Martin Durant and Marten H. van Kerkwijk 2006 ApJ 652 576 doi:10.1086/507605
Martin Durant1 and Marten H. van Kerkwijk1
Show affiliationsWe have collected data spanning seven years of observations of the magnetar 4U 0142+61 in the infrared, optical, and soft X-rays. These combine our own observations and analysis of archival data. We find that the source is variable in the optical, in contrast to what had been previously reported, that the K-band flux can vary by over a magnitude on the timescale of days, and that the X-ray pulsed flux is not obviously correlated with either the total X-ray flux or infrared and optical fluxes. Furthermore, from multicolor photometry of the source within single nights, we conclude that there are two separate components to the infrared emission. The overall picture is unclear and prompts the need for further, more frequent observations.
Issue 1 (2006 November 20)
Received 2006 May 10, accepted for publication 2006 July 11
Martin Durant and Marten H. van Kerkwijk 2006 ApJ 652 576
Slava G Turyshev et al 2004 Class. Quantum Grav. 21 2773
D H Coule 2001 Class. Quantum Grav. 18 4265
L. Chen et al. 2008 ApJ 680 539
S. O'hira et al 2000 Nucl. Fusion 40 519
P Akueson and D Gurevich 1999 J. Phys. A: Math. Gen. 32 4183
V Vonka et al 1981 J. Phys. E: Sci. Instrum. 14 1336
Poul H Damgaard and Peter E Haagensen 1997 J. Phys. A: Math. Gen. 30 4681
G Bester and M Fähnle 2001 J. Phys.: Condens. Matter 13 11541
Liao Ming-Liang et al 2009 Chinese Phys. Lett. 26 114207