Search Publications
Supernova Remnants in M83 as Observed with MUSE
Della Bruna, Lorenza; Blair, William P.; Adamo, Angela +4 more
Here we describe a new study of the supernova remnants (SNRs) and SNR candidates in nearby face-on spiral galaxy M83, based primarily on MUSE integral field spectroscopy. Our revised catalog of SNR candidates in M83 has 366 objects, 81 of which are reported here for the first time. Of these, 229 lie within the MUSE observation region, 160 of which…
The Candidate Progenitor Companion Star of the Type Ib/c SN 2013ge
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Williams, Benjamin F. +17 more
This Letter presents the detection of a source at the position of the Type Ib/c supernova (SN) 2013ge more than four years after the radioactive component is expected to have faded. This source could mark the first post-SN direct detection of a surviving companion to a stripped-envelope Type Ib/c explosion. We test this hypothesis and find the sha…
Magellan/IMACS Spectroscopy of Grus I: A Low Metallicity Ultra-faint Dwarf Galaxy
Li, Ting S.; Frebel, Anna; Simon, Joshua D. +3 more
We present a chemodynamical study of the Grus I ultra-faint dwarf galaxy (UFD) from medium-resolution (R ~ 11,000) Magellan/IMACS spectra of its individual member stars. We identify eight confirmed members of Grus I, based on their low metallicities and coherent radial velocities, and four candidate members for which only velocities are derived. I…
Evolution of X-Ray Activity in <25 Myr Old Pre-main Sequence Stars
Garmire, Gordon P.; Feigelson, Eric D.; Broos, Patrick S. +4 more
Measuring the evolution of X-ray emission from pre-main-sequence (PMS) stars gives insight into two issues: the response of magnetic dynamo processes to changes in the interior structure, and the effects of high-energy radiation on protoplanetary disks and primordial planetary atmospheres. We present a sample of 6003 stars with ages 7-25 Myr in 10…
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…