Extragalactic Observational Astronomer
Main areas of
Welcome to my office
A false color (negative) image of
interacting Lyman break galaxies
(termed LBG-2377) comprise the brightest LBG at
z ~ 3 known to date (Cooke et al. 2008). These
"embryo" galaxies show evidence that they are merging and
provide information on the physical properties and formation
processes of galaxies about 11.4 billion years ago, when the
universe was only 15% its current age.
| LBGs, like those above, are visible because
they are undergoing a burst of star formation. One cause of
this burst may be the merging of galaxies, as is the case for
the much closer galaxies NGC 4038 and NGC 4039 (image to the
right) known as the Antennae Galaxies.
| The search for z ~ 2 Type IIn
supernovae in the Deep component of the CFHTLS has
spectroscopically confirmed 10 to date, with more to
The images directly to the right illustrate the
first step in finding these distant objects. Each frame shows
the same tiny section of a large one-square-degree image over
three consecutive years and is centered on a z ~ 2 galaxy
that was discovered to host a supernova. The frames consist of
an entire year's worth of images stacked together to better
reveal these faint objects.
Below the three images is the 2004 image with the constant light
from the galaxies subtracted away, revealing the
The 10 supernovae lay between
z = 1.9 - 2.4. Deep spectroscopy with the Keck
telescopes is used for confirmation and study.
With these discoveries, we are witnessing light from explosions
that happened nearly 11 billion years ago. Such detections are
crucial in understanding early stellar and galaxy formation
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The Hubble Space Telescope
| The Milky Way can be seen, as well as two
of our closest companion galaxies, the Large and Small
Magellenic Clouds, in this long-exposure image of the 4
meter telescope at
located in the Southern Hemisphere (Chile).