SIDOLI, LaraLaraSIDOLIEsposito, P.P.EspositoMotta, S. E.S. E.MottaISRAEL, Gian LucaGian LucaISRAELRODRIGUEZ CASTILLO, Guillermo AndresGuillermo AndresRODRIGUEZ CASTILLO2020-05-202020-05-2020160035-8711http://hdl.handle.net/20.500.12386/25019We report on the discovery of mHz quasi-periodic oscillations (QPOs) from the high-mass X-ray binary (HMXB) IGR J19140+0951, during a 40 ks XMM-Newton observation performed in 2015, which caught the source in its faintest state ever observed. At the start of the observation, IGR J19140+0951 was at a low flux of 2 × 10<SUP>-12</SUP> erg cm<SUP>-2</SUP> s<SUP>-1</SUP> (2-10 keV; L<SUB>X</SUB> = 3 × 10<SUP>33</SUP> erg s<SUP>-1</SUP> at 3.6 kpc), then its emission rose reaching a flux ∼10 times higher, in a flare-like activity. The investigation of the power spectrum reveals the presence of QPOs, detected only in the second part of the observation, with a strong peak at a frequency of 1.46 ± 0.07 mHz, together with higher harmonics. The X-ray spectrum is highly absorbed (N<SUB>H</SUB> = 10<SUP>23</SUP> cm<SUP>-2</SUP>), well fitted by a power law with a photon index in the range 1.2-1.8. The re-analysis of a Chandra archival observation shows a modulation at ∼0.17 ± 0.05 mHz, very likely the neutron-star spin period (although a QPO cannot be excluded). We discuss the origin of the 1.46 mHz QPO in the framework of both disc-fed and wind-fed HMXBs, favouring the quasi-spherical accretion scenario. The low flux observed by XMM-Newton leads to about three orders of magnitude the source dynamic range, overlapping with the one observed from Supergiant Fast X-ray Transients (SFXTs). However, since its duty cycle is not as low as in SFXTs, IGR J19140+0951 is an intermediate system between persistent supergiant HMXBs and SFXTs, suggesting a smooth transition between these two sub-classes.STAMPAenArticle10.1093/mnras/stw12462-s2.0-84980371823000381711100020https://academic.oup.com/mnras/article/460/4/3637/26091472016MNRAS.460.3637SFIS/05 - ASTRONOMIA E ASTROFISICA