Scintillating and Nonscintillating AGNs: Their Structure and Intergalactic Scattering

Details Scintillating and Nonscintillating AGNs: Their Structure and Intergalactic Scattering Scintillating and Nonscintillating AGNs: Their Structure and Intergalactic Scattering

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20914902l&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #149.02; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on a multi-wavelength program to examine the core structure of extremely compact AGN and to search for indications of an intergalactic medium. We have conducted Very Long Baseline Array observations of 58 compact extragalactic sources. Approximately 40% of these objects display interstellar scintillation, in the form of intraday variability, indicative of extremely compact structure ( 10 microarcseconds).
We confirm earlier, single wavelength observations that found scintillating sources to be more core-dominated than nonscintillating sources (Ojha et al. 2006, ApJS, 166, 37), consistent with expectations from their scintillation. However, scintillating and non-scintillating sources display comparable levels of radio-wave scattering ( 2 mas at 1 GHz). We also have redshifts for 63% of the sources and find no trend of scattering strength with redshift. We use these observations to place limits on the level of turbulence that the ionized intergalactic medium can support.
A companion poster (Ojha et al.) presents a summary of efforts to increase the number of sources for which redshifts have been measured.
The VLBA is a facility instrument of the National Radio Astronomy Observatory, which is operated by Associated Universities, Inc. under contract from the National Science Foundation. Basic research in radio astronomy at the NRL is supported by 6.1 Base Funding.

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