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Evolution of the Three-dimensional Shape of Passively Evolving and Star-forming Galaxies at z < 1
Kajisawa, Masaru; Satoh, Yuki K.; Himoto, Kazuharu G.
Using the HST/ACS I F814W-band data, we investigated the distribution of apparent axial ratios of ∼21,000 galaxies with M V < -20 at 0.2 < z < 1.0 in the COSMOS field as a function of stellar mass, specific star formation rate (sSFR), and redshift. We statistically estimated intrinsic 3D shapes of these galaxies by…
Spatially resolving the atmosphere of the non-Mira-type AGB star SW Vir in near-infrared molecular and atomic lines with VLTI/AMBER
Ohnaka, K.; Hadjara, M.; Maluenda Berna, M. Y. L.
Aims: We present a near-infrared spectro-interferometric observation of the non-Mira-type, semiregular asymptotic giant branch star SW Vir. Our aim is to probe the physical properties of the outer atmosphere with spatially resolved data in individual molecular and atomic lines.
Methods: We observed SW Vir in the spectral window between 2…
Current Density in Saturn's Equatorial Current Sheet: Cassini Magnetometer Observations
Arridge, C. S.; Martin, C. J.
The equatorial current sheet at Saturn is the result of a rapidly rotating magnetosphere. The sheet itself exhibits periodic seasonal and diurnal movements as well as aperiodic movements of a currently unknown origin, along with periodic thickening and thinning of the magnetodisc, and azimuthal changes in the thickness due to local effects in the …
Observing Exoplanets in the Near-Infrared from a High Altitude Balloon Platform
Parmentier, Vivien; Lewis, Nikole K.; Pascale, Enzo +8 more
Although there exists a large sample of known exoplanets, little data exists that can be used to study their global atmospheric properties. This deficiency can be addressed by performing phase-resolved spectroscopy — continuous spectroscopic observations of a planet’s entire orbit about its host star — of transiting exoplanets. Planets with charac…
On the structure of the Pleiades cluster
Krełowski, J.; Galazutdinov, G. A.; Strobel, A. +2 more
The data available on the distances (both from Gaia DR2 and those determined from interstellar Ca II lines) to the brightest stars in the Pleiades (`Seven Sisters' and their `parents') suggest that these stars highly likely do not form a compact cluster but are localized in front of the main (Pleiades) cluster - at a distance close to that given b…
Qatar Exoplanet Survey: Qatar-7b—A Very Hot Jupiter Orbiting a Metal-rich F-Star
Bieryla, Allyson; Latham, David W.; Esquerdo, Gilbert A. +18 more
We present the discovery of Qatar-7b—a very hot and inflated giant gas planet orbiting close to its parent star. The host star is a relatively massive main-sequence F-star with mass and radius {M}\star =1.41+/- 0.03 {M}⊙ and {R}\star =1.56+/- 0.02 {R}⊙ , respectively, at a distance d = 726 ± 26 pc, and …
On the geometry of the X-ray emission from pulsars: the changing aspect of the Be/X-ray pulsar SXP348
Zezas, A.; Coe, M. J.; Laycock, S. G. T. +2 more
The X-ray source SXP348 is a high-mass X-ray binary system in the Small Magellanic Cloud. Since its 1998 discovery by BeppoSAX, this pulsar has exhibited a spin period of ∼340-350 s. In an effort to determine the orientation and magnetic geometry of this source, we used our geometric model Polestar to fit 71 separate pulse profiles extracted from …
Jupiter's Turbulent Power Spectra From Hubble Space Telescope
Morales-Juberías, Raúl; Simon, Amy; Cosentino, Richard G.
Turbulence in Jupiter's atmosphere was investigated with archival and ongoing observations from the Hubble Space Telescope. Data sets that include one full rotation (360° longitude coverage) were used to produce complete maps of the planet's upper cloud layer. The global maps were analyzed to generate the passive tracer power spectrum of cloud fea…
A three-dimensional model of spiral null pair to form ion-scale flux ropes in magnetic reconnection region observed by Cluster
Dunlop, Malcolm; He, Jiansen; Xie, Lun +10 more
The magnetic structure and topology of the three-dimensional magnetic reconnection region are significantly dynamic and complex. Small-scale flux ropes and magnetic null points are frequently detected in the reconnection outflow region and diffusion region due to the increased in situ measurements at high temporal cadences. Previous studies have d…
NGC 7457: evidence for merger-driven cylindrical rotation in disc galaxies
Peletier, R. F.; Falcón-Barroso, J.; Aguerri, J. A. L. +7 more
We construct Schwarzschild orbit-based models of NGC 7457, known as a peculiar low-mass lenticular galaxy. Our best-fitting model successfully retrieves most of the unusual kinematics behaviours of this galaxy, in which, the orbital distribution of stars is dominated by warm and hot orbits. The reconstructed surface brightness of the hot component…