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2010ATel.3060....1K - The Astronomer's Telegram, 3060, 1 (2010/December-0)
Swift detection of an ∼500s period in MAXI J1409-619.
KENNEA J.A., CURRAN P., KRIMM H., ROMANO P., MANGANO V., EVANS P.A., YAMAOKA K. and BURROWS D.N.
Abstract (from CDS):
The XRT PC mode data reveal an enhanced emission state over the previous detection, with a mean flux of 7 x 10^-10 erg/s/cm^2 (0.3-10 keV, uncorrected for absorption), ∼7 times brighter than the flux reported by Swift on October 20th, 2010 (Kennea et al., ATEL#2962).
The PC mode pile-up corrected light-curve reveals a sinusoidal periodicity, not previously detected, with a period of 503 ± 10 s. 4 clear cycles are seen in the second orbit consisting of 1.9ks of PC mode data taken between 16:55 and 17:28UT, with a sinusoidal peak-to-trough modulation of 42% of the mean flux.
RXTE observations taken October 22-23, 2010 (Yamaoka et al, ATEL #2969) reported no detection of this periodicity, and we have analyzed the previous Swift/XRT data using the Lomb-Scargle method and have also found no evidence of this periodicity. Therefore this periodicity is a transient feature, most likely due to the accretion event that triggered BAT. We suggest that this periodicity is the rotation period of the compact object in MAXI J1409-619, most likely a neutron star, and that MAXI J1409-619 is a candidate HMXB system.
Abstract Copyright: ∼
Journal keyword(s): X-ray - Transients
Simbad objects: 1
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