IAR   05382
INSTITUTO ARGENTINO DE RADIOASTRONOMIA
Unidad Ejecutora - UE
artículos
Título:
Runaway stars as cosmic ray injectors inside molecular clouds
Autor/es:
M.V. DEL VALLE; G.E. ROMERO; R. SANTOS-LIMA
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2015
ISSN:
0035-8711
Resumen:
Giant molecular clouds (GMCs) are a new population of gamma-ray sources,
being the target of cosmic rays (CRs) - locally accelerated or not.
These clouds host very young stellar clusters where massive star
formation takes place. Eventually, some of the stars are ejected from
the clusters, becoming runaway stars. These stars move supersonically
through the cloud and develop bowshocks where particles can be
accelerated up to relativistic energies. As a result, the bowshocks
present non-thermal emission, and inject relativistic protons in the
cloud. These protons diffuse in the GMC interacting with the matter. We
present a model for the non-thermal radiation generated by protons and
secondary pairs accelerated in the bowshocks of massive runaway stars
within young GMCs. We solve the transport equation for primary protons
and secondary pairs as the stars move through the cloud. We present
non-thermal emissivity maps in radio and in gamma-rays as a function of
time. We obtain X-ray luminosities of the order of
?1032 erg s-1 and gamma-ray luminosities
?1034 erg s-1. We conclude that, under some
assumptions, relativistic protons from massive runaway stars interacting
with matter in GMCs give rise to extended non-thermal sources.