Search Publications
H0LiCOW - II. Spectroscopic survey and galaxy-group identification of the strong gravitational lens system HE 0435-1223
Treu, T.; Auger, M. W.; Koopmans, L. V. E. +15 more
Galaxies located in the environment or along the line of sight towards gravitational lenses can significantly affect lensing observables, and can lead to systematic errors on the measurement of H0 from the time-delay technique. We present the results of a systematic spectroscopic identification of the galaxies in the field of view of th…
Gaia Data Release 1. The photometric data
Gilmore, G.; Harrison, D. L.; Evans, N. W. +91 more
Context. This paper presents an overview of the photometric data that are part of the first Gaia data release.
Aims: The principles of the processing and the main characteristics of the Gaia photometric data are presented.
Methods: The calibration strategy is outlined briefly and the main properties of the resulting photometry are presen…
The geological history of Northeast Syrtis Major, Mars
Mustard, John F.; Bramble, Michael S.; Salvatore, Mark R.
As inferred from orbital spectroscopic data, Northeast Syrtis Major bears considerable mineral diversity that spans the Noachian-Hesperian boundary despite its small geographic area. In this study we use observations from the High Resolution Imaging Science Experiment, supplemented with Context Camera imagery, to characterize and map the lateral e…
Galactic-scale Feedback Observed in the 3C 298 Quasar Host Galaxy
Armus, Lee; Larkin, James E.; Wright, Shelley A. +3 more
We present high angular resolution multiwavelength data of the 3C 298 radio-loud quasar host galaxy (z = 1.439) taken using the W.M. Keck Observatory OSIRIS integral field spectrograph (IFS) with adaptive optics, the Atacama Large Millimeter/submillimeter Array (ALMA), the Hubble Space Telescope (HST) WFC3, and the Very Large Array (VLA). Extended…
The SEEDS High-Contrast Imaging Survey of Exoplanets Around Young Stellar Objects
Henning, Thomas; Terada, Hiroshi; Usuda, Tomonori +49 more
We present high-contrast observations of 68 young stellar objects (YSOs) that have been explored as part of the Strategic Exploration of Exoplanets and Disks with Subaru (SEEDS) survey on the Subaru telescope. Our targets are very young (<10 Myr) stars, which often harbor protoplanetary disks where planets may be forming. We achieve a typical c…
Millimetre-wave emission from an intermediate-mass black hole candidate in the Milky Way
Oka, Tomoharu; Tsujimoto, Shiho; Iwata, Yuhei +2 more
It is widely accepted that black holes with masses greater than a million solar masses (M⊙) lurk at the centres of massive galaxies. The origins of such `supermassive' black holes (SMBHs) remain unknown1, although those of stellar-mass black holes are well understood. One possible scenario is that intermediate-mass black hole…
Measurements of Photospheric and Chromospheric Magnetic Fields
Gosain, Sanjay; Lagg, Andreas; Lites, Bruce +2 more
The Sun is replete with magnetic fields, with sunspots, pores and plage regions being their most prominent representatives on the solar surface. But even far away from these active regions, magnetic fields are ubiquitous. To a large extent, their importance for the thermodynamics in the solar photosphere is determined by the total magnetic flux. W…
New constraints on the average escape fraction of Lyman continuum radiation in z 4 galaxies from the VIMOS Ultra Deep Survey (VUDS)
Maccagni, D.; Schaerer, D.; Thomas, R. +20 more
Context. Determining the average fraction of Lyman continuum (LyC) photons escaping high redshift galaxies is essential for understanding how reionization proceeded in the z> 6 Universe.
Aims: We want to measure the LyC signal from a sample of sources in the Chandra Deep Field South (CDFS) and COSMOS fields for which ultra-deep VIMOS spect…
Probing the intra-group medium of a z = 0.28 galaxy group
Tejos, N.; Morris, S. L.; Cantalupo, S. +4 more
We present new MUSE observations of a galaxy group probed by a background quasar. The quasar sightline passes between multiple z = 0.28 galaxies, whilst showing at the same redshift low-ionized metal line species, including Ca II, Mg I, Mg II and Fe II. Based on the galaxy redshifts measured from the MUSE data, we estimate the galaxies to be part …
Astrometric Calibration and Performance of the Dark Energy Camera
Benoit-Lévy, A.; Bechtol, K.; Smith, M. +54 more
We characterize the ability of the Dark Energy Camera (DECam) to perform relative astrometry across its 500 Mpix, 3-deg2 science field of view and across four years of operation. This is done using internal comparisons of ∼4 × 107 measurements of high signal-to-noise ratio stellar images obtained in repeat visits to fields of…