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Dwarf Spheroidal Galaxies in the M101 Group and Behind it
Karachentsev, I. D.; Makarova, L. N.
We use images from the Hubble Space Telescope to determine the distances to a dozen objects with low surface brightness recently observed around the bright nearby spiral M101. Only two dwarf galaxies, M101-DwA and M101-Dw9, turn out to be actual satellites of M101 at distances of about 7 Mpc. The other objects are probably members of a distant gro…
Principal component analysis of up-the-ramp sampled infrared array data
Rauscher, Bernard J.; Arendt, Richard G.; Fixsen, Dale J. +3 more
We describe the results of principal component analysis (PCA) of up-the-ramp sampled infrared (IR) array data from the Hubble Space Telescope wide field camera 3 (WFC3 IR), James Webb Space Telescope NIRSpec, and prototype Wide Field Infrared Survey Telescope's wide field instrument detectors. These systems use, respectively, Teledyne H1R, H2RG, a…
Search for multiwavelength emission from the binary millisecond pulsar PSR J1836-2354A in the globular cluster M22
de Martino, D.; Di Salvo, T.; Iaria, R. +5 more
We present a multiband search for X-ray, optical, and γ-ray emission of the radio binary millisecond pulsar J1836-2354A, hosted in the globular cluster M22. X-ray emission is significantly detected in two Chandra observations, performed in 2005 and 2014, at a luminosity of ∼2-3 × 1030 erg s-1, in the 0.5-8 keV energy range. T…
Monitoring of the D doublet of neutral sodium during transits of two `evaporating' planets
Hirano, T.; Ansdell, M.; Gaidos, E.
Spectroscopic transit detection of constituents in winds from `evaporating' planets on close-in transiting orbits could provide desperately needed information on the composition, formation, and orbital evolution of such objects. We obtained high-resolution optical spectra of the host stars during a single transit of Kepler-1520b and two transits o…
Understanding the Plasma and Magnetic Field Evolution of a Filament Using Observations and Nonlinear Force-free Field Modeling
Savcheva, Antonia; van Driel-Gesztelyi, Lidia; Green, Lucie M. +4 more
We present observations and magnetic field models of an intermediate filament present on the Sun in 2012 August, associated with a polarity inversion line that extends from AR 11541 in the east into the quiet Sun at its western end. A combination of Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly, SDO/Helioseismic and Magnetic Imager…
Depth of the dynamo region and zonal circulation of the molecular layer in Saturn inferred from its equatorially symmetric gravitational field
Schubert, Gerald; Kong, Dali; Zhang, Keke
The high-precision equatorially symmetric gravitational field of Saturn (the even gravitational coefficients J2, J4, …, J12) measured by the Cassini Grand Finale reflects its internal structure, its non-spherical shape caused by rotation and its strong zonal circulation whose location is controlled by the depth of …
Blue Straggler Stars beyond the Milky Way. IV. Radial Distributions and Dynamical Implications
Sills, Alison; Hong, Jongsuk; Deng, Licai +3 more
Blue straggler stars (BSSs) have been proposed as powerful indicators to measure the dynamical state of Galactic globular clusters (GCs). Here we examine for the first time whether this framework of BSSs as dynamical clocks, which was specifically developed for Galactic GCs, may also hold for younger GCs in the Large Magellanic Cloud (LMC). Using …
VALES V: a kinematic analysis of the molecular gas content in H-ATLAS galaxies at z ∼ 0.03-0.35 using ALMA
Leiton, R.; Bauer, F. E.; Farrah, D. +19 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) resolved observations of molecular gas in galaxies up to z = 0.35 to characterize the role of global galactic dynamics on the global interstellar medium properties. These observations consist of a sub-sample of 39 galaxies taken from the Valparaíso ALMA Line Emission Survey (VALES). Fr…
Hα emission-line stars in molecular clouds. III. Canis Major
Reipurth, Bo; Pettersson, Bertil
A deep objective-prism survey for Hα emission stars towards the Canis Major star-forming clouds was performed. A total of 398 Hα emitters were detected, 353 of which are new detections. There is a strong concentration of these Hα emitters towards the molecular clouds surrounding the CMa OB1 association, and it is likely that these stars are young …
Analysis of Quiescent Corona X-ray Spectra from SphinX During the 2009 Solar Minimum
Phillips, K. J. H.; Sylwester, B.; Sylwester, J. +3 more
The SphinX X-ray spectrophotometer on the CORONAS-PHOTON mission observed the 1 - 15 keV X-ray spectrum of the spatially integrated solar corona during the deep minimum of 2009, when solar activity was exceptionally low. Its sensitivity for energies >1.2 keV was higher than that of any other solar X-ray spectrometer in orbit at the time, includ…