Search Publications
Seasonal Disappearance of Far-infrared Haze in Titan's Stratosphere
Calcutt, S. B.; de Kok, R.; Flasar, F. M. +9 more
A far-infrared emission band attributed to volatile or refractory haze in Titan's stratosphere has been decreasing in intensity since Cassini's arrival in 2004. The 220 cm-1 feature, first seen by the Voyager Infrared Interferometer Spectrometer, has only been found in Titan's winter polar region. The emission peaks at about 140 km alti…
Observations of a Two-stage Solar Eruptive Event (SEE): Evidence for Secondary Heating
Veronig, Astrid; Chamberlin, Phillip C.; Su, Yang +4 more
We present RHESSI, SDO/AIA, SOHO/LASCO, STEREO, and GOES observations of a partially occulted solar eruptive event that occurred at the southwest limb on 2011 March 8. The GOES X-ray light curve shows two peaks separated by almost 2 hr that we interpret as two stages of a single event associated with the delayed eruption of a coronal mass ejection…
A Link to the Past: Using Markov Chain Monte Carlo Fitting to Constrain Fundamental Parameters of High-redshift Galaxies
Koekemoer, Anton; Malhotra, Sangeeta; Rhoads, James +4 more
We have developed a new method for fitting spectral energy distributions (SEDs) to identify and constrain the physical properties of high-redshift (4 < z < 8) galaxies. Our approach uses an implementation of Bayesian based Markov Chain Monte Carlo that we have dubbed "πMC2." It allows us to compare observations to arbitrarily comp…
Analysis of a Fragmenting Sunspot Using Hinode Observations
Venkatakrishnan, P.; Ravindra, B.; Mathew, Shibu K. +3 more
We employ high-resolution filtergrams and polarimetric measurements from Hinode to follow the evolution of a sunspot for eight days starting on 2007 June 28. The imaging data were corrected for intensity gradients, projection effects, and instrumental stray light prior to the analysis. The observations show the formation of a light bridge at one c…
Passive and Star-forming Galaxies at 1.4 <= z <= 2.5 in the AEGIS Field
Fang, Guanwen; Kong, Xu; Chen, Yang +1 more
Using a simple two-color selection based on g-, z-, and K-band photometry, we choose from 1609 star-forming galaxies (sgzKs) and 422 passively evolving galaxies (pgzKs) at z ~ 2 from a K-band-selected sample (K AB < 22.0) in an area of ~0.44 deg2 of the All-wavelength Extended Groth Strip International Survey. The number o…
Intrinsic Shape of Star-forming BzK Galaxies. II. Rest-frame Ultraviolet and Optical Structures in GOODS-South and SXDS
Ohta, Kouji; Yabe, Kiyoto; Yuma, Suraphong
We study the statistical intrinsic shape of star-forming BzK galaxies (sBzK galaxies) at z ~ 2 in both rest-frame UV and rest-frame optical wavelengths. The sBzK galaxies are selected down to KAB = 24.0 mag in the GOODS-S and Subaru-XMM Deep Survey (SXDS) fields, where high-resolution images from the Hubble Space Telescope are publicly …
First Study of Dark Matter Properties with Detected Solar Gravity Modes and Neutrinos
García, R. A.; Mathur, S.; Lopes, I. +5 more
We derive new limits on the cold dark matter properties for weakly interacting massive particles (WIMPs), potentially trapped in the solar core by using for the first time the central temperature constrained by boron neutrinos and the central density constrained by the dipolar gravity modes detected with the Global Oscillations at Low Frequency/So…
WISE/NEOWISE Preliminary Analysis and Highlights of the 67p/Churyumov-Gerasimenko near Nucleus Environs
Masiero, Joseph R.; Wright, Edward L.; Tholen, David J. +15 more
On 2010 January 18-19 and June 28-29, the Wide-field Infrared Survey Explorer (WISE) spacecraft imaged the Rosetta mission target, comet 67P/Churyumov-Gerasimenko. We present a preliminary analysis of the images, which provide a characterization of the dust environment at heliocentric distances similar to those planned for the initial spacecraft e…
Optical and Infrared Analysis of Type II SN 2006bc
Barlow, M. J.; Clayton, Geoffrey C.; Meixner, M. +8 more
We present nebular phase optical imaging and spectroscopy and near/mid-IR imaging of the Type II SN 2006bc. Observations reveal the central wavelength of the symmetric Hα line profile to be redshifted with respect to the host galaxy Hα emission by day 325. Such a phenomenon has been argued to result from an asymmetric explosion in the iron-peak el…
Brightness and Fluctuation of the Mid-infrared Sky from AKARI Observations toward the North Ecliptic Pole
Jeong, Woong-Seob; Matsuura, Shuji; Matsumoto, Toshio +1 more
We present the smoothness of the mid-infrared sky from observations by the Japanese infrared astronomical satellite AKARI. AKARI monitored the north ecliptic pole (NEP) during its cold phase with nine wave bands covering from 2.4 to 24 µm, out of which six mid-infrared bands were used in this study. We applied power-spectrum analysis to the …