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Basaltic fissure types on Earth: Suitable analogs to evaluate the origins of volcanic terrains on the Moon and Mars?
Kobs Nawotniak, Shannon E.; Hughes, Scott S.; Elphic, Richard C. +6 more
Basaltic eruptive fissures of the Great Rift and surroundings on the eastern Snake River Plain of Idaho, USA, and selected volcanic features in Hawai'i, Iceland and northern Africa were surveyed for their relevancy as planetary analogs. Evaluated during field investigations and in satellite imagery for structures, physiography, and geologic settin…
Linking studies of tiny meteoroids, zodiacal dust, cometary dust and circumstellar disks
Lasue, J.; Milli, J.; Levasseur-Regourd, A. C. +2 more
Tiny meteoroids entering the Earth's atmosphere and inducing meteor showers have long been thought to originate partly from cometary dust. Together with other dust particles, they form a huge cloud around the Sun, the zodiacal cloud. From our previous studies of the zodiacal light, as well as other independent methods (dynamical studies, infrared …
Contribution of a Non-Thermal Component to the X-Ray Emission of OB Stars
Kholtygin, A. F.; Ryspaeva, E. B.
—In the paper the possibility of the presence of a non-thermal component described by a power law spectrum in the X-ray spectra of OB stars is investigated. The low-resolution spectra of 101 OB stars obtained using the EPIC camera on the XMM satellite are analyzed. It is concluded that the contribution of the non-thermal component of X-ray emissio…
Mapping the working of environmental effects in A963
Hwang, Ho Seong; Finoguenov, Alexis; Ziegler, Bodo +5 more
Aims: We qualitatively assess and map the relative contribution of pre-processing and cluster related processes to the build-up of
Methods: We use Voronoi binning of positions of cluster members on the plane …
Faint Stars in a Faint Galaxy. I. Ultradeep Photometry of the Boötes I Ultrafaint Dwarf Galaxy
Wyse, Rosemary F. G.; Kozhurina-Platais, Vera; Platais, Imants +2 more
We present an analysis of new, extremely deep images of the resolved stellar population of the Boötes I ultrafaint dwarf spheroidal galaxy. These new data were taken with the Hubble Space Telescope, using the Advanced Camera for Surveys (Wide Field Camera) and Wide Field Camera 3 (UVIS), with filters F606W and F814W (essentially V and I), as part …
X-ray properties of the X-CLASS-redMaPPer galaxy cluster sample: the luminosity-temperature relation
Raychaudhury, Somak; Clerc, Nicolas; Lieu, Maggie +7 more
This article presents the results of a spectroscopic analysis of the X-CLASS-redMaPPer (XC1-RM) galaxy cluster sample. X-CLASS is a serendipitous search for clusters in X-ray wavebands based on the XMM-Newton archive, whereas redMaPPer is an optical cluster catalogue derived from the Sloan Digital Sky Survey (SDSS). The present sample comprises 92…
Comparison of Multi-class and Binary Classification Machine Learning Models in Identifying Strong Gravitational Lenses
Bottrell, Connor; Fabbro, Sebastien; Teimoorinia, Hossen +1 more
Typically, binary classification lens-finding schemes are used to discriminate between lens candidates and non-lenses. However, these models often suffer from substantial false-positive classifications. Such false positives frequently occur due to images containing objects such as crowded sources, galaxies with arms, and also images with a central…
Multi-wavelength observations of the BL Lac object Fermi J1544-0649: One year after its awakening
Kong, A. K. H.; Tam, P. H. T.; Mao, J. +15 more
We report observations of a transient source Fermi J1544-0649 from radio to γ-rays. Fermi J1544-0649 was discovered by the Fermi-LAT in May 2017. Follow-up Swift-XRT observations revealed three flaring episodes through March 2018, and the peak X-ray flux is about 103 higher than the ROSAT all-sky survey (RASS) flux upper limit. Optical …
Occultation observations of Saturn's rings with Cassini VIMS
Nicholson, Philip D.; Hedman, Matthew M.; Sotin, Christophe +9 more
We describe the prediction, design, execution and calibration of stellar and solar occultation observations of Saturn's rings by the Visual and Infrared Mapping Spectrometer (VIMS) instrument on the Cassini spacecraft. Particular attention is paid to the technique developed for onboard acquisition of the stellar target and to the geometric and pho…
Modified Newtonian Gravity, Wide Binaries and the Tully-Fisher Relation
Acedo, Luis
A recent study of a sample of wide binary star systems from the Hipparcos and Gaia catalogues has found clear evidence of a gravitational anomaly of the same kind as that appearing in galaxies and galactic clusters. Instead of a relative orbital velocity decaying as the square root of the separation, ΔV∝r‑1/2, it was shown that an asymptotic const…