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Orbital modulation and longer term variability in the radio emission from Cygnus␣X‐1

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 302:1 (1999) l1-l5

Authors:

GG Pooley, RP Fender, C Brocksopp
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No evidence for a 'redshift cut-off' for the most powerful classical double radio sources

ASTR SOC P 193 (1999) 90-93

Authors:

MJ Jarvis, S Rawlings, CJ Willott, KM Blundell, S Eales, M Lacy

Abstract:

We use three samples (3CRR, 6CE and 6C*) to investigate the radio luminosity function (RLF) for the 'most powerful' low-frequency selected radio sources. We find that the data are well fitted by a model with a constant ca-moving space density at high redshift as well as by one with a declining co-moving space density above some particular redshift. This behaviour is very similar to that inferred for steep-spectrum radio quasars by Willott et al (1998) in Line with the expectations of Unified Schemes. We conclude that there is as yet no evidence for a 'redshift cutoff' in the co-moving space densities of powerful classical double radio sources, and rule out a art-off at z less than or similar to 2.5.
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MERLIN observations of superluminal motions in GRS 1915+105

Astrophysical Letters and Communications 38:1-6 (1998) 229-232

Authors:

RP Fender, ST Garrington, DJ McKay, TWB Muxlow, GG Pooley, RE Spencer, AM Stirling, EB Waltman

Abstract:

We present a brief discussion of high resolution observations of relativistic ejections from GRS 1915+103 with MERLIN. We have imaged superluminal motions in the inner 300 milliarcsec of several ejections from the system, with significantly higher proper motions than previously observed on arcsecond scales with the VLA. Under standard assumptions of an intrinsically symmetric jet, we derive a velocity for the ejecta which is higher then the previously accepted value of 0.92c, although the angle to the line of sight is comparable. © 1999 OPA (Overseas Publishers Association) N.V Published by license under the Gordon and Breach Science Publishers imprint.

Observations of GX 339-4 in 1996

Astrophysical Letters and Communications 38:1-6 (1998) 265-268

Authors:

IA Smith, EP Liang, D Lin, M Böttcher, M Moss, A Crider, AV Filippenko, DC Leonard, RP Fender, P Durouchoux, S Corbel, R Sood

Abstract:

GX 339-4 is an unusual black hole candidate in that it is a persistent source, being detected by X-ray telescopes most of the time, but it also has nova-like flaring states. In 1996 we performed radio, optical, X-ray, and gamma-ray observations of GX 339-4 when it was in a hard state (= soft X-ray low state). Here we present a brief summary of some of the results. © 1999 OPA (Overseas Publishers Association) N.V. Published by license under the Gordon and Breach Science Publishers imprint.

X-ray spectral behavior of the relativistic jet source Cygnus X-3

Astrophysical Letters and Communications 38:1-6 (1998) 105-108

Authors:

ML McCollough, CR Robinson, SN Zhang, BA Harmon, WS Paciesas, S Dieters, S Phengchamnan, RM Hjellming, M Rupen, AJ Mioduszewski, EB Waltman, FD Ghigo, GG Pooley, RP Fender, W Cui, S Trushkin

Abstract:

Cyg X-3 is an unusual X-ray binary which shows remarkable correlative behavior between the hard X-ray, soft X-ray, and the radio. We present an analysis of these long term light curves in the context of spectral changes of the system. This analysis also incorporates a set of pointed RXTE observations made during a period when Cyg X-3 made a transition from a flaring state (including a major flare) to a quiescent radio state. © 1999 OPA (Overseas Publishers Association) N.V. Published by license under the Gordon and Breach Science Publishers imprint.