1999/01/11 by D. E. Harris, J. Hjorth, A. C. Sadun +2 · 1 citation
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #Gamma-ray bursts and supernovae #astro-ph
paper · pdf · doi:10.1086/307284
published as Astrophys.J. 518 (1999) 213-218 · 6 pages latex plus 3 ps/eps figures. Uses 10pt.sty and emulateapj.sty. Accepted for publication in the ApJ (6 Jan 99)
arxiv created 1999/01/11 · openalex publication_date 1999/06/10 · arxiv updated 2009/12/01 · openalex created_date 2020/11/23 · openalex updated_date 2026/07/31
We report the discovery of X-ray emission from a radio knot at a projected distance of 25'' from the nucleus of the Seyfert galaxy 3C 120. The data were obtained with the ROSAT HRI. Optical upper limits for the knot preclude a simple power-law extension of the radio spectrum, and we calculate some of the physical parameters for thermal bremsstrahlung and synchrotron self-Compton models. We conclude that no simple model is consistent with the data, but if the knot contains small regions with flat spectra, these could produce the observed X-rays (via synchrotron emission) without being detected at other wave bands.