Diego Altamirano

Diego Altamirano



NEW: Heartbeats of the black hole IGR J17091-3624


I am a PostDoc at the Universiteit van Amsterdam. I'm mainly focusing my studies on timing analysis of low mass X-ray binaries. Accretion onto neutron stars and black holes in such systems provide an excellent laboratory to study the physics of dense matter and strong gravity. Therefore, with the analysis I perform, I aim to understand the observational similarities and differences found among different type of sources in order to gain a better understanding of the processes that occur around these amazing  objects.


Particularly, I am interested in (a) the study of the similarities and differences found in the behavior of the noise components at low frequencies (<100 Hz) in both black hole and neutron star systems, (b) state transitions which occur very fast and are difficult to observe, (c)  a special kind of milihertz quasi-periodic oscillations which are thought to be the observational signature of marginally stable nuclear burning on the neutron star, (d) X-ray bursts, which are sudden and powerful explosions on the surface of the neutron star, (e) long term variability observed in many sources which are generally associated with the orbital period of the binary system, the possible precession period of a tilted accretion disk, accretion cycles, etc, (f) accreting millisecond X-ray pulsars: these systems are thought to be the evolutionary progenitors of recycled radio millisecond pulsars.


On the new accreting millisecond X-ray pulsar Swift J1749.4-2807