Search Publications
The Milky Way Rotation Curve Revisited
Krełowski, J.; Strobel, A.; Galazutdinov, G.
The paper revisits the problem described in detail in our Paper I (Galazutdinov et al.) concluding that the rotation curve of the thin gaseous Galactic disk, represented by the CaII lines, is Keplerian outside the solar orbit rather than flat. Now we apply new trigonometric Gaia parallaxes, published in the Data Release 2. We demonstrate that the …
A Binary Nature of the Marginal CP Star Sigma Sculptoris
Krtička, Jiří; Paunzen, Ernst; Adam, Christian +7 more
The A2 V star σ Scl was suspected of being a low-amplitude rotating variable of the Ap-type star by several authors. Aiming to decide whether the star is a variable chemically peculiar (CP) star, we searched for the photometric and spectroscopic variability, and determined chemical abundances of σ Scl. The possible variability was tested using sev…
Variability Analysis of δ Scuti Candidate Stars
Tautvaišienė, Gražina; Pakštienė, Erika; Janulis, Rimvydas +5 more
The Hipparcos catalog contains stars suspected to be δ Scuti variables for which extensive ground-based observations and characterization of variability are necessary. Our aim was to characterize variability of 13 candidates to δ Scuti type stars. We obtained 24 215 CCD images and analyzed stellar light curves using the Period04 program. Twelve δ …
Mean Occupation Function of High-redshift Quasars from the Planck Cluster Catalog
Myers, Adam D.; Chakraborty, Priyanka; Chatterjee, Suchetana +1 more
We characterize the distribution of quasars within dark matter halos using a direct measurement technique for the first time at redshifts as high as z ∼ 1. Using the Planck Sunyaev-Zeldovich (SZ) catalog for galaxy groups and the Sloan Digital Sky Survey (SDSS) DR12 quasar data set, we assign host clusters/groups to the quasars and make a measurem…
Precision Time-series Photometry in the Thermal Infrared with a “Wall-eyed” Pointing Mode at the Large Binocular Telescope
Skemer, Andrew; Spalding, Eckhart; Hinz, Phil +3 more
Time-series photometry taken from ground-based facilities is improved with the use of comparison stars due to the short timescales of atmospheric-induced variability. However, the sky is bright in the thermal infrared (3-5 µm), and the correspondingly small fields of view of available detectors make it highly unusual to have a calibration st…
Study of CoRoT 105415473: A Heartbeat Star with δ Scuti Oscillations
Chou, Dean-Yi; Fernández Fernández, Javier
We study the light curves of CoRoT 105415473 with the CoRoT satellite photometric data of 144 days. The light curves consist of two types of temporal variations: periodic brightening and pulsational. The periodic brightening suggests that the variations are from a binary system without eclipsing, with an orbital period of 2.6 days. The frequency a…
DustPedia: A Definitive Study of Cosmic Dust in the Local Universe
Bianchi, S.; Smith, M.; Fritz, J. +20 more
The European Space Agency has invested heavily in two cornerstones missions: Herschel and Planck. The legacy data from these missions provides an unprecedented opportunity to study cosmic dust in galaxies so that we can, for example, answer fundamental questions about the origin of the chemical elements, physical processes in the interstellar medi…
The Breakthrough Listen Search for Intelligent Life: Target Selection of Nearby Stars and Galaxies
DeBoer, David; Marcy, Geoffrey W.; Siemion, Andrew P. V. +10 more
We present the target selection for the Breakthrough Listen search for extraterrestrial intelligence during the first year of observations at the Green Bank Telescope, Parkes Telescope, and Automated Planet Finder. On the way to observing 1,000,000 nearby stars in search of technological signals, we present three main sets of objects we plan to ob…
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…
Instrumental response model and detrending for the Dark Energy Camera
Abbott, T. M. C.; Desai, S.; Gruen, D. +12 more
We describe the model for mapping from sky brightness to the digital output of the Dark Energy Camera (DECam) and the algorithms adopted by the Dark Energy Survey (DES) for inverting this model to obtain photometric measures of celestial objects from the raw camera output. This calibration aims for fluxes that are uniform across the camera field o…