VLBA CONTINUUM OBSERVATIONS OF NGC-4258 - CONSTRAINTS ON AN ADVECTION-DOMINATED ACCRETION FLOW

Authors
HERRNSTEIN JR GREENHILL LJ MORAN JM DIAMOND PJ INOUE M NAKAI N MIYOSHI M
Citation
Jr. Herrnstein et al., VLBA CONTINUUM OBSERVATIONS OF NGC-4258 - CONSTRAINTS ON AN ADVECTION-DOMINATED ACCRETION FLOW, The Astrophysical journal, 497(2), 1998, pp. 69-73
Citations number
27
Categorie Soggetti
Astronomy & Astrophysics
Journal title
The Astrophysical journal → ACNP
ISSN journal
0004637X
Volume
497
Issue
2
Year of publication
1998
Part
2
Pages
69 - 73
Database
ISI
SICI code
0004-637X(1998)497:2<69:VCOON->2.0.ZU;2-P
Abstract
We report a 3 sigma upper limit of 220 mu Jy on any 22 GHz continuum e mission coincident with the central engine in NGC 4258. If NGC 4258 is powered by an advection-dominated accretion flow, this radio upper li mit implies that the inner advection-dominated flow cannot extend sign ificantly beyond similar to 10(2) Schwarzschild radii.