Search Publications
A Spatially Resolved Study of X-Ray Properties in Superbubble 30 Dor C with XMM-Newton
Matsumoto, Hironori; Fukui, Yasuo; Sano, Hidetoshi +4 more
We carry out a spatially resolved spectral analysis with a physical scale of ∼10 pc in X-ray for the superbubble 30 Dor C, which has the largest diameter of ∼80 pc and the brightest non-thermal emission in superbubbles, for the first time. We aim at investigating spatial variation of the physical properties of non-thermal emission as detected in s…
Constraining the Gap Size in the Disk around HD 100546 in the Mid-infrared
Henning, Thomas; van Boekel, Roy; Panić, Olja +6 more
We refine the gap size measurements of the disk surrounding the Herbig Ae star HD 100546 in the N band. Our new mid-infrared interferometric (MIDI) data have been taken with the UT baselines and span the full range of orientations. The correlated fluxes show a wavy pattern in which the minima separation links to a geometrical structure in the disk…
Effect of Upstream ULF Waves on the Energetic Ion Diffusion at the Earth’s Foreshock. II. Observations
Dandouras, Iannis; Matsukiyo, Shuichi; Kis, Arpad +5 more
This study reports observations of energetic ions upstream of the Earth’s quasi-parallel bow shock by Cluster at times when interspacecraft separation distances were large. We analyze two individual upstream ion events during high solar wind velocity conditions to compare the spatial evolution of partial energetic ion densities in front of the Ear…
A Subarcsecond Near-infrared View of Massive Galaxies at z > 1 with Gemini Multi-conjugate Adaptive Optics
Surace, J. A.; Farrah, D.; Vaccari, M. +14 more
We present images taken using the Gemini South Adaptive Optics Imager (GSAOI) with the Gemini Multi-conjugate Adaptive Optics System (GeMS) in three 2 arcmin2 fields in the Spitzer Extragalactic Representative Volume Survey. These GeMS/GSAOI observations are among the first ≈0.″1 resolution data in the near-infrared spanning extragalact…
The Lives of Stars: Insights from the TGAS-RAVE-LAMOST Data Set
Smith, Martin C.; Vickers, John J.
In this paper, we investigate how the chemical and kinematic properties of stars vary as a function of age. Using data from a variety of photometric, astrometric, and spectroscopic surveys, we calculate the ages, phase space information, and orbits for ∼125,000 stars covering a wide range of stellar parameters. We find indications that the inner r…
Calibrating the James Webb Space Telescope Filters as Star Formation Rate Indicators
Moustakas, John; Armus, Lee; Brown, Michael J. I. +3 more
We have calibrated the 6.5 m James Webb Space Telescope (JWST) mid-infrared (MIR) filters as star formation rate (SFR) indicators, using JWST photometry synthesized from Spitzer spectra of 49 low-redshift galaxies, which cover a wider luminosity range than most previous studies. We use Balmer-decrement-corrected Hα luminosity and synthesized MIR p…
Coronal Electron Density Temperature and Solar Spectral Irradiance during Solar Cycles 23 and 24
Palacios, J.; Dal Lago, A.; Rodríguez Gómez, J. M. +1 more
Plasma parameters such as the electron density and temperature play a key role in the dynamics of the solar atmosphere. These characteristics are important in solar physics because they can help us to understand the physics of the solar corona, the ultimate goal being the reconstruction of the electron density and temperature distributions in the …
Thermal Reaction in Cometary and Pre-cometary Ices: Formation of Thiocarbamate in OCS-CH3NH2 Mixed Ices
Hodyss, Robert; Mahjoub, Ahmed
Cometary ices are rich sources of organic molecules relevant to prebiotic chemistry and may have played a key role in the delivery of the building blocks of life to Earth. Comets endure thermal processing of their surfaces during their orbits around the Sun. Furthermore, icy grain precursors of cometary materials may have experienced heating in th…
Extreme Circumgalactic H I and C III Absorption around the Most Massive, Quenched Galaxies
Ménard, Brice; Smailagić, Marijana; Prochaska, Jason Xavier +2 more
Luminous red galaxies (LRGs) are the most massive galaxies at z ∼ 0.5 and, by selection, have negligible star formation (SF). These objects have halo masses between those of L * galaxies, whose circumgalactic media (CGMs) are observed to have large masses of cold gas, and clusters of galaxies, which primarily contain hot gas. Here, we r…
An Updated Line List for NUV Spectral Synthesis in Evolved Stars: Redetermination of the Beryllium Abundance in the Solar Photosphere
Cunha, Katia; Smith, Verne V.; Carlberg, Joleen K. +1 more
Motivated by the desire to measure beryllium abundances in red giant stars, we have constructed a new line list for synthesizing spectra in the near-ultraviolet. Using the Sun, Arcturus, and Pollux as benchmark stars, we explore potential sources of missing continuous opacity and line absorption. Despite the inclusion of new sources of continuous …