Discovery of Cyclotron line from GX 304-1 during the Brightest Outburst in August 2010, observed by MAXI/GSC, Suzaku, and RXTE.

Details Discovery of Cyclotron line from GX 304-1 during the Brightest Outburst in August 2010, observed by MAXI/GSC, Suzaku, and RXTE. Discovery of Cyclotron line from GX 304-1 during the Brightest Outburst in August 2010, observed by MAXI/GSC, Suzaku, and RXTE.

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010fym..confp..13y&link_type=abstract

"The First Year of MAXI: Monitoring Variable X-ray Sources", Poster Presentations, 4th International MAXI Workshop held November

Physics

Scientific paper

GX 304-1 is a classical Be/X-ray binary pulsar with a 272-second period, discovered by high energy X-ray balloon observations in 1967. Transient outburst activities by 132-day interval had been frequently observed during 1970s. Since 1980s, the source had been in a quiescent state and no significant X-ray flux had been detected for 28 years until the outburst detection by INTEGRAL in June, 2008(ATel #1613). It suggested that the source might return to the active phase by 2008. MAXI/GSC has detected outbursts from GX 304-1 three times every 132-day interval during the first one-year operation since August 2009. The third outburst in August 2010 reached a flux of 700 mCrab in a 4-10 keV band, which is the brightest among the outbursts ever observed from this source. We conducted the follow-up observation by Suzaku and RXTE, then discovered the cyclotron line at around 51 keV as reported in ATel #2796. We present the change of the spectral shape and the pulsation period during the outburst obtained from the MAXI/GSC, Suzaku and RXTE data, then discuss about the physical condition of magnetic field on the neutron star.

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