|ABOUT ME||CV||RESEARCH||JOURNAL CLUB||INTERESTS|
SS433 and Microquasars
Microquasars are extraordinary objects that undergo the most extreme process in the Universe: accretion onto a Black Hole.
The microquasar SS433 is probably the most exotic object
in our Galaxy. Along with its natural ability to puzzle
astronomers and physicists, it shows wondrous properties
such as: accretion flows, presence of a black-hole (or
neutron star), accretion and excretion discs, precession,
nutation and orbital periodicities, emission all over the
spectrum and, most importantly, ejection of corkscrew jets
of baryonic matter, everything enclosed in a really
intriguing binary system surrounded by a huge supernova
Well, SS433 is the main topic of my Ph.D. thesis. My goals are mainly to study the companion star and the accretion processes going on in the system, by using infra-red telescopes in order to "see" further in the outflowing material, thus avoiding the huge amount of interstellar dust in between SS433 and us.
SS433's circumbinary ring and accretion disc viewed through its attenuating disc wind
Perez, Sebastian and Blundell, K. M., 2010, accepted for publication in MNRAS
Inflow and outflow from the accretion disc of the microquasar SS433: UKIRT spectroscopy
Perez, Sebastian and Blundell, K. M. 2009, MNRAS, 397, 849
Active/Starburst Galaxies Dichotomy: NGC4438
Active galaxies, meaning galaxies hosting a supermassive
black-hole in their nuclei, are of extreme importance to
galaxy formation and cosmology. Actually, it is their
input into the intergalactic medium what matters. Impact
of outflows driven by radiation from these "supermassive"
black-holes are thought to hit (and heat up) the gas in
between the galaxies, this should be enough to prevent the
gas from condensing (cool down) and forming more
galaxies. Can microquasars alter this picture?
I studied the severely damaged galaxy NGC4438 located in the very centre of the Virgo Cluster. It is not clear whether this galaxy harbours a supermassive black-hole or not. The other possibility may be a great amount of starburst in the core, hence the AGN/Starburst dichotomy. I began working on this project as an undergraduate in the summer of 2004, working with Dr. Simon Casassus.
Near-infrared imaging and spectroscopy of the nuclear region of the disturbed Virgo cluster spiral NGC4438
Perez, Sebastian, Casassus, S., Cortes, J. R. and Kenney, J. D. 2009, MNRAS, 400, 2098
I am also interested in:
Astrobiology is the study of the living universe. But, what is life? Chyba and Carol Cleland (philosopher) argue that the idea that one can answer the question "what is life?" by defining life is mistaken, resting on confusions about the nature of definition and its ability to answer fundamental questions about the natural world. Astrobiology studies the "life as we know it", meaning life based on liquid water, carbon, and a usable source of energy. Because carbon-based molecules and useful sources of energy are common throughout the solar system, the search for life in the solar system came to emphasize the search for liquid water. Life is dependent on liquid water because it requires an internal medium within which molecules may dissolve and chemical reactions occur (water is called the universal solvent).