Search Publications
Coeval Intermediate-mass Star Formation in N4W
Chen, Zhiwei; Kwon, Jungmi; Tamura, Motohide +3 more
Protostars are mostly found in star-forming regions, where the natal molecular gas still remains. At about 5\prime west of the molecular bubble N4, N4W is identified as a star-forming clump hosting three Class II (IRS 1-3), and one Class I (IRS 4) young stellar objects (YSOs), as well as a submillimeter source SMM1. The near-IR polariza…
CO2 non-LTE limb emissions in Mars' atmosphere as observed by OMEGA/Mars Express
Gondet, B.; Forget, F.; Altieri, F. +7 more
We report on daytime limb observations of Mars upper atmosphere acquired by the OMEGA instrument on board the European spacecraft Mars Express. The strong emission observed at 4.3 µm is interpreted as due to CO2 fluorescence of solar radiation and is detected at a tangent altitude in between 60 and 110 km. The main value of OMEGA …
Temporal features of LS I +61°303 in hard X-rays from the Swift/BAT survey data
Cusumano, G.; La Parola, V.; Segreto, A. +2 more
We study the long-term spectral and timing behaviour of LS I +61°303 in hard X-rays (15-150 keV) using ∼10 years of survey data from the Swift Burst Alert Telescope (BAT) monitor. We focus on the detection of long periodicities known to be present in this source in multiple wavelengths. We clearly detect three periods: the shorter one at 26.48 d i…
The DISR imaging mosaic of Titan's surface and its dependence on emission angle
Karkoschka, Erich; Schröder, Stefan E.
The DISR (Descent Image/Spectral Radiometer) imagers took about 300 images during the descent of the Huygens probe in Titan's atmosphere. We combined them into a photometrically calibrated mosaic of Titan's surface within 100 km of the Huygens landing site with a resolution ranging from 1 km at 100 km distance from the landing site to 50 cm near t…
Clouds and hazes vertical structure of a Saturn's giant vortex from Cassini/VIMS-V data analysis
Oliva, F.; D'Aversa, E.; Moriconi, M. L. +3 more
We studied the evolution of a giant tropospheric vortex formed in the wake of the storm that encircled Saturn from December 2010 to July 2011 (Fletcher et al. [2011a] Science, 332, 1413-1417; Fletcher et al. [2012] Icarus, 221, 560-586; Sánchez-Lavega et al. [2011] Nature, 475, 71-74; Sánchez-Lavega et al. [2012] Icarus, 220, 561-576; Sayanagi et …
What Is the Source of Quiet Sun Transition Region Emission?
De Pontieu, Bart; Schmit, D. J.
Dating back to the first observations of the on-disk corona, there has been a qualitative link between the photosphere’s magnetic network and enhanced transition-temperature plasma emission. These observations led to the development of a general model that describes emission structures through the partitioning of the atmospheric volume with differ…
X-ray Emission and Orientation of Selected PF Galaxy Clusters
Tugay, A. V.; Dylda, S. S.; Panko, E. A.
X-ray counterparts for 35 galaxy clusters contained in the PF catalogue of galaxy clusters and groups were found in XMM-Newton archive. 22 ones (all from ACO catalogue) have extended elliptic X-ray haloes appropriate for determination of orientation. Position angles and eccentricities were calculated and compared with cluster orientations optical …
Distinct characteristics of asymmetric magnetic reconnections: Observational results from the exhaust region at the dayside magnetopause
Zhang, Y. C.
Magnetic reconnection plays a key role in the conversion of magnetic energy into the thermal and kinetic energy of plasma. On either side of the diffusion region in space plasma, the conditions for the occurrence of reconnections are usually not symmetric. Previous theoretical studies have predicted that reconnections under asymmetric conditions w…
A study of cosmic ray flux based on the noise in raw CCD data from solar images
Qin, G.; Shen, Z. -N.
Raw solar images from CCDs are often contaminated with single-pixel noise which is thought to be made by cosmic ray hits. The cosmic ray-affected pixels are usually outstanding when compared with the perimeter zone. In this work, we use a method based on the median filtering algorithm to identify and count the cosmic ray traces from SOHO/EIT solar…
Hubble Space Telescope Observations of Active Asteroid 324P/La Sagra
Mutchler, Max; Jewitt, David; Agarwal, Jessica +3 more
Hubble Space Telescope observations of active asteroid 324P/La Sagra near perihelion show continued mass loss consistent with the sublimation of near-surface ice. Isophotes of the coma measured from a vantage point below the orbital plane are best matched by steady emission of particles having a nominal size of a ∼ 100 µm. The inferred rate …