A search for signatures of interactions of X-ray binary outflows with their environments with ALMA

Abstract

We observed the X-ray binaries CirX-1, ScoX-1, GRS 1915+105, GX13+1, and CygX-1 with the Atacama Large Millimeter/submillimeter Array (ALMA). Unresolved continuum emission is found at the positions of all the sources at a frequency of 92 GHz, with flux densities ranging between 0.8 and 10 mJy/beam. In all cases the emission can be associated with jets that have been extensively observed at lower frequencies. We searched for line emission from H$\alpha$ recombination, SiO,H2O, and CH3OH at the positions of all the sources and, for CirX-1 and CygX-1, also at regions where shocks associated with an interaction between the jet and the interstellar medium had previously been observed. The search did not yield any significant detection, resulting in 3$\sigma$ upper limits between 0.65 and 3.7 K km s${}^{-1}$ for the existence of line emission in these regions. In contrast, we detected spatially unresolved SiO emission in the field of view of GX13+1, and we tentatively associate this emission with a SiO maser in a potential young stellar object or evolved star. We also found spatially extended line emission at two additional sites in the field of view of GX13+1 that we tentatively associate with emission from SO and CH3OH; we speculate that it may be associated with a star-forming region, but again we cannot rule out alternative origins such as emission from evolved stars.

Accepted for publication in A&A

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