Urmas Haud
| Office: | Address: |
Tartu Observatory, |
| | | EE61602
Tõravere, |
| | | Tartumaa, Estonia. |
| | Phone: | (372)7 - 410 305 |
| | Fax: | (372)7 - 410 205 |
| | E-mail: |
urmas@aai.ee |
| Home: | Address: | Observatooriumi 7-5 |
| | | EE61602
Tõravere, |
| | | Tartumaa, Estonia. |
| | Phone: | (372)7 - 410 275 |
The main field of research is the structure of the Galaxy and other
nearby galaxies. The studies may be divided into two blocks:
-
Construction of dynamical and structural models of our Galaxy, the
Andromeda galaxy M31, and other stellar systems. I have proposed a new
method for determining the rotation curves of galaxies, which takes
into account the possibility of radial gas flows in these systems. For
computing the model parameters of galaxies, a computer program has been
derived, which determines all needed values from the observational data
by the method of least squares. An attempt has been made to incorporate
in the model practically all available data on the structure,
kinematics and astrophysical properties of galaxies and their basic
populations. These studies were the subject of my C. Sc. Thesis
"Galactic Model" in 1985.
-
Studies on the structure of the environments of galaxies and their
interaction with main bodies of these systems. I have studied the
hypothesis that giant galaxies are surrounded by nearly spherical but
slightly triaxial dark massive coronas. I have looked for observable
effects in the motion of the gas in outer parts of these galaxies due
to triaxiality of the potential. Special interest in this field has
been devoted to high velocity hydrogen clouds (HVC's). I have proposed
a new hypothesis that a part of the HVC's around our Galaxy together
with some dwarf companions of the Milky Way constitute a structure
resembling a polar ring around our system. Using the companions of
other giant galaxies, it has been shown that such structures may be
common among galaxies. I have proposed also a new indirect method for
estimating the distances to HVC's. These studies were the subject of my
D. Sc. Thesis "Dark Matter in Galaxies" in 1991.
I have studied the history of villages
Riisa and Tõramaa (today these places can be
visited
as a part of the Soomaa
National Park) and my family tree
starting in this region. Today their
kinsmen can be met all over the world.
If you are interested about finding your own relatives, living in
Estonia, and plan to ask from me some instructions, how to start, you
may first read
my standard answer
to such questions. If you have still questions after this, or expect
that we may have some relationship, please
e-mail me.
|
 |
visits since June 18, 1996. a. |
Last updated: September 21, 2008.
U. Haud, urmas@aai.ee
