Search Publications
Directly Tracing Cool Filamentary Accretion over >100 kpc into the Interstellar Medium of a Quasar Host at z = 1
Johnson, Sean D.; Kollatschny, Wolfram; Chen, Hsiao-Wen +10 more
We report the discovery of giant (50-100 kpc) [O II] emitting nebulae with MUSE in the field of TXS 0206-048, a luminous quasar at z = 1.13. "Down-the-barrel" UV spectra of the quasar show absorption at velocities coincident with those of the extended nebulae, enabling new insights into inflows and outflows around the quasar host. One nebula exhib…
Simultaneous Evidence of Edge Collapse and Hub-filament Configurations: A Rare Case Study of a Giant Molecular Filament, G45.3+0.1
Dewangan, L. K.; Ojha, D. K.; Pirogov, L. E. +2 more
We study multiwavelength and multiscale data to investigate the kinematics of molecular gas associated with the star-forming complexes G045.49+00.04 (G45E) and G045.14+00.14 (G45W) in the Aquila constellation. An analysis of the FUGIN 13CO(1-0) line data unveils the presence of a giant molecular filament (GMF G45.3+0.1; length ~75 pc, m…
TPHO: A Time-dependent Photoionization Model for AGN Outflows
Mehdipour, Missagh; Kaastra, Jelle; Kara, Erin +3 more
Outflows in active galactic nuclei (AGN) are considered a promising candidate for driving AGN feedback at large scales. However, without information on the density of these outflows we cannot determine how much kinetic power they are imparting to the surrounding medium. Monitoring the response of the ionization state of the absorbing outflows to c…
Photospheric Prompt Emission From Long Gamma Ray Burst Simulations. II. Spectropolarimetry
Lazzati, Davide; Parsotan, Tyler
Although gamma ray bursts (GRBs) have been detected for many decades, the lack of knowledge regarding the radiation mechanism that produces the energetic flash of radiation, or prompt emission, from these events has prevented the full use of GRBs as probes of high-energy astrophysical processes. While there are multiple models that attempt to desc…
Discovery of a Double Sequence of Blue Straggler Stars in the Core-collapsed Globular Cluster NGC 6256
Cadelano, Mario; Pallanca, Cristina; Dalessandro, Emanuele +3 more
We used a combination of high-resolution optical images acquired with the Hubble Space Telescope and near-IR wide-field data to investigate the stellar density profile and the population of blue straggler stars (BSSs) in the Galactic globular cluster NGC 6256, with the aim of probing its current stage of internal dynamical evolution. We found that…
An Absolute Calibration of the Near-infrared Period-Luminosity Relations of Type II Cepheids in the Milky Way and in the Large Magellanic Cloud
Breuval, Louise; Gieren, Wolfgang; Pietrzyński, Grzegorz +29 more
We present time-series photometry of 21 nearby type II Cepheids in the near-infrared J, H, and K s passbands. We use this photometry, together with the Third Gaia Early Data Release parallaxes, to determine for the first time period-luminosity relations (PLRs) for type II Cepheids from field representatives of these old pulsating star…
Burton's Curse: The Impact of Bulk Flows on the Galactic Longitude-Velocity Diagram and the Illusion of a Continuous Perseus Arm
Peek, J. E. G.; Tchernyshyov, Kirill; Miville-Deschenes, Marc-Antoine
In this work, we demonstrate that the Perseus Arm is not a continuous structure of molecular gas in the second quadrant. We first show that the observed, distanced-resolved velocity structure of the Galaxy in the outer disk is capable of creating illusory spiral arms, as was first proposed by Burton. Second, we measure the distances to a collectio…
The Compact Structures of Massive z ∼ 0.7 Post-starburst Galaxies in the SQuIGG$\vec{L}$E Sample
Bezanson, Rachel; Kriek, Mariska; Greene, Jenny E. +9 more
We present structural measurements of 145 spectroscopically selected intermediate-redshift (z ~ 0.7), massive (M ⋆ ~ 1011 M ⊙) post-starburst galaxies from the $\mathrm{SQuIGG}\vec{L}{\rm{E}}$ sample measured using wide-depth Hyper Suprime-Cam i-band imaging. This deep imaging allows us to probe the sizes and struc…
Correlated Spatio-temporal Evolution of Extreme-Ultraviolet Ribbons and Hard X-Rays in a Solar Flare
Qiu, J.; Antiochos, S. K.; Drake, J. F. +4 more
We analyze the structure and evolution of ribbons from the M7.3 SOL2014-04-18T13 flare using ultraviolet images from the Interface Region Imaging Spectrograph and the Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA), magnetic data from the SDO/Helioseismic and Magnetic Imager, hard X-ray (HXR) images from the Reuven Ramaty High …
A New Member of the Milky Way's Family Tree: Characterizing the Pontus Merger of Our Galaxy
Malhan, Khyati
We study the Pontus structure-a recently discovered merger that brought in ~7 globular clusters in the course of the hierarchical buildup of the Milky Way's halo. Here, we analyze the stellar population of Pontus and examine (1) its phase-space distribution using the ESA/Gaia data set, (2) its metallicity and chemical abundances (i.e., [Fe/H], [α/…