Ejection of Matter and Energy from NGC 4258

Abstract

It has been claimed that the megamaser observations of the nucleus of NGC 4258 show that a massive black hole is present in its center (Miyoshi et al. 1995, Greenhill et al. 1995). We show that the evidence of ejection of gas, radio plasma, and X-ray emitting QSOs from this nucleus all show that the ejection is coming from the center in a curving flow within a cone with angle ~40 degrees, centered at P.A. 100 degrees. This is close to the direction in which the velocities from the megamaser have been 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/sec and not rotating about a massive black hole. Thus it does not provide evidence for a black hole in the center. Subject headings: galaxies: nuclei: individual (NGC 4258) -- black holes -- masers

7 pages, 1 Figure, LaTex using epsf.tex, submitted to Ap.J.Letters

Cited by in corpus (7)

• A deep X-ray observation of NGC 4258 and its surrounding field
• X-ray Emitting QSOs Ejected from Arp 220
• Further Evidence for Large Intrinsic Redshifts
• QSOs Associated with Messier 82
• Distances of Quasars and Quasar-Like Galaxies: Further Evidence that QSOs may be Ejected from Active Galaxies
• A Test for the Origin of Quasar Redshifts
• The double radio source 3C343.1: A galaxy-QSO pair with very different redshifts