Search Publications
Characterization of Two 2 mm detected Optically Obscured Dusty Star-forming Galaxies
Finkelstein, Steven L.; Casey, Caitlin M.; Kartaltepe, Jeyhan S. +22 more
The 2 mm Mapping Obscuration to Reionization with ALMA (MORA) Survey was designed to detect high-redshift (z ≳ 4), massive, dusty star-forming galaxies (DSFGs). Here we present two likely high-redshift sources, identified in the survey, whose physical characteristics are consistent with a class of optical/near-infrared (OIR)-invisible DSFGs found …
The K2 Galactic Archaeology Program Data Release 3: Age-abundance Patterns in C1-C8 and C10-C18
Lewis, Geraint F.; Vanderburg, Andrew; Chaplin, William J. +28 more
We present the third and final data release of the K2 Galactic Archaeology Program (K2 GAP) for Campaigns C1-C8 and C10-C18. We provide asteroseismic radius and mass coefficients, κ R and κ M , for ~19,000 red giant stars, which translate directly to radius and mass given a temperature. As such, K2 GAP DR3 represents the l…
The X-Ray and Radio Loud Fast Blue Optical Transient AT2020mrf: Implications for an Emerging Class of Engine-driven Massive Star Explosions
Kulkarni, S. R.; Chandra, Poonam; Perley, Daniel A. +9 more
We present AT2020mrf (SRGe J154754.2+443907), an extra-galactic (z = 0.1353) fast blue optical transient (FBOT) with a rise time of t g,rise = 3.7 days and a peak luminosity of M g,peak = -20.0. Its optical spectrum around peak shows a broad (v ~ 0.1c) emission feature on a blue continuum (T ~ 2 × 104 K), which b…
A Disk Instability Model for the Quasi-periodic Eruptions of GSN 069
Li, Shuang-Liang; Miniutti, Giovanni; Cao, Xinwu +2 more
GSN 069 is a recently discovered quasi-periodic eruption (QPE) source recurring about every 9 hr. The mechanism for the QPEs of GSN 069 is still unclear. In this work, a disk instability model is constructed to explain GSN 069 based on Pan et al. (PLC21), where the authors proposed a toy model for the repeating changing-look active galactic nuclei…
CLEAR: The Ionization and Chemical-enrichment Properties of Galaxies at 1.1 < z < 2.3
Papovich, Casey; Finkelstein, Steven L.; Cleri, Nikko J. +15 more
We use deep spectroscopy from the Hubble Space Telescope Wide-Field-Camera 3 IR grisms combined with broadband photometry to study the stellar populations, gas ionization and chemical abundances in star-forming galaxies at z ~ 1.1-2.3. The data stem from the CANDELS Lyα Emission At Reionization (CLEAR) survey. At these redshifts, the grism spectro…
CLEAR: Emission-line Ratios at Cosmic High Noon
Papovich, Casey; Finkelstein, Steven L.; Cleri, Nikko J. +10 more
We use Hubble Space Telescope Wide Field Camera 3 G102 and G141 grism spectroscopy to measure rest-frame optical emission-line ratios of 533 galaxies at z ~ 1.5 in the CANDELS Lyα Emission at Reionization survey. We compare [O III]/Hβ versus [S II]/(Hα + [N II]) as an "unVO87" diagram for 461 galaxies and [O III]/Hβ versus [Ne III]/[O II] as an "O…
Molecules with ALMA at Planet-forming Scales (MAPS): A Circumplanetary Disk Candidate in Molecular-line Emission in the AS 209 Disk
Zhang, Ke; Wilner, David J.; Ménard, François +29 more
We report the discovery of a circumplanetary disk (CPD) candidate embedded in the circumstellar disk of the T Tauri star AS 209 at a radial distance of about 200 au (on-sky separation of 1.″4 from the star at a position angle of 161°), isolated via 13CO J = 2-1 emission. This is the first instance of CPD detection via gaseous emission c…
Anomalous Flux in the Cosmic Optical Background Detected with New Horizons Observations
Buratti, Bonnie J.; Singer, Kelsi N.; Schenk, Paul M. +27 more
We used New Horizons LORRI images to measure the optical-band (0.4 ≲ λ ≲ 0.9µm) sky brightness within a high-galactic-latitude field selected to have reduced diffuse scattered light from the Milky Way galaxy (DGL), as inferred from the IRIS all-sky 100 µm map. We also selected the field to significantly reduce the scattered light from …
X-Ray Coronal Properties of Swift/BAT-selected Seyfert 1 Active Galactic Nuclei
Ricci, Claudio; Stern, Daniel; Urry, C. Megan +9 more
The corona is an integral component of active galactic nuclei (AGNs) which produces the bulk of the X-ray emission above 1-2 keV. However, many of its physical properties and the mechanisms powering this emission remain a mystery. In particular, the temperature of the coronal plasma has been difficult to constrain for large samples of AGNs, as con…
The Recent LMC-SMC Collision: Timing and Impact Parameter Constraints from Comparison of Gaia LMC Disk Kinematics and N-body Simulations
Choi, Yumi; van der Marel, Roeland P.; Nidever, David L. +4 more
We present analysis of the proper-motion (PM) field of the red clump stars in the Large Magellanic Cloud (LMC) disk using the Gaia Early Data Release 3 catalog. Using a kinematic model based on old stars with 3D velocity measurements, we construct the residual PM field by subtracting the center-of-mass motion and internal rotation motion component…