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Spectroscopic Identification of Galaxies in the HUDF using MUSE

Hoogland, H.D. (2016) Spectroscopic Identification of Galaxies in the HUDF using MUSE. Bachelor's Thesis, Astronomy.

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The Hubble Ultra-Deep Field (HUDF) is the field of the sky with the deepest multi-wavelength data available to date, which makes it very useful for high redshift galaxy studies. In this thesis we will analyze data taken with the new Multi-Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope (VLT) of the central 1 square arcminute of this field. With a total exposure time of 5 hours and 50 minutes, we found 117 sources in the field. We found 19 intensively star forming and 4 ’red and dead’ galaxies out of a total of 36 objects at low redshift (z<1). The remaining objects do form stars but at a much lower rate; they have only weak emission lines in their spectra. Additionally we found 14 star forming galaxies in the range 1<z<3. For the 9 objects in the range 1.5<z<2.9, we can not say whether they are star forming or not, because no prominent emission lines can be detected by MUSE. We also found 12 Lyα emitters, although the line identification is not certain for some of these objects. Among these are 3 objects which may be a galaxy group candidate at z=5.4. For 35 objects we calculated a lower limit for the Star Formation Rate (SFR), using the luminosities of the OII and Hα emission lines. We found SFR in the range from 0.01 to 3 Msun yr^-1. We cross-matched our sources with the public CANDELS GOODS-South galaxy catalogue. This revealed that 6 objects found in our MUSE data are not present in the CANDELS catalog. Possible explanations are the low average continuum flux of line emitters and source confusion in crowded areas.

Item Type: Thesis (Bachelor's Thesis)
Degree programme: Astronomy
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 15 Feb 2018 08:14
Last Modified: 15 Feb 2018 08:14

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