Bruce Alrick Peterson is a cosmologist based at Mount Stromlo Observatory of the Australian National University.[1][2] Peterson and James Gunn predicted the Gunn–Peterson trough, the absorption effect of neutral hydrogen on the spectra of quasars.[2][3] His research includes studies of quasars, dark matter and the large-scale structure of the unvierse.[2][1]
Bruce Peterson | |
|---|---|
| Born | 1941  |
| Alma mater | |
| Occupation | Astronomer, researcher |
| Employer | |
Childhood and education
editPeterson was born in 1941 in the United States. He was an undergraduate at Massachusetts Institute of Technology and obtained his PhD, "A study of absorption and reddening using absolute magnitudes and colors of galaxies", in 1969 under the supervision of Maarten Schmidt at Caltech.[4][1]
Cosmologist
editPrior to obtaining his PhD, Peterson and James Gunn argued in 1965 that if the universe had a high enough density of neutral hydrogen atoms near a quasar, then almost all photons emitted by the quasar that are more energetic than the Lyman-alpha wavelength of 1216 angstroms should be absorbed by the neutral hydrogen. The effect, called the Gunn–Peterson trough,[2] should yield zero emission at wavelengths shorter than 1216 angstroms (after shifting for redshift) in the observed spectrum of the quasar.[3] The effect was detected in 2001 in a quasar at a redshift of 6.28.[5]
Peterson obtained a research position at Mount Stromlo Observatory at the Australian National University in Australia, where he continued research into quasars and the Stromlo-APM redshift survey.[1] He played a major role in the MACHO Project that was conducted on a Mount Stromlo telescope to look for massive compact halo objects, a possible candidate for dark matter.[6] Peterson was active in the 2dF Galaxy Redshift Survey, in identifications of gamma-ray bursts and in searches for high-redshift quasars.[2]
Awards
editIn 2004, Peterson received a Thomson ISI Citation Laureate for his "outstanding contribution to Space Sciences in Australia". He had the highest number of citations among Australian astronomers for the period from 1980 to 2004: 176 papers cited 11039 times, according to Thomson ISI.[2]
References
edit- ^ a b c d Ragbir Bhathal (23 June 2006), Bruce Peterson interviewed by Ragbir Bhathal in the Australian astronomers oral history project [sound recording], National Library of Australia, Wikidata Q125329958, archived from the original on 4 April 2024
- ^ a b c d e f Research School of Astronomy and Astrophysics – The Australian National University – Annual Report 2004 (PDF), Mount Stromlo Observatory, 2005, Wikidata Q125330252, archived (PDF) from the original on 26 May 2006
- ^ a b James E. Gunn; Bruce Peterson (November 1965). "On the Density of Neutral Hydrogen in Intergalactic Space". The Astrophysical Journal. 142: 1633–1641. Bibcode:1965ApJ...142.1633G. doi:10.1086/148444. ISSN 0004-637X. Wikidata Q55880542.
- ^ Bruce Peterson (1969), A study of absorption and reddening using absolute magnitudes and colors of galaxies (PDF), California Institute of Technology, Wikidata Q125332161, archived (PDF) from the original on 20 July 2018
- ^ Robert H. Becker; Xiaohui Fan; Richard L. White; et al. (December 2001). "Evidence for Reionization at z ~ 6: Detection of a Gunn-Peterson Trough in a z = 6.28 Quasar". The Astronomical Journal. 122 (6): 2850–2857. arXiv:astro-ph/0108097. Bibcode:2001AJ....122.2850B. doi:10.1086/324231. ISSN 0004-6256. Wikidata Q55879678.
- ^ Ragbir Bhathal (1 October 2016). "A life among the galaxies". Astronomy & Geophysics. 57: 5.35–5.36. doi:10.1093/ASTROGEO/ATW184. ISSN 1366-8781. Wikidata Q125330667. Archived from the original on 4 April 2024.