Francisco Förster

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Theoretical models predict that the initial metallicity of the progenitor of a Type Ia supernova (SN Ia) affects the peak of the supernova light curve. This can cause a deviation from the standard light curve calibration employed when using SNe Ia as standardizable distance candles and, if there is a systematic evolution of the metallic-ity of SN Ia(More)
We study the radial distribution of supernova Ia (SNe Ia) in morphologically selected early–type host galaxies from the Sloan Digital Sky Survey (SDSS) and discuss its implications for the progenitor systems of SNe Ia. While new observations of early-type galaxies suggest that they contain small fractions of young stellar populations, they are also the most(More)
We reassess the question of a systematic time delay between the formation of the progenitor and its explosion in a type Ia supernova (SN Ia) using the Hubble Higher-z Supernova Search sample (Strolger et al. 2004). While the previous analysis indicated a significant time delay, with a most likely value of 3.4 Gyr, effectively ruling out all previously(More)
The spectral energy distribution of the dark cloud LDN 1622, as measured by Finkbeiner using WMAP data, drops above 30 GHz and is suggestive of a Boltzmann cutoff in grain rotation frequencies, characteristic of spinning dust emission. LDN 1622 is conspicuous in the 31 GHz image we obtained with the Cosmic Background Imager, which is the first cm-wave(More)
Journal Articles 138 " Multiple images of a highly magnified supernova formed by an early-type cluster galaxy lens, " 136 " Comprehensive observations of the bright and energetic Type Iax SN 2012Z: Interpretation as a Chandrasekhar mass white dwarf explosion, " M. 135 " Extensive HST ultraviolet spectra and multiwavelength observations of SN 2014J in M82(More)
Basallaminae of Schwanncell ensheathed axons and "naked" axons respectively have contact areas between the endformation of the peripheral vegetative nervious system and gröundsubstance. The latter, however, merges directly in the glycocalyces of connective tissue cells and organ cells. These cells may be related to one another (i.e. microvilli, cell(More)
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