Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1010...23m&link_type=abstract
A POPULATION EXPLOSION: The Nature & Evolution of X-ray Binaries in Diverse Environments. AIP Conference Proceedings, Volume 10
Astronomy and Astrophysics
Astronomy
3
Interactions Of Particles And Radiation With Matter, Neutron Stars, X-Ray Binaries, Astronomical And Space-Research Instrumentation
Scientific paper
We present new results from a multi-wavelength project aiming to assess the jet properties in neutron star X-ray binaries. Recently, the Spitzer Space Telescope opened a new observational window in the studies of jets from low-luminosity neutron star (NS) X-ray binaries (XRBs). Observations of the NS ultracompact XRB 4U 0614+091 with IRAC revealed the first spectral evidence for a compact jet in a low-luminosity NS XRB. I will present the results from the follow-up multi-wavelength observations of 4U 0614+091. We observed the source in the radio band (VLA), mid-IR/IR (Spitzer/MIPS and IRAC), near-IR (SMARTS), optical-UV (Swift/UVOT), soft and hard X-rays (Swift/XRT and RXTE)-the best coverage of a NS XRB to date. We detect the source in the whole range-for the first time in the radio band and at 24 μm-giving the first simultaneous measurement of the `break', the optically thick and the optically thin part of the spectrum of the compact jet. These observations allow us an estimate of the total jet power and, thanks to the contemporaneous X-ray observations, of the fraction of the accreted power channeled into the jet. Furthermore, we discuss the jet/accretion coupling in NS systems, reporting on recent strictly-simultaneous radio/X-ray observations of the highly-accreting NS XRB GX 17+2. We show evidence for an association between the formation of a jet and an X-ray state transition, and discuss the possible relations between the radio emission and the hard X-ray tails.
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