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Masses of the components of SB2 binaries observed with Gaia - III. Accurate SB2 orbits for 10 binaries and masses of HIP 87895
Mazeh, T.; Tal-Or, L.; Halbwachs, J. -L. +9 more
In anticipation of the Gaia astrometric mission, a large sample of spectroscopic binaries has been observed since 2010 with the Spectrographe pour l'Observation des PHénomènes des Intérieurs Stellaires et des Exoplanètes spectrograph at the Haute-Provence Observatory. Our aim is to derive the orbital elements of double-lined spectroscopic binaries…
XMM-Newton discovery of mHz quasi-periodic oscillations in the high-mass X-ray binary IGR J19140+0951
Sidoli, L.; Esposito, P.; Motta, S. E. +2 more
We 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 × 10-12 erg cm-2
The 2015 hard-state only outburst of GS 1354-64
Stiele, H.; Kong, A. K. H.
Since its outburst in 1997, GS 1354-64 stayed in quiescence. In 2015 June, renewed activity of GS 1354-64 was observed. Based on our analysis of energy spectra and timing properties obtained from Swift/X-ray telescope monitoring data, we found that GS 1354-64 stayed in the hard state during the entire outburst. Such a hard state only (or `failed' …
Major substructure in the M31 Outer Halo: the East Cloud
Mackey, A. D.; Martin, N. F.; Ferguson, A. M. N. +8 more
We present the first detailed analysis of the East Cloud, a highly disrupted diffuse stellar substructure in the outer halo of M31. The core of the substructure lies at a projected distance of ∼100 kpc from the centre of M31 in the outer halo, with possible extensions reaching right into the inner halo. Using Pan-Andromeda Archaeological Survey ph…
Chemical compositions and kinematics of the Hercules stream
Lambert, David L.; Reddy, Bacham E.; Ramya, P. +1 more
An abundance analysis is reported of 58-K giants identified by Famaey et al. (2005, A&A, 430, 165) as highly probable members of the Hercules stream selected from stars north of the celestial equator in the Hipparcos catalogue. The giants have compositions spanning the interval [Fe/H] from -0.17 to +0.42 with a mean value of +0.15 and relative…
Cluster mass profile reconstruction with size and flux magnification on the HST STAGES survey
Heymans, Catherine; Joachimi, Benjamin; Heavens, Alan F. +1 more
We present the first measurement of individual cluster mass estimates using weak lensing size and flux magnification. Using data from the HST STAGES (Space Telescope A901/902 Galaxy Evolution Survey) survey of the A901/902 supercluster we detect the four known groups in the supercluster at high significance using magnification alone. We discuss th…
Tracking the energetics of the non-thermal disc-corona-jet in the very high state GX 339 - 4
Done, C.; Kubota, A.
The dramatic hard-soft spectral transition in black hole binaries is important as it is associated with the collapse of the jet and with the strongest low-frequency quasi-periodic oscillations (QPOs). These transition spectra (intermediate and very high state: VHS) are complex, with soft but distinctly non-thermal Comptonization which merges smoot…
Using radio stars to link the Gaia and VLBI reference frames
Malkin, Zinovy
A possible method for linking the optical Gaia Celestial Reference Frame (GCRF) to the VLBI-based International Celestial Reference Frame (ICRF) is to use radio stars in a manner similar to that in the linking of the Hipparcos Celestial Reference Frame (HCRF) to ICRF. In this work, an obtainable accuracy of the orientation angles between GCRF and …
Analysis of a spatially deconvolved solar pore
Ichimoto, K.; Suematsu, Y.; Katsukawa, Y. +3 more
Solar pores are active regions with large magnetic field strengths and apparent simple magnetic configurations. Their properties resemble the ones found for the sunspot umbra although pores do not show penumbra. Therefore, solar pores present themselves as an intriguing phenomenon that is not completely understood. We examine in this work a solar …
Magellan LDSS3 emission confirmation of galaxies hosting metal-rich Lyman α absorption systems
Bowen, David V.; York, Donald G.; Florian, Michael +5 more
Using the Low Dispersion Survey Spectrograph 3 at the Magellan II Clay Telescope, we target candidate absorption host galaxies detected in deep optical imaging (reaching limiting apparent magnitudes of 23.0-26.5 in g, r, I, and z filters) in the fields of three QSOs, each of which shows the presence of high metallicity, high N_{H I} absorption sys…