R. Zylka

Sgr A* — A Starving Black Hole?

The Galactic Center was actually the first radio source identified after Carl Guthe Jansky’s discovery of cosmic radio radiation in 1933. At the long wavelength of λ 14.5 m Jansky nearly exclusively observed only synchrotron emission. Although the contribution of free-free emission becomes stronger at decimeter wavelengths, in later surveys with 25 m telescopes at λ 20 cm [1] and λ 11 cm (Altenhoff et al. [2]), the Sagittarius A (Sgr A) radio complex was still observed as a single compact but predominantly nonthermal radio source, well above the level of the diffuse emission from the Galactic Disk.

Low Mass Star Formation in Globular Filaments: Evidence from Dust and Molecular Line Emission

Despite the number of solar mass protostars estimated from the local star formation rate that should be detectable with current receiver technology, only little observational evidence for low-mass candidate protostars undergoing collapse is available. We present results of a search for evidence of protostellar collapse in globular filaments, which led to the identification of two sub-solar mass candidates. Dust observations and radiative transfer modeling confirms the interpretation of the observed CS(2–1) profiles.