The Galactic fountain as an origin for the Smith Cloud. (26th September 2016)
- Record Type:
- Journal Article
- Title:
- The Galactic fountain as an origin for the Smith Cloud. (26th September 2016)
- Main Title:
- The Galactic fountain as an origin for the Smith Cloud
- Authors:
- Marasco, A.
Fraternali, F. - Abstract:
- Abstract : The recent discovery of an enriched metallicity for the Smith high-velocity H i Cloud (SC) lends support to a Galactic origin for this system. We use a dynamical model of the galactic fountain to reproduce the observed properties of the SC. In our model, fountain clouds are ejected from the region of the disc spiral arms and move through the halo interacting with a pre-existing hot corona. We find that a simple model where cold gas outflows vertically from the Perseus spiral arm reproduces the kinematics and the distance of the SC, but is in disagreement with the cloud's cometary morphology, if this is produced by ram-pressure stripping by the ambient gas. To explain the cloud morphology, we explore two scenarios: (i) the outflow is inclined with respect to the vertical direction and (ii) the cloud is entrained by a fast wind that escapes an underlying superbubble. Solutions in agreement with all observational constraints can be found for both cases, the former requires outflow angles >40° while the latter requires ≳1000 km s −1 winds. All scenarios predict that the SC is in the ascending phase of its trajectory and has large – but not implausible – energy requirements.
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 464:Number 1(2017:Jan.)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 464:Number 1(2017:Jan.)
- Issue Display:
- Volume 464, Issue 1 (2017)
- Year:
- 2017
- Volume:
- 464
- Issue:
- 1
- Issue Sort Value:
- 2017-0464-0001-0000
- Page Start:
- L100
- Page End:
- L104
- Publication Date:
- 2016-09-26
- Subjects:
- ISM: bubbles -- ISM: clouds -- ISM: jets and outflows -- Galaxy: halo
Astronomy -- Research -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1745-3933 ↗
http://www.blackwell-synergy.com/loi/mnl ↗
http://www3.interscience.wiley.com/journal/118500770/home ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnrasl/slw195 ↗
- Languages:
- English
- ISSNs:
- 1745-3933
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5944.000100
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 12135.xml