Search Publications
Molecular Gas Reservoirs in Cluster Galaxies at z = 1.46
Tamura, Yoichi; Kohno, Kotaro; Suzuki, Tomoko L. +7 more
We present molecular gas reservoirs of 18 galaxies associated with the XMMXCS J2215.9-1738 cluster at z = 1.46. From Band 7 and Band 3 data of the Atacama Large Millimeter/submillimeter Array, we detect dust continuum emission at 870 µm and the CO J = 2-1 emission line from 8 and 17 member galaxies, respectively, within a clustercentric radi…
RELICS: A Candidate z ∼ 10 Galaxy Strongly Lensed into a Spatially Resolved Arc
Ouchi, Masami; Frye, Brenda L.; Strait, Victoria +27 more
The most distant galaxies known are at z ∼ 10-11, observed 400-500 Myr after the Big Bang. The few z ∼ 10-11 candidates discovered to date have been exceptionally small, barely resolved, if at all, by the Hubble Space Telescope. Here we present the discovery of SPT0615-JD1, a fortuitous z ∼ 10 (z phot = {9.9}-0.6+0.8
On the Detection of Coronal Dimmings and the Extraction of Their Characteristic Properties
Temmer, M.; Veronig, A. M.; Vanninathan, K. +2 more
Coronal dimmings are distinct phenomena associated with coronal mass ejections (CMEs). The study of coronal dimmings and the extraction of their characteristic parameters help us to obtain additional information regarding CMEs, especially on the initiation and early evolution of Earth-directed CMEs. We present a new approach to detect coronal dimm…
Variable Outer Disk Shadowing around the Dipper Star RXJ1604.3-2130
Ginski, C.; Dominik, C.; Bouvier, J. +6 more
Low brightness dips have recently been observed in images of protoplanetary disks, and they are believed to be shadows by the inner disk. We present VLT/SPHERE polarimetric differential imaging of the transition disk around the dipper star RX J1604.3-2130. We gathered 11 epochs that cover a large temporal baseline, to search for variability over t…
Implications of the Large O VI Columns around Low-redshift L ∗ Galaxies
Werk, Jessica K.; McQuinn, Matthew
Observations reveal massive amounts of O VI around star-forming L * galaxies, with covering fractions of near unity extending to the host halo’s virial radius. This O VI absorption is typically kinematically centered upon photoionized gas, with line widths that are suprathermal and kinematically offset from the galaxy. We discuss variou…
Why the Shock-ICME Complex Structure Is Important: Learning from the Early 2017 September CMEs
Wang, Yuming; Shen, Chenglong; Luo, Bingxian +2 more
In the early days of 2017 September, an exceptionally energetic solar active region AR 12673 aroused great interest in the solar physics community. It produced four X class flares, more than 20 coronal mass ejections (CMEs), and an intense geomagnetic storm, for which the peak value of the Dst index reached up to -142 nT at 2017 September 8 02:00 …
SN 2017ein and the Possible First Identification of a Type Ic Supernova Progenitor
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Kelly, Patrick L. +11 more
We have identified a progenitor candidate in archival Hubble Space Telescope (HST) images for the Type Ic supernova (SN Ic) SN 2017ein in NGC 3938, pinpointing the candidate’s location via HST Target of Opportunity imaging of the SN itself. This would be the first identification of a stellar-like object as a progenitor candidate for any SN Ic to d…
The Black Hole in the Most Massive Ultracompact Dwarf Galaxy M59-UCD3
Romanowsky, Aaron J.; Pechetti, Renuka; Krajnović, Davor +19 more
We examine the internal properties of the most massive ultracompact dwarf galaxy (UCD), M59-UCD3, by combining adaptive-optics-assisted near-IR integral field spectroscopy from Gemini/NIFS and Hubble Space Telescope (HST) imaging. We use the multiband HST imaging to create a mass model that suggests and accounts for the presence of multiple stella…
Electron Acceleration by Dipolarization Fronts and Magnetic Reconnection: A Quantitative Comparison
Xu, Y.; Fu, H. S.; Liu, C. M. +1 more
Suprathermal electrons with energy from tens to hundreds of keV are frequently observed in the Earth's magnetotail. The generation of such electrons is typically attributed to magnetic reconnection, dipolarization fronts (DFs), or flux transport. However, which of these contributes more to this generation remains unclear. In this study, we quantit…
The R-Process Alliance: A Comprehensive Abundance Analysis of HD 222925, a Metal-poor Star with an Extreme R-process Enhancement of [Eu/H] = -0.14
Beers, Timothy C.; Placco, Vinicius M.; Hansen, Terese T. +4 more
We present a detailed abundance analysis of the bright (V = 9.02), metal-poor ([Fe/H] = -1.47 ± 0.08) field red horizontal-branch star HD 222925, which was observed as part of an ongoing survey by the R-Process Alliance. We calculate stellar parameters and derive abundances for 46 elements based on 901 lines examined in a high-resolution optical s…