Search Publications
GeMs/GSAOI observations of La Serena 94: an old and far open cluster inside the solar circle
Carrasco, Eleazar R.; Roman-Lopes, Alexandre; Neichel, Benoit +2 more
Physical properties were derived for the candidate open cluster La Serena 94, recently unveiled by the VISTA Variables in the Vía Láctea (VVV) survey. Thanks to the exquisite angular resolution provided by Gemini South multiconjugate adaptive optics system/Gemini South Adaptive Optics Imager (GeMS/GSAOI), we could characterize this system in detai…
Mass loading at the magnetopause through the plasmaspheric plume
Tu, Jiannan; Wang, Yan; Song, Paul
An investigation of the transport of the plasmaspheric plasma to the dayside magnetopause under disturbed geomagnetic conditions associated with plasmaspheric plumes is conducted by numerical simulations using the Dynamic Fluid-Kinetic (DyFK) model. The simulations present the field-aligned density distributions and kinetic features of multiple io…
Evidence of scattering effects influenced by plasma flows in C VI 1548 Å, 1550 Å spectral lines emitted from the Sun
Vial, J. -C.; Gontikakis, C.
Aims: We search for, and study, individual spectral profiles where the complex shape of the C iv 1548 Å line is different from the shape of the simultaneously recorded C iv 1550 Å line. Such an asymmetry is not expected for line emission resulting from collisional excitation. Therefore we propose an explanation of these observations through t…
Unique Spectroscopy and Imaging of Mars with the James Webb Space Telescope
Hartogh, Paul; Lellouch, Emmanuel; Fouchet, Thierry +12 more
In this paper, we summarize the main capabilities of the James Webb Space Telescope (JWST) for performing observations of Mars. The distinctive vantage point of JWST at the Sun-Earth Lagrange point (L2) will allow sampling the full observable disk, permitting the study of short-term phenomena, diurnal processes (across the east-west axis), and lat…
Probing the photoionised outflow in the NLS1 Arakelian 564: An XMM-Newton view
Khanna, Shourya; Kaastra, Jelle. S.; Mehdipour, Missagh
We present a detailed analysis of XMM-Newton X-ray observations of the narrow-line Seyfert-1 (NLS1) galaxy Ark 564, taken between 2000 and 2011. High-resolution X-ray spectroscopy was carried out on the resultant high signal-to-noise stacked spectrum. We find three separate photoionised warm absorbers, which outflow at velocities unusually lower t…
The sun's influence on the vertical structure of the ionospheres of Venus and Mars
Girazian, Zachary Richard James
The ionospheres of Venus and Mars are important components of the planet-space boundary that play a major role in atmospheric escape processes. Characterization of these regions reveals the physical processes that control them and provides a foundation for more detailed studies of chemistry, dynamics, and energetics. At both planets the ionosphere…
Observations of corotating solar wind structures at radio sounding by signals of the Rosetta and Mars Express spacecraft
Pätzold, M.; Bird, M. K.; Efimov, A. I. +3 more
In the implementation of the space projects Rosetta and Mars Express, a large-scale series of experiments has been carried out on radio sounding circumsolar plasma by decimeter ( S-band) and centimeter ( X-band) signals of the Rosetta comet probe (from October 3 to October 31, 2010) and the Mars Express satellite of Mars (from December 25, 2010 to…
Gas-to-dust ratios in massive star-forming galaxies at z ∼ 1.4
Iono, Daisuke; Hatsukade, Bunyo; Ohta, Kouji +3 more
We present results of 12CO(J = 2-1) observations toward four massive star-forming galaxies at z ∼ 1.4 with the Nobeyama 45 m radio telescope. The galaxies are detected with Spitzer/MIPS in 24 µm and Herschel/SPIRE in 250 µm and 350 µm, and they mostly reside in the main sequence. Their gas-phase metallicities derived b…
Simultaneously modelling far-infrared dust emission and its relation to CO emission in star-forming galaxies
Klessen, Ralf S.; Cormier, Diane; Roman-Duval, Julia +6 more
We present a method to simultaneously model the dust far-infrared (FIR) spectral energy distribution (SED) and the total infrared - carbon monoxide (CO) integrated intensity (SIR-ICO) relationship. The modelling employs a hierarchical Bayesian (HB) technique to estimate the dust surface density, temperature (Teff),…
A low-luminosity type-1 QSO sample . IV. Molecular gas contents and conditions of star formation in three nearby Seyfert galaxies
Eckart, Andreas; Moser, Lydia; Krips, Melanie +8 more
We present a pilot study of ~3'' resolution observations of low CO transitions with the Submillimeter Array in three nearby Seyfert galaxies, which are part of the low-luminosity quasi-stellar object (LLQSOs) sample consisting of 99 nearby (z = 0.06) type-1 active galactic nuclei (AGN) taken from the Hamburg/ESO quasi-stellar object (QSO) survey. …