Search Publications
XMM-Newton and INTEGRALanalysis of the Supergiant Fast X-ray Transient IGR J17354-3255
Hill, A. B.; Bird, A. J.; Sguera, V. +2 more
We present the results of combined INTEGRALand XMM-Newton observations of the supergiant fast X-ray transient (SFXT) IGR J17354-3255. Three XMM-Newton observations of lengths 33.4, 32.5, and 21.9 ks were undertaken, the first an initial pointing to identify the correct source in the field of view and the latter two performed around periastron. Sim…
Deep lensing with a twist: E and B modes in a field with multiple lenses
Tyson, J. Anthony; Jee, M. James; Bradshaw, Andrew K.
We explore the weak lensing E- and B-mode shear signals of a field of galaxy clusters using both large-scale structure N-body simulations and multicolour Suprime-cam & Hubble Space Telescope observations. Using the ray-traced and observed shears along with photometric redshift catalogues, we generate mass maps of the foreground overdensities b…
A pre-merger stage galaxy cluster: Abell 3733
Caglar, Turgay; Kaya, H. Ilker; Sert, Hakan
The galaxy cluster Abell 3733 (A3733) is a very suitable candidate in addressing dynamical processes throughout galaxy cluster mergers. This study shows structural analysis results of A3733 (z = 0.038) based on X-ray and optical data. According to X-ray luminosity map, A3733 hosts two sub-structures separated in the sky by 0.25 Mpc, and the two di…
Absolute parameters of young stars: V454 Carinae
Demircan, O.; Özkardeş, B.; Erdem, A. +4 more
We present combined photometric and spectroscopic analyses of the multiple star V454 Carinae. High-resolution spectra of the system were taken at the University of Canterbury Mt. John Observatory during the years 2008-18. These have been processed using generic and purpose-built software. New digital single lens reflex photometry of the system has…
Hierarchical Bayesian approach for estimating physical properties in nearby galaxies: Age Maps (Paper II)
Bland-Hawthorn, Joss; Pérez, Enrique; Cerviño, Miguel +3 more
One of the fundamental goals of modern astrophysics is to estimate the physical parameters of galaxies. We present a hierarchical Bayesian model to compute age maps from images in the H α line (taken with Taurus tunable filter, TTF), ultraviolet band (GALEX far UV, FUV), and infrared bands (Spitzer 24, 70, and 160 µm). We present the burst a…
Local activity of comets: an indicator of non-uniform composition
Kossacki, Konrad J.; Czechowski, L.
In this paper, we investigate the conditions for the local ejection of a metamorphosed surface layer of material from a comet. We have calculated the strengthening of the material of the nucleus of comet 67P/Churyumov-Gerasimenko and the increase of gas pressure in pores. We are interested in the boundary between the regions Anhur and Bes, where a…
Interplay between physics and geometry in Balmer filaments: the case of SN 1006
Raymond, J. C.; Bandiera, R.; Morlino, G. +1 more
The analysis of Balmer-dominated emission in supernova remnants is potentially a very powerful way to derive information on the shock structure, on the physical conditions of the ambient medium and on the cosmic ray acceleration efficiency. However, the outcome of models developed in plane-parallel geometry is usually not easily comparable with th…
Deep late-time observations of the supernova impostors SN 1954J and SN 1961V
Kochanek, C. S.; Adams, S. M.; Patton, Rachel A.
SN 1954J in NGC 2403 and SN 1961V in NGC 1058 were two luminous transients whose definitive classification as either non-terminal eruptions or supernovae remains elusive. A critical question is whether a surviving star can be significantly obscured by dust formed from material ejected during the transient. We use three lines of argument to show th…
The SCUBA-2 Cluster Snapshot Survey - I. Catalogue of lensed galaxies and submillimetre-bright central galaxies
Egami, Eiichi; Geach, James E.; Chapman, Scott C. +6 more
The SCUBA-2 Cluster Snapshot Survey (S2CSS) observed 202 rich clusters of galaxies at 850 µm in relatively poor submillimetre observing conditions (\tau _{{ 225 GHz}}> 0.1) with the aim of identifying rare examples of bright (tens of mJy) gravitationally lensed submillimetre galaxies. The S2CSS covered over 0.33 deg2 to an aver…
DECam survey for low-mass stars and substellar objects in the UCL and LCC subgroups of the Sco-Cen OB Association (SCOCENSUS)
Mamajek, Eric E.; James, David J.; Bell, Cameron P. M. +5 more
Using images taken with the Dark Energy Camera (DECam), the first extensive survey of low mass and substellar objects is made in the ∼15-20 Myr Upper Centaurus Lupus (UCL) and Lower Centaurus Crux (LCC) subgroups of the Scorpius-Centaurus OB Association (Sco-Cen). Due to the size of our data set (>2Tb), we developed an extensive open source set…