Search Publications
Grid-mapping Hellas Planitia, Mars - Insights into distribution, evolution and geomorphology of (Peri)-glacial, fluvial and lacustrine landforms in Mars' deepest basin
Jaumann, R.; Hauber, E.; Voelker, M. +1 more
Traditional maps of Hellas Planitia, the most prominent impact basin on Mars, have focused on the delineation of continuous surface units. We applied the newly developed grid-mapping method in order to quantitatively analyze the distribution and geostatistics of selected (peri)-glacial, fluvial, and lacustrine landforms. The study area was subdivi…
Discussing the distance bias in the estimation of Hi-GAL compact source physical properties - II. Evolutionary status and star formation rate
Elia, D.; Pezzuto, S.; Schisano, E. +2 more
The derivation of the evolutionary stage and rate of star formation of star-forming sites from Galactic single-dish far-infrared and submillimetre surveys suffers from the relatively limited spatial resolution that prevents access to 'core' scales (r ≤ 0.1 pc) for heliocentric distances d ≳ 1 kpc. In a previous article, we studied the implications…
Community Tools for Cartographic and Photogrammetric Processing of Mars Express HRSC Images
Kirk, R. L.; Gwinner, K.; Hare, T. +4 more
The High Resolution Stereo Camera (HRSC) on the Mars Express orbiter (Neukum et al. 2004) is a multi-line pushbroom scanner that can obtain stereo and color coverage of targets in a single overpass, with pixel scales as small as 10 m at periapsis. Since commencing operations in 2004 it has imaged  77 % of Mars at 2…
Identifying four INTEGRAL sources in the Galactic plane via VLT/optical and XMM-Newton/X-ray spectroscopy
Rahoui, Farid; Krivonos, Roman; Tomsick, John. A.
We report on FORS2 (FOcal Reducer/low dispersion Spectrograph 2) spectroscopy aiming at the identification of four Galactic plane sources discovered by INTEGRAL, IGR J18088-2741, IGR J18381-0924, IGR J17164-3803, and IGR J19173+0747, complemented by XMM-Newton spectroscopy for IGR J18381-0924. The presence of broad H I and He I emission lines and …
Estimating Spectra from Photometry
Connolly, Andrew J.; Kalmbach, J. Bryce
Measuring the physical properties of galaxies such as redshift frequently requires the use of spectral energy distributions (SEDs). SED template sets are, however, often small in number and cover limited portions of photometric color space. Here we present a new method to estimate SEDs as a function of color from a small training set of template S…
Multiple Populations in NGC 1851: Abundance Variations and UV Photometric Synthesis in the Washington and HST/WFC3 Systems
Cummings, Jeffrey D.; Geisler, D.; Villanova, S.
The analysis of multiple populations (MPs) in globular clusters (GCs), both spectroscopically and photometrically, is key in understanding their formation and evolution. The relatively narrow Johnson U, F336W, and Stromgren and Sloan u filters have been crucial in exhibiting these MPs photometrically, but in Paper I we showed that the broader Wash…
Carrington cycle 24: the solar chromospheric emission in a historical and stellar perspective
Schmitt, J. H. M. M.; Schröder, K. -P.; Mittag, M. +3 more
We present the solar S-index record of cycle 24, obtained by the Telescopio Internacional de Guanajuato, Robotico Espectroscopico robotic telescope facility and its high-resolution spectrograph HEROS (R ≈ 20 000), which measures the solar chromospheric Ca II H&K line emission by using moonlight. Our calibration process uses the same set of sta…
Complex diffuse emission in the z = 0.52 cluster PLCK G004.5-19.5
Mernier, F.; Brunetti, G.; Röttgering, H. J. A. +4 more
We present radio observations of the galaxy cluster PLCK G004.5-19.5 (z = 0.52) using the Giant Metrewave Radio Telescope at 150 MHz, 325 MHz, and 610 MHz. We find an unusual arrangement of diffuse radio emission in the center and periphery of the cluster, as well as several radio galaxies with head-tail emission. A patch of peripheral emission re…
Probing Large Galaxy Halos at Z ∼ 0 with Automated Lyα-absorption Matching
Wakker, Bart P.; French, David M.
We present initial results from an ongoing large-scale study of the circumgalactic medium in the nearby Universe ({cz} ≤slant 10,000 {km} {{{s}}}-1), using archival Cosmic Origins Spectrograph spectra of background quasi-stellar objects. This initial sample contains 33 sightlines chosen for their proximity to large galaxies (D≥slant 25 …
Determination of robust metallicities for metal-rich red giant branch stars. An application to the globular cluster NGC 6528
Liu, C.; Primas, F.; Feltzing, S. +1 more
Context. The study of the Milky Way relies on our ability to interpret the light from stars correctly. With the advent of the astrometric ESA mission Gaia we will enter a new era where the study of the Milky Way can be undertaken on much larger scales than currently possible. In particular we will be able to obtain full 3D space motions of red gia…