Search Publications
HST/COS Observations of Quasar Outflows in the 500-1050 Å Rest Frame. II. The Most Energetic Quasar Outflow Measured to Date
Xu, Xinfeng; Kriss, Gerard A.; Arav, Nahum +2 more
We present a study of the BAL outflows seen in quasar SDSS J1042+1646 (z = 0.978) in the rest-frame 500-1050 Å (EUV500) region. The results are based on the analysis of recent Hubble Space Telescope/Cosmic Origins Spectrograph observations. Five outflow systems are identified, where, in total, they include ∼70 outflow troughs from ionic transition…
Disc-binary interactions in depleted post-AGB binaries
Van Winckel, Hans; Nelemans, Gijs; Pols, Onno +1 more
Binary post-asymptotic giant branch (post-AGB) stars have orbital periods in the range of 100-2500 days in eccentric orbits. They are surrounded by circumbinary dusty discs. They are the immediate result of unconstrained binary interaction processes. Their observed orbital properties do not correspond to model predictions: Neither the periods nor …
hybrid-LENSTOOL: a self-consistent algorithm to model galaxy clusters with strong- and weak-lensing simultaneously
Richard, Johan; Kneib, Jean-Paul; Sharon, Keren +5 more
We present a new galaxy cluster lens modelling approach, hybrid-LENSTOOL, that is implemented in the publicly available modelling software LENSTOOL. hybrid-LENSTOOL combines a parametric approach to model the core of the cluster, and a non-parametric (free-form) approach to model the outskirts. hybrid-LENSTOOL optimizes both strong- and weak-lensi…
The case for strangulation in low-mass hosts: DDO 113
Kochanek, Christopher S.; Sand, David J.; Peter, Annika H. G. +2 more
We investigate the case for environmental quenching of the Fornax-mass satellite DDO 113, which lies only 9 kpc in projection from its host, the Large-Magellanic-Cloud-mass galaxy NGC 4214. DDO 113 was quenched about 1 Gyr ago and is virtually gas-free, while analogs in the field are predominantly star-forming and gas-rich. We use deep imaging obt…
Spectroscopic Orbits of 11 Nearby, Mid-to-late M-dwarf Binaries
Latham, David W.; Berlind, Perry; Calkins, Michael L. +7 more
We present the spectroscopic orbits of 11 nearby, mid-to-late M dwarf binary systems in a variety of configurations: 2 single-lined binaries (SB1s), 7 double-lined binaries (SB2s), 1 double-lined triple (ST2), and 1 triple-lined triple (ST3). Eight of these orbits are the first published for these systems, while five are newly identified multiples…
A new method for measuring the meteor mass index: application to the 2018 Draconid meteor shower outburst
Vida, D.; Campbell-Brown, M.; Brown, P. G. +2 more
Context. Several authors predicted an outburst of the Draconid meteor shower in 2018, but with an uncertain level of activity.
Aims: Optical meteor observations were used to derive the population and mass indices, flux, and radiant positions of Draconid meteors.
Methods: We performed 90 min of multi-station observations after the predict…
A Census of Star Formation in the Outer Galaxy. II. The GLIMPSE360 Field
Hora, Joseph L.; Tolls, Volker; Winston, Elaine
We have conducted a study of star formation in the outer Galaxy from 65°< l < 265° in the region observed by the GLIMPSE360 program. This Spitzer warm mission program mapped the plane of the outer Milky Way with IRAC at 3.6 and 4.5 µm. We combine the IRAC, Wide-field Infrared Survey Explorer (WISE), and Two Micron All Sky Survey catalo…
Far-ultraviolet aurora identified at comet 67P/Churyumov-Gerasimenko
Altwegg, K.; Feldman, P. D.; Carr, C. +14 more
Having a nucleus darker than charcoal, comets are usually detected from Earth through the emissions from their coma. The coma is an envelope of gas that forms through the sublimation of ices from the nucleus as the comet gets closer to the Sun. In the far-ultraviolet portion of the spectrum, observations of comae have revealed the presence of atom…
The Deflection of Coronal Mass Ejections by the Ambient Coronal Magnetic Field Configuration
Liu, Siqing; Wang, Jingjing; Hoeksema, J. Todd
Solar coronal mass ejections (CMEs) are sometimes deflected during their propagation. This deflection may be the consequence of an interaction between the CME and the ambient coronal field, for example, a coronal hole, or the solar wind. The coronal magnetic field configuration is computed from daily synoptic maps of magnetic field from SOHO/MDI a…
Unveiling pure-metal ejecta X-ray emission in supernova remnants through their radiative recombination continuum
Greco, Emanuele; Vink, Jacco; Miceli, Marco +5 more
Context. Spectral analysis of X-ray emission from ejecta in supernova remnants (SNRs) is hampered by the low spectral resolution of CCD detectors, which typically creates a degeneracy between the best-fit values of chemical abundances and the plasma emission measure. The combined contribution of shocked ambient medium and ejecta to the emerging X-…