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Advances in Understanding High-Mass X-ray Binaries with INTEGRALand Future Directions
Torres, Diego F.; Li, Jian; Rothschild, Richard E. +48 more
High mass X-ray binaries are among the brightest X-ray sources in the Milky Way, as well as in nearby Galaxies. Thanks to their highly variable emissions and complex phenomenology, they have attracted the interest of the high energy astrophysical community since the dawn of X-ray Astronomy. In more recent years, they have challenged our comprehens…
A new weak-field magnetic DA white dwarf in the local 20 pc volume. The frequency of magnetic fields in DA stars
Bagnulo, S.; Landstreet, J. D.
We report the discovery of a new magnetic DA white dwarf (WD), WD 0011 - 721, which is located within the very important 20 pc volume-limited sample of the closest WDs to the Sun. This star has a mean field modulus ⟨|B|⟩ of 343 kG, and from the polarisation signal we deduce a line-of-sight field component of 75 kG. The magnetic field is sufficient…
Deep Chandra Survey of the Small Magellanic Cloud. III. Formation Efficiency of High-mass X-Ray Binaries
Williams, Benjamin F.; Zezas, Andreas; Drake, Jeremy J. +12 more
We have compiled the most complete census of high-mass X-ray binaries (HMXBs) in the Small Magellanic Cloud with the aim to investigate the formation efficiency of young accreting binaries in its low-metallicity environment. In total, we use 123 X-ray sources with detections in our Chandra X-ray Visionary Program (XVP), supplemented by 14 addition…
Characterising the surface magnetic fields of T Tauri stars with high-resolution near-infrared spectroscopy
Hussain, G. A. J.; Kochukhov, O.; Lavail, A.
Aims: In this paper, we aim to characterise the surface magnetic fields of a sample of eight T Tauri stars from high-resolution near-infrared spectroscopy. Some stars in our sample are known to be magnetic from previous spectroscopic or spectropolarimetric studies. Our goals are firstly to apply Zeeman broadening modelling to T Tauri stars wi…
Globular cluster candidates in the Galactic bulge: Gaia and VVV view of the latest discoveries
Minniti, D.; Rejkuba, M.; Zoccali, M. +7 more
Context. Thanks to the recent wide-area photometric surveys, the number of star cluster candidates have risen exponentially in the last few years. Most detections, however, are based only on the presence of an overdensity of stars in a given region or an overdensity of variable stars, regardless of their distance. As candidates, their detection ha…
Characterizing K2 Candidate Planetary Systems Orbiting Low-mass Stars. IV. Updated Properties for 86 Cool Dwarfs Observed during Campaigns 1-17
Vanderburg, Andrew; Schlieder, Joshua E.; Crepp, Justin R. +15 more
We present revised stellar properties for 172 K2 target stars that were identified as possible hosts of transiting planets during Campaigns 1-17. Using medium-resolution near-infrared spectra acquired with the NASA Infrared Telescope Facility/SpeX and Palomar/TripleSpec, we found that 86 of our targets were bona fide cool dwarfs, 74 were hotter dw…
Latitudinal variation in the abundance of methane (CH4) above the clouds in Neptune's atmosphere from VLT/MUSE Narrow Field Mode Observations
Bacon, Roland; Fletcher, Leigh N.; Irwin, Patrick G. J. +5 more
Observations of Neptune, made in 2018 using the new Narrow Field Adaptive Optics mode of the Multi Unit Spectroscopic Explorer (MUSE) instrument at the Very Large Telescope (VLT) from 0.48 to 0.93 µm, are analysed here to determine the latitudinal and vertical distribution of cloud opacity and methane abundance in Neptune's observable tropos…
Spatial distribution of stellar mass and star formation activity at 0.2 < z < 1.2 across and along the main sequence
Popesso, P.; Oesch, P. A.; Illingworth, G. D. +5 more
High-resolution multi-wavelength photometry is crucial to explore the spatial distribution of star formation in galaxies and understand how these evolve. To this aim, in this paper we exploit the deep, multi-wavelength Hubble Space Telescope (HST) data available in the central parts of the Great Observatories Origins Deep Survey (GOODS) fields and…
Extreme starlight polarization in a region with highly polarized dust emission
Tassis, Konstantinos; Hensley, Brandon S.; Blinov, Dmitry +2 more
Context. Galactic dust emission is polarized at unexpectedly high levels, as revealed by Planck.
Aims: The origin of the observed ≃20% polarization fractions can be identified by characterizing the properties of optical starlight polarization in a region with maximally polarized dust emission.
Methods: We measure the R-band linear polari…
Filling in the Quasar Redshift Gap at z ∼ 5.5. II. A Complete Survey of Luminous Quasars in the Post-reionization Universe
Fan, Xiaohui; Jiang, Linhua; McGreer, Ian D. +10 more
We present the final results from our survey of luminous z ∼ 5.5 quasars. This is the first systematic quasar survey focusing on quasars at z ∼ 5.5, during the post-reionization epoch. It has been challenging to select quasars at 5.3 < z < 5.7 using conventional color selections, due to their similar optical colors to those of late-type star…