Search Publications
NGC 2403 XMM4: evidence for a super-Eddington neutron star with a possible transient pulsation
Roberts, Timothy P.; Luangtip, Wasutep
We present a study of the X-ray source NGC 2403 XMM4 (4XMM J073702.2+653934) based on 20 yr of archival observations with XMM-Newton, Chandra, Swift, and NuSTAR. Although it has previously been classified as an ultraluminous X-ray source (ULX), we show that its luminosity rarely, if ever, passes the $10^{39} \rm \, erg \, s^{-1}$ threshold luminos…
Deuterium fractionation in cold dense cores in the low-mass star-forming region L1688
Caselli, P.; Pineda, J. E.; Sipilä, O. +5 more
In this work, we study deuterium fractionation in four starless cores in the low-mass star-forming region L1688 in the Ophiuchus molecular cloud. We study how the deuterium fraction (RD) changes with environment, compare deuteration of ions and neutrals, core centre and its envelope, and attempt to reproduce the observed results with a …
Complex dayside particle precipitation observed during the passage of a solar wind rotational discontinuity
Escoubet, C. Philippe; Wing, Simon; Berchem, Jean +1 more
The dayside particle precipitation during the passage of a solar wind rotational discontinuity (RD) event on 10 April 2015 is examined and reviewed. The RD leads to complex structures at the magnetopause, boundary layer, mantle, and cusp even though the geomagnetic activity level remains low. Particle precipitation data from DMSP F17 reveal the fo…
The nature of very-faint X-ray binaries: near-infrared spectroscopy of 1RXH J173523.7-354013 reveals a giant companion
Maccarone, T. J.; Degenaar, N.; Wijnands, R. +3 more
Very-faint X-ray binaries (VFXBs) are a subclass of black holes and neutron stars in binaries that appear to be accreting at a very low rate. In addition to providing interesting constraints on poorly understood forms of accretion, elucidating the nature of VFXBs is particularly interesting for binary evolution and population modelling. Through ne…
A Multiwavelength Portrait of the 3C 220.3 Lensed System
Azadi, Mojegan; Wilkes, Belinda J.; Worrall, D. M. +10 more
The 3C 220.3 system is a rare case of a foreground narrow-line radio galaxy ("galaxy A," z A = 0.6850) lensing a background submillimeter galaxy (z SMG = 2.221). New spectra from MMT/Binospec confirm that the companion galaxy ("galaxy B") is part of the lensing system with z B = 0.6835. New three-color Hubble S…
G213.0-0.6, a true supernova remnant or just an H II region?
Han, J. L.; Reich, W.; Gao, X. Y. +2 more
G213.0-0.6 is a faint extended source situated in the anticentre region of the Galactic plane. It has been classified as a shell-type supernova remnant (SNR) based on its shell-like morphology, steep radio continuum spectrum, and high ratio of [S II]/Hα. With new optical emission line data of Hα, [S II], and [N II] recently observed by the Large S…
From SMART1 and recent probes towards Artemis and a human/robotic Moon Village
Foing, Bernard
This paper describes highlights of some of the European Space Agency (ESA) missions to the Moon, such as the 2003 ESA SMART-1 Mission to the Moon and the fleet of orbital missions from 2007 that changed our views of the Moon. It discusses the International Lunar Exploration Working Group (ILEWG) MoonVillage roadmap towards a series of landers or a…
Expansion Properties of the Young Supernova Type Iax Remnant Pa 30 Revealed
Kulkarni, S. R.; Raymond, John C.; Caiazzo, Ilaria +14 more
The recently discovered Pa 30 nebula, the putative type Iax supernova remnant associated with the historical supernova of 1181 AD, shows puzzling characteristics that make it unique among known supernova remnants. In particular, Pa 30 exhibits a complex morphology, with a unique radial and filamentary structure, and it hosts a hot stellar remnant …
XRTpy: A Hinode-X-Ray Telescope Python Package
Velasquez, Joy; Murphy, Nicholas; Reeves, Katharine +3 more
Accretion of Meteoric Organic Matter at the Surface of Mars and Potential Production of Methane by Ultraviolet Radiation
Janches, Diego; Villanueva, Gerónimo L.; Carrillo-Sánchez, Juan Diego +1 more
In this study, a comprehensive model of the meteoric organic cycle on Mars for the current geological period is developed, which characterizes the ablation of exogenous organic matter in the upper atmosphere, the accretion of intact carbon at the surface, and the potential production of methane by UV photolysis from the surface reservoir. The mode…