M32 is the prototype for the relatively rare class of galaxies referred to as compact ellipticals. It has been suggested that M32 may be a tidally disturbed r1...
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PublicaciónEvidence for an Outer Disk in the Prototype ``Compact Elliptical'' Galaxy M32
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PublicaciónEvolution of the spectral curvature in the ultraluminous X-ray source Holmberg II X-1
Ultraluminous X-ray sources (ULXs) are interesting systems as they can host intermediate-mass black holes. Alternatively, ULXs can represent stellar mass black...
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PublicaciónExtremely fast orbital decay of the black hole X-ray binary Nova Muscae 1991
We present new medium-resolution spectroscopic observations of the black hole X-ray binary Nova Muscae 1991 taken with X-Shooter spectrograph installed at the 8...
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PublicaciónFailed-transition outbursts in black hole low-mass X-ray binaries
Black hole low-mass X-ray binaries (BH LMXBs) evolve in a similar way during outburst. Based on the X-ray spectrum and variability, this evolution can be...
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PublicaciónFast infrared variability from a relativistic jet in GX 339-4
We present the discovery of fast infrared/X-ray correlated variability in the black hole transient GX 339-4. The source was observed with subsecond time...
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PublicaciónFast orbital decays of black hole X-ray binaries: XTE J1118+480 and A0620-00★
We present new 10.4 m-GTC/OSIRIS spectroscopic observations of the black hole X-ray binary XTE J1118+480 that confirm the orbital period decay at dot{P}=-1.90±...
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PublicaciónFifteen years of XMM-Newton and Chandra monitoring of Sgr A★: evidence for a recent increase in the bright flaring rate
We present a study of the X-ray flaring activity of Sgr A⋆ during all the 150 XMM-Newton and Chandra observations pointed at the Milky Way centre over the last...
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PublicaciónFirst black hole mass estimation for the quadruple lensed system WGD2038-4008
Context. The quadruple lensed system WGD2038-4008 (z s = 0.777 ± 0.001) has recently been discovered with the help of new techniques and observations. Black...
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PublicaciónFundamental parameters of galactic luminous OB stars. II. A spectroscopic analysis of HDE 226868 and the mass of Cygnus X-1.
We present a spectroscopic analysis of the O9.7 Iab star HDE 226868, which is the optical counterpart of Cygnus X-1. We use this extreme supergiant to test the...