Abstract
AbstractWe present the results from our Suzaku observations of the Galactic black hole binary 4U 1630‐47. 4U 1630‐47 was observed in the very high state (VHS) during the 2012 September–October outburst. The inner disk appears slightly truncated by comparison with a previous high/soft state (HSS) of this source, even by taking into account energetic coupling between the disk and corona. The spectra do not show the Doppler‐shifted emission lines indicating baryonic jets that were seen four days previously in an XMM‐Newton observation, despite the source being in a similar state. There are no significant absorption lines from highly ionized iron ions. We also observed 4U 1630‐47 in the HSS simultaneously with Suzaku and NuSTAR in an early epoch of the 2015 outburst. All Suzaku spectra in the HSS show variable iron‐K absorption line features. We find that the ionization state of the disk wind rapidly increased when the continuum showed significant spectral hardening. This behavior is consistent with that expected from a thermally driven wind. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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