The first resolved imaging of milliarcsecond-scale jets in Circinus X-1
| Autor: | Jamie McCallum, Steven Tingay, G. D. Nicolson, Christopher S. Reynolds, Chris Phillips, Anastasios Tzioumis, Rob Fender, A. Moin, Valeriu Tudose, James Miller-Jones |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Physics
Jet (fluid) Proper motion Astrophysics::High Energy Astrophysical Phenomena Binary number Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Position angle law.invention Telescope Neutron star Lorentz factor symbols.namesake Space and Planetary Science law symbols Circinus Astrophysics::Galaxy Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society: Letters. 419:L49-L53 |
| ISSN: | 1745-3925 |
| DOI: | 10.1111/j.1745-3933.2011.01176.x |
| Popis: | We present the first resolved imaging of the milliarcsecond-scale jets in the neutron star X-ray binary Circinus X-1, made using the Australian Long Baseline Array. The angular extent of the resolved jets is ~20 milliarcseconds, corresponding to a physical scale of ~150 au at the assumed distance of 7.8 kpc. The jet position angle is relatively consistent with previous arcsecond-scale imaging with the Australia Telescope Compact Array. The radio emission is symmetric about the peak, and is unresolved along the minor axis, constraining the opening angle to be less than 20 degrees. We observe evidence for outward motion of the components between the two halves of the observation. Constraints on the proper motion of the radio-emitting components suggest that they are only mildly relativistic, although we cannot definitively rule out the presence of the unseen, ultra-relativistic (Lorentz factor >15) flow previously inferred to exist in this system. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text