Bibcode
Hynes, R. I.; Bradley, C. K.; Rupen, M.; Gallo, E.; Fender, R. P.; Casares, J.; Zurita, C.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 399, Issue 4, pp. 2239-2248.
Fecha de publicación:
11
2009
Número de citas
65
Número de citas referidas
61
Descripción
We present a multiwavelength study of the black hole X-ray binary V404
Cyg in quiescence, focusing upon the spectral energy distribution (SED).
Radio, optical, ultraviolet (UV) and X-ray coverage is simultaneous. We
supplement the SED with additional non-simultaneous data in the optical
through infrared where necessary. The compiled SED is the most complete
available for this, the X-ray and radio brightest quiescent black hole
system. We find no need for a substantial contribution from accretion
light from the near-UV to the near-IR, and in particular the weak UV
emission constrains published spectral models for V404 Cyg. We confirm
that no plausible companion spectrum and interstellar extinction can
fully explain the mid-IR, however, and an infrared (IR) excess from a
jet or cool disc appears to be required. The X-ray spectrum is
consistent with a Γ ~ 2 power law as found by all other studies to
date. There is no evidence for any variation in the hardness over a
range of a factor of 10 in luminosity. The radio flux is consistent with
a flat spectrum (in fν). The break frequency between a
flat and optically thin spectrum most likely occurs in the mid or
far-IR, but is not strongly constrained by these data. We find the radio
to be substantially variable but with no clear correlation with X-ray
variability.
Proyectos relacionados
![En la ilustración, inspirada en el sistema V404 Cygni, se pueden apreciar tanto la estrella compañera y el disco de acreción que rodea al agujero negro, como procesos de eyección de material en forma de jet (chorro) y viento Agujero negro en erupción](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/project/%C3%87Imagen%20TMD.jpg?h=25367c22&itok=0HYcf1S9)
Agujeros negros, estrellas de neutrones, enanas blancas y su entorno local
Los agujeros negros y estrellas de neutrones en binarias de rayos-X son laboratorios únicos para explorar la física de estos objetos compactos. No solo permiten confirmar la existencia de agujeros negros de origen estelar a través de mediciones dinámicas de sus masas, sino que también permiten investigar el comportamiento de la materia y la
Montserrat
Armas Padilla