Crater II is the fourth largest galaxy among the satellites of the Milky Way, only surpassed by the Magellanic Clouds, Sagittarius and the recently discovered...
The Ultraluminous X-ray Source IC 342 X-1 and its Environment
We present optical observations of a ULX in the nearby spiral galaxy IC 342. This variable source has an average X-ray luminosity of some 10^{40} erg/s. At the...
The Ultraluminous X-ray Source in Holmberg IX and its Environment
We present optical observations of an ultraluminous X-ray source (ULX) in Holmberg IX, a dwarf galaxy near M81. The ULX has an average X-ray luminosity of some...
The Ultraviolet Filter Imager (SuFI) onboard the Sunrise balloon-borne solar observatory: Instrument description and first results
We describe the design of the near UV filter imager SuFi onboard Sunrise, which was successfully flown in the stratosphere in June 2009. During its five days...
The ultraviolet researcher to investigate the emergence of life: a mission proposal to ESA's F-call
The mission Ultraviolet Researcher to Investigate the Emergence of Life (URIEL) is designed to carry out low dispersion (600-1,000) UV spectropolarimetry in the...
The ULX NGC 1313 X-2: an Optical Study Revealing an Interesting Behavior
We present a summary of our ongoing efforts to study one of the brightest ultraluminous X-ray source, NGC 1313 X-2. Despite a large coverage in the X-rays, much...
The Undiscovered Ultra Diffuse galaxies of the Local Group: predictions from constrained cosmological simulations
Ultra-diffuse galaxies (UDGs) are attractive candidates to probe cosmological models and test theories of galaxy formation at low masses; however, they are...