Colloquia

Jacek Krelowski : Dark Matter – True or Myth?

Seminario

“Dark Matter – True or Myth?”

Jacek Krelowski

Universidad Nicolaus Copernicus
Torum – Poland 

The mysterious Dark Matter is currently being called the Saint Graal of science. The estimates of its
mass give the values many times higher than that of the “traditional” baryonic matter. However, all
attempts to detect this form of matter directly (not via its gravity) failed. One of the serious
problem follows the fact that the crucial evidence of the Dark Matter follows flat rotation curves
of spiral galaxies. One of the main sources of uncertainty follows the distance measurements. Basing
on the huge collection of echelle spectra of OB stars we demonstrated that distances to such objects
can be reliably estimated using intensities of interstellar CaII H and K lines. The same lines allow
also to measure Doppler shifts to the most distant clouds along any sightline with the precision much
higher than in the case of stellar spectra as the latter are influenced by fast rotation and binarity
of many OB stars. The talk will demonstrate that even the existing data create serious doubts as to
the existence of Dark Matter: the rotation curves of young, disk population objects clearly follow
keplerian rather than flat rotation curve of the Milky Way. To avoid existing uncertainties it is necessary
to collect a statistically significant sample of objects. The most interesting directions in the
galactic disk are these at l = 135 deg., l = 180 deg and l = 225 deg.

Lugar:

Sala  de Seminario Inst. Astronomia

Fecha:

Jueves 12  de Septiembre 2013

Hora:

15:00 horas