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Photometry and colour index of Comet 67P/Churyumov-Gerasimenko on 2015 December 12
Lasue, J.; Sen, A. K.; Gupta, R. +3 more
Comet 67P/Churyumov-Gerasimenko (hereafter, 67P) was observed on 2015 December 12, from 2 m Himalayan Chandra Telescope in India in photometry to study its dust properties, using Bessell R and I filters. We study the photometric images to highlight coma structures and jets. The radial decrease in intensity in the different coma structures is compa…
Suzaku observation of Jupiter's X-rays around solar maximum
Miyoshi, Yoshizumi; Ezoe, Yuichiro; Ishikawa, Kumi +6 more
We report on results of imaging and spectral studies of X-ray emission from Jupiter observed by Suzaku. In 2006, Suzaku found diffuse X-ray emission in 1-5 keV associated with Jovian inner radiation belts. It has been suggested that the emission is caused by the inverse-Compton scattering by ultra-relativistic electrons (∼50 MeV) in Jupiter's magn…
Resource potential and planning for exploration of the Hebrus Valles, Mars
Yadav, Santosh Kumar; Srivastava, Neeraj; Sharma, Ravi
Mars is the only extraterrestrial body which could host primitive lifeforms and also has the potential to host a human base in the near future. Towards fulfilling these objectives, several remote sensing missions and rover based missions have been sent to Mars. Still, confirmation of existing or extinct life on this planet in any form has not been…
Far-infrared dust properties of highly dust-obscured active galactic nuclei from the AKARI and WISE all-sky surveys
Malkan, Matthew; Lam, Anson; Wright, Edward
The combination of the AKARI and WISE infrared all-sky surveys provides a unique opportunity to identify and characterize the most highly dust-obscured active galactic nuclei (AGNs) in the universe. Dust-obscured AGNs are not easily detectable and are potentially underrepresented in extragalactic surveys due to their high optical extinction, but a…
The Gemini/HST Galaxy Cluster Project: Environment Effects on the Stellar Populations in the Lynx Clusters at z = 1.27
Toft, Sune; Jørgensen, Inger; Hunter, Laura C. +4 more
Few detailed investigations of stellar populations in passive galaxies beyond z ≈ 1 are based on deep spectroscopic observations, due to the difficulty in obtaining such data. We present a study of stellar populations, structure, and mass-to-light ratios (M/L) of a large sample of bulge-dominated galaxies in the two z = 1.27 clusters Lynx E and Ly…
Scientific innovations from the Mars aerosol optical depth based on satellite data with a temporal resolution of hours
Gebhardt, Claus; Abuelgasim, Abdelgadir
The ExoMars Trace Gas Orbiter (TGO), Emirates Mars Mission (EMM), and possible future Mars stationary satellite(s) will provide innovative data products on the optical depth of dust and water ice clouds in the Martian atmosphere with a temporal resolution of hours. The science phase of TGO has begun in April 2018, and the EMM science operation is …
Identification of Herbig Ae/Be Stars in the Small Magellanic Cloud
Zijlstra, A. A.; Simon, Joshua D.; Oliveira, Joana M. +12 more
Protoplanetary disks orbiting intermediate-mass stars, Herbig Ae/Be stars, that have formed in a metal-poor environment may evolve differently than their Galactic cousins. A study of the planet-formation process in such an environment requires identification and characterization of a sample of candidates. We have observed several stars in the Smal…
Multiple Scattering Effects in the Interplanetary Medium: Evaluation Using SOHO SWAN and MAVEN EUVM Lyman α Measurements
Quémerais, Eric; Schmidt, Walter; Thiemann, Edward +2 more
Interplanetary background measurements can be used to derive the solar flux that is illuminating the atoms in the interplanetary medium. We present a new algorithm combining measurements from the Solar Wind ANisotropies (SWAN)-Solar Heliospheric Observatory (SOHO) Lyman α photometer with Earth-based solar flux measurements to derive the solar illu…
Comparative analysis of solar radio bursts before and during CME propagation
Poedts, S.; Dididze, G.; Shergelashvili, B. M. +5 more
Context. As is well known, coronal mass ejection (CME) propagation often results in the fragmentation of the solar atmosphere on smaller regions of density (magnetic field) enhancement (depletion). It is expected that this type of fragmentation may have radio signatures.
Aims: The general aim of the present paper is to perform a comparative a…
Infrared imaging of high-mass young stellar objects: evidence of multiple shocks and of a new protostar/star eclipsing system
Tapia, Mauricio; Persi, Paolo
We present deep near- and mid-infrared images of six high-mass young stellar objects (YSOs) in order to help understand the physical mechanisms of their formation. We have searched for shocked H2 emission around such massive protostars. All but one of these regions exhibit series of molecular hydrogen emission knots, either in perfect a…