PSR B1919+21
File:Chart Showing Radio Signal of First Identified Pulsar.jpg Chart on which Jocelyn Bell Burnell first recognised evidence of PSR B1919+21, exhibited at Cambridge University Library | |
| Observation data Epoch J2000 (ICRS) Equinox J2000 (ICRS) | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Characteristics | |
| Evolutionary stage | Pulsar |
| Astrometry | |
| Distance | 1000+2600 −700 ly (300+800 −200[2] pc) |
| Details | |
| Mass | ~1.4 M☉ |
| Radius | ~1.4 × 10−5 R☉ |
| Luminosity | 0.006[3] L☉ |
| Rotation | 1.3373021601895 s[4] |
| Age | 16[3] Myr |
| Other designations | |
| PSR J1921+2153, PSR 1921+2153, PSR B1919+21, PSR 1919+21, WSTB 12W15, CP 1919+21, CP 1919, LGM-1 | |
| Database references | |
| SIMBAD | data |
PSR B1919+21 is a pulsar with a period of 1.3373 seconds[4] and a pulse width of 0.04 seconds. Discovered by Jocelyn Bell Burnell on 28 November 1967, it is the first discovered radio pulsar.[5] The power and regularity of the signals were briefly thought to resemble an extraterrestrial beacon, leading the source to be nicknamed LGM, later LGM-1 (for "little green men").[6]
The original designation of this pulsar was CP 1919, which stands for Cambridge Pulsar at RA Template:RA.[7] It is also known as PSR J1921+2153 and is located in the constellation of Vulpecula.
Discovery
In 1967, a radio signal was detected using the Interplanetary Scintillation Array of the Mullard Radio Astronomy Observatory in Cambridge, UK, by Jocelyn Bell Burnell. The signal had a 1.337302088331-second period (not in 1967, but in 1991) and 0.04-second pulsewidth.[4] It originated at celestial coordinates Template:RA right ascension, +21° declination. It was detected by individual observation of miles of graphical data traces. Due to its almost perfect regularity, it was at first assumed to be spurious noise, but this hypothesis was promptly discarded. The discoverers jokingly named it little green men 1 (LGM-1), considering that it may have originated from an extraterrestrial civilization, but Bell Burnell soon ruled out extraterrestrial life as a source after discovering a similar signal from another part of the sky.[6]
The original signal turned out to be radio emissions from the pulsar CP 1919, and was the first one recognized as such. Bell Burnell noted that other scientists could have discovered pulsars before her, but their observations were either ignored or disregarded. Researchers Thomas Gold and Fred Hoyle identified this astronomical object as a rapidly rotating neutron star immediately upon their announcement.[citation needed]
Before the nature of the signal was determined, the researchers, Bell Burnell and her PhD supervisor Antony Hewish, considered the possibility of extraterrestrial life:[8]
We did not really believe that we had picked up signals from another civilization, but obviously the idea had crossed our minds and we had no proof that it was an entirely natural radio emission. It is an interesting problem – if one thinks one may have detected life elsewhere in the universe[,] how does one announce the results responsibly? Who does one tell first?
Nobel Prize controversy
When Antony Hewish and Martin Ryle received the Nobel Prize in physics in 1974 for their work in radio astronomy and pulsars, Fred Hoyle, Hewish's fellow astronomer, argued that Jocelyn Bell Burnell should have been a co-recipient of the prize.[9]
In 2018, Bell won the $3-Million Breakthrough Prize in Fundamental Physics for her work.[10]
Cultural references
The English post-punk band Joy Division used an image of CP 1919's radio pulses on the cover of their 1979 debut album, Unknown Pleasures.[11][12][13]
German-born British composer Max Richter wrote a piece inspired by the discovery of CP1919 titled Journey (CP1919).[14]
The English indie rock band Arctic Monkeys used a sound based on the pulses in their music video for "Four Out of Five."[15][16][better source needed]
See also
References
- ^ a b Page Module:Citation/CS1/styles.css has no content.Hobbs, G.; Lyne, A. G.; Kramer, M.; Martin, C. E.; Jordan, C. (2004). "Long-term timing observations of 374 pulsars". Monthly Notices of the Royal Astronomical Society. 353 (4): 1311. Bibcode:2004MNRAS.353.1311H. doi:10.1111/j.1365-2966.2004.08157.x.
- ^ Page Module:Citation/CS1/styles.css has no content.Verbiest, J. P. W.; Weisberg, J. M.; Chael, A. A.; Lee, K. J.; Lorimer, D. R. (2012). "On Pulsar Distance Measurements and Their Uncertainties". The Astrophysical Journal. 755 (1): 39. arXiv:1206.0428. Bibcode:2012ApJ...755...39V. doi:10.1088/0004-637X/755/1/39. S2CID 118610470.
- ^ a b Page Module:Citation/CS1/styles.css has no content."The ATNF Pulsar Catalogue". Retrieved 2010-02-11.
- ^ a b c Page Module:Citation/CS1/styles.css has no content.Arzoumanian, Z.; Nice, D. J.; Taylor, J. H.; Thorsett, S. E. (1994). "Timing behavior of 96 radio pulsars". Astrophysical Journal. 422 (2): 671. Bibcode:1994ApJ...422..671A. doi:10.1086/173760.
- ^ Page Module:Citation/CS1/styles.css has no content."Pulsar is 1st observed, November 28, 1967". EDN Network. Retrieved 2013-12-20.
- ^ a b Page Module:Citation/CS1/styles.css has no content."This Month in Physics History: February 1968: Discovery of pulsars announced". www.aps.org.
- ^ Page Module:Citation/CS1/styles.css has no content.Basu, Baidyanath (2003-02-01). An Introduction to Astrophysics. Prentice Hall India Pvt., Limited. p. 325. ISBN 978-81-203-1121-3.
- ^ Page Module:Citation/CS1/styles.css has no content.Burnell, S. Jocelyn Bell (2004-09-21) [1977]. "Little Green Men, White Dwarfs or Pulsars?". Cosmic Search Magazine. Retrieved 2013-07-28. (after-dinner speech given at the Eighth Texas Symposium on Relativistic Astrophysics; first published in Page Module:Citation/CS1/styles.css has no content.Bell Burnell, S. Jocelyn (1977). "Petit Four". Annals of the New York Academy of Sciences. 302: 685–9. Bibcode:1977NYASA.302..685B. doi:10.1111/j.1749-6632.1977.tb37085.x. S2CID 222086632.)
- ^ Page Module:Citation/CS1/styles.css has no content.Judson, Horace Freeland (2003-10-20). "No Nobel Prize for whining". The New York Times.
- ^ Page Module:Citation/CS1/styles.css has no content.Billings, Lee. "Pulsar Discoverer Jocelyn Bell Burnell Wins $3-Million Breakthrough Prize". Scientific American. Retrieved 2021-08-03.
- ^ Page Module:Citation/CS1/styles.css has no content.Capriola, Adam (2011-05-19). "The History of Joy Division's "Unknown Pleasures" Album Art". Adamcap.com. Retrieved 2013-06-28.
- ^ Page Module:Citation/CS1/styles.css has no content."Unknown Pleasures". Joy Division. June 1979. Retrieved 2008-07-05.
- ^ Page Module:Citation/CS1/styles.css has no content.Christiansen, Jen (2015-02-18). "Pop Culture Pulsar: Origin Story of Joy Division's Unknown Pleasures Album Cover". Scientific American. Retrieved 2015-10-04.
- ^ Page Module:Citation/CS1/styles.css has no content."Journey (CP1919) Performed by Aurora Orchestra". 2019-05-16. Archived from the original on 2020-09-21. Retrieved 2019-05-20.
- ^ Page Module:Citation/CS1/styles.css has no content."Arctic Monkeys - Four Out Of Five (Official Video)". YouTube. 13 May 2018. from 0:16-0:45 and 2:57-3:13.
- ^ Page Module:Citation/CS1/styles.css has no content."The Great Silence by LEMMiNO". YouTube. 30 November 2018. from 0:05-1:16
Further reading
- Page Module:Citation/CS1/styles.css has no content.Hewish, A.; Bell, S. J.; Pilkington, J. D. H.; Scott, P. F.; Collins, R. A. (24 February 1968). "Observation of a Rapidly Pulsating Radio Source". Nature. 217 (5130): 709–713. Bibcode:1968Natur.217..709H. doi:10.1038/217709a0. S2CID 4277613.
- Page Module:Citation/CS1/styles.css has no content."K3PGP Experimenter's Corner – Pulsars (List of pulsars for amateur radio astronomers)". K3PGP.org. Archived from the original on 2012-02-10. Retrieved 2008-02-25.
- Page Module:Citation/CS1/styles.css has no content."Pulsar Astrometry with the VLBA (Study of Pulsar Parallax, PSR B1919+21 is one of the pulsars studied)". Cornell University. 2004-01-21.
External links
- Page Module:Citation/CS1/styles.css has no content.Bell, Jon (1996-12-19). "A Tutorial on Radio Pulsars: The discovery of pulsars". Archived from the original on 2012-09-03. Retrieved 2013-06-28.
- Page Module:Citation/CS1/styles.css has no content.Manchester, R. N.; Hobbs, G.; Khoo, J. "Recording of the first-discovered pulsar CP1919 (PSR B1919+21) made at the Parkes radio telescope in April 2012". CSIRO Astronomy & Space Science: Pulsar Group. Archived from the original on 2016-03-10. Retrieved 2013-06-30.
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