Bibcode
Orienti, M.; Dallacasa, D.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 406, Issue 1, pp. 529-534.
Fecha de publicación:
7
2010
Número de citas
9
Número de citas referidas
8
Descripción
We present a multi-epoch and multifrequency very long baseline
interferometry (VLBI) study of the compact radio source J0650+6001. In
VLBI images, the source is resolved into three components. The central
component shows a flat spectrum, suggesting the presence of the core,
while the two outer regions, with a steeper spectral index, display a
highly asymmetric flux density. The time baseline of the observations
considered to derive the source expansion covers about 15yr. During this
time interval, the distance between the two outer components has
increased by 0.28 +/- 0.13mas, that corresponds to an apparent
separation velocity of 0.39c +/- 0.18c and a kinematic age of 360 +/-
170yr. On the other hand, a multi-epoch monitoring of the separation
between the central and the southern components points out an apparent
contraction of about 0.29 +/- 0.02 mas, corresponding to an apparent
contraction velocity of 0.37c +/- 0.02c. Assuming that the radio
structure is intrinsically symmetric, the high flux density ratio
between the outer components can be explained in terms of Doppler
beaming effects where the mildly relativistic jets are separating with
an intrinsic velocity of 0.43c +/- 0.04c at an angle between 12° and
28° to the line of sight. In this context, the apparent contraction
may be interpreted as a knot in the jet that is moving towards the
southern component with an intrinsic velocity of 0.66c +/- 0.03c, and
its flux density is boosted by a Doppler factor of 2.0.
Proyectos relacionados
Centros de Galaxias a Escalas de Parsecs y Técnicas de Alta Resolución Espacial
Proyecto enfocado al estudio en el IR del núcleo de las galaxias más cercanas con resoluciones espaciales en el rango de 1 a 10 pc. Estas resoluciones espaciales, accesibles con los grandes telescopios de tierra usando técnicas frontera de observación, son por primera vez comparables a las que se obtienen rutinariamente con HST en el óptico y VLBI
Almudena
Prieto Escudero