The host of B2 0828+32, a radio galaxy with two sets of radio lobes.

Details The host of B2 0828+32, a radio galaxy with two sets of radio lobes. The host of B2 0828+32, a radio galaxy with two sets of radio lobes.

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...313..750u&link_type=abstract

Astronomy and Astrophysics, v.313, p.750-754

Astronomy and Astrophysics

Astrophysics

10

Galaxies: B2 0828+32, Elliptical, Radio Continuum: Galaxies

Scientific paper

B2 0828+32 is one of the few radio galaxies with two double lobe radio structures of different ages and oriented at widely different angles, indicating that the direction of the radio jet has changed with time. Recent spectral index maps set an age for the particles in the old lobes of 70Myears which is therefore also the maximum age of the young lobes. This sets a constraint on the time scale of the phenomenon which caused the change of radio axis direction. We have obtained deep CCD images, in V and R, of the host galaxy of B2 0828+32 in a search for signatures of a recent merger event. We find that the galaxy shows a regular morphology with no signs of a recent major merger. It has no double core or companion brighter than M_V_=-16.7, within 38kpc. This is in contrast with the best known radio galaxies of this type, 3C 315 and B2 0055+26, which both belong to a close pair of ellipticals. The luminosity profile follows the de Vaucouleurs r^1/4^ profile with some discrepancy at radii less than ~15arcsec which could be a weak sign of a merger <~10^8^years ago. We consider the scenario where the radio source is powered by a rotating black hole and the radio axis is aligned along the spin axis of the black hole. We discuss the case where the change of the radio axis direction was caused by accretion by the black hole following a merger event. The direction of the radio axis is changed when the accreted material arrives at the black hole with an angular momentum axis very different from the spin axis of the black hole and is at least equal to the initial black hole mass. The minimum mass doubling time of a black hole corresponds to the Eddington accretion rate and is t ~31Myears (independent of the mass). The maximum age of the young lobes, 70Myears, constrains the accretion rate to be of the order of the Eddington rate. The present luminosity of the radio galaxy is much below the Eddington luminosity of even a small 10^6^Msun_ black hole, suggesting that the fuel is now exhausted.

Affiliated with

Also associated with

No associations

Rating

The host of B2 0828+32, a radio galaxy with two sets of radio lobes. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The host of B2 0828+32, a radio galaxy with two sets of radio lobes., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The host of B2 0828+32, a radio galaxy with two sets of radio lobes. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1455861