Search for Free-Free Absorption Cutoffs from Tori in Three Type 2 Active Galactic Nuclei | Zendy

Richard Barvainis | Zendy; C. J. Lonsdale | Zendy

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Search for Free-Free Absorption Cutoffs from Tori in Three Type 2 Active Galactic Nuclei

Author(s) -

Richard Barvainis,

C. J. Lonsdale

Publication year - 1998

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/300262

Subject(s) - very long baseline interferometry , active galactic nucleus , physics , astrophysics , torus , cutoff , absorption (acoustics) , very long baseline array , type (biology) , astronomy , optics , galaxy , geometry , geology , mathematics , quantum mechanics , paleontology

We have observed three Type 2 radio loud active galactic nuclei using theVLBA at five frequencies between 1.6 GHz and 15 GHz, in a search for thefree-free absorption cutoff predicted by some models for optically-obscuringdusty molecular tori. We find no evidence for sharp cutoffs toward lowfrequencies in any of the sources. However, one source, OW637, has VLBIcomponents which are steeply falling toward high frequencies (S_nu \proptonu^-2).Comment: 7 pages, Latex, using aaspp4.sty (included), plus 4 ps figures to be printed out separately. Accepted for publication in the A

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