NRAO: National Radio Astronomy Observatory

About this Image

This image shows the radio emission from relativistic streams of high energy particles generated by the quasar. This is a classic double-lobed radio source. Astronomers believe that the jets are fueled by material accreting onto a super-massive black hole at the center of the host galaxy (not shown in this image). The high energy particles are confined to remarkably well collimated jets, and are shot into extragalactic space at speeds approaching the speed of light, where they eventually balloon into massive radio lobes. The overall linear size is of the radio structure is 212 kpc (for a Hubble constant of 100 km/s/Mpc), which can be compared to a typical galaxy diameter of about 30 kpc. The quasar has double lobes with prominent hot spots, and has a narrow jet, but no counter-jet. Its possible that we only see the jet that is pointing toward us, which may be "Doppler boosted" in brightness when the particles emitting the radio radiation are moving toward us at close to the speed of light. The counter-jet would be moving away from us, and would thus not experience Doppler boosting. The jet brightens and bends as it enters its lobe.

Investigator(s):  Alan Bridle, David Hough, Colin Lonsdale, Jack Burns and Robert Laing

Alternate Resolutions

Help

This image is available in the following downloadable versions:

• 537 x 356 color GIF

If you would like to obtain a higher resolution version of this image, please contact Pat Smiley.

For More Information

• Read the Journal article
• Visit related website http://www.cv.nrao.edu/~abridle/3c175.htm
• Up one level for more info on Quasars
• For unfamiliar terms, visit the NRAO Radio Astronomy Glossary

Technical Data

Telescope	VLA
Date of Observation	1986-03-29
Type of Observation	Continuum Observations
Band	C
Wavelength	6 cm
Frequency	5.0 GHz
Center of Image	RA: 07:13:2.40, Dec: 11:46:14.60
Field of View	0.0200 x 0.0100 degrees
Technical Caption	This quasar is at a redshift of z=0.768. VLA 4.9 GHz image at 0.35 arcsec resolution



Astronomical database entries for 3C175
• Query NED for images of 3C175
• Query SIMBAD for more 3C175 data

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