Search Publications
Stellar Mass-Gas-phase Metallicity Relation at 0.5 ≤ z ≤ 0.7: A Power Law with Increasing Scatter toward the Low-mass Regime
Barro, Guillermo; Pérez-González, Pablo G.; Hathi, Nimish P. +21 more
We present the stellar mass ({M}*)-gas-phase metallicity relation (MZR) and its scatter at intermediate redshifts (0.5≤slant z≤slant 0.7) for 1381 field galaxies collected from deep spectroscopic surveys. The star formation rate (SFR) and color at a given {M}* of this magnitude-limited (R≲ 24 AB) sample are representative of …
Transition Region and Chromospheric Signatures of Impulsive Heating Events. I. Observations
Warren, Harry P.; Crump, Nicholas A.; Reep, Jeffrey W. +1 more
We exploit the high spatial resolution and high cadence of the Interface Region Imaging Spectrograph (IRIS) to investigate the response of the transition region and chromosphere to energy deposition during a small flare. Simultaneous observations from the Reuven Ramaty High Energy Solar Spectroscopic Imager provide constraints on the energetic ele…
Setting constraints on the nature and origin of the two major hydrous sulfates on Mars: Monohydrated and polyhydrated sulfates
Liu, Yang; Wang, Alian; Jolliff, Bradley L. +1 more
Monohydrated Mg sulfate (MgSO4·H2O) and polyhydrated sulfate are the most common and abundant hydrous sulfates observed thus far on Mars. They are widely distributed and coexist in many locations. On the basis of results from two new sets of experiments, in combination with past experimental studies and the subsurface salt mi…
On the red giant branch mass loss in 47 Tucanae: Constraints from the horizontal branch morphology
Salaris, Maurizio; Cassisi, Santi; Pietrinferni, Adriano
We obtain stringent constraints on the actual efficiency of mass loss for red giant branch stars in the Galactic globular cluster 47 Tuc, by comparing synthetic modelling based on stellar evolution tracks with the observed distribution of stars along the horizontal branch in the colour-magnitude-diagram. We confirm that the observed, wedge-shaped …
High ionisation absorption in low mass X-ray binaries
Merloni, A.; Bianchi, S.; Ponti, G. +3 more
The advent of the new generation of X-ray telescopes yielded a significant step forward in our understanding of ionised absorption generated in the accretion discs of X-ray binaries. It has become evident that these relatively weak and narrow absorption features, sporadically present in the X-ray spectra of some systems, are actually the signature…
The Total Solar Irradiance Climate Data Record
Dewitte, Steven; Nevens, Stijn
We present the composite measurements of total solar irradiance (TSI) as measured by an ensemble of space instruments. The measurements of the individual instruments are put on a common absolute scale, and their quality is assessed by intercomparison. The composite time series is the average of all available measurements. From 1984 April to the pr…
Four and one more: The formation history and total mass of globular clusters in the Fornax dSph
Fraser, M.; de Boer, T. J. L.
We have determined the detailed star formation history and total mass of the globular clusters in the Fornax dwarf spheroidal using archival HST WFPC2 data. Colour-magnitude diagrams were constructed in the F555W and F814W bands and corrected for the effect of Fornax field star contamination, after which we used the routine Talos to derive the qua…
Testing chirality of primordial gravitational waves with Planck and future CMB data: no hope from angular power spectra
Melchiorri, Alessandro; Shiraishi, Maresuke; Gerbino, Martina +2 more
We use the 2015 Planck likelihood in combination with the Bicep2/Keck likelihood (BKP and BK14) to constrain the chirality, χ, of primordial gravitational waves in a scale-invariant scenario. In this framework, the parameter χ enters theory always coupled to the tensor-to-scalar ratio, r, e.g. in combination of the form χ ṡ r. Thus, the capability…
Physical Properties of Spectroscopically Confirmed Galaxies at z ≥ 6. III. Stellar Populations from SED Modeling with Secure Lyα Emission and Redshifts
Ouchi, Masami; Shimasaku, Kazuhiro; Fan, Xiaohui +9 more
We present a study of stellar populations in a sample of spectroscopically confirmed Lyman-break galaxies (LBGs) and Lyα emitters (LAEs) at 5.7< z< 7. These galaxies have deep images from Subaru, the Hubble Space Telescope, and Spitzer/IRAC. We focus on 27 galaxies with IRAC detections, and characterize their stellar populations based on the…
Alluvial Fan Morphology, distribution and formation on Titan
Hayes, A. G.; Birch, S. P. D.; Radebaugh, J. +2 more
Titan is a hydrologically active world, with dozens of alluvial fans that are evidence of sediment transport from high to low elevations. However, the distribution and requirements for the formation of fans on Titan are not well understood. We performed the first global survey of alluvial fans on Titan using Cassini Synthetic Aperture Radar (SAR) …