Search Publications
The GALAH survey: accurate radial velocities and library of observed stellar template spectra
Ting, Yuan-Sen; Casey, Andrew R.; Buder, Sven +34 more
GALAH is a large-scale magnitude-limited southern stellar spectroscopic survey. Its second data release (GALAH DR2) provides values of stellar parameters and abundances of 23 elements for 342 682 stars (Buder et al.). Here we add a description of the public release of radial velocities with a typical accuracy of 0.1 km s-1 for 336 215 o…
Chandra and XMM-Newton Observations of the Abell 3395/Abell 3391 Intercluster Filament
Jones, Christine; Randall, Scott W.; Bourdin, Hervé +2 more
We present Chandra and XMM-Newton X-ray observations of the Abell 3391/Abell 3395 intercluster filament. It has been suggested that the galaxy clusters Abell 3395, Abell 3391, and the galaxy group ESO-161 -IG 006 located between the two clusters, are in alignment along a large-scale intercluster filament. We find that the filament is aligned close…
Spectro-astrometry of the pre-transitional star LkCa 15 does not reveal an accreting planet but extended Hα emission
Mendigutía, I.; Huélamo, N.; Baines, D. +4 more
Context. The detection of forming planets in protoplanetary disks around young stars remains elusive, and state-of-the-art observational techniques provide somewhat ambiguous results. The pre-transitional T Tauri star LkCa 15 is an excellent example. It has been reported that it could host three planets; candidate planet b is in the process of for…
The Performance of the Robo-AO Laser Guide Star Adaptive Optics System at the Kitt Peak 2.1 m Telescope
Kulkarni, S. R.; Baranec, Christoph; Duev, Dmitry A. +5 more
Robo-AO is an autonomous laser guide star adaptive optics (AO) system recently commissioned at the Kitt Peak 2.1 m telescope. With the ability to observe every clear night, Robo-AO at the 2.1 m telescope is the first dedicated AO observatory. This paper presents the imaging performance of the AO system in its first 18 months of operations. For a m…
Discovery of a brown dwarf companion to the star HIP 64892
Rouan, D.; Henning, T.; Fantinel, D. +89 more
We report the discovery of a bright, brown dwarf companion to the star HIP 64892, imaged with VLT/SPHERE during the SHINE exoplanet survey. The host is a B9.5V member of the Lower-Centaurus-Crux subgroup of the Scorpius Centaurus OB association. The measured angular separation of the companion (1.2705 ± 0.0023") corresponds to a projected distance…
The 3CR Chandra Snapshot Survey: Extragalactic Radio Sources with 0.5 < z < 1.0
Forman, W. R.; Wilkes, B. J.; Liuzzo, E. +10 more
This paper presents the analysis of Chandra X-ray snapshot observations of a subsample of the extragalactic sources listed in the revised Third Cambridge radio catalog (3CR), previously lacking X-ray observations and thus observed during Chandra Cycle 15. This data set extends the current Chandra coverage of the 3CR extragalactic catalog up to red…
Measurement of the thermal Sunyaev-Zel'dovich effect around cosmic voids
Spergel, David N.; Alonso, David; Hill, J. Colin +1 more
We stack maps of the thermal Sunyaev-Zel'dovich effect produced by the Planck Collaboration around the centers of cosmic voids defined by the distribution of galaxies in the CMASS sample of the Baryon Oscillation Spectroscopic Survey, scaled by the void effective radii. We report a first detection of the associated cross-correlation at the 3.4 σ l…
Constraints on the Mass, Concentration, and Nonthermal Pressure Support of Six CLASH Clusters from a Joint Analysis of X-Ray, SZ, and Lensing Data
Koekemoer, Anton M.; Donahue, Megan; Koch, Patrick M. +17 more
We present a joint analysis of Chandra X-ray observations, Bolocam thermal Sunyaev-Zel’dovich (SZ) effect observations, Hubble Space Telescope (HST) strong-lensing data, and HST and Subaru Suprime-Cam weak-lensing data. The multiwavelength data set is used to constrain parametric models for the distribution of dark and baryonic matter in a sample …
A spectroscopic survey of the youngest field stars in the solar neighborhood . II. The optically faint sample
Montes, D.; Gandolfi, D.; Guillout, P. +5 more
Context. Star formation in the solar neighborhood is mainly traced by young stars in open clusters, associations, and in the field, which can be identified, for example, by their X-ray emission. The determination of stellar parameters for the optical counterparts of X-ray sources is crucial for a full characterization of these stars.
Aims: Th…
XMMPZCAT: A catalogue of photometric redshifts for X-ray sources
Georgantopoulos, I.; Mountrichas, G.; Corral, A. +1 more
Aims: The third version of the XMM-Newton serendipitous catalogue (3XMM), containing almost half million sources, is now the largest X-ray catalogue. However, its full scientific potential remains untapped due to the lack of distance information (i.e. redshifts) for the majority of its sources. Here we present XMMPZCAT, a catalogue of photome…