Violent motions in galactic core

Article Abstract:

Powerful maser emissions have been observed from the active galaxy NGC4258 which also exhibit a high velocity relative to the motion of the nucleus of the galaxy. One possible explanation of this is that the emissions are from masers orbiting a massive central black hole. Another is that they are from energetic bipolar mass outflows from the galactic nucleus. A third is that the phenomena are not Doppler in origin but the result of Raman scattering in a dense plasma.

Research, Masers, Celestial, Astronomical masers, Radio astrophysics

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A disk of dust and molecular gas around a high-mass protostar

Article Abstract:

The presence of a flattened disk-like structure around a massive 15M protostar in the Cepheus A region, based on observations of continuum emission from the dust and line emission from the molecular gas, is presented. It is oriented perpendicular to, and spatially coincident with, the central embedded powerful bipolar radio jet, just as is the case with low-mass stars, from which it is concluded that high mass stars can form through accretion.

United States, Discovery and exploration, Stars, Cepheus (Constellation)

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Active galactic nuclei as scaled-up Galactic black holes

Article Abstract:

A study reports that the timescales can be physically linked after correcting for variations in the accretion rate and they have revealed that the accretion process is exactly same for small and large Galactic black holes. The analysis has shown that the active galactic nuclei (AGN) really are just scaled-up Galactic black holes.

Black holes (Astronomy), Astronomical research

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