MAXI GSC detection of a renewed X-ray activity from Be X-ray binary pulsar XTE J1858+034
ATel #3766; T. Sootome, T. Mihara, M. Matsuoka, M. Sugizaki, T. Yamamoto, M. Serino, S. Nakahira (RIKEN), M. Nakajima, H. Negoro, F. Suwa, M. Asada, H. Sakakibara (Nihon U.), S. Ueno, H. Tomida, M. Kohama, M. Ishikawa (JAXA), N. Kawai, M. Morii, K. Sugimori, R. Usui, T. Toizumi, Y. Aoki, S. Song (Tokyo Tech), A. Yoshida, K. Yamaoka (AGU), H. Tsunemi, M. Kimura, H. Kitayama (Osaka U.), Y. Ueda, K. Hiroi, M. Shidatsu (Kyoto U.), Y. Tsuboi, T. Matsumura, K. Yamazaki (Chuo U.), M. Yamauchi, Y. Nishimura, T. Hanayama (Miyazaki U.) report on behalf of the MAXI team
on 15 Nov 2011; 13:28 UT
Credential Certification: Tatehiro Mihara (mihara@crab.riken.jp)
Subjects: X-ray, Binary, Neutron Star, Transient, Pulsar
We report on the renewed X-ray activity of a Be/X-ray binary pulsar,
XTE J1858+034 observed with MAXI/GSC. The source flux in 4-10 keV band
was 12 ± 5 mCrab in one-day average on 2011 November 6 (MJD 55871),
and slowly increased up to 24 ± 5 mCrab on November 15 (MJD 55880).
The flux in 2-4 keV has been <10 mCrab at the 1-sigma upper limit for
these period, which indicates that the source is moderately
absorbed. XTE J1858+034 was discovered in 1998 February (IAUC
6826 :2), and have ever had two more outbursts in 2004 April (ATel
#274) and 2010 September (ATel #2846). Thus, the current activity is
the fourth outburst that has ever detected. The MAXI/GSC light curve
in 2010 outburst showed a peak flux of 30 mCrab on 2010 September 19 (MJD
55458). The current outburst has a similar intensity. The latest source
flux can be checked at the following page;
http://maxi.riken.jp/top/index.php?cid=1&jname=J1858+034
