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Their location and age are not easily explained by current star formation models, and in several scenarios the presence of an intermediate-mass black hole (IMBH) has been invoked.<\/jats:p>\n<jats:p><jats:italic>Aims.<\/jats:italic> We use GRAVITY astrometric and SINFONI, KECK, and GNIRS spectroscopic data of S2, the best known S-star, to investigate whether a second massive object could be present deep in the Galactic Centre (GC) in the form of an IMBH binary companion to Sgr A<jats:sup>*<\/jats:sup>.<\/jats:p>\n<jats:p><jats:italic>Methods.<\/jats:italic> To solve the three-body problem, we used a post-Newtonian framework and consider two types of settings: (i) a hierarchical set-up where the star S2 orbits the Sgr A<jats:sup>*<\/jats:sup>\u2013IMBH binary and (ii) a non-hierarchical set-up where the IMBH trajectory lies outside the S2 orbit. In both cases we explore the full 20-dimensional parameter space by employing a Bayesian dynamic nested sampling method.<\/jats:p>\n<jats:p><jats:italic>Results.<\/jats:italic> For the hierarchical case we find the strongest constraints: IMBH masses &gt; 2000 <jats:italic>M<\/jats:italic><jats:sub>\u2299<\/jats:sub> on orbits with smaller semi-major axes than S2 are largely excluded. For the non-hierarchical case, the chaotic nature of the problem becomes significant: the parameter space contains several pockets of valid IMBH solutions. However, a closer analysis of their impact on the resident stars reveals that IMBHs on semi-major axes larger than S2 tend to disrupt the S-star cluster in less than a million years. This makes the existence of an IMBH among the S-stars highly unlikely.<\/jats:p>\n<jats:p><jats:italic>Conclusions.<\/jats:italic> The current S2 data do not formally require the presence of an IMBH. If an IMBH hides in the GC, it has to be either a low-mass IMBH inside the S2 orbit that moves on a short and significantly inclined trajectory or an IMBH with a semi-major axis &gt; 1\u2033. We provide the parameter maps of valid IMBH solutions in the GC and discuss the general structure of our results and how future observations can help to put even stronger constraints on the properties of IMBHs in the GC.<\/jats:p>","DOI":"10.1051\/0004-6361\/202245132","type":"journal-article","created":{"date-parts":[[2023,2,28]],"date-time":"2023-02-28T19:53:36Z","timestamp":1677614016000},"page":"A63","source":"Crossref","is-referenced-by-count":29,"title":["Where intermediate-mass black holes could hide in the Galactic Centre"],"prefix":"10.1051","volume":"672","author":[{"name":"Gravity Collaboration","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5755-0677","authenticated-orcid":false,"given":"O.","family":"Straub","sequence":"additional","affiliation":[]},{"given":"M.","family":"Baub\u00f6ck","sequence":"additional","affiliation":[]},{"given":"R.","family":"Abuter","sequence":"additional","affiliation":[]},{"given":"N.","family":"Aimar","sequence":"additional","affiliation":[]},{"given":"P.","family":"Amaro Seoane","sequence":"additional","affiliation":[]},{"given":"A.","family":"Amorim","sequence":"additional","affiliation":[]},{"given":"J. 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