TY - JOUR
T1 - VLBI constraints on the “Jet-line” of Cygnus X-1
AU - Rushton, Anthony
AU - Miller-Jones, James
AU - Paragi, Zsolt
AU - Maccarone, Thomas
AU - Pooley, Guy
AU - Tudose, Valeriu
AU - Fender, Rob
AU - Spencer, Ralph
AU - Dhawan, Vivek
AU - Garrett, Michael
N1 - Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.
PY - 2010
Y1 - 2010
N2 - Results are presented from recent VLBI observations of Cygnus X-1 during X-ray spectral state changes. Using the EVN in e-VLBI mode and the VLBA with disk recording, we observed the X-ray binary at very high angular resolution and studied changes in the compact jets as the source made transitions from hard X-ray states to softer states. The radio light curves show that these transitions were accompanied by radio flaring events followed by a quenching of the radio emission, as expected from the current paradigm for disc-jet coupling in X-ray binaries. While we see structural changes in the compact jets during these transitions, there was no evidence for the expected ejection of bright, relativistically-moving jet knots. However, we find strong evidence that the jet does not switch off completely in the soft X-ray state of Cygnus X-1, such that a weak, compact jet persists during this phase of radio quenching.
AB - Results are presented from recent VLBI observations of Cygnus X-1 during X-ray spectral state changes. Using the EVN in e-VLBI mode and the VLBA with disk recording, we observed the X-ray binary at very high angular resolution and studied changes in the compact jets as the source made transitions from hard X-ray states to softer states. The radio light curves show that these transitions were accompanied by radio flaring events followed by a quenching of the radio emission, as expected from the current paradigm for disc-jet coupling in X-ray binaries. While we see structural changes in the compact jets during these transitions, there was no evidence for the expected ejection of bright, relativistically-moving jet knots. However, we find strong evidence that the jet does not switch off completely in the soft X-ray state of Cygnus X-1, such that a weak, compact jet persists during this phase of radio quenching.
UR - http://www.scopus.com/inward/record.url?scp=85053724191&partnerID=8YFLogxK
M3 - Conference article
AN - SCOPUS:85053724191
SN - 1824-8039
VL - 125
JO - Proceedings of Science
JF - Proceedings of Science
T2 - 10th European VLBI Network Symposium and EVN Users Meeting: VLBI and the New Generation of Radio Arrays, EVN Symposium 2010
Y2 - 20 September 2010 through 24 September 2010
ER -