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Search for ongoing volcanic activity on Venus: Case study of Maat Mons, Sapas Mons and Ozza Mons volcanoes
Roatsch, Th.; Basilevsky, A. T.; Markiewicz, W. J. +3 more
We report on attempts to find the ongoing volcanic activity from near-infrared night-time observations with the Venus Monitoring Camera (VMC) onboard of Venus Express. Here we consider VMC images of the areas of Maat Mons volcano and its vicinities, which, as it follows from analysis of the Magellan data, show evidence of geologically very recent …
First Science Results from SOFIA/FORCAST: The Mid-infrared View of the Compact H II Region W3A
Schoenwald, J.; Zinnecker, H.; Tielens, A. G. G. M. +10 more
The massive star-forming region W3 was observed with the faint object infrared camera for the SOFIA telescope as part of the Short Science program. The 6.4, 6.6, 7.7, 19.7, 24.2, 31.5, and 37.1 µm bandpasses were used to observe the emission of polycyclic aromatic hydrocarbon (PAH) molecules, very small grains, and big grains. Optical depth …
Study of the first productive active region in solar cycle 24
Zhang, J.; Li, L. P.; Li, T. +2 more
Context. The Sun is very quiet with less sunspots and activity since the beginning of solar cycle 24. However, the active region (AR) 11 045 emerged on February 5, 2010, is associated with 43 (8 M- and 35 C-class) flares, 53 coronal mass ejections (CMEs), 29 filament eruptions, 19 extreme ultraviolet (EUV) waves and abundant jets, indicating that …
LEMUR: Large European module for solar Ultraviolet Research. European contribution to JAXA's Solar-C mission
Fineschi, Silvano; Andretta, Vincenzo; Spadaro, Daniele +39 more
The solar outer atmosphere is an extremely dynamic environment characterized by the continuous interplay between the plasma and the magnetic field that generates and permeates it. Such interactions play a fundamental role in hugely diverse astrophysical systems, but occur at scales that cannot be studied outside the solar system. Understanding thi…
Are Large, Cometary-shaped Proplyds Really (Free-floating) Evaporating Gas Globules?
Sahai, R.; Morris, M. R.; Güsten, R.
We report the detection of strong and compact molecular line emission (in the CO J = 3-2, 4-3, 6-5, 7-6, 13CO J = 3-2, HCN, and HCO+ J = 4-3 transitions) from a cometary-shaped object (Carina-frEGG1) in the Carina star-forming region (SFR) previously classified as a photoevaporating protoplanetary disk (proplyd). We derive a …
Prospect of Studying Hard X- and Gamma-Rays from Type Ia Supernovae
Yamaguchi, H.; Diehl, R.; Tamagawa, T. +9 more
We perform multi-dimensional, time-dependent radiation transfer simulations for hard X-ray and γ-ray emissions, following radioactive decays of 56Ni and 56Co, for two-dimensional delayed-detonation models of Type Ia supernovae (SNe Ia). The synthetic spectra and light curves are compared with the sensitivities of current and …
2007 TY430: A Cold Classical Kuiper Belt Type Binary in the Plutino Population
Ragozzine, Darin; Sheppard, Scott S.; Trujillo, Chadwick
Kuiper Belt object 2007 TY430 is the first wide, equal-sized, binary known in the 3:2 mean motion resonance with Neptune. The two components have a maximum separation of about 1 arcsec and are on average less than 0.1 mag different in apparent magnitude with identical ultra-red colors (g - i = 1.49 ± 0.01 mag). Using nearly monthly observations of…
The structure of star clusters in the outer halo of M31
Chapman, S.; Davies, M. B.; Mackey, A. D. +11 more
We present a structural analysis of halo star clusters in M31 based on deep Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) imaging. The clusters in our sample span a range in galactocentric projected distance from 13 to 100 kpc and thus reside in rather remote environments. Ten of the clusters are classical globulars, whilst four a…
The Atacama Cosmology Telescope: High-resolution Sunyaev-Zel'dovich Array Observations of ACT SZE-selected Clusters from the Equatorial Strip
Hilton, Matt; Hasselfield, Matthew; Sifón, Cristóbal +41 more
We present follow-up observations with the Sunyaev-Zel'dovich Array (SZA) of optically confirmed galaxy clusters found in the equatorial survey region of the Atacama Cosmology Telescope (ACT): ACT-CL J0022-0036, ACT-CL J2051+0057, and ACT-CL J2337+0016. ACT-CL J0022-0036 is a newly discovered, massive (sime 1015 M ⊙), high-re…
A relativistic iron emission line from the neutron star low-mass X-ray binary GX 3+1
Santangelo, A.; Kaaret, P.; Egron, E. +7 more
We present the results of a spectroscopic study of the Fe Kα emission of the persistent neutron-star atoll low-mass X-ray binary and type I X-ray burster GX 3+1 with the EPIC-PN on board XMM-Newton. The source shows a flux modulation over several years and we observed it during its fainter phase, which corresponds to an X-ray luminosity of LX…