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Identification of the Microlens in Event MACHO-LMC-20
Nitya Kallivayalil, Brian M. Patten, Massimo Marengo +3
We report on the identification of the lens responsible for microlensing event MACHO-LMC-20. As part of a \textit{Spitzer}/IRAC program conducting mid-infrared follow-up of the MAC…
9.7 um Silicate Features in AGNs: New Insights into Unification Models
Y. Shi, G. H. Rieke, D. C. Hines +6
We describe observations of 9.7 um silicate features in 97 AGNs, exhibiting a wide range of AGN types and of X-ray extinction toward the central nuclei. We find that the strength o…
Spitzer Survey of the Large Magellanic Cloud, Surveying the Agents of a Galaxy's Evolution (SAGE) I: Overview and Initial Results
Margaret Meixner, Karl D. Gordon, Remy Indebetouw +46
We are performing a uniform and unbiased, ~7x7 degrees imaging survey of the Large Magellanic Cloud (LMC), using the IRAC and MIPS instruments on board the Spitzer Space Telescope…
IRS Spectra of Solar-Type Stars: A Search for Asteroid Belt Analogs
C. A. Beichman, A. Tanner, G. Bryden +6
We report the results of a spectroscopic search for debris disks surrounding 41 nearby solar type stars, including 8 planet-bearing stars, using the {\it Spitzer Space Telescope}.…
IRS Spectra of Solar-Type Stars: \break A Search for Asteroid Belt Analogs
C. A. Beichman, A. Tanner, G. Bryden +6
We report the results of a spectroscopic search for debris disks surrounding 41 nearby solar type stars, including 8 planet-bearing stars, using the {\it Spitzer Space Telescope}.…
Discovery of a 500 pc shell in the nucleus of Centaurus A
Alice C. Quillen, Joss Bland-Hawthorn, Mairi H. Brookes +5
Spitzer Space Telescope mid-infrared images of the radio galaxy Centaurus A reveal a shell-like, bipolar, structure 500 pc to the north and south of the nucleus. This shell is seen…
Spitzer observations of the dusty warped disk of Centaurus A
Alice C. Quillen, Mairi H. Brookes, Jocelyn Keene +3
Spitzer mid-infrared images of the dusty warped disk in the galaxy Centaurus A show a parallelogram-shaped structure. We successfully model the observed mid-infrared morphology by…