Search Publications
V902 Monocerotis: A likely disc-accreting intermediate polar
Mukai, K.; Schwope, A. D.; Traulsen, I. +2 more
Aims: We aim to confirm whether the eclipsing cataclysmic variable (CV) V902 Mon is an intermediate polar (IP), to characterise its X-ray spectrum and flux, and to refine its orbital ephemeris and spin period.
Methods: We performed spectrographic observations of V902 Mon in 2016 with the 2.2 m Calar Alto telescope, and X-ray photometry a…
A Search for H I Lyα Counterparts to Ultrafast X-Ray Outflows
Kriss, Gerard A.; Lee, Julia C.; Danehkar, Ashkbiz
Prompted by the H I Lyα absorption associated with the X-ray ultrafast outflow at -17,300 km s-1 in the quasar PG 1211+143, we have searched archival UV spectra at the expected locations of H I Lyα absorption for a large sample of ultrafast outflows identified in XMM-Newton and Suzaku observations. Sixteen of the X-ray outflows have pre…
Hot star extension to the Hubble Space Telescope stellar spectral library
Worthey, Guy; Khan, Islam
Context. Libraries of stellar spectra find many uses in astrophysics, from photometric calibration to stellar population synthesis.
Aims: We present low resolution spectra of 40 stars from 0.2 µm (ultraviolet) to 1.0 µm (near infrared) with excellent fluxing. The stars include normal O-type stars, helium-burning stars, and post-as…
Determination of astrophysical parameters of quasars within the Gaia mission
Delchambre, L.
We describe methods designed to determine the astrophysical parameters of quasars based on spectra coming from the red and blue spectrophotometers of the Gaia satellite. These methods principally rely on two already published algorithms that are the weighted principal component analysis and the weighted phase correlation. The presented approach be…
Does the Compact Radio Jet in PG 1700+518 Drive a Molecular Outflow?
Rupke, David S. N.; Gültekin, Kayhan; Runnoe, Jessie C.
Radio jets play an important role in quasar feedback, but direct observations showing how the jets interact with the multi-phase interstellar medium of galaxy disks are few and far between. In this work, we provide new millimeter interferometric observations of PG 1700+518 in order to investigate the effect of its radio jet on the surrounding mole…
Galaxy Ellipticity Measurements in the Near-infrared for Weak Lensing
Wright, Edward L.; Chary, Ranga-Ram; Lee, Bomee
We investigate the value of the near-infrared imaging from upcoming surveys for constraining the ellipticities of galaxies. We select galaxies between 0.5 ≤ z < 3 that are brighter than expected Euclid sensitivity limits from the GOODS-S and N fields in CANDELS. The co-added CANDELS/HST V+I and J+H images are degraded in resolution and sensitiv…
Optical Identification of X-ray Sources from the 14-Year INTEGRAL All-Sky Survey
Medvedev, P. S.; Lutovinov, A. A.; Eselevich, M. V. +6 more
We present the results of our optical identifications of several hard X-ray sources from the INTEGRAL all-sky survey obtained over 14 years of observations. Having improved the positions of these objects in the sky with the X-ray telescope (XRT) of the Swift observatory and the XMMNewton observatory, we have identified their counterparts using opt…
Cassini CAPS Identification of Pickup Ion Compositions at Rhea
Coates, A. J.; Thomsen, M. F.; Jones, G. H. +9 more
Saturn's largest icy moon, Rhea, hosts a tenuous surface-sputtered exosphere composed primarily of molecular oxygen and carbon dioxide. In this Letter, we examine Cassini Plasma Spectrometer velocity space distributions near Rhea and confirm that Cassini detected nongyrotropic fluxes of outflowing CO2+ during both the R1 and R1.5 encounters. Accou…
Understanding Fomalhaut as a Cooper pair
Jones, H. R. A.; Feng, F.
Fomalhaut is a nearby stellar system and has been found to be a triple based on astrometric observations. With new radial velocity and astrometric data, we study the association between Fomalhaut A, B, and C in a Bayesian framework, finding that the system is gravitationally bound or at least associated. Based on simulations of the system, we find…
Inner Source C+/O+ Pickup Ions Produced by Solar Wind Recycling, Neutralization, Backscattering, Sputtering, and Sputtering-induced Recycling
Möbius, E.; Schwadron, N. A.; Berger, L. +2 more
Inner source pickup ions (PUIs) are believed to be created by the interaction between the solar wind and interplanetary dust grains. The production mechanism, however, is not well understood. We use the Stopping Range of Ions in Matter and Energetic Particle Radiation Environment Module to simulate the production and transport of inner source C