Using optical images and spectra of the bipolar nebula M 2-9 we show that, in addition to the well-known bright inner nebula, the object has fast, highly...
M1-78: a nitrogen-rich Galactic compact H II region beyond the Perseus arm
Context: There is considerable controversy surrounding the nature of M1-78, a compact nebula located beyond the Perseus arm. It was first classified as a...
Machine learning in APOGEE. Identification of stellar populations through chemical abundances
Context. The vast volume of data generated by modern astronomical surveys offers test beds for the application of machine-learning. In these exploratory...
Machine learning in APOGEE. Unsupervised spectral classification with K-means
Context. The volume of data generated by astronomical surveys is growing rapidly. Traditional analysis techniques in spectroscopy either demand intensive human...
Machine learning initialization to accelerate Stokes profile inversions
Context. At present, an exponential growth in scientific data from current and upcoming solar observatories is expected. Most of the data consist of high...
MAGIC gamma-ray and multi-frequency observations of flat spectrum radio quasar PKS 1510-089 in early 2012
Aims: Amongst more than fifty blazars detected in very high energy (VHE, E> 100 GeV) γ rays, only three belong to the subclass of flat spectrum radio quasars...
MAGIC long-term study of the distant TeV blazar PKS 1424+240 in a multiwavelength context
Aims: We present a study of the very high-energy (VHE; E> 100 GeV) γ-ray emission of the blazar PKS 1424+240 observed with the MAGIC telescopes. The primary aim...
Context. Gamma-ray bursts are cosmological sources emitting radiation from the gamma-rays to the radio band. Substantial observational efforts have been devoted...
MAGIC observations and multifrequency properties of the flat spectrum radio quasar 3C 279 in 2011
Aims: We study the multifrequency emission and spectral properties of the quasar3C 279 aimed at identifying the radiation processes taking place in the source...