Search Publications
Missions
Journals
Publication Years
Ubiquitous [O II] Emission in Quiescent Galaxies at z ≈ 0.85 from the LEGA-C Survey
Bell, Eric F.; Maseda, Michael V.; D'Eugenio, Francesco +12 more
Using deep rest-frame optical spectroscopy from the Large Early Galaxy Astrophysical Census (LEGA-C) survey, conducted using VIMOS on the ESO Very Large Telescope, we search for low-ionization [O II] λ λ 3726,3729 emission in the spectra of a mass-complete sample of z ≈ 0.85 galaxies. We find that 59% of UVJ-quiescent (i.e., non-star-forming) gala…
Stellar Dynamical Models for 797 z 0.8 Galaxies from LEGA-C
Bell, Eric F.; Maseda, Michael V.; Franx, Marijn +12 more
We present spatially resolved stellar kinematics for 797 z = 0.6-1 galaxies selected from the LEGA-C survey and construct axisymmetric Jeans models to quantify their dynamical mass and degree of rotational support. The survey is K s -band selected, irrespective of color or morphological type, and allows for a first assessment of the st…
Extreme r-process Enhanced Stars at High Metallicity in Fornax
Hansen, C. J.; Reichert, M.; Arcones, A.
We present and discuss three extremely r-process enhanced stars located in the massive dwarf spheroidal galaxy Fornax. These stars are very unique with an extreme Eu enrichment (1.25 ≤ [Eu/Fe]≤1.45) at high metallicities (-1.3 ≤ [Fe/H]≤-0.8). They have the largest Eu abundances ever observed in a dwarf galaxy opening new opportunities to further u…
Constraining the shear acceleration model for the X-ray emission of large-scale extragalactic jets
Tavecchio, F.
The nature of the intense X-ray emission from powerful extragalactic jets at large (>1 kpc) scale is still debated. The scenario that invokes the inverse Compton scattering of the cosmic microwave background by electrons is challenged by the lack of gamma-ray emission in the GeV band. An alternative assumes synchrotron emission by a distinct po…
Analysis of apsidal motion in eclipsing binaries using TESS data. I. A test of gravitational theories
Ribas, I.; Anglada-Escudé, G.; Morales, J. C. +3 more
Context. The change in the argument of periastron of eclipsing binaries, that is, the apsidal motion caused by classical and relativistic effects, can be measured from variations in the difference between the time of minimum light of the primary and secondary eclipses. Poor apsidal motion rate determinations and large uncertainties in the classica…
A KMOS survey of the nuclear disk of the Milky Way. I. Survey design and metallicities
Schultheis, M.; Prieto, M. A.; Fritz, T. K. +7 more
Context. In the central few degrees of the bulge of the Milky Way there is a flattened structure of gas, dust, and stars, known as the central molecular zone, that is similar to nuclear disks in other galaxies. As a result of extreme foreground extinction, we possess only sparse information about the (mostly old) stellar population of the nuclear …
AGN Triality of Triple Mergers: Detection of Faint X-Ray Point Sources
Gültekin, Kayhan; Runnoe, Jessie C.; Foord, Adi +1 more
We present results from our X-ray analysis of a systematic search for triple active galactic nuclei (AGNs) in nearby (z < 0.077) triple galaxy mergers. We analyze archival Chandra observations of seven triple galaxy mergers with BAYMAX (Bayesian Analysis of Multiple AGNs in X-rays), fitting each observation with single, dual, and triple X-ray p…
The dipper population of Taurus seen with K2
Cody, Ann Marie; Rebull, Luisa M.; Roggero, Noemi +1 more
Context. Dippers are typically low-mass, pre-main-sequence stars that display dips in their light curves. These dips have been attributed to dusty warps that form in the inner part of the disk.
Aims: Our goal is to derive the characteristics of dipper stars in Taurus to assess the physical mechanisms that induce dipper light curves.
Meth…
Double Image Polarimeter—Ultra Fast: Simultaneous Three-color (BV R) Polarimeter with Electron-multiplying Charge-coupled Devices
Piirola, Vilppu; Poutanen, Juri; Berdyugin, Andrei V. +2 more
We describe a new instrument capable of high-precision (10-5) polarimetric observations simultaneously in three passbands (BVR). The instrument utilizes electron-multiplying charge-coupled device (EM CCD) cameras for high efficiency and fast image readout. The key features of the Double Image Polarimeter—Ultra Fast (DIPol-UF) are: (i) t…
A transit timing variation observed for the long-period extremely low-density exoplanet HIP 41378 f
Triaud, Amaury H. M. J.; Wheatley, Peter J.; Bayliss, Daniel +47 more
HIP 41378 f is a temperate 9.2 ± 0.1 R⊕ planet with period of 542.08 d and an extremely low density of 0.09 ± 0.02 g cm-3. It transits the bright star HIP 41378 (V = 8.93), making it an exciting target for atmospheric characterization including transmission spectroscopy. HIP 41378 was monitored photometrically between the dat…