7 papers
The Nuclei of Late-type Spiral Galaxies
T. Boeker, C. -J. Walcher, H. -W. Rix +8
We summarize some recent results from our observational campaign to study the central regions of spiral galaxies of late Hubble type (Scd - Sm). These disk-dominated, bulgeless gal…
Molecular Gas in Tidal Dwarf Galaxies: On-going Galaxy Formation
J. Braine, P. -A. Duc, U. Lisenfeld +3
We investigate the process of galaxy formation as can be observed in the only currently forming galaxies -- the so-called Tidal Dwarf Galaxies, hereafter TDGs -- through observatio…
Study of the Interstellar Medium and Star Formation of a complete sample of 760 isolated galaxies
U. Lisenfeld, L. Verdes-Montenegro, D. Espada +2
A key problem in astronomy involves the role of the environment in the formation and evolution of galaxies. In order to answer this question it is necessary to characterize a refer…
Molecular gas in the intergalactic medium of Stephan's Quintet
Ute Lisenfeld, Stephane Leon, Jonathan Braine +3
Stephan's Quintet (SQ) is a Hickson Compact Group well known for its complex dynamical and star formation history and its rich intergalactic medium (IGM). In order to study the ext…
Star Formation in Tidal Dwarf Galaxies
U. Lisenfeld, J. Braine, O. Vallejo +4
Tidal Dwarf Galaxies (TDGs) are objects presently forming from gas which has been expelled from their parent galaxies during an interaction. We observed the CO emission of a sample…
On the radio spectral index of galaxies
U. Lisenfeld, H. J. Voelk
The radio emission of a galaxy consists of thermal bremsstrahlung, synchrotron emission from discrete supernova remnants, and diffuse synchrotron emission from cosmic ray electrons…