Search Publications
Core Mass Estimates in Strong Lensing Galaxy Clusters: A Comparison between Masses Obtained from Detailed Lens Models, Single-halo Lens Models, and Einstein Radii
Sharon, K.; Gladders, M. D.; Bleem, L. E. +7 more
The core mass of galaxy clusters is both an important anchor of the radial mass distribution profile and a probe of structure formation. With thousands of strong lensing galaxy clusters being discovered by current and upcoming surveys, timely, efficient, and accurate core mass estimates are needed. We assess the results of two efficient methods to…
Searching for Extragalactic Exoplanetary Systems: The Curious Case of BD+20 2457
Limberg, Guilherme; Rossi, Silvia; Borbolato, Lais +4 more
Planets and their host stars carry a long-term memory of their origin in their chemical compositions. Thus, identifying planets formed in different environments improves our understating of planetary formation. Although restricted to detecting exoplanets within the solar vicinity, we might be able to detect planetary systems that formed in small e…
Fe XVII 2p-3s Line Ratio Diagnostic of Shock Formation Radius in O Stars
Leutenegger, Maurice A.; Grell, Gabriel J.; Shah, Chintan
The 2p-3s lines of Fe XVII in the X-ray spectrum of the O-type star ζ Puppis exhibit an anomalous (3G + M2)/(3F) line ratio of ~1.4, in comparison with ~2.4 for almost all other collisionally excited astrophysical spectra. Based on the work of Mauche et al., we conjectured that the strong UV field of ζ Puppis produces the observed ratio by depopul…
Thermal Pressures in the Interstellar Medium away from Stellar Environments
Tripp, Todd M.; Jenkins, Edward B.
Interstellar thermal pressures can be measured using C I absorption lines that probe the pressure-sensitive populations of the fine-structure levels of its ground state. In a survey of C I absorption toward Galactic hot stars, Jenkins & Tripp found evidence of small amounts (~0.05%) of gas at high pressures ( $p/k\gg {10}^{4}\,{\mat…
Discovery of Two Infrared Objects with Strong Ice Absorption in the Akari Slitless Spectroscopic Survey of the Galactic Plane
Onaka, Takashi; Sakon, Itsuki; Shimonishi, Takashi +1 more
We discover two infrared objects that show deep absorption features of H2O, CO2, and CO ices in the AKARI/Infrared Camera slitless spectroscopic survey of the Galactic plane in 2.5-13 µm. Both objects are neither located in known star-forming regions nor in known dense clouds. For one of the objects, Object 1, we succes…
Multiwavelength Observations of the RV Tauri Variable System U Monocerotis: Long-term Variability Phenomena That Can Be Explained by Binary Interactions with a Circumbinary Disk
Stassun, Keivan G.; Kastner, Joel H.; Sabin, Laurence +7 more
We present an X-ray through submillimeter observations of the classical RV Tauri (RVb-type) variable U Mon, a post-asymptotic giant branch (AGB) binary with a circumbinary disk (CBD). Our SMA observations indicate a CBD diameter of ≲550 au. Our XMM-Newton observations make U Mon the first RV Tauri variable detected in X-rays. The X-ray emission is…
Compound Eruptions of Twin Flux Ropes in a Solar Active Region
Zhang, Liang; Chen, Yao; Feng, Shiwei +6 more
Compound eruptions represent that multiple closely spaced magnetic structures erupt consecutively within a short interval, and then lead to a single flare and a single coronal mass ejection (CME). However, it is still subtle for the links between multiple eruptions and the associated single flare or/and single CME. In this Letter, we report the co…
The z 2 [O III] Luminosity Function of Grism-selected Emission-line Galaxies
Schneider, Donald P.; Gronwall, Caryl; Ciardullo, Robin +7 more
Upcoming missions such as Euclid and the Nancy Grace Roman Space Telescope (Roman) will use emission-line-selected galaxies to address a variety of questions in cosmology and galaxy evolution in the z > 1 universe. The optimal observing strategy for these programs relies on knowing the number of galaxies that will be found and the bias of the g…
The Spatial Distributions of Blue Main-sequence Stars in Magellanic Cloud Star Clusters
Deng, Licai; de Grijs, Richard; Li, Chengyuan +1 more
The color-magnitude diagrams of young star clusters show that, particularly at ultraviolet wavelengths, their upper main sequences (MSs) bifurcate into a sequence comprising the bulk population and a blue periphery. The spatial distribution of stars is crucial to understanding the reasons for these distinct stellar populations. This study uses hig…
The Astrophysical Variance in Gaia-Radial Velocity Spectrometer Spectra
Rampalli, Rayna; Ness, Melissa; Wylie, Shola
Large surveys are providing a diversity of spectroscopic observations with Gaia alone set to deliver millions of Ca-triplet-region spectra across the Galaxy. We aim to understand the dimensionality of the chemical abundance information in the Gaia-Radial Velocity Spectrometer (RVS) data to inform galactic archeology pursuits. We fit a quadratic mo…