View source for Anomalous X-ray pulsar

{{Short description|Highly magnetized neutron star}}
{{More footnotes needed|date=March 2025}}
'''Anomalous X-ray pulsars''' ('''AXP'''s) are an observational manifestation of [[magnetar]]s—young, isolated, highly magnetized [[neutron star]]s. These energetic [[X-ray pulsar]]s are characterized by slow rotation periods of ~2–12 seconds and large [[magnetic field]]s of ~10<sup>13</sup>–10<sup>15</sup> [[Gauss (unit)|gauss]] (1 to 100 [[gigatesla]]s). {{As of|2017}}, there were 12 confirmed and 2 candidate AXPs known.<ref>[http://www.physics.mcgill.ca/~pulsar/magnetar/main.html SGR/AXP Online Catalog] (An online catalog of SGR/AXP properties maintained by the pulsar group at McGill University)</ref> The identification of AXPs with magnetars was motivated by their similarity to [[soft gamma repeater]]s.

{|
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|colspan=3| The AXP candidates and their estimated rotation period in seconds, {{as of|2003|lc=on}}, were:
|-
|| [[AXP 1E 2259 plus 586|AXP 1E 2259+586]] || 6.98 || &nbsp; 
|-
|| [[AXP 1E 1048-59]] || 6.45 || &nbsp; 
|-
|| [[AXP 4U 0142 plus 61|AXP 4U 0142+61]] || 8.69 || &nbsp; 
|-
|| [[AXP 1RXS 1708-40]] || 11.0 || &nbsp; 
|-
|| [[AXP 1E 1841-045]] || 11.8 || &nbsp; 
|-
|| [[AXP AXJ1844-0258]] || 6.97 || &nbsp; 
|-
|| [[AXP CXJ0110-7211]] || 5.44 || &nbsp; 
|-
|colspan=3|The second, fourth, and last names have been abbreviated.
|-
|}

== References ==
{{reflist}}

== Sources ==
*{{cite journal| bibcode=1995A&A...299L..41V| title=On the nature of the 'anomalous' 6-s X-ray pulsars| journal=Astronomy and Astrophysics| volume=299| pages=L41| last1=Van Paradijs| first1=J.| last2=Taam| first2=R. E.| last3=Van Den Heuvel| first3=E. P. J.| year=1995}}
*{{cite conference| doi=10.1063/1.50235| chapter=Magnetars| title=AIP Conference Proceedings| volume=366| pages=111| year=1996| last1=Duncan| first1=Robert C.| last2=Thompson| first2=Christopher}}
*{{cite journal| bibcode=2003SciAm.288b..34K| title=Magnetars| journal=Scientific American| volume=288| issue=2| pages=34–41| last1=Kouveliotou| first1=Chryssa| last2=Duncan| first2=Robert C.| last3=Thompson| first3=Christopher| year=2003| doi=10.1038/scientificamerican0203-34| pmid=12561456}}

== External links ==
*[https://web.archive.org/web/20090213124158/http://capca.ucalgary.ca/~bniebergal/webPHP/research.php?subdir=strangeQuarkStars Meissner Effect in Quark Stars] (University of Calgary)

{{Neutron star}}

[[Category:Anomalous X-ray pulsars|*]]