Journal article
6.7GHz CH3OH Absorption toward the N3 Galactic Center Point Source
The Astrophysical journal, Vol.889(2), 174
02/01/2020
DOI: 10.3847/1538-4357/ab5af8
Abstract
We present evidence of 6.7 GHz methanol (CH3OH) and 4.8 GHz formaldehyde (H2CO) absorption toward the Galactic Center (GC) point source "N3." Both absorption features are unresolved and spatially aligned with N3. The 6.7 GHz CH3OH contains a single-velocity component (centered at similar to 10 km s(-1)), while the 4.8 GHz H2CO shows two-velocity components (centered at similar to-3 and +8 km s(-1)). We find that the velocities of these absorption components are similar to that of emission lines from other molecules (e.g., SiO and HC3N) detected toward this compact source (-13 to +25 km s(-1); "N-3 cloud"). The detection of these absorption features is a firm indication that some of the molecular gas in the N3 molecular cloud is on the near side of the continuum source. Analysis of the CH3OH absorption kinematics shows a relatively large velocity dispersion (3.8 km s(-1)) for the size scale of this feature (<0.'' 1, <0.01 pc at the GC), when compared with other similarly sized GC clouds in the Larson line width-size relationship. Furthermore, this line width is closer to velocity dispersion measurements for size scales of 1.3 pc, which is roughly the width of the N3 cloud (25 ''; 1.0 pc). We argue that this relatively broad line width, over a small cross-sectional area, is due to turbulence through the depth of the cloud, where the cloud has a presumed line-of-sight thickness of similar to 1 pc.
Details
- Title: Subtitle
- 6.7GHz CH3OH Absorption toward the N3 Galactic Center Point Source
- Creators
- Natalie O. Butterfield - Green Bank Observ, 155 Observ Rd,POB 2, Green Bank, WV 24944 USAAdam Ginsburg - Univ Florida, Dept Astron, POB 112055, Gainesville, FL 32611 USADominic A. Ludovici - Rose–Hulman Institute of TechnologyAshley Barnes - University of BonnRiley Dunnagan - Rose–Hulman Institute of TechnologyCornelia C. Lang - University of IowaMark R. Morris - Univ Calif Los Angeles, Dept Phys & Astron, 430 Portola Plaza, Los Angeles, CA 90095 USA
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.889(2), 174
- DOI
- 10.3847/1538-4357/ab5af8
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Publisher
- Iop Publishing Ltd
- Number of pages
- 6
- Grant note
- 726384 / European Union's Horizon 2020 research and innovation programme
- Language
- English
- Date published
- 02/01/2020
- Academic Unit
- Liberal Arts and Science Admin; Physics and Astronomy
- Record Identifier
- 9984429031602771
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