Search Publications
Spatially Resolved Recent Star Formation History in NGC 6946
Dolphin, Andrew; Telford, O. Grace; Koplitz, Brad +6 more
The nearby face-on star-forming spiral galaxy NGC 6946 is known as the Fireworks Galaxy due to its hosting an unusually large number of supernovae. We analyze its resolved near-ultraviolet stellar photometry measured from images taken with the Hubble Space Telescope's Wide Field Camera 3 with the F275W and F336W filters. We model the color-magnitu…
Searching for New Globular Clusters in M31 with Gaia EDR3
Niu, Zexi; Liu, Jifeng; Huang, Song +5 more
We have found 50 new globular cluster (GC) candidates around M31 with Gaia Early Data Release 3 (EDR3), with the help of Pan-STARRS1 DR1 magnitudes and Pan-Andromeda Archaeological Survey (PAndAS) images. Based on the latest Revised Bologna Catalog and simbad, we trained two random forest (RF) classifiers, the first one to distinguish extended sou…
SPT-CL J2215-3537: A Massive Starburst at the Center of the Most Distant Relaxed Galaxy Cluster
Mahler, Guillaume; Allen, Steven W.; Sharon, Keren +15 more
We present the discovery of the most distant, dynamically relaxed cool core cluster, SPT-CL J2215-3537 (SPT2215), and its central brightest cluster galaxy (BCG) at z = 1.16. Using new X-ray observations, we demonstrate that SPT2215 harbors a strong cool core with a central cooling time of 200 Myr (at 10 kpc) and a maximal intracluster medium cooli…
Two-point Correlation Function Studies for the Milky Way: Discovery of Spatial Clustering from Disk Excitations and Substructure
Yanny, Brian; Gardner, Susan; Hinkel, Austin
We introduce a two-particle correlation function (2PCF) for the Milky Way, constructed to probe spatial correlations in the orthogonal directions of the stellar disk in the Galactic cylindrical coordinates of R, ϕ, and z. We use this new tool to probe the structure and dynamics of the Galaxy using the carefully selected set of solar neighborhood s…
The Sun's Magnetic Power Spectra over Two Solar Cycles. I. Calibration between SDO/HMI and SOHO/MDI Magnetograms
Wang, Ruihui; Jiang, Jie; Luo, Yukun
The Sun's magnetic field is strongly structured over a broad range of scales. Magnetic spatial power spectral analysis provides a powerful tool for understanding the various scales of magnetic fields and their interactions with plasma motions. We aim to investigate the power spectra using spherical harmonic decomposition of high-resolution Solar a…
On the Metallicities and Kinematics of the Circumgalactic Media of Damped Lyα Systems at z 2.5
Urbano Stawinski, Stephanie M.; Hennawi, Joseph F.; Hafen, Zachary +7 more
We use medium- and high-resolution spectroscopy of close pairs of quasars to analyze the circumgalactic medium (CGM) surrounding 32 damped Lyα absorption systems (DLAs). The primary quasar sightline in each pair probes an intervening DLA in the redshift range 1.6 < z abs < 3.5, such that the secondary sightline probes absorption f…
A Simple Method for Predicting N H Variability in Active Galactic Nuclei
Marchesi, Stefano; Zhao, Xiurui; Ajello, Marco +4 more
The unified model of active galactic nuclei (AGNs) includes a geometrically thick obscuring medium to explain the differences between type I and type II AGNs as an effect of inclination angle. This medium is often referred to as the torus and is thought to be "clumpy" as the line-of-sight column density, N H, has been observed to vary i…
Probing Reflection from Aerosols with the Near-infrared Dayside Spectrum of WASP-80b
Fortney, Jonathan J.; Stevenson, Kevin B.; Désert, Jean-Michel +9 more
The presence of aerosols is intimately linked to the global energy budget and the composition of a planet's atmosphere. Their ability to reflect incoming light prevents energy from being deposited into the atmosphere, and they shape the spectra of exoplanets. We observed five near-infrared secondary eclipses of WASP-80b with the Wide Field Camera …
JWST Reveals Widespread CO Ice and Gas Absorption in the Galactic Center Cloud G0.253+0.016
Lu, Xing; Henshaw, Jonathan D.; Ginsburg, Adam +7 more
We report JWST NIRCam observations of G0.253+0.016, the molecular cloud in the Central Molecular Zone known as "The Brick," with the F182M, F187N, F212N, F410M, F405N, and F466N filters. We catalog 56,146 stars detected in all six filters using the crowdsource package. Stars within and behind The Brick exhibit prodigious absorption in the F466N fi…
The IR Compactness of Dusty Galaxies Sets Star Formation and Dust Properties at z ∼ 0-2
Kirkpatrick, Allison; Inami, Hanae; McKinney, Jed +9 more
The surface densities of gas, dust, and stars provide a window into the physics of star formation that, until the advent of high-resolution far-IR/submillimeter observations, has been historically difficult to assess among dusty galaxies. To study the link between IR surface densities and dust properties, we leverage the Atacama Large Millimetre/S…