Other
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011noao.prop..194o&link_type=abstract
NOAO Proposal ID #2011A-0194
Other
Scientific paper
Following up on our great progress at the Gemini South toward characterizing the newly discovered warm diffuse component of the Central Molecular Zone (CMZ) of the Galaxy with CO and H3+ spectroscopy, we propose to complete the basic observations using GNIRS on Gemini North during 2011A (and beyond if necessary). The revealing CO and H3+ spectra obtained with Phoenix at Gemini South on new and much more widespread sightlines through the CMZ, especially those obtained in 2009A and 2010A, are consistent with our interpretation, based on earlier data, that warm diffuse gas in the CMZ, discovered less than ten years ago, is very extensive and perhaps has a larger filling factor than any other gaseous environment there. However, to definitively test this conclusion it is essential observe on additional sightlines widely spaced through the CMZ. These additional key sightlines have yet to be observed in CO and in any H3+ lines, including in particular one key H3+ line, which serves as a thermometer. That line is coincident in wavelength with telluric lines of H2O that are strong and variable on Cerro Pachon; it is much more readily observable on Mauna Kea.
Geballe Tom
Goto Miwa
Indriolo Nick
McCall Ben
Oka Takeshi
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