2011) Soft and hard X-ray emissions from the anomalous X-ray pulsar 4U 0142+61 observed with Suzaku.
The other is Anomalous X-ray Pulsars, peculiar X-ray pulsars without binary evidence, of which several were known from the 1980's.
Another group of neutron stars, called anomalous X-ray pulsars, has also been considered possible magnetars.
This discovery at last establishes a strong link between anomalous X-ray pulsars and soft-gamma-ray repeaters," with both being magnetars, comments Shri Kulkarni of the California Institute of Technology in Pasadena.
In visible light, anomalous X-ray pulsars (AXPs) and other magnetar candidates are so faint that only the world's largest telescopes have any chance to detect them.
The Anomalous X-ray Pulsars Year of Distance AXP Constellation Discovery (light-years) 1E 2259+586 Cassiopeia 1981 10,000 1E 1048-594 Carina 1985 > 10,000 4U 0142+615 Cassiopeia 1993 7,000 RXS 1708-401 Scorpius 1997 ~25,000 1E 1841-045 Scutum 1997 20,000 AX J1845-026 Aquila 1998 ~50,000 CXOU J0110-721 Tucana (SMC) 2002 185,000 XTE J1810-197 Sagittarius 2003 ~20,000 Rotation Period Polar magnetic field AXP (seconds) ([10.
SGRs also appear to be related to anomalous X-ray pulsars
, or AXPs.