Search Publications
Hubble Frontier Fields: predictions for the return of SN Refsdal with the MUSE and GMOS spectrographs
Kneib, J. -P.; Smith, G. P.; Egami, E. +13 more
We present a high-precision mass model of the galaxy cluster MACS J1149.6+ 2223, based on a strong gravitational lensing analysis of Hubble Space Telescope Frontier Fields (HFF) imaging data and spectroscopic follow-up with Gemini/Gemini Multi-Object Spectrographs (GMOS) and Very Large Telescope (VLT)/Multi Unit Spectroscopic Explorer (MUSE). Our …
Massive star mergers and the recent transient in NGC 4490: a more massive cousin of V838 Mon and V1309 Sco
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Smith, Nathan +11 more
The Galactic transient V1309 Sco was the result of a merger in a low-mass star system, while V838 Mon was thought to be a similar merger event from a more massive B-type progenitor. In this paper, we study a recent optical and infrared (IR) transient discovered in the nearby galaxy NGC 4490 named NGC 4490-OT2011 (NGC 4490-OT hereafter), which appe…
Evolution of CO2, CH4, and OCS abundances relative to H2O in the coma of comet 67P around perihelion from Rosetta/VIRTIS-H observations
Kührt, E.; Encrenaz, T.; Erard, S. +19 more
Infrared observations of the coma of 67P/Churyumov-Gerasimenko were carried out from 2015 July to September, I.e. around perihelion (2015 August 13), with the high-resolution channel of the Visible and Infrared Thermal Imaging Spectrometer instrument onboard Rosetta. We present the analysis of fluorescence emission lines of H2O, CO…
Ionospheric plasma of comet 67P probed by Rosetta at 3 au from the Sun
Wurz, P.; Altwegg, K.; Glassmeier, K. -H. +23 more
We propose to identify the main sources of ionization of the plasma in the coma of comet 67P/Churyumov-Gerasimenko at different locations in the coma and to quantify their relative importance, for the first time, for close cometocentric distances (<20 km) and large heliocentric distances (>3 au). The ionospheric model proposed is used as an …
The SAMI Galaxy Survey: extraplanar gas, galactic winds and their association with star formation history
Kewley, Lisa J.; Kobayashi, Chiaki; Bland-Hawthorn, Joss +23 more
We investigate a sample of 40 local, main-sequence, edge-on disc galaxies using integral field spectroscopy with the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey to understand the link between properties of the extraplanar gas and their host galaxies. The kinematics properties of the extraplanar gas, including velocity …
Structure and evolution of the diamagnetic cavity at comet 67P/Churyumov-Gerasimenko
Nilsson, H.; Eriksson, A.; Sierks, H. +13 more
The long duration of the Rosetta mission allows us to study the evolution of the diamagnetic cavity at comet 67P/Churyumov-Gerasimenko in detail. From 2015 April to 2016 February 665 intervals could be identified where Rosetta was located in a zero-magnetic-field region. We study the temporal and spatial distribution of this cavity and its boundar…
ALMA observations of cold molecular gas filaments trailing rising radio bubbles in PKS 0745-191
O'Connell, R. W.; Fabian, A. C.; Combes, F. +16 more
We present ALMA observations of the CO(1-0) and CO(3-2) line emission tracing filaments of cold molecular gas in the central galaxy of the cluster PKS 0745-191. The total molecular gas mass of 4.6± 0.3× 109 M_{⊙}, assuming a Galactic XCO factor, is divided roughly equally between three filaments each extending radially 3-5 kp…
Modelling supernova line profile asymmetries to determine ejecta dust masses: SN 1987A from days 714 to 3604
Barlow, M. J.; Bevan, Antonia
The late-time optical and near-IR line profiles of many core-collapse supernovae exhibit a red-blue asymmetry as a result of greater extinction by internal dust of radiation emitted from the receding parts of the supernova ejecta. We present here a new code, DAMOCLES, that models the effects of dust on the line profiles of core-collapse supernovae…
Dead or Alive? Long-term evolution of SN 2015bh (SNhunt275)
Brown, P. J.; Smartt, S. J.; Kotak, R. +37 more
Supernova (SN) 2015bh (or SNhunt275) was discovered in NGC 2770 on 2015 February with an absolute magnitude of Mr ∼ -13.4 mag, and was initially classified as an SN impostor. Here, we present the photometric and spectroscopic evolution of SN 2015bh from discovery to late phases (∼1 yr after). In addition, we inspect archival images of t…
A self-consistent model for the evolution of the gas produced in the debris disc of β Pictoris
Pringle, J. E.; Kral, Q.; Juhász, A. +3 more
This paper presents a self-consistent model for the evolution of gas produced in the debris disc of β Pictoris. Our model proposes that atomic carbon and oxygen are created from the photodissociation of CO, which is itself released from volatile-rich bodies in the debris disc due to grain-grain collisions or photodesorption. While the CO lasts les…