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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 730236.0, MPI für Astronomie / Publikationen_mpia
Gas in the CMZ toward the Galactic nucleus studied by H3+ and CO spectra
Authors:Goto, M.; Geballe, T. R.; Usuda, T.; Indriolo, N.; McCall, B. J.; Oka, T.
Date of Publication (YYYY-MM-DD):2015-01
Title of Journal:AIP Conference Series
Issue / Number:1
Start Page:377
End Page:379
Audience:Not Specified
Abstract / Description:Infrared spectroscopy of H3+ toward the Galactic center uncovered the presence of vast amount of diffuse (100 cm-3) and warm gas (250 K) filling the Central Molecular Zone of our Galaxy (CMZ; R< 200 pc). We present a detailed view of the cloud, with yet higher resolution spectroscopy of H3+ and 13CO toward two bright sources in the Central cluster. H3+ R(2,2)l absorption is clearly detected toward GCIRS 3 at +60 km s-1, and less significantly in GCIRS 1W at the positive velocity. R(2,2)l absorption represents warmer (> 200 K) and moderately dense gas (200 cm-3) local in the Galactic nucleus. The absorption profiles of H3+ R(1,1)l consists of two components. The one is sharp absorption lines in the negative velocity, that represents the diffuse clouds in the foreground Galactic Arms. The other is the trough absorption spanning from -150 to +90 km s-1. The absorption profile of the trough component has detailed structure with several absorption minima, which was not noticed in the previous lower resolution spectroscopy. The detailed coincidence in the trough absorption in R(1,1)l and R(3,3)l implies clumpy structure in the gas, yet with the uniform temperature throughout the CMZ.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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