Radio Astronomy, the Universe seen with other Eyes
DOI:
https://doi.org/10.36790/epistemus.v18i36.301Keywords:
wavelength, electromagnetic spectrum, antenna, antenna array, radioastronomyAbstract
Since our eyes can only see at a specific range of electromagnetic spectrum wavelengths (called visible region), the study of the Universe in this particular range is a widespread and intuitive activity for humans. However, it is possible to discover new structures and phenomena by observing the same celestial objects at wavelengths that are different from the visible ones. This work describes an interesting, although not well-known, branch of astronomy, the radio astronomy. This paper presents some history, observing techniques, and recent astonishing discoveries achieved by radio astronomers.
Downloads
References
K.G. Jansky, “Directional Studies of Atmospherics at High Frequencies,” Proc. Inst. Rad. Eng., vol. 20, num.12, pp.1920-1932, Diciembre 1932. DOI:10.1109/JRPROC.932.227477 DOI: https://doi.org/10.1109/JRPROC.1932.227477
K.G. Jansky, “Radio Waves from Outside the Solar System” , Nature, vol. 132, 3323, pp. 66-66, Mayo 1933. DOI:10.1038/132066a0 DOI: https://doi.org/10.1038/132066a0
K.G. Jansky, “Electrical Disturbances apparently of Extraterrestial Origin”, Proc. Inst. Rad. Eng., vol. 21, num. 10, pp. 1387-1398. Octubre 1933. DOI:10.1109/JRPROC.1933.227458 DOI: https://doi.org/10.1109/JRPROC.1933.227458
F.H. Shu, F.C. Adams, S. Lizano, “Star Formation in Molecular Clouds”, Ann.Rev.Astron.Astrophys., 25, pp. 23-81, Septiembre 1987. DOI:10.1038/132066a0 DOI: https://doi.org/10.1146/annurev.aa.25.090187.000323
ALMA Partnership, C.L. Brogan, L.M. Pérez, T.R. Hunter, W.R.F. Dent et al. “The 2014 ALMA Long Baseline Campaign: First Results from High Angular Resolution Observations Toward the HL Tau Region”, Julio 2015. DOI:10.1088/2041-8205/808/1/L3 DOI: https://doi.org/10.1088/2041-8205/808/1/L3
A.Isella, M. Benisty, R. Teague, J. Bae, M. Keppler et al., “Detection of Continuum Submillimeter Emission Associated with Candidate Protoplanets”, ApJL, 879, L25, Julio 2019. DOI:10.3847/2041-8213/ab2a12 DOI: https://doi.org/10.3847/2041-8213/ab2a12
L. Woltjer, “Emission Nuclei in Galaxies”, ApJ, 130, pp. 38-44, Febrero 1959. DOI: 10.1086/146694 DOI: https://doi.org/10.1086/146694
E.E. Salpeter, “NOTES: Accretion of Interstellar Matter by Massive Objects”, ApJ, 140, pp. 796-800, Agosto 1964. DOI: 10.1086/147973 DOI: https://doi.org/10.1086/147973
J.M. Bardeen, “Kerr Metrics Black Holes”, Nature, 226, pp. 64-65, Abril 1970. DOI: 10.1038/226064a0 DOI: https://doi.org/10.1038/226064a0
G.R. Burbidge, “The Nuclei of Galaxies”, Ann.Rev.Astron.Astrophys., 8, pp. 369-460, 1970. DOI: 10.1146/annurev.aa.08.090170.002101 DOI: https://doi.org/10.1146/annurev.aa.08.090170.002101
V.L. Ginzburg y L.M. Ozernoy, “On the Nature of Quasars and Galactic Nuclei”, Astrophysics and Space Science, 50, pp. 23-41, Agosto 1977. DOI: 10.1007/BF00648516 DOI: https://doi.org/10.1007/BF00648516
É. A. Dibai, “Mass of the Central Bodies of Active Galactic Nuclei”, Soviet Astronomy Letters, 3, pp. 1-3, Febrero 1977.
A. Cavaliere, “Active Galactic Nuclei”, in 16th International Cosmic Ray Conference, 14, pp. 91-103, University of Tokyo: Institute for Cosmic Ray Research, Ed. M. Saburo, 1979.
Netzer, H., “Revisiting the Unified Model of Active Galactic Nuclei”, Ann.Rev.Astron.Astrophy., 53, pp. 365-408, Agosto 2015. DOI:https://doi.org/10.1146/annurev-astro-082214-122302 DOI: https://doi.org/10.1146/annurev-astro-082214-122302
Event Horizon Telescope Collaboration, K. Akiyama, A. Alberdi, W. Alef, K. Asada, R. Azulay, et. al., “First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole ”, ApJL, 875, L1, Abril 2019. DOI: https://doi.org/10.3847/2041-8213/ab0ec7 DOI: https://doi.org/10.3847/2041-8213/ab0ec7
Event Horizon Telescope Collaboration, K. Akiyama, A. Alberdi, W. Alef, K. Asada, R. Azulay, et. al., “First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole ”, ApJL, 875, L4, Abril 2019. DOI: 10.3847/2041-8213/ab0e85 DOI: https://doi.org/10.3847/2041-8213/ab0e85
Event Horizon Telescope Collaboration, K. Akiyama, “First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole ”, ApJL, 875, L6, Abril 2019. DOI: 10.3847/2041-8213/ab1141 DOI: https://doi.org/10.3847/2041-8213/ab1141
G. Reber, “Notes: Cosmic Static”, ApJ, 91, pp. 621-624, 1940. DOI:10.1086/144197 DOI: https://doi.org/10.1086/144197
G. Reber, “Cosmic Static”, ApJ, 100, pp. 279-287, Mayo 1944. DOI:10.1086/144668 DOI: https://doi.org/10.1086/144668
G. Reber, “Radio Astronomy”, Sci. Am., Vol. 181, Núm. 3, pp. 34-41, Septiembre 1949. DOI:10.1038/scientificamerican0949-34 DOI: https://doi.org/10.1038/scientificamerican0949-34
D. Lynden-Bell y M.J. Rees, “On Quasars, Dust and the Galactic Center”, MNRAS, 152, pp. 461-475, Julio 1971. DOI: 10.1093/mnras/152.4.461 DOI: https://doi.org/10.1093/mnras/152.4.461
C. Hazard y S. Mitton, “Active Galactic Nuclei”, Cambridge University Press, Abril 1980.
R. Genzel y C.H. Townes, “The Nucleus of our Galaxy”, Ann.Rev.Astron.Astrophys., 25, pp. 377-423, Septiembre 1987. DOI: 10.1146/annurev.aa.25.090187.002113 DOI: https://doi.org/10.1146/annurev.aa.25.090187.002113
R. Genzel, D. Hollenbach y C.H. Townes, “The Nucleus of our Galaxy” , Rep. Prog. Phys. 57, 417, Mayo 1994. DOI:10.1088/0034-4885/57/5/001 DOI: https://doi.org/10.1088/0034-4885/57/5/001
A.M. Ghez, G. Duchêne, K. Matthews, S.D. Hornstein, A. Tanner et al., “The First Measurement of Spectral Lines in a Short-Period Star Bound to the Galaxy´s Central Black Hole: A Paradox of Youth”, ApJ, 586, L127-L131, Abril 2003. DOI:10.1086/374804 DOI: https://doi.org/10.1086/374804
M.G. Revnivtsev, E.M. Churazov, S.Yu. Sazonov, R.A. Sunyaev, A.A. Lutovinov et al., “Hard X-ray View of the Past Activity of SgrA* in a Natural Compton Mirror”, Astron.Astrphys., 425, L49-L52, Agosto 2004. DOI: 10.1051/0004-6361:200400064 DOI: https://doi.org/10.1051/0004-6361:200400064
R. Lu, T.P. Krichbaum, A.L. Roy, V.L. Fish, S.S. Doeleman et al., “Detection of Instrinsic Source Structure at 3 Schwarzschild Radii with Millimeter-VLBI Observations of SAGITARIUS A”, ApJ, 859, 60 , Mayo 2018. DOI: 10.3847/1538-4357/aabe2e DOI: https://doi.org/10.3847/1538-4357/aabe2e
I. Heywood, F. Camilo, W.D. Cotton, F. Yusef-Zadeh, T.D. Abbott, et al. “Inflation of 430-parsec bipolar radio bubbles in the Galactic Centre by an energetic event ”, Nature, 573, pp. 235-237, Septiembre 2019. DOI: 10.1038/s41586-019-1532-5 DOI: https://doi.org/10.1038/s41586-019-1532-5
Event Horizon Telescope Collaboration, K. Akiyama, A. Alberdi, W. Alef, J.C. Algaba, R. Anantua, et. al., “First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way”, ApJL, 930, L12, Mayo 2022. DOI: 10.3847/2041-8213/ac6674 DOI: https://doi.org/10.3847/2041-8213/ac6674
Event Horizon Telescope Collaboration, K. Akiyama, A. Alberdi, W. Alef, J.C. Algaba, R. Anantua, et. al., “First Sagittarius A* Event Horizon Telescope Results. III. Imaging of the Galactic Center Supermassive Black Hole ”, ApJL, 930, L14, Mayo 2022. DOI: 10.3847/2041-8213/ac6429 DOI: https://doi.org/10.3847/2041-8213/ac6429
Event Horizon Telescope Collaboration, K. Akiyama, A. Alberdi, W. Alef, J.C. Algaba, R. Anantua, et. al., “First Sagittarius A* Event Horizon Telescope Results. IV. Variability, Morphology, and Black Hole Mass”, ApJL, 930, L15, Mayo 2022. DOI: 10.3847/2041-8213/ac6736 DOI: https://doi.org/10.3847/2041-8213/ac6736
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2024 EPISTEMUS
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
The magazine acquires the patrimonial rights of the articles only for diffusion without any purpose of profit, without diminishing the own rights of authorship.
The authors are the legitimate owners of the intellectual property rights of their respective articles, and in such quality, by sending their texts they express their desire to collaborate with the Epistemus Magazine, published biannually by the University of Sonora.
Therefore, freely, voluntarily and free of charge, once accepted the article for publication, they give their rights to the University of Sonora for the University of Sonora to edit, publish, distribute and make available through intranets, Internet or CD said work, without any limitation of form or time, as long as it is non-profit and with the express obligation to respect and mention the credit that corresponds to the authors in any use that is made of it.
It is understood that this authorization is not an assignment or transmission of any of your economic rights in favor of the said institution. The University of Sonora guarantees the right to reproduce the contribution by any means in which you are the author, subject to the credit being granted corresponding to the original publication of the contribution in Epistemus.
Unless otherwise indicated, all the contents of the electronic edition are distributed under a license for use and Creative Commons — Attribution-NonCommercial-ShareAlike 4.0 International — (CC BY-NC-SA 4.0) You can consult here the informative version and the legal text of the license. This circumstance must be expressly stated in this way when necessary.
The names and email addresses entered in this journal will be used exclusively for the purposes established in it and will not be provided to third parties or for their use for other purposes.