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New GTC Spectroscopic Data and a Statistical Study to Better Constrain the Redshift of the BL Lac RGB J2243+203
D. Rosa González, H. Muriel, Y. D. Mayya +13
We present new spectroscopic data of the BL Lac RGB 2243+203, and its surroundings, obtained with the OSIRIS Multi Object Spectrograph (MOS) mounted in the Gran Telescopio Canarias…
From Giant H II regions and H II galaxies to globular clusters and compact dwarf ellipticals
Elena Terlevich, David Fernández-Arenas, Roberto Terlevich +3
Massive starforming regions like Giant HII Regions (GHIIR) and HII Galaxies (HIIG) are emission line systems ionized by compact young massive star clusters (YMC) with masses rangin…
Primordial helium abundance determination using sulphur as metallicity tracer
Vital Fernández, Elena Terlevich, Angeles I. Díaz +2
The primordial helium abundance is calculated using sulphur as metallicity tracer in the classical methodology (with as an extrapolation of to zero metals). The cal…