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vlbi proper motions observed
Statement DescriptionVery long baseline interferometry observations show that the ends of the sources are moving outwards through the galactic interstellar medium at velocities of about 10% of the speed of light. Reference An & Baan 2012 http://adsabs.harvard.edu/abs/2012ApJ...760...77A
Topic:GPS/CSO radio sources are the progenitors of the large scale radio sources
Statement DescriptionGPS/CSO are small radio sources in the nuclei of galaxies. They are thought to grow into large radio sources which extend beyond their host galaxies into the intergalactic medium. There is some evidence that at least some of these sources are not going to become large radio sources.
Topic:the gps cso sources must have sufficient velocity
Statement DescriptionWe assume that if the GPS CSO radio sources are expanding fast enough that they will reach a size of at least 10 kpc in less than one million years, then they can be considered to be the progenitors of the large scale sources.
Topic:vlbi proper motions are consistent with expansion
Statement Descriptionvlbi proper motions show expansion at velocities of about 0.1 c
Topic:too many gps cso sources
Statement DescriptionThere seem to be too many gps cso sources relative to the extrapolation of the relation between size and number seen at larger sizes. This sugests that not all of them can evolve to become large sources, perhaps because they are trapped on small scales by dense environments or perhaps their lifetimes are short. Or perhaps they are intrinsically weak interlopers which are brightened to the observed radio fluxes by confinement.
Topic:gps cso found in star forming environments
Statement Descriptionwork by tadhunter and collaborators shows that gps sources are found associated with star forming regions much more frequently than large scale radio sources. this would be consistent with sources in star forming regions being boosted in radio flux density because they are confined by the dense star forming gas.
Topic:GPS CSO live long enough to become large sources
Statement DescriptionWe assume that the GPS and CSO sources have lifetimes of at least 1 million years.
Topic:Arguments in Favor
Topic:Arguments in Favor
Topic:vlbi propermotions are consistent with expansion
Topic:Arguments against
Topic:This person is not following anyone.