The improvement on the Imaging Air Cherenkov Technique led to the discovery of a new class of compact binaries: the gamma-ray binaries. This small class consist...
The NIR counterpart to XTE J1747-274(=IGR J17473-2721)
We report follow-up observations confirming the near-infrared (NIR) counterpart to the X-ray transient XTE J1747-274/IGR J17473-2721 (ATEL #467, #498). A Ks=16...
The omnipresent flux-dependent optical dips of the black hole transient Swift J1357.2−0933
Swift J1357.2-0933 is a black hole transient that is of particular interest due to the optical recurrent dips found during its first two outbursts (in 2011 and...
We report the counterpart to the X-ray transient and black hole candidate XTE J1817-330 (ATEL #714). Our observations consist of a series of 5s and 10s g'-band...
The orbital period, black hole mass, and distance to the X-ray transient GRS 1716-249 ( =N Oph 93)
We present evidence for a 0.278(8) d ( =6.7 h) orbital period in the X-ray transient GRS 1716-249 (=N Oph 93), based on a superhump modulation detected during...
The outburst of a neutron star reveals the nature of phenomena only observed in black holes
An international scientific team led by the Instituto de Astrofísica de Canarias (IAC) found a neutron star that captures matter from a companion star with a...
We introduce the strong CP problem and the existence of the Axion as a possible solution. We discuss the possibility that axions are the dark matter of the...
The role of massive black hole recoil in galaxy evolution
The coalescence of a massive black hole (MBH) binary leads to the gravitational-wave recoil of the system and its ejection from the galaxy core. We have carried...
The Square Kilometre Array: At the Frontiers of Astronomy, Physics, and Astrobiology
The Square Kilometre Array is intended to be the centimeter- and meter-wavelength telescope for the 21st Century. Originally proposed as the "hydrogen telescope...