Search Publications
Observing Ram Pressure at Work in Intermediate Redshift Clusters with MUSE: The Case of Abell 2744 and Abell 370
Richard, Johan; Fritz, Jacopo; Vulcani, Benedetta +11 more
Ram pressure stripping has been proven to be effective in shaping galaxy properties in dense environments at low redshift. The availability of Multi Unit Spectroscopic Explorer (MUSE) observations of a sample of distant (z ~ 0.3-0.5) clusters has allowed one to search for galaxies subject to this phenomenon at significant lookback times. In this p…
The Host Galaxy and Rapidly Evolving Broad-line Region in the Changing-look Active Galactic Nucleus 1ES 1927+654
Ho, Luis C.; Ricci, Claudio; Trakhtenbrot, Benny +4 more
Changing-look active galactic nuclei (AGNs) present an important laboratory to understand the origin and physical properties of the broad-line region (BLR). We investigate follow-up optical spectroscopy spanning ~500 days after the outburst of the changing-look AGN 1ES 1927+654. The emission lines displayed dramatic, systematic variations in inten…
\mathrm{SQuIGG}ěc{L}{E} : Studying Quenching in Intermediate-z Galaxies-Gas, \mathrm{Angu}ěc{L}\mathrm{ar} Momentum, and Evolution
Johnson, Benjamin D.; Bezanson, Rachel; Kriek, Mariska +12 more
We describe the Studying Quenching in Intermediate-z Galaxies: Gas, ${\rm{angu}}\overrightarrow{L}{\rm{ar}}$ momentum, and Evolution ( $\mathrm{SQuIGG}\vec{L}{\rm{E}}$ ) survey of intermediate-redshift post-starburst galaxies. We leverage the large sky coverage of the Sloan Digital Sky Survey to select ~ 1300 recently quenched galaxies at 0.5 <…
The Cosmic Telescope That Lenses the Sunburst Arc, PSZ1 G311.65-18.48: Strong Gravitational Lensing Model and Source Plane Analysis
Mahler, Guillaume; Rigby, Jane R.; Sharon, Keren +12 more
We present a strong-lensing analysis of the cluster PSZ1 G311.65-18.48, based on Hubble Space Telescope imaging, archival VLT/MUSE spectroscopy, and Chandra X-ray data. This cool-core cluster (z = 0.443) lenses the brightest lensed galaxy known, dubbed the "Sunburst Arc" (z = 2.3703), a Lyman continuum (LyC) emitting galaxy multiply imaged 12 time…
The Local Stellar Halo is Not Dominated by a Single Radial Merger Event
Kim, Bokyoung; Lépine, Sebastien; Newberg, Heidi Jo +1 more
We use halo dwarf stars with photometrically determined metallicities that are located within 2 kpc of the Sun to identify local halo substructure. The kinematic properties of these stars do not indicate a single, dominant radial merger event (RME). The retrograde Virgo Radial Merger (VRM) component has [Fe/H] = -1.7. A second, nonrotating RME com…
RESOLVE and ECO: Finding Low-metallicity z 0 Dwarf AGN Candidates Using Optimized Emission-line Diagnostics
Moffett, Amanda J.; Kannappan, Sheila J.; Norris, Mark A. +6 more
Existing star-forming vs. active galactic nucleus (AGN) classification schemes using optical emission-line diagnostics mostly fail for low-metallicity and/or highly star-forming galaxies, missing AGN in typical z ~ 0 dwarfs. To recover AGN in dwarfs with strong emission lines (SELs), we present a classification scheme optimizing the use of existin…
Interferometric Detections of sdO Companions Orbiting Three Classical Be Stars
Gies, Douglas R.; Wang, Luqian; Klement, Robert +17 more
Classical Be stars are possible products of close binary evolution, in which the mass donor becomes a hot, stripped O- or B-type subdwarf (sdO/sdB), and the mass gainer spins up and grows a disk to become a Be star. While several Be+sdO binaries have been identified, dynamical masses and other fundamental parameters are available only for a single…
Substructure at High Speed. II. The Local Escape Velocity and Milky Way Mass with Gaia eDR3
Necib, Lina; Lin, Tongyan
Measuring the escape velocity of the Milky Way is critical in obtaining the mass of the Milky Way, understanding the dark matter velocity distribution, and building the dark matter density profile. In Necib & Lin, we introduced a strategy to robustly measure the escape velocity. Our approach takes into account the presence of kinematic substru…
Survey of Ices toward Massive Young Stellar Objects. I. OCS, CO, OCN-, and CH3OH
Boogert, A. C. A.; Brewer, K.; Brittain, A. +1 more
An important tracer of the origin and evolution of cometary ices is the comparison with ices found in dense clouds and toward young stellar objects (YSOs). We present a survey of ices in the 2-5 µm spectra of 23 massive YSOs, taken with the NASA InfraRed Telescope Facility SpeX spectrometer. The 4.90 µm absorption band of OCS ice is de…
Dissecting Nearby Galaxies with piXedfit. I. Spatially Resolved Properties of Stars, Dust, and Gas as Revealed by Panchromatic SED Fitting
Tacchella, Sandro; Wu, Po-Feng; Morishita, Takahiro +5 more
We study spatially resolved properties (on spatial scales of ~1-2 kpc out to at least 3 effective radii) of the stars, dust, and gas in 10 nearby spiral galaxies. The properties of the stellar population and dust are derived by fitting the spatially resolved spectral energy distribution (SED) with more than 20 photometric bands ranging from far-ul…