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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…
Dust levitation as a major resurfacing process on the surface of a saturnian icy satellite, Atlas
Hirata, Naoyuki; Miyamoto, Hideaki
A small inner satellite of Saturn, Atlas, has an enigmatic saucer-like shape explained by an accumulation of particles from A-ring of Saturn. However, its unusual smooth surface remains unexplained. Gardening through continuous particle impact events cannot be a unique explanation for the smoothness, because Prometheus does not exhibit a similar s…
The distribution of carbon monoxide in the lower atmosphere of Venus
Bailey, Jeremy; Cotton, Daniel V.; Crisp, D. +1 more
We have obtained spatially resolved near-infrared spectroscopy of the Venus nightside on 15 nights over three observing seasons. We use the depth of the CO absorption band at 2.3 µm to map the two-dimensional distribution of CO across both hemispheres. Radiative transfer models are used to relate the measured CO band depth to the volume mixi…
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…
Determining the axial direction of high-shear flux transfer events: Implications for models of FTE structure
Milan, S. E.; Fear, R. C.; Oksavik, K.
Flux transfer events are bursts of dayside reconnection, which give rise to local perturbations of the magnetic field that can be observed by spacecraft near the magnetopause. Although it is commonly accepted that flux transfer events are caused by reconnection, various models exist to explain their structure. A key difference between mechanisms i…
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 …
Lunar iron abundance determination using the 2-µm absorption band parameters
Bhatt, Megha; Mall, Urs; Bugiolacchi, Roberto +4 more
In this work we report the first employment of the 2-µm absorption band parameters to estimate FeO weight percentage (wt.%) abundances from high-resolution Near-Infrared (NIR) lunar data, as measured by the SIR-2 instrument on board Chandrayaan-1. Our method is based on the algorithm originally developed by Le Mouélic et al. (Le Mouélic, S.,…