Jet and Counter-Jet emission in NGC 315


We request HSA observations at four di#erent frequencies of the giant FR I radio galaxy NGC315. The tremendous sensitivity of the HSA should allow us to obtain detailed images of the jet and counter-jet emission found in previous VLBA images. NGC 315 is one of the closest FR I radio galaxies and therefore one in which we get the best linear resolution. Moreover NGC 315 is one of the few sources where a jet acceleration has been measured in the inner 10 mas from proper motion and from the jet counter-jet brightness ratio. New data will allow a better study of the jet and counter-jet emission necessary to confirm the jet acceleration, and the trend of the jet velocity. We think that requested observations will help to determine the region of the jet in which the bulk of acceleration take places, and will allow us to discuss the jet dynamics. Moreover new observations will allow a detailed spectral index study along the jet and counter-jet to investigate radiation losses and the possible presence of regions where relativistic electrons are locally reacelerated. The presence of a di#erential jet transverse velocity should be well visible from detailed images of the jet (and counter-jet).

Name Other * Institution Email Phone
Gabriele Giovannini PI Istituto di Radioastronomia 011-51-639-9385
Luigina Feretti Istituto di Radioastronomia
Marcello Giroletti Bologna
Bill Cotton NRAO-CV 434-296-0319
Miguel Perez-Torres IAA
* PI = Principal Investigator; CO = Contact author; T = Thesis observations; S = Student

Front Ends
Gregorian C(3.95 to 5.85 GHz) Gregorian X(8.2 to 10.0 GHz) Gregorian Q(38.2 to 49.8 GHz) Gregorian K(18.0 to 26.5 GHz)

Back Ends
Mark 5 recorder (disks)

Type of Observing
Very Long Baseline Interferometry

Switching Type

Processor (correlator)

Allotted time 12.00 hours

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Updated 09/19/2007