Search Publications
Missions
Journals
Publication Years
Signatures of Cold Ions in a Kinetic Simulation of the Reconnecting Magnetopause
Lavraud, B.; Toledo-Redondo, S.; Aunai, N. +2 more
At the Earth's magnetopause, a low-energy ion population of ionospheric origin is commonly observed at the magnetospheric side. In this work we use a 2-D fully kinetic simulation to identify several original signatures related to the dynamics of cold ions involved in magnetic reconnection at the asymmetric dayside magnetopause. We identify several…
On the Origin of the Scatter in the Red Sequence: An Analysis of Four CLASH Clusters
Donahue, Megan; Kelson, Daniel D.; Moustakas, John +1 more
In clusters of galaxies, the red sequence is believed to be a consequence of a correlation between stellar mass and chemical abundances, with more massive galaxies being more metal-rich and, as a consequence, redder. However, there is a color scatter around the red sequence that holds even with precision photometry, implying that the galaxy popula…
Star-forming galaxies at low-redshift in the SHARDS survey
Mas-Hesse, J. M.; Hernán-Caballero, A.; Koekemoer, A. M. +13 more
Context. The physical processes driving the evolution of star formation (SF) in galaxies over cosmic time still present many open questions. Recent galaxy surveys allow now to study these processes in great detail at intermediate redshift (0 ≤ z ≤ 0.5).
Aims: We build a complete sample of star-forming galaxies and analyze their properties, re…
Equatorial Kelvin-like waves on slowly rotating and/or small-sized spheres: Application to Venus and Titan
Yamamoto, Masaru
Equatorial Kelvin waves, which have been observed in planetary fluids, produce superrotation and climatological variability. Although the meridional flow component is zero on Earth's beta-plane in the absence of background basic flow, it cannot be neglected on spheres in some planetary fluids when the Lamb parameter is small. For a vertically prop…
AXS: A Framework for Fast Astronomical Data Processing Based on Apache Spark
Bellm, Eric C.; Golkhou, V. Zach; Jurić, Mario +5 more
We introduce AXS (Astronomy eXtensions for Spark), a scalable open-source astronomical data analysis framework built on Apache Spark, a widely used industry-standard engine for big-data processing. Building on capabilities present in Spark, AXS aims to enable querying and analyzing almost arbitrarily large astronomical catalogs using familiar Pyth…
The UV spectral slope β and stellar population of most active star-forming galaxies at z ∼ 4
Yamada, Toru; Yamanaka, Satoshi
We investigate a stellar population of star-forming galaxies at z ∼ 4 by focusing on the slope of their rest-frame ultraviolet (UV) continuum, β, where fλ ∝ λβ. We investigate a sample of bright Lyman break galaxies (LBGs) with i' ≤ 26.0 in the Subaru/XMM-Newton Deep Survey field by using a spectral energy distribution fittin…
Galaxies of the z ∼ 2 Universe. I. Grism-selected Rest-frame Optical Emission-line Galaxies
Yang, Guang; Schneider, Donald P.; Gronwall, Caryl +6 more
Euclid, the Wide Field Infrared Survey Telescope, and the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) will make emission-line selected galaxies the largest observed constituent in the z > 1 universe. However, we only have a limited understanding of the physical properties of galaxies selected via their Lyα or rest-frame optical emiss…
Angular Sizes, Radii, and Effective Temperatures of B-type Stars from Optical Interferometry with the CHARA Array
Gies, Douglas R.; Schaefer, Gail H.; Huber, Daniel +2 more
We present interferometric observations of 25 spectral type-B stars that were made with the Precision Astronomical Visible Observations and the CLassic Interferometry with Multiple Baselines beam combiners at the Center for High Angular Resolution Astronomy Array (CHARA). The observations provide the angular sizes of these stars with an average er…
Super Metal-rich Stars in the LAMOST Survey: A Test on Radial Migration
Tian, H.; Zhao, G.; Chen, Y. Q. +5 more
Super metal-rich stars with [Fe/H] > 0.4 are selected from LAMOST DR6, and two groups, the blue and the red, are found in the T eff versus logg diagram with a temperature gap between them. In combination with Gaia DR2, stellar positions, velocities, and orbits are calculated, and spatial distributions, kinematical properties, and orb…
Kinematic signatures of cluster formation from cool collapse in the Lagoon Nebula cluster NGC 6530
Parker, Richard J.; Wright, Nicholas J.
We examine the mass dependence of the velocity dispersion of stars in the young cluster NGC 6530 to better understand how it formed. Using a large sample of members we find that the proper motion velocity dispersion increases with stellar mass. While this trend is the opposite of that predicted if the cluster were developing energy equipartition, …