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# Study of the X-ray pulsar IGR J19294+1816 with NuSTAR: detection of cyclotron line and transition to accretion from the cold disc

Tsygankov, Sergey S. and Doroshenko, Victor and Mushtukov, Alexander A. and Lutovinov, Alexander A. and Poutanen, Juri (2018) Study of the X-ray pulsar IGR J19294+1816 with NuSTAR: detection of cyclotron line and transition to accretion from the cold disc. . http://resolver.caltech.edu/CaltechAUTHORS:20181126-132421658

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## Abstract

In the work we present the results of two deep broad-band observations of the poorly studied X-ray pulsar IGR J19294+1816 obtained with the NuSTAR observatory. The source was observed during Type I outburst and in the quiescent state. In the bright state a cyclotron absorption line in the energy spectrum was discovered at $E_{\rm cyc}=42.8\pm0.7$ keV. Spectral and timing analysis prove the ongoing accretion also during the quiescent state of the source. Based on the long-term flux evolution, particularly on the transition of the source to the bright quiescent state with luminosity around $10^{35}$ erg s$^{-1}$, we concluded that IGR J19294+1816 switched to the accretion from the "cold" accretion disc between Type I outbursts. We also report the updated orbital period of the system.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/1811.08912arXivDiscussion Paper
ORCID:
AuthorORCID
Poutanen, Juri0000-0002-0983-0049
Additional Information:This work was supported by the grant 14.W03.31.0021 of the Ministry of Science and Higher Education of the Russian Federation. This research was also supported by the Academy of Finland travel grants 309228 and 317552 (ST, JP) and by the Netherlands Organization for Scientific Research Veni Fellowship (AAM). This work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester. We also express our thanks to the NuSTAR and Swift teams for prompt scheduling and executing our observations.
Group:NuSTAR
Record Number:CaltechAUTHORS:20181126-132421658
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181126-132421658
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91178
Collection:CaltechAUTHORS
Deposited By: Joy Painter
Deposited On:26 Nov 2018 21:34