Search Publications
A New Population of Ultra-long Duration Gamma-Ray Bursts
Cenko, S. B.; Covino, S.; Sánchez-Ramírez, R. +38 more
We present comprehensive multiwavelength observations of three gamma-ray bursts (GRBs) with durations of several thousand seconds. We demonstrate that these events are extragalactic transients; in particular, we resolve the long-standing conundrum of the distance of GRB 101225A (the "Christmas-day burst"), finding it to have a redshift z = 0.847 a…
Third-epoch Magellanic Cloud Proper Motions. II. The Large Magellanic Cloud Rotation Field in Three Dimensions
van der Marel, Roeland P.; Kallivayalil, Nitya
We present the first detailed assessment of the large-scale rotation of any galaxy based on full three-dimensional velocity measurements. We do this for the LMC by combining our Hubble Space Telescope average proper motion (PM) measurements for stars in 22 fields, with existing line-of-sight (LOS) velocity measurements for 6790 individual stars. W…
Submillimeter Galaxies as Progenitors of Compact Quiescent Galaxies
Berta, S.; Magnelli, B.; Lutz, D. +16 more
Three billion years after the big bang (at redshift z = 2), half of the most massive galaxies were already old, quiescent systems with little to no residual star formation and extremely compact with stellar mass densities at least an order of magnitude larger than in low-redshift ellipticals, their descendants. Little is known about how they forme…
Water Vapor in the Spectrum of the Extrasolar Planet HD 189733b. I. The Transit
Deming, D.; Crouzet, N.; Madhusudhan, N. +1 more
We report near-infrared spectroscopy of the gas giant planet HD 189733b in transit. We used the Hubble Space Telescope Wide Field Camera 3 (HST WFC3) with its G141 grism covering 1.1 µm to 1.7 µm and spatially scanned the image across the detector at 2'' s-1. When smoothed to 75 nm bins, the local maxima of the transit depth…
Hydrogen-poor Superluminous Supernovae and Long-duration Gamma-Ray Bursts Have Similar Host Galaxies
Price, P. A.; Berger, E.; Kirshner, R. P. +27 more
We present optical spectroscopy and optical/near-IR photometry of 31 host galaxies of hydrogen-poor superluminous supernovae (SLSNe), including 15 events from the Pan-STARRS1 Medium Deep Survey. Our sample spans the redshift range 0.1 <~ z <~ 1.6, and is the first comprehensive host galaxy study of this specific subclass of cosmic explosions…
A Panchromatic View of the Restless SN 2009ip Reveals the Explosive Ejection of a Massive Star Envelope
Im, M.; Choi, C.; Campana, S. +54 more
The double explosion of SN 2009ip in 2012 raises questions about our understanding of the late stages of massive star evolution. Here we present a comprehensive study of SN 2009ip during its remarkable rebrightenings. High-cadence photometric and spectroscopic observations from the GeV to the radio band obtained from a variety of ground-based and …
Evidence for Wide-spread Active Galactic Nucleus-driven Outflows in the Most Massive z ~ 1-2 Star-forming Galaxies
Wuyts, E.; Berta, S.; Lutz, D. +35 more
In this paper, we follow up on our previous detection of nuclear ionized outflows in the most massive (log(M */M ⊙) >= 10.9) z ~ 1-3 star-forming galaxies by increasing the sample size by a factor of six (to 44 galaxies above log(M */M ⊙) >= 10.9) from a combination of the SINS/zC-SINF, LUCI, GNIRS…
The COS-Dwarfs Survey: The Carbon Reservoir around Sub-L* Galaxies
Tripp, Todd M.; Kollmeier, Juna A.; Prochaska, J. Xavier +12 more
We report new observations of circumgalactic gas from the COS-Dwarfs survey, a systematic investigation of the gaseous halos around 43 low-mass z <= 0.1 galaxies using background QSOs observed with the Cosmic Origins Spectrograph. From the projected one-dimensional and two-dimensional distribution of C IV absorption, we find that C IV is detect…
High-density Circumstellar Interaction in the Luminous Type IIn SN 2010jl: The First 1100 Days
Smith, Nathan; France, Kevin; Fransson, Claes +16 more
Hubble Space Telescope and ground-based observations of the Type IIn supernova (SN) 2010jl are analyzed, including photometry and spectroscopy in the ultraviolet, optical, and near-IR bands, 26-1128 days after first detection. At maximum, the bolometric luminosity was ~3 × 1043 erg s-1 and even at 850 days exceeds 1042
BICEP2. II. Experiment and three-year Data Set
Ade, P. A. R.; Bock, J. J.; Hildebrandt, S. R. +49 more
We report on the design and performance of the BICEP2 instrument and on its three-year data set. BICEP2 was designed to measure the polarization of the cosmic microwave background (CMB) on angular scales of 1°-5°(l = 40-200), near the expected peak of the B-mode polarization signature of primordial gravitational waves from cosmic inflation. Measur…