EJECTION OF MATTER AND ENERGY FROM NGC-4258

Citation
Em. Burbidge et G. Burbidge, EJECTION OF MATTER AND ENERGY FROM NGC-4258, The Astrophysical journal, 477(1), 1997, pp. 13-15
Citations number
22
Categorie Soggetti
Astronomy & Astrophysics
Journal title
ISSN journal
0004637X
Volume
477
Issue
1
Year of publication
1997
Part
2
Pages
13 - 15
Database
ISI
SICI code
0004-637X(1997)477:1<13:EOMAEF>2.0.ZU;2-3
Abstract
It has been claimed by Miyoshi and Greenhill that the megamaser observ ations of the nucleus of NGC 4258 show that a massive black hole is pr esent in its center. We show that the evidence of ejection of gas, rad io plasma, and X-ray-emitting QSOs from this nucleus proves that the e jection is coming from the center in a curving flow within a cone with angle similar to 40 degrees, centered at P.A. 100 degrees. This is cl ose to the direction in which the velocities from the megamaser have b een measured, so that the evidence taken as a whole suggests that the masering gas also is being ejected in the same direction at velocities +/-900 km s(-1) rather than rotating about a massive black hole. Thus the gas does not provide evidence for a black hole in the center.