of Dr. Gregg are listed below
Michael Gregg is an Associate Research Astrophysicist
in the Department of Physics at the University of
California, Davis, but he spends most of his professional
time at the Institute for Geophysics
and Planetary Physics at the Lawrence Livermore
National Laboratory. Michael started his career
investigating the stellar population of relatively
nearby S0 galaxies, showing that they may have evolved
from spiral galaxies. This work spawned investigations
of nearby galaxy clusters.
His collaboration with Michael Drinkwater (U.Queensland)
on the Fornax and Virgo clusters has discovered
"ultra-compact dwarfs'' the first new type
of galaxy to be discovered since Edwin Hubble laid
out the original galaxy classification scheme in
the 1930's. With Michael West (U. Hawaii, Hilo),
he is studying the remains of recently destroyed
galaxies in the Coma and Centaurus clusters. Much
of this nearby galaxy work is done using the Hubble
Space Telescope. At the other end of the Universe,
Michael searches for gravitationally lensed quasars
and more exotic types of quasars nearly buried by
dust or having unusual radio-emitting properties.
Michael was born in Long Beach, California, but
spent most of his childhood roaming the outdoors
of Western Pennsylvania, where the skies are still
dark enough to inspire appreciation of the heavens.
An undergraduate double major in physics and philosophy
at Haverford College, he worked for a summer with
R. Bruce Partridge in that institution's antique
Strawbridge Observatory. This led to further astronomical
studies and a Ph.D. at Yale University where he
was fortunate enough to get to know the late Beatrice
Tinsley while generating the idea for his dissertation.
He has since lived and
worked in Pasadena, Chapel Hill, and Canberra (Australia),
before beginning his longer term association with
U.C. Davis and IGPP/LLNL in 1993. Early in his professional
journey, he married Abbie Rockwell, an elementary
school music teacher. They are raising three precocious
daughters in a sturdy 120 year old house on the
south side of old Livermore.
(University of Queensland, Australia)
I obtained my B.Sc. (1984) from the University
of Sydney and my Ph.D. (1988) from the University
of Cambridge with a thesis on quasar clustering.
From 1988-1991 I was a Research Associate at the
Laval in Québec City, Canada. Here I
worked on quasar absorption line systems, dwarf
galaxies, and the liquid mirror project. I also
learnt to ski and speak French fluently.
From 1991-1996, I was a Staff Astronomer at the
My observatory work focused on completion of the
"second epoch" photographic sky survey,
based at the U.K. Schmidt Telescope. For research
I mainly worked on dwarf galaxy studies in the Virgo
and Fornax clusters as well as a new sample of quasars
from the Parkes radio telescope. I was a Research
Fellow at the University
of New South Wales from1996-1999. At UNSW I
started the "Fornax Cluster Spectroscopic Survey"
using the 2dF spectrograph on the Anglo-Australian
Telescope. I also became a proud father in 1999.
In 1999 I moved to the University
of Melbourne where I became a Senior Research
Fellow. I led the discovery of a new type of galaxy,
"ultra-compact dwarf galaxies" (UCDs)
while at Melbourne, which we then investigated further
using the Hubble Space Telescope. Since 2002 I have
been a Senior Lecturer at the University
Academic Background includes: Ph. D. (Astronomy
and Astrophysics), University of Chicago, 1999;
M. Sc. (Astronomy and Astrophysics), University
of Chicago, 1994; B. A. (Physics) with Honors and
Thesis Honors, University of California, Santa Cruz,
1993. Thesis - "The Dependence of the Mass-Luminosity
Relation on Metallicity.''
Research Interests include Surveys for High Redshift
Clusters of Galaxies; Origin of the Intracluster
Medium; and Stellar Populations of Early-Type Galaxies
I observationally study clusters of galaxies and
the early-type galaxies in those clusters. My goal
is to make physical measurements with the goal of
comparing those values with model predictions. An
example of this can be found in my Fundamental Plane
paper, astro-ph/0412570, where I measure
sizes and velocity dispersions of massive cluster
I am a member of the ACS Science
team. I am working at UC, Santa Cruz on the intermediate redshift
cluster program. We are studying the galaxy members of clusters in
the redshift range of 0.8 to 1.3, selected using the ROSAT Deep Cluster Survey, which is a survey I
have worked on previously, along with clusters from other sources such
as the Gunn, Hoessel, and Oke catalog.
One of the fields in the RDCS has been in the news lately. The Lynx field, which contains four different
clusters has an unusual gravitational arc.
Previously I worked with Adam Stanford. With him, I worked on
studying the ROSAT Deep Cluster Survey and the infrared survey of Stanford, Eisenhardt and Dickinson. This project
yielded the following monstrous
Since May 2001 I am a research assistant at the
(Observatory) of the University
of Bonn. Half of my time I spend in the Satellite
especially in the
spectrophotometric aspects of this program.
The other half of my time I follow the research
lines as listed below and participate in the education
and supervision of undergraduate and graduate students
(see the available diplomathesis
topics). Also I am a member in the Graduiertenkolleg
about "Galaxy Groups as Laboartories for Baryonic
and Dark Matter''.
Before my position in Bonn I have been working as
a post-doc in the department
of astronomy and astrophysics of the Universidad
Católica in Santiago de Chile. My position
there was granted by FONDECYT
(CONICYT) and my supervisor was Prof.
Dr. L. Infante.
My Ph.D. thesis In February 1998 I completed my
Ph.D. thesis at the Sternwarte
Bonn in February 1998. The subject of my thesis
is: "The center of the Fornax cluster: dwarf
galaxies, cD halo, and globular clusters'', supervised
Priv.Doz. Dr. Tom Richtler. During my Ph.D.
research I was partly involved in the
Graduiertenkolleg about "The Magellanic
System and Other Dwarf Galaxies'."
Julio Chaname received his B.S. in 1994, from
Universidad Catolica in Peru and his M.S. in 2000
Pontificia Universidad Catolica in Chile, where
included a dynamical study of NGC 1427A and its
with the environment of the Fornax cluster. He is
working on a Ph.D. at the Ohio State University
Astronomy with interests in the formation of the
and the Local Group, the nature of the dark matter
in the halo
of the Galaxy, the dynamics of stellar systems,
and the theory
of stellar structure and evolution. After graduation
2005 he will be moving to the STScI as a Postdoctoral