Optical and high-energy monitoring of variable sources observed with INTEGRAL/OMC
Author
Alfonso Garzón, JuliaAdvisor
Mas Hesse, José MiguelEntity
UAM. Departamento de Física Teórica; Centro de Astrobiología (CAB)Date
2015-05-11Subjects
Astrofísica - Aparatos e instrumentos - Tesis doctorales; FísicaNote
Tesis doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Física Teórica. Fecha de la lectura: 11-05-2015Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
Since the discovery of the first variable stars in the 16th century, their study has been one of
the principal areas of astronomical research. During the 20th century and the beginning of the
21st, many optical photometric surveys have been carried out with the aim of understanding
the physical mechanisms producing the observed variations of brightness. With the discovery of
the first X-ray sources in the sky in the 60’s and the development of X-ray astronomy, several
X-ray observatories have been launched into space in order to study the properties of these
X-ray sources at higher energies. Multiwavelength analyses are required for a better knowledge
of these systems. For this reason, an optical monitoring camera was included on the X- and
gamma-ray space observatory INTEGRAL of the European Space Agency (ESA).
In this thesis, the main results of the analysis of the optical photometric data obtained with
the optical monitoring camera (OMC) on board INTEGRAL are presented. The major goal
of this work was to classify the thousands of light curves obtained and to identify and study
relevant scientific cases extracted from the large sample of data.
In its 12 years of operations, OMC has observed a very large amount of classical variable
sources, including pulsating stars, eclipsing binaries, rotating stars, AGN, etc. The compilation
of the first catalog of optically variable sources observed by OMC, including information on their
brightness, variability, periodicity, and object type classification, is presented.
Within the sources in this catalog, a search for eclipsing binaries with one pulsating component
has been carried out. One of the identified systems, DY Aqr, has been studied in detail.
On the other hand, apart from these serendipitous observations, OMC was designed to
provide optical monitoring of the sources observed by the main X- and gamma-ray instruments
IBIS and JEM-X on board INTEGRAL. For the first time, simultaneous observations of the
optical and X- and gamma-ray sky over more than 12 years are presented. In this thesis,
two different works including multiwavelength information provided by INTEGRAL have been
performed.
In the first one the global properties of the emission of high-energy sources in different energy
bands (hard X-rays, optical, IR, and MIR) have been studied. The emission from the different
types of objects has been compared, looking for similarities and differences that could reveal
information about the nature of their powerful sources.
The second one consists of a multiwavelength long-term variability analysis, using light
curves of the INTEGRAL instruments IBIS, JEM-X, and OMC, as well as from other highenergy
missions and optical surveys, with a temporal coverage of more than 12 years
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