SRG/ART-XC detection of an ongoing activity from X-ray pulsar XTE J1829-098
ATel #14521; A. Shtykovsky(1), S. Molkov(1), A. Semena(1), A. Lutovinov(1), I. Mereminskiy(1) (IKI RAS, Moscow, Russia)
on 7 Apr 2021; 12:13 UT
Credential Certification: Ilya Mereminskiy (i.a.mereminskiy@gmail.com)
Subjects: X-ray, Transient, Pulsar
On Apr 5-6, 2021, during the third SRG all-sky survey, the Mikhail Pavlinsky ART-XC telescope on board the SRG observatory covered the sky field containing the XTE J1829-098 - known X-ray pulsar with period of 7.8s.
The source was detected with the X-ray flux of (3.2±0.3)x10-10 erg cm-2 s-1 in the 4-12 keV energy band (or approx. 23 mCrab). No activity was seen from the source in the first two ART-XC all-sky surveys, with an upper flux limit of about 10-11 erg cm-2 s-1.
Therefore we regard the observed activity as an onset of a new outburst. Note, that typically outbursts of this source are quite short, lasting a few weeks.
The cyclotron resonance scattering feature (CSRF) was detected at ~15 keV in the NuSTAR observations (Shtykovsky et al., 2018) during the previous outburst in August, 2018 (Nakajima et al., 2018,
ATel#11927). Although there is a known NIR counterpart (Halpern and Gotthelf, 2007) for the source, neither the type nor the class of a secondary star has been defined.
We encourage further multiwavelength observations of the source.
ART-XC is the X-ray telescope on board the SRG observatory which
was launched from the Baikonur cosmodrome on 13 July 2019 by the Proton
rocket. ART-XC has been renamed 'Mikhail Pavlinsky ART-XC telescope'
in honor of its first PI, Dr. Mikhail Pavlinsky.
