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Proposal Identification No.: A2153 Date Received: 2005 ­Oct­03 07:22:54
Technical Page
Proposal Type: Regular
General Category: Astronomy
Sub­Category: Spectroscopy
Observation Category: Galactic
Total Time Requested: 39 Hours
Proposal Title: Faint HI 21­cm Emission Line Wings at Forbidden Velocities
ABSTRACT:
Large­scale (l,v) diagrams of HI 21­cm line emission in the Galactic plane show small high­velocity bumps
protruding from their surroundings. Because those wing­like features are extended to the velocities forbidden by the
Galactic rotation, they are called as Forbidden­Velocity Wings (FVWs). FVWs are interesting objects because they
are the sites where dynamic Galactic events, e.g., supernova explosions, accelerate their surrounding gas and
interact with the ISM. We have made a catalog of FVWs using the Leiden/Dwingeloo HI survey and the HI
Southern Galactic Plane Survey, and identified about 90 FVWs. We carried out high­resolution HI observation
toward 14 FVWs using Arecibo and Green Bank telescope, and found that about 60% of the observed FVWs are
shell­like features and the rest are clumpy or irregular features. However, the number of the observed FVWs is not
enough to conjecture the nature of the whole FVWs. Thus, we propose to observe 13 FVWs in the outer and inner
Galaxy, and request 39 hours. They are all the FVWs that is available at Arecibo but not observed yet. There is a
seperate proposal to map the entire inner Galactic plane by Koo, Gibson, et al. If that proposal is accepted, we
may need only 24 hours to map the 8 FVWs in the outer Galaxy.
Name Institution E­mail Phone Student
Ji­hyun Kang Seoul National Uni­
versity
kjh@astro.snu.ac.kr G
Service Observing Request Remot e Observing Request
X None No
All of the observing run. X Maybe
Part of the observing run. Yes
Queue Observing
Instrument Setup
ALFA
Atmospheric Observation Instruments:
1

Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
1416 ­ 1424 MHz
2