Search Publications
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 …
BAHAMAS: New Analysis of Type Ia Supernovae Reveals Inconsistencies with Standard Cosmology
van Dyk, David A.; Shariff, Hikmatali; Jiao, Xiyun +1 more
We present results obtained by applying our BAyesian HierArchical Modeling for the Analysis of Supernova cosmology (BAHAMAS) software package to the 740 spectroscopically confirmed supernovae of type Ia (SNe Ia) from the “Joint Light-curve Analysis” (JLA) data set. We simultaneously determine cosmological parameters and standardization parameters,…
An Iron K Component to the Ultrafast Outflow in NGC 1313 X-1
Harrison, F. A.; Stern, D.; Fabian, A. C. +8 more
We present the detection of an absorption feature at E={8.77}-0.06+0.05 keV in the combined X-ray spectrum of the ultraluminous X-ray source NGC 1313 X-1 observed with XMM-Newton and NuSTAR, significant at the 3σ level. If associated with blueshifted ionized iron, the implied outflow velocity is ∼0.2c for Fe xxvi, or ∼0.25c f…
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…
The MOSDEF Survey: Dynamical and Baryonic Masses and Kinematic Structures of Star-forming Galaxies at 1.4 ≤ z ≤ 2.6
Barro, Guillermo; Siana, Brian; Shapley, Alice E. +11 more
We present {{H}}α gas kinematics for 178 star-forming galaxies at z∼ 2 from the MOSFIRE Deep Evolution Field survey. We have developed models to interpret the kinematic measurements from fixed-angle multi-object spectroscopy, using structural parameters derived from Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey Hubble Space Telesc…
Sequence and relative timing of large lakes in Gale crater (Mars) after the formation of Mount Sharp
Mangold, Nicolas; Williams, Rebecca M. E.; Palucis, Marisa C. +6 more
The quantification of lake levels in Gale crater is important to define the hydrologic and climatic history experienced by the sedimentary deposits found by Curiosity. We propose that there were at least three major lake stands within Gale, each persisted >1000 years, and all occurred after Mount Sharp reached close to its current topographic f…
Gaia Data Release 1. The Cepheid and RR Lyrae star pipeline and its application to the south ecliptic pole region
Szabados, L.; Rimoldini, L.; Holl, B. +24 more
Context. The European Space Agency spacecraft Gaia is expected to observe about 10 000 Galactic Cepheids and over 100 000 Milky Way RR Lyrae stars (a large fraction of which will be new discoveries), during the five-year nominal lifetime spent scanning the whole sky to a faint limit of G = 20.7 mag, sampling their light variation on average about …
The First Circumbinary Planet Found by Microlensing: OGLE-2007-BLG-349L(AB)c
Bennett, D. P.; Gal-Yam, A.; Ofek, E. +84 more
We present the analysis of the first circumbinary planet microlensing event, OGLE-2007-BLG-349. This event has a strong planetary signal that is best fit with a mass ratio of q ≈ 3.4 × 10-4, but there is an additional signal due to an additional lens mass, either another planet or another star. We find acceptable light-curve fits with t…
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…