Search Publications
The Discovery of the Most Distant Known Type Ia Supernova at Redshift 1.914
Ferguson, Henry C.; Grogin, Norman A.; Weiner, Benjamin J. +22 more
We present the discovery of a Type Ia supernova (SN) at redshift z = 1.914 from the CANDELS multi-cycle treasury program on the Hubble Space Telescope (HST). This SN was discovered in the infrared using the Wide-Field Camera 3, and it is the highest-redshift Type Ia SN yet observed. We classify this object as a SN Ia by comparing its light curve a…
Far-ultraviolet Detection of the Suspected Subdwarf Companion to the Be Star 59 Cygni
Gies, Douglas R.; Peters, Geraldine J.; Pewett, Tiffany D. +2 more
We report on the detection of a hot subdwarf component in the Be binary system, 59 Cygni. The spectral signature is found in cross-correlation functions of photospheric model spectra with far-ultraviolet spectra obtained by the International Ultraviolet Explorer Satellite, and we used radial velocities from the cross-correlation functions to deter…
The Progenitor of Supernova 2011dh has Vanished
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Cenko, S. Bradley +7 more
We conducted Hubble Space Telescope (HST) Snapshot observations of the Type IIb supernova (SN) 2011dh in M51 at an age of ~641 days with the Wide Field Camera 3. We find that the yellow supergiant star, clearly detected in pre-SN HST images, has disappeared, implying that this star was almost certainly the progenitor of the SN. Interpretation of t…
The Importance of Physical Models for Deriving Dust Masses and Grain Size Distributions in Supernova Ejecta. I. Radiatively Heated Dust in the Crab Nebula
Temim, Tea; Dwek, Eli
Recent far-infrared (IR) observations of supernova remnants (SNRs) have revealed significantly large amounts of newly condensed dust in their ejecta, comparable to the total mass of available refractory elements. The dust masses derived from these observations assume that all the grains of a given species radiate at the same temperature, regardles…
Albedo Properties of Main Belt Asteroids Based on the All-Sky Survey of the Infrared Astronomical Satellite AKARI
Hasegawa, Sunao; Usui, Fumihiko; Ootsubo, Takafumi +5 more
We present an analysis of the albedo properties of main belt asteroids (MBAs) detected by the All-Sky Survey of the infrared astronomical satellite AKARI. The characteristics of 5120 asteroids detected by the survey, including their sizes and albedos, were cataloged in the Asteroid Catalog Using AKARI (AcuA). Size and albedo measurements were base…
The Anatomy of an Extreme Starburst within 1.3 Gyr of the Big Bang Revealed by ALMA
Maiolino, R.; Walter, F.; Riechers, D. +5 more
We present further analysis of the [C II] 158 µm fine structure line and thermal dust continuum emission from the archetype extreme starburst/active galactic nucleus (AGN) group of galaxies in the early universe, BRI 1202-0725 at z = 4.7, using the Atacama Large Millimeter Array. The group has long been noted for having a closely separated (…
The Bivariate Size-Luminosity Relations for Lyman Break Galaxies at z ~ 4-5
Ferguson, Henry C.; Ravindranath, Swara; Huang, Kuang-Han +1 more
We study the bivariate size-luminosity distribution of Lyman break galaxies (LBGs) selected at redshifts around 4 and 5 in GOODS and the HUDF fields. We model the size-luminosity distribution as a combination of log-normal distribution (in size) and Schechter function (in luminosity), therefore it enables a more detailed study of the selection eff…
The Metallicity Evolution of Star-forming Galaxies from Redshift 0 to 3: Combining Magnitude-limited Survey with Gravitational Lensing
Richard, J.; Yuan, T. -T.; Kewley, L. J.
We present a comprehensive observational study of the gas-phase metallicity of star-forming galaxies from z ~ 0 → 3. We combine our new sample of gravitationally lensed galaxies with existing lensed and non-lensed samples to conduct a large investigation into the mass-metallicity (MZ) relation at z > 1. We apply a self-consistent metallicity ca…
The Intriguing Stellar Populations in the Globular Clusters NGC 6388 and NGC 6441
Anderson, J.; Milone, A. P.; Sarajedini, A. +8 more
NGC 6388 and NGC 6441 are two massive Galactic bulge globular clusters that share many properties, including the presence of an extended horizontal branch (HB), quite unexpected because of their high metal content. In this paper we use Hubble Space Telescope's WFPC2, ACS, and WFC3 images and present a broad multicolor study of their stellar conten…
Herschel Exploitation of Local Galaxy Andromeda (HELGA). III. The Star Formation Law in M31
Gordon, Karl D.; Lebouteiller, Vianney; Wilson, Christine D. +17 more
We present a detailed study of how the star formation rate (SFR) relates to the interstellar medium (ISM) of M31 at ~140 pc scales. The SFR is calculated using the far-ultraviolet and 24 µm emission, corrected for the old stellar population in M31. We find a global value for the SFR of 0.25^{+0.06}_{-0.04}\,M_{\odot }\,yr^{-1} and compare th…