huibintema:projects
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+ | ====== Project archive ====== | ||
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+ | ==== T-RaMiSu: the Two-meter Radio Mini Survey ==== | ||
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+ | With Wendy Williams (Leiden) and Huub Rottgering (Leiden)\\ | ||
+ | Bootes mosaic published as [[http:// | ||
+ | [[http:// | ||
+ | [[ftp:// | ||
+ | [[ftp:// | ||
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+ | We used the GMRT at 150 MHz (2-meter wavelength) to observe two 30 square degree fields in the northern hemisphere, centered on the Bootes field and Abell 2256, respectively. Once intended to be complementary to WSRT LFFE observations, | ||
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+ | ----- | ||
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+ | ==== Deep low-frequency radio observations of the NOAO Bootes field ==== | ||
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+ | With Reinout van Weeren (Leiden), Huub Rottgering (Leiden) and Dharam Vir Lal (MPIfR Bonn) \\ | ||
+ | Published as [[http:// | ||
+ | [[ftp:// | ||
+ | [[http:// | ||
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+ | We observed the NOAO Bootes field with the GMRT at 153 MHz. This yielded an 11.3 square degree field, with a 26" x 22" resolution and a central background noise level of 1 mJy/beam, rising to 2-2.5 mJy/beam towards the edge of the field. The extracted source catalog contains 598 sources, for which the completeness is estimated at ~92 percent for sources >10 mJy, while the contamination is estimated at <1 percent. We have obtained a spectral index for 417 sources in the overlapping region with a WSRT 1.4 GHz map from de Vries et al. (2002), identifying 16 USS sources with a steep spectral index < -1.3. | ||
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+ | ----- | ||
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+ | ==== Large Scale Structure at z = 4: Lyman Break Galaxies in a wide field around Radio Galaxy TN J1338-1942 ==== | ||
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+ | With Bram Venemans (Leiden), Jaron Kurk (Leiden/ | ||
+ | Published as [[http:// | ||
+ | {{: | ||
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+ | The starting point for this undergraduate (master) project was a set of raw (unprocessed) images of a 25' x 25' field-of-view around a luminous, high redshift radio galaxy TN J1338-1942 at redshift z = 4.1. These images were taken with the Suprime-Cam on the Subaru telescope on Mauna Kea, Hawaii, part of a larger observing program to search the environment of high redshift radio galaxies for evidence of galaxy clustering. Luminous radio galaxies are found to be the most massive galaxies in the early universe. It is likely that these objects reside in the centres of proto-clusters, | ||
+ | To map the structure of a galaxy cluster, it is necessary to measure the angular position and the distance (redshift) of large numbers of galaxies. While a moderately accurate method in terms of redshift values, a sensitive and efficient way of finding galaxies at higher redshift is by the use of colors, i.e. differences in wideband magnitudes. The Lyman break technique ([[http:// | ||
+ | The aim of this project was to reduce, calibrate and analyse the raw images, to extract a catalog of Lyman Break Galaxies from these images using color selection criteria by [[http:// | ||
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+ | ----- | ||
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+ | ==== Hydrodynamical Modeling of Spherical Gravitational Collapse ==== | ||
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+ | With Garrelt Mellema (Leiden) and Erik-Jan Rijkhorst (Leiden) \\ | ||
+ | {{: | ||
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+ | The aim of this MSc research project was to model the gravitational collapse of a cloud of gas in (empty) space. Gravitational collapse is the only known mechanism that is able to create structure in the universe, like stars, galaxies or galaxy clusters. Gravitational collapse can occur when local fluctuations in gas mass density appear. For gas clouds in a galaxy, this might be caused by shocks from supernova explosions. Areas with an high enough density contrast compared to the average density contract under self-gravity, | ||
+ | For this project, I applied a hydrodynamical model developed by [[http:// | ||
+ | Although it seems that, in view of modern development of 3-dimensional hydrodynamic codes with adaptive mesh refinement (AMR), that 1-dimensional modeling is a trip back into history, there was still some relevance to this project. One of the most important motivations was the actual implementation of the hydrodynamical model by Eulderink & Mellema for gravitational collapse as a test case. | ||
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huibintema/projects.txt · Last modified: 2020/11/19 15:22 by huibintema