Intermediate-Mass Black Hole in NGC 4395

https://www.nrao.edu/archives/plugins/Dropbox/files/ngc4395_hi.jpg

Description

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.

Creator

Legacy Astronomical Images

Rights

NRAO/AUI/NSF does not hold full copyright for this image. Contact the archivist for details.

Type

Legacy Astronomical Image

Object Name

NGC 4395

Investigators

J.M. Wrobel, L.C. Ho

Telescope

Very Long Baseline Array (VLBA)
Very Large Array
Green Bank Telescope (GBT)

Observation Date

2005-05-01

Type of Observation

continuum

Band

L

Wavelength

20 cm

Frequency

1.4 GHz

Center of Image

RA 12:25:48.880, Dec: 33:32:48.700 (J2000)

Field of View

0.000019 x 0.000019 degrees

Link to journal article

Notes

Contact the archivist for a high resolution tif of this image.

Series

Active Galactic Nuclei Series

Unit

Seyferts Unit

Citation

Legacy Astronomical Images, “Intermediate-Mass Black Hole in NGC 4395,” NRAO/AUI Archives, accessed March 29, 2024, https://www.nrao.edu/archives/items/show/33395.