X-Ray Nova GRO J1655-40

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About this Image

A time ordered sequence of images of the microquasar GRO J1655-10, with earlier times at the top and later times underneath. This sequence covers a month in the life of the microquasar, as imaged by the VLBA. GRO J1655-40 is a binary system in which the outer envelope of the normal star is overflowing onto its black hole companion. The accreting matter swirls into a rapidly rotating disk as it falls towards the black hole; near the center, some of this matter is "squirted out" perpendicular to the disk, at relativistic speeds (i.e, speeds approaching the speed of light). The radio emission associated with these relativistic jets is what we see here. The intrinsic speed of these jets is about 90% of the speed of light. Because the jets are moving almost as fast as the radiation they emit, the approaching jet appears to move even faster, and the apparent motions range up to 1.3 times the speed of light. See http://www.astro.soton.ac.uk/~rih/j1655.html for an artist's impression of this system.

Investigator(s):  Robert Hjellming and Michael Rupen

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Technical Data

    Telescope VLBA 
    Date of Observation 1994-09-00 
    Type of Observation Continuum Observations 
    Band L 
    Wavelength 20 cm 
    Frequency 1.4 GHz 
    Center of Image RA: 16:54:0.14, Dec: -39:50:44.90 (J2000)  
    Field of View 0.0008 x 0.0001 degrees  
    Technical Caption VLBA images at 1.6 GHz. Images made from data collected in August and September, 1994. Top image from Aug 18-19; next one from Aug 22-23; next Aug 25-26; next Aug 25-26; next Sep 1-2; next Sep 8-9; next Sep 12-13; and last Sep 20-21.  

  • Astronomical database entries for GRO J1655-40
    • Query SIMBAD for more GRO J1655-40 data


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