Search Publications
The Molecular Clouds Fueling A 1/5 Solar Metallicity Starburst
Leroy, Adam K.; Johnson, Kelsey E.; Sandstrom, Karin +2 more
Using the Atacama Large Millimeter/submillimeter Array, we have made the first high spatial and spectral resolution observations of the molecular gas and dust in the prototypical blue compact dwarf galaxy II Zw 40. The {}12{CO}(2-1) and {}12{CO}(3-2) emission is clumpy and distributed throughout the central star-forming regio…
Hinode and IRIS Observations of the Magnetohydrodynamic Waves Propagating from the Photosphere to the Chromosphere in a Sunspot
Shimizu, Toshifumi; Imada, Shinsuke; Kanoh, Ryuichi
Magnetohydrodynamic (MHD) waves have been considered as energy sources for heating the solar chromosphere and the corona. Although MHD waves have been observed in the solar atmosphere, there are a lack of quantitative estimates on the energy transfer and dissipation in the atmosphere. We performed simultaneous Hinode and Interface Region Imaging S…
Determination of Coronal Mass Ejection Physical Parameters from a Combination of Polarized Visible Light and UV Lyα Observations
Bemporad, A.; Susino, R.
Visible-light observations of Coronal Mass Ejections (CMEs) performed with coronagraphs and heliospheric imagers (in primis on board the Solar and Heliospheric Observatory and STEREO missions) have offered the best way to study the kinematics and geometrical structure of these fundamental events so far. Nevertheless, it has been widely demonstrate…
Differences in the Structural Properties and Star-formation Rates of Field and Cluster Galaxies at z~1
Allen, Rebecca J.; Kacprzak, Glenn G.; Glazebrook, Karl +5 more
We investigate the dependence of galaxy sizes and star formation rates (SFRs) on their environment using a mass-limited sample of quiescent and star-forming galaxies with log(M */{M}⊙ ) ≥ 9.5 at \bar{z}=0.92 selected from the NEWFIRM medium-band Survey (NMBS). Using the Galaxy Environment Evolution Collaboration 2 spectroscop…
On the Spin of the Black Hole in IC 10 X-1
Steiner, James F.; McClintock, Jeffrey E.; Middleton, Matthew J. +5 more
The compact X-ray source in the eclipsing X-ray binary IC 10 X-1 has reigned for years as ostensibly the most massive stellar-mass black hole, with a mass estimated to be about twice that of its closest rival. However, striking results presented recently by Laycock et al. reveal that the mass estimate, based on emission-line velocities, is unrelia…
Herschel Observations of Dusty Debris Disks
Zuckerman, B.; Song, Inseok; Melis, Carl +4 more
We present results from two Herschel observing programs using the Photodetector Array Camera and Spectrometer. During three separate campaigns, we obtained Herschel data for 24 stars at 70, 100, and 160 µm. We chose stars that were already known or suspected to have circumstellar dust based on excess infrared (IR) emission previously measure…
The K2-ESPRINT Project IV. A Hot Jupiter in a Prograde Orbit with a Possible Stellar Companion
Tamura, Motohide; Hirano, Teruyuki; Sato, Bun'ei +19 more
We report on the detection and early characterization of a hot Jupiter in a three day orbit around K2-34 (EPIC 212110888), a metal-rich F-type star located in the K2 Cycle 5 field. Our follow-up campaign involves precise radial velocity (RV) measurements and high-contrast imaging using multiple facilities. The absence of a bright nearby source in …
The Nature of Active Galactic Nuclei with Velocity Offset Emission Lines
Harrison, F. A.; Stern, D.; Müller-Sánchez, F. +1 more
We obtained Keck/OSIRIS near-IR adaptive optics-assisted integral-field spectroscopy to probe the morphology and kinematics of the ionized gas in four velocity-offset active galactic nuclei (AGNs) from the Sloan Digital Sky Survey. These objects possess optical emission lines that are offset in velocity from systemic as measured from stellar absor…
A Comprehensive Dust Model Applied to the Resolved Beta Pictoris Debris Disk from Optical to Radio Wavelengths
Rieke, George H.; Gáspár, András; Su, Kate Y. L. +1 more
We investigate whether varying the dust composition (described by the optical constants) can solve a persistent problem in debris disk modeling—the inability to fit the thermal emission without overpredicting the scattered light. We model five images of the β Pictoris disk: two in scattered light from the Hubble Space Telescope (HST)/Space Telesco…
Hubble Tarantula Treasury Project V. The Star Cluster Hodge 301: The Old Face of 30 Doradus
Panagia, N.; Larsen, S.; Lennon, D. J. +10 more
Based on color-magnitude diagrams (CMDs) from the Hubble Space Telescope Hubble Tarantula Treasury Project (HTTP) survey, we present the star formation history of Hodge 301, the oldest star cluster in the Tarantula Nebula. The HTTP photometry extends faint enough to reach, for the first time, the cluster pre-main sequence (PMS) turn-on, where the …