Gravitationally Lensed, High-Redshift Starburst Galaxies
Local, massive galaxies are seen to host very old stellar populations. This indi cates that a significant fraction of the stellar mass was formed during early epochs. The discovery of intense starburst galaxies at high redshifts have suggested that such galaxies are part of an evolutionary sequence...
Main Author: | |
---|---|
Other Authors: | , , |
Format: | Other/Unknown Material |
Language: | English |
Published: |
2022
|
Subjects: | |
Online Access: | https://hdl.handle.net/20.500.12380/304939 |
id |
ftchalmersuniojs:oai:odr.chalmers.se:20.500.12380/304939 |
---|---|
record_format |
openpolar |
spelling |
ftchalmersuniojs:oai:odr.chalmers.se:20.500.12380/304939 2023-07-30T04:06:55+02:00 Gravitationally Lensed, High-Redshift Starburst Galaxies Bredberg, Markus Chalmers tekniska högskola / Institutionen för rymd-, geo- och miljövetenskap Thomasson, Magnus Knudsen, Kirsten Kraiberg 2022-06-29T09:35:24Z application/pdf https://hdl.handle.net/20.500.12380/304939 eng eng SEEX30 https://hdl.handle.net/20.500.12380/304939 high-redshift — Gravitational lensing: strong — Tech niques: interferometric — Telescopes: ALMA H 2022 ftchalmersuniojs https://doi.org/20.500.12380/304939 2023-07-08T19:56:45Z Local, massive galaxies are seen to host very old stellar populations. This indi cates that a significant fraction of the stellar mass was formed during early epochs. The discovery of intense starburst galaxies at high redshifts have suggested that such galaxies are part of an evolutionary sequence towards today’s massive galax ies. This master’s thesis provides an introductory theoretical background in the history and very basics of the study of galaxies, techniques and methods in ob servational radio astronomy, and evolution of distant, massive galaxies. After this summary, two redshift z=2.5-2.8 sources, discovered by the South Pole Telescope (SPT), are analysed through the visibility-based lens modeling tool visilens. Spectra and galaxy-galaxy gravitational lensing models are obtained from ∼ 0.1 00 resolution data from the Atacama Large Millimeter/submillimeter Array of the CO(3-2) line from SPT0125-47 and SPT2134-50. Results indicate magnifications of µ = 15.4 ± 0.9 for SPT0125-47 and µ = 20.2 ± 2.9 for SPT2134-50. The cor responding FWHMs are (380 ± 47) km s−1 and (550 ± 87) km s−1 , which leads to intrinsic line luminosities L 0 CO(3−2) = (5.1 ± 0.84)1010 K km s−1 pc2 and L 0 CO(3−2) = (1.5 ± 0.31)1010 K km s−1 pc2 , respectively. From previous derived relations, the gas masses are determined to Mgas = (3.4±1.1)1010 M and Mgas = (1.6±0.49)1010 M respectively. The molecular gas mass estimates are similar to dynamical estimates assuming rotation, which suggests that the inner region of these galaxies are gas dominated. A skewed emission line and magnification for SPT0125-47 suggests that this source is either a rotating disc or a system of galaxy mergers. Other/Unknown Material South pole Chalmers University of Technology: Chalmers Open Digital Repository (ODR) South Pole |
institution |
Open Polar |
collection |
Chalmers University of Technology: Chalmers Open Digital Repository (ODR) |
op_collection_id |
ftchalmersuniojs |
language |
English |
topic |
high-redshift — Gravitational lensing: strong — Tech niques: interferometric — Telescopes: ALMA |
spellingShingle |
high-redshift — Gravitational lensing: strong — Tech niques: interferometric — Telescopes: ALMA Bredberg, Markus Gravitationally Lensed, High-Redshift Starburst Galaxies |
topic_facet |
high-redshift — Gravitational lensing: strong — Tech niques: interferometric — Telescopes: ALMA |
description |
Local, massive galaxies are seen to host very old stellar populations. This indi cates that a significant fraction of the stellar mass was formed during early epochs. The discovery of intense starburst galaxies at high redshifts have suggested that such galaxies are part of an evolutionary sequence towards today’s massive galax ies. This master’s thesis provides an introductory theoretical background in the history and very basics of the study of galaxies, techniques and methods in ob servational radio astronomy, and evolution of distant, massive galaxies. After this summary, two redshift z=2.5-2.8 sources, discovered by the South Pole Telescope (SPT), are analysed through the visibility-based lens modeling tool visilens. Spectra and galaxy-galaxy gravitational lensing models are obtained from ∼ 0.1 00 resolution data from the Atacama Large Millimeter/submillimeter Array of the CO(3-2) line from SPT0125-47 and SPT2134-50. Results indicate magnifications of µ = 15.4 ± 0.9 for SPT0125-47 and µ = 20.2 ± 2.9 for SPT2134-50. The cor responding FWHMs are (380 ± 47) km s−1 and (550 ± 87) km s−1 , which leads to intrinsic line luminosities L 0 CO(3−2) = (5.1 ± 0.84)1010 K km s−1 pc2 and L 0 CO(3−2) = (1.5 ± 0.31)1010 K km s−1 pc2 , respectively. From previous derived relations, the gas masses are determined to Mgas = (3.4±1.1)1010 M and Mgas = (1.6±0.49)1010 M respectively. The molecular gas mass estimates are similar to dynamical estimates assuming rotation, which suggests that the inner region of these galaxies are gas dominated. A skewed emission line and magnification for SPT0125-47 suggests that this source is either a rotating disc or a system of galaxy mergers. |
author2 |
Chalmers tekniska högskola / Institutionen för rymd-, geo- och miljövetenskap Thomasson, Magnus Knudsen, Kirsten Kraiberg |
format |
Other/Unknown Material |
author |
Bredberg, Markus |
author_facet |
Bredberg, Markus |
author_sort |
Bredberg, Markus |
title |
Gravitationally Lensed, High-Redshift Starburst Galaxies |
title_short |
Gravitationally Lensed, High-Redshift Starburst Galaxies |
title_full |
Gravitationally Lensed, High-Redshift Starburst Galaxies |
title_fullStr |
Gravitationally Lensed, High-Redshift Starburst Galaxies |
title_full_unstemmed |
Gravitationally Lensed, High-Redshift Starburst Galaxies |
title_sort |
gravitationally lensed, high-redshift starburst galaxies |
publishDate |
2022 |
url |
https://hdl.handle.net/20.500.12380/304939 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
SEEX30 https://hdl.handle.net/20.500.12380/304939 |
op_doi |
https://doi.org/20.500.12380/304939 |
_version_ |
1772819891947044864 |