Search Publications
A Novel Survey for Young Substellar Objects with the W-band Filter. V. IC 348 and Barnard 5 in the Perseus Cloud
Jose, Jessy; Allers, Katelyn; Albert, Loïc +10 more
We report the discovery of substellar objects in the young star cluster IC 348 and the neighboring Barnard 5 dark cloud, both at the eastern end of the Perseus star-forming complex. The substellar candidates are selected using narrowband imaging, i.e., on and off photometric technique with a filter centered around the water absorption feature at 1…
AstroSat/UVIT Cluster Photometry in the Northern Disk of M31
Leahy, Denis; Buick, Megan; Leahy, Cameron
The Andromeda galaxy (M31) is an object of ongoing study with the Ultraviolet Imaging Telescope (UVIT) on AstroSat. UVIT far-UV (FUV) and near-UV (NUV) photometry is carried out here for a set of 239 clusters in the NE disk and bulge of M31 that overlap with the HST/PHAT survey. Padova stellar models were applied to derive ages, masses, metallicit…
Living on the edge of the Milky Way's central molecular zone. G1.3 is the more likely candidate for gas accretion into the CMZ
Menten, Karl M.; Kauffmann, Jens; Güsten, Rolf +3 more
Context. The 1°.3 (G1.3) and 1°.6 (G1.6) cloud complexes in the central molecular zone (CMZ) of our Galaxy have been proposed to possibly reside at the intersection region of the X1 and X2 orbits for several reasons. This includes the detection of co-spatial low- and high-velocity clouds, high velocity dispersion, high fractional molecular abundan…
A detailed study of the bridge of excess X-ray emission between the galaxy clusters Abell 2029 and Abell 2033
Walker, S. A.; Mirakhor, M. S.; Runge, J.
We examine Suzaku, XMM-Newton, and Chandra observations of the Abell 2029/2033 system to investigate the nature of a bridge of X-ray emission joining the two galaxy clusters. By modelling the contributions from the outskirts of the two clusters, and excluding the emission from the southern infalling group and the background group LOS9, we find a s…
Solar Polar Magnetic Fields: Comparing Full-disk and High-resolution Spectromagnetograph Data
Petrie, Gordon J. D.
This is the first systematic comparison between photospheric polar magnetic field data from a full-disk synoptic observing program, the National Solar Observatory's Synoptic Optical Long-term Investigations of the Sun Vector Spectromagnetograph (SOLIS/VSM), and a high-resolution vector spectromagnetograph, the Hinode Solar Optical Telescope Spectr…
Electron Diffusion by Magnetosonic Waves in the Earth's Radiation Belts
Meredith, Nigel P.; Wong, Jin-Mann; Horne, Richard B. +2 more
We conduct a global survey of magnetosonic waves and compute the associated bounce- and drift-averaged diffusion coefficients, taking into account colocated measurements of fpe/fce, to assess the role of magnetosonic waves in radiation belt dynamics. The average magnetosonic wave intensities increase with increasing geomagnet…
Catching a grown-up starfish planetary nebula - II. Plasma analysis and central star properties of PC 22
Morisset, C.; Guerrero, M. A.; Todt, H. +4 more
After performing the morpho-kinematic analysis of the planetary nebula (PN) PC 22, we now present its nebular and stellar analysis. The plasma investigation relies on the novel use of a Monte Carlo analysis associated with the PYNEB code for the uncertainty propagation. The innermost region of the nebula shows electronic temperatures Te…
Rate of Change of Large-Scale Solar-Wind Structure
Riley, Pete; Lockwood, Mike; Owens, Mathew J. +5 more
Quantifying the rate at which the large-scale solar-wind structure evolves is important for both understanding the physical processes occurring in the corona and for space-weather forecast improvement. Models of the global corona and heliosphere typically assume that the ambient solar-wind structure is steady and corotates with the Sun, which is g…
Constraining the formation of paleolake inlet valleys across crater rims
Goudge, Timothy A.; Fassett, Caleb I.; Osinski, Gordon R. +1 more
Impact crater lakes with an inlet valley were common on Mars during past epochs. However, it has not been established exactly how impact craters with initially high-standing rims were breached by an inlet. We investigated four potential mechanisms for inlet valley breach formation: (1) rim erosion, (2) depositional rim burial, (3) drainage head er…
Predicting the Geoeffectiveness of CMEs Using Machine Learning
Besliu-Ionescu, Diana; Paraschiv, Alin Razvan; Pricopi, Andreea-Clara +1 more
Coronal mass ejections (CMEs) are the most geoeffective space weather phenomena, being associated with large geomagnetic storms, and having the potential to cause disturbances to telecommunications, satellite network disruptions, and power grid damage and failures. Thus, considering these storms' potential effects on human activities, accurate for…