A Double Lobe Radio Galaxy Between Clusters: Constraints on the Intrafilament Medium Density

Details A Double Lobe Radio Galaxy Between Clusters: Constraints on the Intrafilament Medium Density A Double Lobe Radio Galaxy Between Clusters: Constraints on the Intrafilament Medium Density

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21712702e&link_type=abstract

American Astronomical Society, AAS Meeting #217, #127.02; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We have found the first bent double lobe radio source (DLRS) in a known cluster filament. This discovery has enabled us to constrain the intrafilament density (IFM) to be between (1-10)x10-29 gm/cm3. The host filament has been observed using extensive multiwavelength photometry and confirmed with hundreds of member redshifts. It stretches from the rich galaxy cluster Abell 1763 to the nearby cluster Abell 1770, 13Mpc away. Our recent observations from the VLA uncovered the DLRS at a distance of 3.4Mpc from the center of Abell 1763, well outside the virial radius of either cluster. We measure the jet flux and calculate the minimum pressure in the jet. Using geometric arguments to derive the orientation and bend of the jet, and assuming that the bend of the of the jet is due to ram pressure, we are able to constraint the density of the IFM. Our measurements agree with the small number of IFM estimates that currently exist, including results from different approaches such as the direct X-ray observations of Abell 222/223 and related WHIM measurements in Sculptor, as well as theoretical models. Our findings justify future searches for bent double lobe radio sources located several Mpc from cluster cores, as they may be good markers of super cluster filaments.

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