2005/11/30 by Richard Dodson, P. G. Edwards, Philip G. Edwards +2 · 1 citation
Physics and Astronomy · #Active galactic nucleus #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Brightness #Doppler effect #Galaxy #Gamma-ray bursts and supernovae #Jet (fluid) #Observatory #Physics #Proper motion #Radio Astronomy Observations and Technology #Radio galaxy #Very Long Baseline Array #Very-long-baseline interferometry #astro-ph
paper · pdf · doi:10.1093/pasj/58.2.243
To appear in PASJ VSOP special issue. Minor corrections
arxiv created 2006/03/13 · openalex publication_date 2006/04/25 · arxiv updated 2015/06/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract We have combined high resolution VLBI Space Observatory Programme (VSOP) data at 1.6 and 4.8 GHz with Very Long Baseline Array (VLBA) data at higher frequencies and with similar resolutions to study the spectral properties of the core of M 87 with milliarcsec resolution. The VSOP data allows a more accurate measurement of the turnover frequency, and hence more reliable determination of associated physical parameters of the source. Comparison of the images with previously published images yields no evidence for significant motions of components in the parsec-scale jet. In addition, the brightness temperatures obtained from modelfits to the core are well below the inverse Compton limit, suggesting that the radio emission we are observing is not strongly Doppler boosted.