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Norman
Appleton's
Meteor Page
Phil's Photography
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Welcome to the home page of:
Phil
Appleton
Associate
Research Scientist
NASA Herschel Science Center (NHSC)
California
Institute of Technology
Recent Research Highlights
Powerful Mid-IR Molecular Hydrogen Emission
from Compact Groups and Radio Galaxies
A New Galaxy Population?
Stephan's
Quintet : Green shows the position of the giant
intergalactic
Spectra taken by the Spitzer Space Telescope IRS
shock wave
which is created as NGC 7328b collides at > Mach
100
instrument showing the spectrum is uniquely that of
with gas
in the group. Very powerful molecular hydrogen is
detected
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
X-ray
Since these observations we have discovered more than
luminosity locally from shock). Appleton et al. (2006) ApJL, 631,
L51
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
galaxy passing
through the center of a larger disk, creating a series of expanding
waves of star formation.
Spitzer
Press Release: The Cartwheel Ring at many wavelengths
A Multi-wavelength image of the Cartwheel Ring Galaxy
Galex Press release
and Podcast
This page last updated June 7 2007
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