Search Publications
A transient, flat spectrum radio pulsar near the Galactic Centre
Degenaar, N.; Kerr, M.; Kramer, M. +6 more
Recent studies have shown possible connections between highly magnetized neutron stars ('magnetars'), whose X-ray emission is too bright to be powered by rotational energy, and ordinary radio pulsars. In addition to the magnetar SGR J1745-2900, one of the radio pulsars in the Galactic Centre (GC) region, PSR J1746-2850, had timing properties imply…
The Circumgalactic Medium of Submillimeter Galaxies. II. Unobscured QSOs within Dusty Starbursts and QSO Sightlines with Impact Parameters below 100 kpc
Casey, Caitlin M.; Prochaska, J. Xavier; Scoville, Nick +4 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) 870 µm observations of 29 bright Herschel sources near high-redshift QSOs. The observations confirm that 20 of the Herschel sources are submillimeter-bright galaxies (SMGs) and identify 16 new SMG-QSO pairs that are useful to studies of the circumgalactic medium (CGM) of SMGs. Ei…
A multi-observatory database of X-ray pulsars in the Magellanic Clouds
Zezas, A.; Antoniou, V.; Coe, M. J. +5 more
Using hundreds of XMM-Newton and Chandra archival observations and nearly a thousand RXTE observations, we have generated a comprehensive library of the known pulsars in the Small and Large Magellanic Clouds (SMC and LMC). The pulsars are detected multiple times across the full parameter spaces of X-ray luminosity (LX = 1031 - 38
Performance of an Algorithm for Estimation of Flux, Background, and Location on One-dimensional Signals
Busonero, D.; Cancelliere, R.; Gai, M.
Optimal estimation of signal amplitude, background level, and photocenter location is crucial to the combined extraction of astrometric and photometric information from focal plane images, in particular from the one-dimensional measurements performed by Gaia on intermediate to faint magnitude stars. Our goal is to define a convenient maximum likel…
An XMM-Newton Study of the Mixed-morphology Supernova Remnant G346.6-0.2
Auchettl, Katie; Slane, Patrick; Ng, C. -Y. +2 more
We present an X-ray imaging and spectroscopic study of the molecular cloud interacting mixed-morphology supernova remnant G346.6-0.2 using XMM-Newton. The X-ray spectrum of the remnant is well described by a recombining plasma that most likely arises from adiabatic cooling and has subsolar abundances of Mg, Si, and S. Our fits also suggest the pre…
Optical Properties of Non-stoichiometric Amorphous Silicates with Application to Circumstellar Dust Extinction
Tamanai, Akemi; Pucci, Annemarie; Dohmen, Ralf +1 more
We determine the optical constants of non-stoichiometric amorphous magnesium-iron silicates and demonstrate that they can well reproduce the observed mid-infrared emission spectra of evolved stars. Stoichiometric and non-stoichiometric amorphous magnesium-iron silicate films are fabricated by pulsed laser deposition. Transmittance and ellipsometry…
Characteristics of ionospheric flux rope at the terminator observed by Venus Express
Zhang, T. L.; Chen, Y. Q.; Wang, G. Q. +1 more
We investigate the characteristics of the magnetic flux rope in the Venusian ionosphere near the terminator observed by the Venus Express while previous works about flux rope by PVO are mainly in the subsolar region. The probability to observe the flux rope becomes larger as solar activity strengthens. A statistical work during solar maximum prese…
Widespread exposure of Noachian phyllosilicates in the Margaritifer region of Mars: Implications for paleohydrology and astrobiological detection
Hynek, Brian M.; Thomas, Rebecca J.; Osterloo, Mikki M. +1 more
The best locations at which to detect evidence for early life on Mars are in materials formed in near-surface aqueous environments, particularly where this resulted in the deposition of minerals such as clays that are favorable to preservation of organics. The geological history of the Margaritifer region has resulted in exceptional potential to p…
Variable quiescent state for the neutron-star X-ray transient SAX J1750.8-2900: not such a hot neutron star after all?
Wijnands, R.; Parikh, A. S.
We monitored the neutron star low-mass X-ray binary SAX J1750.8-2900 after the end of its 2015/2016 outburst using the X-ray Telescope (XRT) aboard Swift to detect possible post-outburst 'rebrightenings', similar to those seen after its 2008 outburst. We did not detect any rebrightening behaviour, suggesting that the physical mechanism behind the …
Investigation of the Geoeffectiveness of Disk-Centre Full-Halo Coronal Mass Ejections
Valtonen, Eino; Ameri, Dheyaa
We studied the occurrence and characteristics of geomagnetic storms associated with disk-centre full-halo coronal mass ejections (DC-FH-CMEs). Such coronal mass ejections (CMEs) can be considered as the most plausible cause of geomagnetic storms. We selected front-side full-halo coronal mass ejections detected by the Large Angle and Spectrometric …