Wide-field spectroscopic observations of comet C/2004 Q2 (Machholz) by GALEX

Details Wide-field spectroscopic observations of comet C/2004 Q2 (Machholz) by GALEX Wide-field spectroscopic observations of comet C/2004 Q2 (Machholz) by GALEX

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.2515m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #25.15; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

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Scientific paper

Comet C/2004 Q2 (Machholz) was observed by the Galaxy Evolution Explorer (GALEX), UT 2005 March 1. The GALEX satellite, a NASA Small Explorer (SMEX) mission, designed to map the history of star formation in the Universe (Martin et al. 2005), is also well suited to cometary coma studies because of its high sensitivity and large field of view. Improved spacecraft aspect information, recently made available to our Guest Investigator team has allowed us to accurately take out cometary motion and co-add all 4 orbits of grism observations. The resulting increase in S/N from previous analyses (Morgenthaler et al. 2005) and the availability of on-orbit calibration (Morrissey et al. 2005) allow us to establish preliminary production rates and scale lengths for the bright UV cometary features seen in the data. We use simple Haser models, with scale lengths modified to emulate the vectorial model (Combi et al. 2004) to map coma emission from several species, including OH and CS in the NUV (175--310 nm) and C I in the FUV (135--175 nm). This work was supported by the GALEX guest investigator program.

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