Search Publications
Hubble Space Telescope and HI Imaging of Strong Ram Pressure Stripping in the Coma Spiral NGC 4921: Dense Cloud Decoupling and Evidence for Magnetic Binding in the ISM
Kenney, Jeffrey D. P.; Abramson, Anne; Bravo-Alfaro, Hector
Remarkable dust extinction features in the deep Hubble Space Telescope (HST) V and I images of the face-on Coma cluster spiral galaxy NGC 4921 show in unprecedented ways how ram pressure strips the ISM from the disk of a spiral galaxy. New VLA HI maps show a truncated and highly asymmetric HI disk with a compressed HI distribution in the NW, provi…
The Grism Lens-Amplified Survey from Space (GLASS). II. Gas-Phase Metallicity and Radial Gradients in an Interacting System At Z ≃ 2
Malkan, M. A.; Bradač, M.; Treu, T. +8 more
We present spatially resolved gas-phase metallicity for a system of three galaxies at z = 1.85 detected in the Grism Lens-Amplified Survey from Space (GLASS). The combination of Hubble Space Telescope (HST’s) diffraction limit and strong gravitational lensing by the cluster MACS J0717+3745 results in a spatial resolution of ≃200-300 pc, enabling g…
Observations of Binary Stars with the Differential Speckle Survey Instrument. VI. Measures during 2014 at the Discovery Channel Telescope
van Belle, Gerard T.; Everett, Mark E.; Bjorkman, Karen S. +3 more
We present the results of 938 speckle measures of double stars and suspected double stars drawn mainly from the Hipparcos Catalog, as well as 208 observations where no companion was noted. One hundred fourteen pairs have been resolved for the first time. The data were obtained during four observing runs in 2014 using the Differential Speckle Surve…
Optical Spectroscopic Observations of Gamma-ray Blazar Candidates. IV. Results of the 2014 Follow-up Campaign
Stern, D.; Smith, Howard A.; Masetti, N. +7 more
The extragalactic γ-ray sky is dominated by the emission arising from blazars, one of the most peculiar classes of radio-loud active galaxies. Since the launch of Fermi several methods were developed to search for blazars as potential counterparts of unidentified γ-ray sources (UGSs). To confirm the nature of the selected candidates, optical spect…
A WFC3 Grism Emission Line Redshift Catalog in the GOODS-South Field
Finkelstein, Steven L.; Barro, Guillermo; Ferguson, Henry C. +19 more
We combine Hubble Space Telescope (HST)/Wide Field Camera3 (WFC3) imaging and G141 grism observations from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) and 3D-HST surveys to produce a catalog of grism spectroscopic redshifts for galaxies in the CANDELS/GOODS-South field. The WFC3/G141 grism spectra cover a wavelengt…
Panchromatic Hubble Andromeda Treasury. XII. Mapping Stellar Metallicity Distributions in M31
Monachesi, Antonela; Dolphin, Andrew E.; Skillman, Evan D. +14 more
We present a study of spatial variations in the metallicity of old red giant branch stars in the Andromeda galaxy. Photometric metallicity estimates are derived by interpolating isochrones for over seven million stars in the Panchromatic Hubble Andromeda Treasury (PHAT) survey. This is the first systematic study of stellar metallicities over the i…
The Team Keck Redshift Survey 2: MOSFIRE Spectroscopy of the GOODS-North Field
Barro, Guillermo; Trump, Jonathan R.; Faber, S. M. +9 more
We present the Team Keck Redshift Survey 2 (TKRS2), a near-infrared spectral observing program targeting selected galaxies within the CANDELS subsection of the GOODS-North Field. The TKRS2 program exploits the unique capabilities of the Multi-Object Spectrometer For Infra-Red Exploration (MOSFIRE), which entered service on the Keck I telescope in …
Hubble Space Telescope High-Resolution Imaging of Kepler Small and Cool Exoplanet Host Stars
Kalas, Paul; Wright, Jason T.; Ciardi, David R. +3 more
High-resolution imaging is an important tool for follow-up study of exoplanet candidates found via transit detection with the Kepler mission. We discuss here Hubble Space Telescope imaging with the WFC3 of 23 stars that host particularly interesting Kepler planet candidates based on their small size and cool equilibrium temperature estimates. Resu…
A Survey of Irradiated Pillars, Globules, and Jets in the Carina Nebula
Smith, N.; Bally, J.; Hartigan, P. +1 more
We present wide-field, deep narrowband H2, Brγ, Hα, [S ii], [O iii], and broadband I- and K-band images of the Carina star formation region. The new images provide a large-scale overview of all the H2 and Brγ emission present in over a square degree centered on this signature star-forming complex. By comparing these images wi…
The Ch-class Asteroids: Connecting a Visible Taxonomic Class to a 3 µm Band Shape
Emery, Joshua P.; Rivkin, Andrew S.; Thomas, Cristina A. +1 more
Asteroids belonging to the Ch spectral taxonomic class are defined by the presence of an absorption near 0.7 µm, which is interpreted as due to Fe-bearing phyllosilicates. Phyllosilicates also cause strong absorptions in the 3 µm region, as do other hydrated and hydroxylated minerals and H2O ice. Over the past decade, spectr…