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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…
Investigating the nature of the ultraluminous X-ray sources in the galaxy NGC 925
Salvaterra, R.; Wolter, A.; Belfiore, A. +7 more
Variability is a powerful tool to investigate properties of X-ray binaries (XRB), in particular for Ultraluminous X-ray sources (ULXs) that are mainly detected in the X-ray band. For most ULXs the nature of the accretor is unknown, although a few ULXs have been confirmed to be accreting at super-Eddington rates on to a neutron star (NS). Monitorin…
NOEMA observations support a recoiling black hole in 3C 186
Capetti, A.; Castignani, G.; Combes, F. +7 more
3C 186 is a powerful radio-loud quasar (a quasi-stellar object) at the center of a cool-core cluster at z = 1.06. Previous studies have reported evidence for a projected spatial offset of ∼1″ between the isophotal center of the galaxy and the point-source quasi-stellar object (QSO) as well as a spectral shift of ∼2000 km s−1 between the…
Molecules in the Carbon-rich Protoplanetary Nebula CRL 2688
Zhang, Yong; Zhang, Jiang-Shui; Nakashima, Jun-ichi +1 more
We present observations of the carbon-rich protoplanetary nebula CRL 2688 made with the Institut de Radioastronomie Millimétrique 30 m telescope in the 3 and 2 mm bands. In total, 196 transition lines belonging to 38 molecular species and isotopologues are detected, among which, to the best of our knowledge, 153 transition lines and 13 species are…
The TELPERION survey for distant [O III] clouds around luminous and hibernating AGN
Keel, William C.; Eselevich, M. V.; Smirnova, A. A. +5 more
We present a narrow-band [O III] imaging survey of 111 active galactic nucleus (AGN) hosts and 17 merging-galaxy systems, in search of distant extended emission-line regions (EELRs) around AGNs (either extant or faded). Our data reach deeper than detection from the broad-band SDSS data and cover a wider field than some early emission-line surveys …
Ultraviolet Spectroscopy and TARDIS Models of the Broad-lined Type Ic Supernova 2014ad
Foley, Ryan J.; Modjaz, Maryam; Garnavich, Peter +11 more
Few published ultraviolet (UV) spectra exist for stripped-envelope supernovae and none to date for broad-lined Type Ic supernovae (SNe Ic-bl). These objects have extremely high ejecta velocities and are the only supernova type directly linked to gamma-ray bursts (GRBs). Here we present two epochs of HST/STIS spectra of the SN Ic-bl 2014ad, the fir…
New photometry of 12 ultrashort-period late-type binary stars
Koen, C.
Candidate late-type binary stars were selected on the basis of their red g - i and r - z colours, and short (0.1159-0.2059 d) published periods. At least one cycle of variation of each star was observed in the RC and IC bands. For the five brightest stars, observations were also obtained in V. Typically ~17 standardized photo…
Near-Earth Interplanetary Coronal Mass Ejections and Their Association with DH Type II Radio Bursts During Solar Cycles 23 and 24
Joshi, Bhuwan; Moon, Yong-Jae; Cho, Kyung-Suk +2 more
We analyse the characteristics of interplanetary coronal mass ejections (ICMEs) during Solar Cycles 23 and 24. The present analysis is primarily based on the near-Earth ICME catalogue (Richardson and Cane, 2010). An important aspect of this study is to understand the near-Earth and geoeffective aspects of ICMEs in terms of their association (type …