Welcome to the home page of:
NHSC Project Scientist and Team Lead
NASA Herschel Science Center (NHSC)
Institute of Technology
Recent Research Highlights
Powerful Mid-IR Molecular Hydrogen Emission
from Compact Groups and Radio Galaxies
A New Galaxy Population?
Quintet : Green shows the position of the giant
Spectra taken by the Spitzer Space Telescope IRS
which is created as NGC 7328b collides at > Mach
instrument showing the spectrum is uniquely that of
in the group. Very powerful molecular hydrogen is
molecular hydrogen with little else seen in the spectrum (Appleton et al. 2006).
from the shock wave
(L_H2 ~ 10^41 ergs/s or ten times the
Since these observations we have discovered more than
luminosity locally from shock). Appleton et al. (2006) ApJL, 631,
10 radio galaxies with similar spectra and even brighter H2 (Ogle et al. 2006).
Collisional Ring Galaxies in the Ultra
Violet and Infrared with Galex and Spitzer
Observations with Spitzer and Galaxy are providing a multi-wavelength
view of these collisionally induced ring galaxies caused by a small
through the center of a larger disk, creating a series of expanding
waves of star formation.
Press Release: The Cartwheel Ring at many wavelengths
A Multi-wavelength image of the Cartwheel Ring Galaxy
Galex Press release
This page last updated June 7 2007