermediate mass, 1e3 1e6 Solar masses, detected in the radio regime. Building upon UV and X-ray evidence for outflows from this Seyfert nucleus, the VLBI High Sensitivity Array (HSA) was used at 1.4 GHz to search for extended structure on scales greater than 5 mas (0.1 pc). Elongated emission was discovered, extending over 15 mas (0.3 pc) and suggesting an outflow on subparsec scales from this intermediate-mass black hole. The Seyfert nucleus is located at the center of an elliptical star cluster, and the elongation position angle of the subparsec radio structure is only 19 degrees from the star cluster's minor axis.
For details, please see Wrobel & Ho (2006, ApJ, 646, L95).
These HSA observations involved the VLBA, the VLA, and the GBT, which are operated by the NRAO. The NRAO is a facility of the NSF operated under cooperative agreement by AUI.
Ho Luis C.
Wrobel Joan M.
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