Astronomy:PSR J2144-3933
From HandWiki
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Grus |
| Right ascension | 21h 44m 12.10s |
| Declination | −39° 33′ 55.2″ |
| Characteristics | |
| Spectral type | Pulsar |
| Variable type | None |
| Astrometry | |
| Distance | 587.088 ly (180 pc) ly |
| Details | |
| Rotation | 8.51 s |
| Other designations | |
EUVE J2144-39.6 | |
| Database references | |
| SIMBAD | data |
PSR J2144-3933 is a pulsar about 180 parsecs (587.088 light-years) from Earth. It was previously thought to have a period of 2.84 seconds but is now known to have a period of 8.51 seconds, which is among the longest-known radio pulsar.
J2144-3933 is notable for other reasons: its mean pulse profile is very narrow in comparison to the pulse period with a half-intensity width of less than one degree of longitude. It also has the lowest spindown luminosity of any pulsar at about 3×1021 watts.
Writing in Nature, astrophysicists M. D. Young and coworkers consider this object and suggest that its existence throws current theories into doubt. They state:
- Moreover, under the usual model assumptions, based on the neutron-star equations of state, this slowly rotating pulsar should not be emitting a radio beam. Therefore either the model assumptions are wrong, or current theories of radio emission must be revised[1]
References
- ↑ Young, M. D.; Manchester, R. N.; Johnston, S. (26 August 1999). "A radio pulsar with an 8.5-second period that challenges emission models". Nature (400): 848–849. doi:10.1038/23650. Bibcode: 1999Natur.400..848Y. Archived from the original on 29 June 2013. https://archive.is/20130629090115/http://hera.ph1.uni-koeln.de/~heintzma/NS1/sub/J2144-3933.htm.
External links
- http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=PSR+J2144-3933&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
- ""Undead" Star Torpedoes Current Theories". Sciencedaily.com. 26 August 1999. https://www.sciencedaily.com/releases/1999/08/990825183711.htm. Retrieved June 2013.
- Kohler, Susanna (25 March 2011). "A Pulsar Alone: The first deep X-ray and optical observations of the closest isolated radio pulsar". Astrobites.org. http://astrobites.org/2011/03/25/a-pulsar-alone/. Retrieved June 2013.
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