3C84

Image
Minimum credit line: Image courtesy of NRAO/AUI (for details, see Image Use Policy).

About this Image

The nucleus of the Seyfert galaxy NGC 1275 contains 3C84, one of the brightest, compact radio sources in the sky. This image is a pseudo color representation of the 22 GHz structure of 3C84 as measured using the VLBA and one VLA antenna in October 1995. The resolution is 0.00073 by 0.00043 arcseconds, with the higher resolution in the east-west direction. The total north-south extent of the emission shown is about 0.025 arcseconds or about 26 light years. The brightest regions just north of the center are the location of on-going energy production and probably correspond to the location of a massive black hole at the center of an accretion disk. The source underwent a large increase in brightness in about 1960 and, as VLBI measurements since the mid 1970's have shown, the southern feature has been expanding ever since at an apparent rate of about half the speed of light. The northern feature was not seen until recently and is still either absent or highly attenuated at lower frequencies. The attenuation is thought to be the result of absorption of the radiation by electrons associated with the accretion disk, which, because of the orientation of the system, only occults the far side, or northern, feature. This image is from a project that has used the VLBA to image the system at many frequencies to measure this absorption as a function of position. This will give valuable information on the electron content of the accretion region.

Investigator(s):  R.C. Walker, K.I. Kellermann, V. Dhawan, J.D. Romney, J.M. Benson, R.C. Vermeulen, and W. Alef

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Technical Data

    Telescope VLBA 
    Date of Observation 1995-10-00 
    Type of Observation Continuum Observations 
    Band K 
    Wavelength 1.2 cm 
    Frequency 22 GHz 
    Center of Image RA: 03:19:48.16, Dec: 41:30:42.10 (J2000)  
    Field of View 0.0000 x 0.0000 degrees  
    Technical Caption  

  • Astronomical database entries for 3C84
    • Query NED for images of 3C84
    • Query SIMBAD for more 3C84 data

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