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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…
A Measurement of Radius Inflation in the Pleiades and Its Relation to Rotation and Lithium Depletion
Stassun, Keivan G.; Somers, Garrett
Precise measurements of eclipsing binary parameters and statistical studies of young clusters have suggested that some magnetically active low-mass dwarfs possess radii inflated by ∼5%-15% relative to theoretical expectations. If true, this effect should be pronounced in young open clusters, due to the rapid rotation and strong magnetic activity o…
Probing the Hot X-Ray Corona around the Massive Spiral Galaxy, NGC 6753, Using Deep XMM-Newton Observations
Vogelsberger, Mark; Springel, Volker; Hernquist, Lars +4 more
X-ray emitting gaseous coronae around massive galaxies are a basic prediction of galaxy formation models. Although the coronae around spiral galaxies offer a fundamental test of these models, observational constraints on their characteristics are still scarce. While the presence of extended hot coronae has been established around a handful of mass…
Mass distribution in the core of MACS J1206. Robust modeling from an exceptionally large sample of central multiple images
Zitrin, A.; Grillo, C.; Tozzi, P. +25 more
We present a new strong lensing analysis of the galaxy cluster MACS J1206.2-0847 (MACS 1206), at z = 0.44, using deep spectroscopy from CLASH-VLT and VLT/MUSE archival data in combination with imaging from the Cluster Lensing and Supernova survey with Hubble. MUSE observations enable the spectroscopic identification of 23 new multiply imaged sourc…
Revealing the ultrafast outflow in IRAS 13224-3809 through spectral variability
Fabian, A. C.; Reynolds, C. S.; Pinto, C. +6 more
We present an analysis of the long-term X-ray variability of the extreme narrow-line Seyfert 1 galaxy IRAS 13224-3809 using principal component analysis (PCA) and fractional excess variability (Fvar) spectra to identify model-independent spectral components. We identify a series of variability peaks in both the first PCA component and F…
Nature of the absorbing gas associated with a galaxy group at z∼0.4
Pettini, Max; York, Donald G.; Husemann, Bernd +6 more
We present new Multi Unit Spectroscopic Explorer observations of quasar field Q2131-1207 with a log N(H I} = 19.50 ± 0.15 sub-damped Lyman α at zabs = 0.42980. We detect four galaxies at a redshift consistent with that of the absorber where only one was known before this study. Two of these are star-forming galaxies, while the ones furt…
The metallicity of the intracluster medium over cosmic time: further evidence for early enrichment
Allen, Steven W.; Simionescu, Aurora; Werner, Norbert +4 more
We use Chandra X-ray data to measure the metallicity of the intracluster medium (ICM) in 245 massive galaxy clusters selected from X-ray and Sunyaev-Zel'dovich (SZ) effect surveys, spanning redshifts 0 < z < 1.2. Metallicities were measured in three different radial ranges, spanning cluster cores through their outskirts. We explore trends in…