Quiescent NIR and optical counterparts to candidate black hole X-ray binaries. Issue 2 (16th October 2018)

• Record Type: Journal Article
• Authors: López, K M; Jonker, P G; Torres, M A P; Heida, M; Rau, A; Steeghs, D
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 482:Issue 2(2019)
• Page Start: 2149
• Page End: 2165
• Publication Date: 2018-10-16
• Subjects: stars: black holes -- infrared: stars -- X-rays: individual: XTE J1818−245; IGR J17451−3022; XTE J1726−476; XTE J2012+381; XTE J1752−223; MAXI J1543−564; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/sty2793
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We present near-infrared and optical imaging of 15 candidate black hole X-ray binaries. In addition to quiescent observations for all sources, we also observed two of these sources (IGR J17451−3022 and XTE J1818−245) in outburst. We detect the quiescent counterpart for 12 out of 15 sources, and for the remaining 3, we report limiting magnitudes. The magnitudes of the detected counterparts range between K s = 17.59 and K s = 22.29 mag. We provide (limits on) the absolute magnitudes and finding charts of all sources. Of these 12 detections in quiescence, 7 detections represent the first quiescent reported values (for MAXI J1543−564, XTE J1726−476, IGR J17451−3022, XTE J1818−245, MAXI J1828−249, MAXI J1836−194, Swift J1910.2−0546), and 2 detections show fainter counterparts to XTE J1752−223 and XTE J2012+381 than previously reported. We used theoretical arguments and observed trends, for instance between the outburst and quiescent X-ray luminosity and orbital period P orb to derive an expected trend between Δ K s and P orb of$\Delta K_{\rm s} \propto \log P_{\rm orb}^{0.565}$ . Comparing this to observations, we find a different behaviour. We discuss possible explanations for this result.