Intermediate-Mass Black Hole in NGC 4395

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About this Image

The Seyfert 1 nucleus of NGC 4395 is energized by a black hole of mass 3.6e5 Solar masses, making it one of only two nuclear black holes of intermediate mass, about 1e3 to 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 milliarcseconds (0.1 parsecs). Elongated emission was discovered, extending over 15 milliarcseconds (0.3 parsecs) 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 clusters's minor axis.

Investigator(s):  J.M. Wrobel and L.C. Ho

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Technical Data

    Telescope other 
    Date of Observation 2005-05-01 
    Type of Observation Continuum Observations 
    Band L 
    Wavelength 20 cm 
    Frequency 1.4 GHz 
    Center of Image RA: 12:25:48.88, Dec: 33:32:48.70 (J2000)  
    Field of View 0.0000 x 0.0000 degrees  

  • Astronomical database entries for NGC 4395
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    • Query SIMBAD for more NGC 4395 data


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