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Photometry of the UWISH2 extended H2 source catalogue

Nicholas, Jack (2016) Photometry of the UWISH2 extended H2 source catalogue. Master of Science by Research (MScRes) thesis, University of Kent.

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Abstract

The UKIRT Widefield Infrared Survey for H2 (UWISH2) is a large, unbiased survey of extended H2 emission sources, using the 1-0 S(1) emission line at 2.122?m. It covers 209 square degrees of the Galactic Plane (GP) between l ? 357° to l ? 66° and b ? ±1.5°. UWISH2 further covers high column density regions in Cygnus and Auriga, covering approximately 42 and 35.5 square degrees respectively and leading to a total survey coverage of ? 286.5 square degrees. As part of the UWISH2 team, I have performed the photometry for 33200 individual H2 features, which have been found to compose ~ 700 H2 jets and outflows, 284 planetary nebulae (PNe), 30 supernova remnants (SNRs) and ~ 1300 photo-dissociation regions (PDRs). About 60% of PNe are newly discovered candidates. Using H2 emission as a tracer for star formation, I find that the majority of H2 flux is located in the lower Galactic longitudes for jet and PDR features, indicating increased star formation activity. I have also observed partial concentrations of high H2 flux at higher Galactic longitudes in the GP from jet features but not PDR features, indicating a lack of high-mass star formation at this region. I offer two methods of photometry: the 'total flux' photometry and the 'median surface brightness times area' photometry. Upon comparing the ratios of the fluxes from both photometries for each feature, I find good agreement (full catalogue: ~ 97% in a 100% deviation and ~ 82% in a 20% deviation) for all feature classes except jets, and recommend the median surface brightness times area photometry for all feature types except jets, which should use total flux photometry. Finally, I have calculated the signal-to-noise ratios for individual features, finding the median value for the entire survey to be approximately 15 when using the feature area.

Item Type: Thesis (Master of Science by Research (MScRes))
Thesis advisor: Froebrich, Dirk
Uncontrolled keywords: star formation; ISM; H2; jets; outflows; planetary nebulae; supernovae remnants; photo-dissociation regions; HII regions; galactic plane; photometry; catalogue;
Subjects: Q Science > Q Science (General)
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Users 1 not found.
Date Deposited: 12 Apr 2016 09:00 UTC
Last Modified: 29 May 2019 17:11 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/54879 (The current URI for this page, for reference purposes)
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