Search Publications
Interstellar Gas-phase Element Depletions in the Small Magellanic Cloud: A Guide to Correcting for Dust in QSO Absorption Line Systems
Jenkins, Edward B.; Wallerstein, George
We present data on the gas-phase abundances for 9 different elements in the interstellar medium of the Small Magellanic Cloud (SMC), based on the strengths of ultraviolet absorption features over relevant velocities in the spectra of 18 stars within the SMC. From this information and the total abundances defined by the element fractions in young s…
Rapid precipitation of radiation belt electrons induced by EMIC rising tone emissions localized in longitude inside and outside the plasmapause
Omura, Yoshiharu; Kubota, Yuko
By performing test particle simulations of relativistic electrons scattered by electromagnetic ion cyclotron (EMIC) rising tone emissions, we find a nonlinear scattering process named SLPA (Scattering at Low Pitch Angle) totally different from the nonlinear wave trapping. The nonlinear wave trapping, occurring for high pitch angles away from the l…
A 2500 deg2 CMB Lensing Map from Combined South Pole Telescope and Planck Data
Bleem, L. E.; Stark, A. A.; George, E. M. +44 more
We present a cosmic microwave background (CMB) lensing map produced from a linear combination of South Pole Telescope (SPT) and Planck temperature data. The 150 GHz temperature data from the 2500 deg2 SPT-SZ survey is combined with the Planck 143 GHz data in harmonic space to obtain a temperature map that has a broader ℓ coverage and le…
QUIJOTE scientific results - II. Polarisation measurements of the microwave emission in the Galactic molecular complexes W43 and W47 and supernova remnant W44
Lasenby, A.; Martínez-González, E.; Rebolo, R. +11 more
We present Q-U-I JOint TEnerife (QUIJOTE) intensity and polarisation maps at 10-20 GHz covering a region along the Galactic plane 24° ≲ l ≲ 45°, |b| ≲ 8°. These maps result from 210 h of data, have a sensitivity in polarisation of ≈40 µK beam-1 and an angular resolution of ≈1°. Our intensity data are crucial to confirm the presenc…
The Gaia DR1 mass-radius relation for white dwarfs
Gänsicke, B. T.; Jordan, S.; Tremblay, P. -E. +9 more
The Gaia Data Release 1 (DR1) sample of white dwarf parallaxes is presented, including six directly observed degenerates and 46 white dwarfs in wide binaries. This data set is combined with spectroscopic atmospheric parameters to study the white dwarf mass-radius relationship (MRR). Gaia parallaxes and G magnitudes are used to derive model atmosph…
Neutral Carbon Emission in Luminous Infrared Galaxies: The [C I] Lines as Total Molecular Gas Tracers
Gao, Yu; Zhang, Zhi-Yu; Zhu, Ming +3 more
We present a statistical study of the [C I] (3P1 \to 3P0), [C I] (3P2 \to 3P1) lines (hereafter [C I] (1-0) and [C I] (2-1), respectively) and the CO(1-0) line for a sample of (ultra-)luminous infrared galaxies ((U)LIRGs). We explore the correlations between th…
KMOS3D Reveals Low-level Star Formation Activity in Massive Quiescent Galaxies at 0.7 < z < 2.7
Übler, Hannah; van Dokkum, Pieter; Bender, Ralf +23 more
We explore the Hα emission in the massive quiescent galaxies observed by the KMOS3D survey at 0.7 < z < 2.7. The Hα line is robustly detected in 20 out of 120 UVJ-selected quiescent galaxies, and we classify the emission mechanism using the Hα line width and the [N II]/Hα line ratio. We find that AGNs are likely to be responsible …
The HST large programme on ω Centauri - I. Multiple stellar populations at the bottom of the main sequence probed in NIR-Optical
Apai, D.; Anderson, J.; Milone, A. P. +7 more
As part of a large investigation with Hubble Space Telescope to study the faintest stars within the globular cluster ω Centauri, in this work we present early results on the multiplicity of its main sequence (MS) stars, based on deep optical and near-infrared observations. By using appropriate colour-magnitude diagrams, we have identified, for the…
Evidence for Dynamically Driven Formation of the GW170817 Neutron Star Binary in NGC 4993
Benoit-Lévy, A.; Bechtol, K.; Smith, M. +89 more
We present a study of NGC 4993, the host galaxy of the GW170817 gravitational-wave event, the GRB 170817A short gamma-ray burst (sGRB), and the AT 2017gfo kilonova. We use Dark Energy Camera imaging, AAT spectra, and publicly available data, relating our findings to binary neutron star (BNS) formation scenarios and merger delay timescales. NGC 499…
Comparative analysis of Debrecen sunspot catalogues
Ludmány, A.; Baranyi, T.; Győri, L.
Sunspot area data are important for studying solar activity and its long-term variations. At the Debrecen Heliophysical Observatory, we compiled three sunspot catalogues: the Debrecen Photoheliographic Data (DPD), the SDO/HMI Debrecen Data (HMIDD) and the SOHO/MDI Debrecen Data. For comparison, we also compiled an additional sunspot catalogue, the…