Search Publications
ALMA Observations of the Largest Proto-Planetary Disk in the Orion Nebula, 114-426: A CO Silhouette
Di Francesco, James; Johnstone, Doug; Matthews, Brenda +7 more
We present ALMA observations of the largest protoplanetary disk in the Orion Nebula, 114-426. Detectable 345 GHz (856 µm) dust continuum is produced only in the 350 AU central region of the ∼1000 AU diameter silhouette seen against the bright {{H}}α background in Hubble Space Telescope images. Assuming optically thin dust emission at 345 GHz…
SHARDS: A Global View of the Star Formation Activity at z ~ 0.84 and z ~ 1.23
Barro, Guillermo; Pérez-González, Pablo G.; Koekemoer, Anton M. +22 more
In this paper, we present a comprehensive analysis of star-forming galaxies (SFGs) at intermediate redshifts (z ∼ 1). We combine the ultra-deep optical spectro-photometric data from the Survey for High-z Absorption Red and Dead Sources (SHARDS) with deep UV-to-FIR observations in the GOODS-N field. Exploiting two of the 25 SHARDS medium-band filte…
Discovery of Resolved Debris Disk around HD 131835
Chen, Christine H.; Fitzgerald, Michael P.; Graham, James R. +3 more
We report the discovery of the resolved disk around HD 131835 and present the analysis and modeling of its thermal emission. HD 131835 is a ∼15 Myr A2 star in the Scorpius-Centaurus OB association at a distance of 122.7-12.8+16.2 pc . The extended disk has been detected to ∼ 1\buildrel{\prime\prime}\over{.} 5 (200 AU) at 11.7…
High-energy Properties of the Enigmatic Be Star γ Cassiopeiae
Hamaguchi, K.; Shrader, C. R.; Oskinova, L. M. +3 more
We present the results of a broadband X-ray study of the enigmatic Be star Gamma Cassiopeiae (herein γ Cas) based on observations made with both the Suzaku and INTEGRAL observatories. γ Cas has long been recognized as the prototypical example of a small subclass of Be stars with moderately strong X-ray emission dominated by a hot thermal component…
A Novel Technique to Improve Photometry in Confused Images Using Graphs and Bayesian Priors
Ferguson, Henry C.; Somerville, Rachel S.; Inami, Hanae +2 more
We present a new technique for overcoming confusion noise in deep far-infrared Herschel space telescope images making use of prior information from shorter λ < 2 µm wavelengths. For the deepest images obtained by Herschel, the flux limit due to source confusion is about a factor of three brighter than the flux limit due to instrumental no…
Characteristics of He II Proximity Profiles
Anderson, Scott F.; Schneider, Donald P.; York, Donald G. +4 more
The proximity profile in the spectra of z≈ 3 quasars, where fluxes extend blueward of the He ii Lyα wavelength 304 (1+z) Å, is one of the most important spectral features in the study of the intergalactic medium (IGM). Based on the Hubble Space Telescope spectra of 24 He ii quasars, we find that the majority of them display a proximity profile, co…
HerMES: Current Cosmic Infrared Background Estimates Can Be Explained by Known Galaxies and Their Faint Companions at z < 4
Pérez-Fournon, I.; Valtchanov, I.; Ivison, R. J. +28 more
We report contributions to cosmic infrared background (CIB) intensities originating from known galaxies and their faint companions at submillimeter wavelengths. Using the publicly available UltraVISTA catalog and maps at 250, 350, and 500 µm from the Herschel Multi-tiered Extragalactic Survey, we perform a novel measurement that exploits the…
Kinematic and Energetic Properties of the 2012 March 12 Polar Coronal Mass Ejection
Gopalswamy, N.; Yashiro, S.; Akiyama, S.
We report on the energetics of the 2012 March 12 polar coronal mass ejection (CME) originating from a southern latitude of ∼60°. The polar CME is similar to low-latitude (LL) CMEs in almost all respects: three-part morphology; post-eruption arcade (PEA), CME, and filament kinematics; CME mass and kinetic energy; and the relative thermal energy con…
The Star Formation Rate and Metallicity of the Host Galaxy of the Dark GRB 080325 at z=1.78
Hashimoto, Tetsuya; Tanaka, Ichi; Ohta, Kouji +5 more
We present near-infrared spectroscopy of the host galaxy of the dark gamma-ray burst (GRB) 080325 using Subaru/Multi-Object Infrared Camera and Spectrograph. The obtained spectrum provides a clear detection of Hα emission and marginal [Nii]λ6584. The host is a massive (M* ∼ 1011 M⊙), dusty ({A}V∼ 1.2) st…
Luminous Red Galaxies: Selection and Classification By Combining Optical and Infrared Photometry
Rao, Sandhya M.; Newman, Jeffrey A.; Prakash, Abhishek +1 more
We describe a new method of combining optical and infrared photometry to select luminous red galaxies (LRGs) at redshifts z\gt 0.6. We explore this technique using a combination of optical photometry from CFHTLS and Hubble Space Telescope, infrared photometry from the Wide-Field Infrared Survey Explorer satellite, and spectroscopic or photometric …