“PSR J1748-2446ad”的意思、由来-开放百科全书

词条	PSR J1748-2446ad
释义	References External links {{Starbox begin \| name=PSR J1748-2446ad}}{{Starbox image \| image = \| caption = The location of PSR J1748-2446ad in the night sky. The pulsar is located in the center of the yellow square. It is too faint in this image to be visible against the background. \| credit = GALEX GR6/7 Data Release }}{{Starbox observe \| epoch=J2000 \| ra= {{RA\|17\|48\|04.9}} \| dec= {{DEC\|−24\|46\|04}} \| appmag_v=5.28 \| constell= Sagittarius }}{{Starbox character \| class=Pulsar \| b-v=? \| u-b=? \| variable=None }} \|-	Astrometry \|- style="vertical-align: top;" \| Distance \| 18,000 Ly ^[1]{{Starbox detail \| mass=1.4 \| radius_km= 17 \| luminosity=? \| temperature=? \| metal=? \| rotation=0.00139595482(6) s \| age=? }}{{Starbox reference \|{{Starbox end}} PSR J1748-2446ad is the fastest-spinning pulsar known, at 716 Hz,^[2] or 716 times per second. This pulsar was discovered by Jason W. T. Hessels of McGill University on November 10, 2004 and confirmed on January 8, 2005. It has been calculated that the neutron star contains slightly less than two times the mass of the Sun, within the typical range of neutron stars. Its radius is constrained to be less than 16 km. At its equator it is spinning at approximately 24% of the speed of light, or over 70,000 km per second. The pulsar is located in a globular cluster of stars called Terzan 5, located approximately 18,000 light-years from Earth in the constellation Sagittarius. It is part of a binary system and undergoes regular eclipses with an eclipse magnitude of about 40%. Its orbit is highly circular with a 26-hour period. The other object is about 0.14 solar masses, with a radius of 5–6 solar radii. Hessels states that the companion may be a "bloated main-sequence star, possibly still filling its Roche Lobe". Hessels goes on to speculate that gravitational radiation from the pulsar might be detectable by LIGO. References 1. ^{{cite journal \|doi=10.1051/0004-6361:20066628 \|title=Distances of the bulge globular clusters Terzan 5, Liller 1, UKS 1, and Terzan 4 based on HST NICMOS photometry \|date=2007 \|author=Ortolani, S. \|journal=Astronomy and Astrophysics \|volume=470 \|pages=1043–1049 \|last2=Barbuy \|first2=B. \|last3=Bica \|first3=E. \|last4=Zoccali \|first4=M. \|last5=Renzini \|first5=A. \|bibcode=2007A&A...470.1043O \|issue=3\|arxiv=0705.4030}} 2. ^{{Cite journal \| last1 = Hessels \| first1 = J. W. T. \| last2 = Ransom \| first2 = S. M. \| last3 = Stairs \| first3 = I. H. \| last4 = Freire \| first4 = P. C. \| last5 = Kaspi \| first5 = V. M. \| last6 = Camilo \| first6 = F. \| title = A Radio Pulsar Spinning at 716 Hz \| doi = 10.1126/science.1123430 \| journal = Science \| volume = 311 \| issue = 5769 \| pages = 1901–1904 \| year = 2006 \| pmid = 16410486\| pmc = \|arxiv = astro-ph/0601337 \|bibcode = 2006Sci...311.1901H }} External links XTE J1739-285, Integral points to the fastest spinning neutron star, http://www.spaceref.com/news/viewpr.html?pid=21909 {{Stars of Sagittarius}} 2 : Millisecond pulsars\|Sagittarius (constellation)
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词条

PSR J1748-2446ad

释义

References
External links

{{Starbox begin
| name=PSR J1748-2446ad}}{{Starbox image
| image =
| caption = The location of PSR J1748-2446ad in the night sky. The pulsar is located in the center of the yellow square. It is too faint in this image to be visible against the background.
| credit = GALEX GR6/7 Data Release
}}{{Starbox observe
| epoch=J2000
| ra= {{RA|17|48|04.9}}
| dec= {{DEC|−24|46|04}}
| appmag_v=5.28
| constell= Sagittarius }}{{Starbox character
| class=Pulsar
| b-v=?
| u-b=?
| variable=None }}
|-

Astrometry
|- style="vertical-align: top;"
| Distance
| 18,000 Ly ^[1]{{Starbox detail
| mass=1.4
| radius_km= 17
| luminosity=?
| temperature=?
| metal=?
| rotation=0.00139595482(6) s
| age=? }}{{Starbox reference |{{Starbox end}}

PSR J1748-2446ad is the fastest-spinning pulsar known, at 716 Hz,^[2] or 716 times per second. This pulsar was discovered by Jason W. T. Hessels of McGill University on November 10, 2004 and confirmed on January 8, 2005.

It has been calculated that the neutron star contains slightly less than two times the mass of the Sun, within the typical range of neutron stars. Its radius is constrained to be less than 16 km. At its equator it is spinning at approximately 24% of the speed of light, or over 70,000 km per second.

The pulsar is located in a globular cluster of stars called Terzan 5, located approximately 18,000 light-years from Earth in the constellation Sagittarius. It is part of a binary system and undergoes regular eclipses with an eclipse magnitude of about 40%. Its orbit is highly circular with a 26-hour period. The other object is about 0.14 solar masses, with a radius of 5–6 solar radii. Hessels states that the companion may be a "bloated main-sequence star, possibly still filling its Roche Lobe". Hessels goes on to speculate that gravitational radiation from the pulsar might be detectable by LIGO.

References

1. ^{{cite journal |doi=10.1051/0004-6361:20066628 |title=Distances of the bulge globular clusters Terzan 5, Liller 1, UKS 1, and Terzan 4 based on HST NICMOS photometry |date=2007 |author=Ortolani, S. |journal=Astronomy and Astrophysics |volume=470 |pages=1043–1049 |last2=Barbuy |first2=B. |last3=Bica |first3=E. |last4=Zoccali |first4=M. |last5=Renzini |first5=A. |bibcode=2007A&A...470.1043O |issue=3|arxiv=0705.4030}}
2. ^{{Cite journal | last1 = Hessels | first1 = J. W. T. | last2 = Ransom | first2 = S. M. | last3 = Stairs | first3 = I. H. | last4 = Freire | first4 = P. C. | last5 = Kaspi | first5 = V. M. | last6 = Camilo | first6 = F. | title = A Radio Pulsar Spinning at 716 Hz | doi = 10.1126/science.1123430 | journal = Science | volume = 311 | issue = 5769 | pages = 1901–1904 | year = 2006 | pmid = 16410486| pmc = |arxiv = astro-ph/0601337 |bibcode = 2006Sci...311.1901H }}

External links

XTE J1739-285, Integral points to the fastest spinning neutron star, http://www.spaceref.com/news/viewpr.html?pid=21909

2 : Millisecond pulsars|Sagittarius (constellation)

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