Recent investigations have provided evidences that many massive (M_* > 10^{11} M_&sun;) spheroid galaxies in the early universe (z ≥ 1.5) were extremely compact (r_e ˜ 1 kpc). According to some galaxy formation theories, a fraction of these massive galaxies in the local Universe would represent surviving relics of the high-z massive galaxies. We

Aims: We have performed a comprehensive multiwavelength analysis of a sample of 20 starburst galaxies that show the presence of a substantial population of massive stars. The main aims are the study of the massive star formation and stellar populations in these galaxies, and the role that interactions with or between dwarf galaxies and/or low

We present observations and analyses of some of the most massive stars in the Milky Way, showing the potential and limits of current model atmospheres, and the consequences for the evolution theory of massive stars. We then show how these techniques can be applied to very bright stars in M31 and M33 to derive radial abundance gradients and get

Following the discovery of the gravitational-wave source GW170817 by three Laser Interferometer Gravitational-wave Observatory (LIGO)/Virgo antennae (Abbott et al., 2017a), the MASTER Global Robotic Net telescopes obtained the first image of the NGC 4993 host galaxy. An optical transient, MASTER OTJ130948.10-232253.3/SSS17a was later found, which

Review of the book: Orientaciones astronómicas en la arquitectura Maya de las Tierras Bajas by Pedro Francisco Sánchez Nava and Ivan Šprajc (Instituto Nacional de Antropología e Historia, Mexico City, 2015). Pp. 260. MXN$200. ISBN 9786074847277

The production of a { {Z}} boson, decaying to two charged leptons, in association with jets in proton-proton collisions at a centre-of-mass energy of 13 {TeV} is measured. Data recorded with the CMS detector at the LHC are used that correspond to an integrated luminosity of 2.19 {fb}^ {-1}. The cross section is measured as a function of the jet