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INFRA-ICE: An ultra-high vacuum experimental station for laboratory astrochemistry
Santoro, Gonzalo; Sobrado, Jesús. M.; Tajuelo-Castilla, Guillermo +7 more
Laboratory astrochemistry aims at simulating, in the laboratory, some of the chemical and physical processes that operate in different regions of the universe. Amongst the diverse astrochemical problems that can be addressed in the laboratory, the evolution of cosmic dust grains in different regions of the interstellar medium (ISM) and its role in…
Far-infrared star formation rates of six GRB host galaxies with ALMA
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +7 more
Gamma-ray bursts (GRBs) can be a promising tracer of cosmic star formation rate history (CSFRH). In order to reveal the CSFRH using GRBs, it is important to understand whether they are biased tracers or not. For this purpose, it is crucial to understand properties of GRB host galaxies, in comparison to field galaxies. In this work, we report ALMA …
Saturn in Lyman α: A comparison of Cassini and Voyager observations
Sandel, B. R.; Quemerais, E.; Yelle, R. V. +2 more
We analyze Saturn Lyman α system scans observed by the Cassini/UVIS instrument probing non-auroral airglow emissions from Saturn's disk, the ring atmosphere and the Saturn hydrogen torus. We constrain variations in disk brightness with latitude and local time, relating them to models of Saturn's upper atmosphere. We compare these results with Voya…
Using cross correlation to estimate Doppler frequency
Li, Fei; Yan, Jianguo; He, Qingbao +2 more
Doppler frequency estimation with high accuracy is very important for precise orbit determination and scientific studies in deep space exploration. In this paper, we propose a new method which implements cross correlation of only received signals from one single station to estimate Doppler frequency. The algorithm is relatively simple and it can a…
Empirical Brightness Control and Equalization of Mars Context Camera Images
Robbins, Stuart J.; Kirchoff, Michelle R.; Hoover, Rachael H.
The Mars Reconnaissance Orbiter (MRO) spacecraft has been in orbit around Mars since March 2006. The Context Camera (CTX) on MRO has returned over 115,000 images of the planet at approximately 5-6 m per pixel, providing nearly global coverage. During that time, Mars has gone through nearly seven of its own years, changing solar distance from 1.38 …
Geometric Support for Dark Matter by an Unaligned Einstein Ring in A3827
Broadhurst, Tom; Oguri, Masamune; Chen, Mandy C. +4 more
The nondetection of dark matter (DM) particles in increasingly stringent laboratory searches has encouraged alternative gravity theories where gravity is sourced only from visible matter. Here, we consider whether such theories can pass a two-dimensional test posed by gravitational lensing—to reproduce a particularly detailed Einstein ring in the …
Stellar Variability in a Forming Massive Star Cluster
Andersen, Morten; Cheng, Yu; Tan, Jonathan
We present a near-infrared (NIR) variability analysis for a 6' × 6' region, which encompasses the massive protocluster G286.21+0.17. The total sample comprises more than 5000 objects, of which 562 show signs of a circumstellar disk based on their infrared colors. The data includes Hubble Space Telescope observations taken in two epochs separated b…
Co-evolution of nuclear rings, bars and the central intensity ratio of their host galaxies
Ravikumar, C. D.; Aswathy, S.
Using a sample of 13 early-type spiral galaxies hosting nuclear rings, we report remarkable correlations between the properties of the nuclear rings and the central intensity ratio (CIR) of their host galaxies. The CIR, a function of intensity of light within the central 1.5 and 3 arcsec region, is found to be a vital parameter in galaxy evolution…
The Energetics of Launching the Most Powerful Jets in Quasars: A Study of 3C 82
Berton, Marco; Zeimann, Greg; Hill, Gary J. +5 more
3C 82 at a redshift of 2.87 is the most distant 3C (Third Cambridge Catalogue) quasar. Thus, it is a strong candidate to have the most-luminous radio lobes in the universe. 3C 82 belongs to the class of compact steep-spectrum radio sources. We use single-dish and interferometric radio observations in order to model the plasma state of these powerf…
Spin clusters inside four young asteroid groups
Spoto, F.; Carruba, V.; Ramos, L. G. M.
Asteroid groups may either form because of collisions or because of spin induced fission. Recently it has been shown that young spin clusters tend to form more frequently in young collisional families than in older groups. Here, we study the occurrence of spin clusters inside four very recently identified asteroid groups: the (525) Adelaide, (2258…