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Spatial Distribution of O VI Covering Fractions in the Simulated Circumgalactic Medium
Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +6 more
We use adaptive mesh refinement cosmological simulations to study the spatial distribution and covering fraction of ${\rm{O}}\,{\rm\small{VI}}$ absorption in the circumgalactic medium (CGM) as a function of projected virial radius and azimuthal angle. We compare these simulations to an observed sample of 53 galaxies from the Multiphase Galaxy Halo…
The nature of bright C-complex asteroids
Hasegawa, Sunao; Usui, Fumihiko; Kuroda, Daisuke +1 more
Most C-complex asteroids have albedo values less than 0.1, but there are some high-albedo (bright) C-complex asteroids with albedo values exceeding 0.1. To reveal the nature and origin of bright C-complex asteroids, we conducted spectroscopic observations of the asteroids at visible and near-infrared wavelengths. As a result, the bright B-, C-, an…
The Statistical Morphology of Saturn's Equatorial Energetic Neutral Atom Emission
Mitchell, D. G.; Paranicas, C.; Badman, S. V. +6 more
Saturn's magnetosphere is an efficient emitter of energetic neutral atoms (ENAs), created through charge exchange of energetic ions with the extended neutral cloud originating from the icy moon Enceladus. We present an analysis using the complete image set captured by Cassini's Ion Neutral Camera to characterize Saturn's average ENA morphology. Co…
The ROSAT Raster survey in the north ecliptic pole field. X-ray catalogue and optical identifications
Moneti, A.; Hasinger, G.; Capak, P. +4 more
The north ecliptic pole (NEP) is an important region for extragalactic surveys. Deep and wide contiguous surveys are being performed by several space observatories, most currently with the eROSITA telescope. Several more are planned for the near future. We analyse all the ROSAT pointed and survey observations in a region of 40 deg2 arou…
A CO-to-H2 Ratio of ≈10-5 toward the Herbig Ae Star HK Ori
France, Kevin; Johns-Krull, Christopher M.; Cauley, P. Wilson +1 more
Measurements of gas mass in protoplanetary gas disks form the basis for estimating the conditions of planet formation. Among the most important constraints derived from disk diagnostics are the abundances of gas-phase species critical for understanding disk chemistry. Toward this end, we present direct line-of-sight measurements of H2 a…
The first light curve solutions and period study of two contact binary systems: V1370 Tau and QQ Boo
Davoudi, Fatemeh; Poro, Atila; Rahimi, Jabar +7 more
The first light curve solutions of the binary systems V1370 Tau and QQ Boo are presented. The periodic changes are calculated, and a new ephemeris presented for each of these two binary systems. O-C analysis is performed using the MCMC method in OCFit code. The changing rate of period was measured as dP/dt= 0.2423 days/year for V1370 Tau and dP/dt…
Extremely Low Molecular Gas Content in the Vicinity of a Red Nugget Galaxy at z = 1.91
Stiavelli, M.; Lucas, R. A.; D'Amato, Q. +3 more
We present Atacama Large Millimeter/submillimeter Array Band 5 observations of a galaxy at z = 1.91, GDS24569, in search of molecular gas in its vicinity via the [C I] 3P1-3P0 line. GDS24569 is a massive ( $\mathrm{log}{M}_{* }/{M}_{\odot }=11$ ), passively evolving galaxy, characterized by compact morph…
Study of UV-bright stellar populations in the globular cluster NGC 1261 using Astrosat
Rao, N. Kameswara; Sahu, Snehalata; Subramaniam, Annapurni +2 more
We present UV photometry of the globular cluster NGC 1261 using images acquired with the Ultraviolet Imaging Telescope (UVIT) on board Astrosat. We performed point-spread function (PSF) photometry on four near-UV (NUV) and two far-UV (FUV) images and constructed UV colour-magnitude diagrams (CMDs), in combination with the Hubble Space Telescope (H…
Was Gale Crater (Mars) Connected to a Regionally Extensive Groundwater System?
Horvath, D. G.; Roseborough, V.; Palucis, M. C.
Gale crater, home of the Curiosity rover, contains some of the best geomorphic and sedimentologic evidence on Mars for large lakes during the Hesperian and Amazonian. Orbital data and rover observations of delta deposits and terminations of gully networks suggest several phases of stable lake levels. However, the regional extent, water source (gro…
Arm Tangents and the Spiral Structure of the Milky Way—The Age Gradient
Vallée, Jacques P.
From the Sun, a look at the edge of each spiral arm in our Milky Way (seen tangentially, along the line of sight) can yield numerous insights. Using different arm tracers (dust, masers, synchrotron emission, CO gas, open star clusters), we observe here for the first time an age gradient (about 12 +/-2 Myrs/kpc), much as predicted by the density wa…