radio and x-rays from grs1915+105

Radio and X-rays from GRS1915+105

- Close Correlations of the Third Kind

Ralph Spencer and Tony RushtonJBCA, The University of

Manchester

Alien!

PlateauLow/hard X-ray“C” state

FlaringSoftHigh or IntermediateState23 mas/day

10 years of monitoring

Date X-ray flare(MJD)

Motion mas/day

1998June09

50967 27±3

2003Mar06 52694 18 ±2

2003Apr18 52733 16.5 ±1

2003June15

52788 or52792

17.5 ±123.5 ±1

14 Merlin runs - 4 have extended jets following an X-ray flare

See Rushton et al MNRAS 2010

1996 2006

Hardness

X-ray counts

Ryle radio

1999 2005

Rushton et al 2010 in prep.

Summary• Type 1:

• Relativistic jets ejected following a state change and X-ray flare – related to disc formation and evolution

• Apparent velocity varies – angle change?

• Type 2:• Close correlation with X-rays in plateau state: strong

coupling between accretion (ADAF) and radio strength (unlikely) or X-rays from same electrons (synchrotron?)

• Type 3• Long term (~1 yr) cyclic behaviour – thermal

timescale of equatorial disc? Magnetic dynamo timescale of companion? Synodic variations due to a 3rd body? Mystery!

Questions ?