Search Publications
Science from a glimpse: Hubble SNAPshot observations of massive galaxy clusters
Ebeling, H.; Repp, A.
Hubble Space Telescope SNAPshot surveys of 86 X-ray-selected galaxy clusters at 0.3 < z < 0.5 from the MAssive Cluster Survey (MACS) sample have proven invaluable for the exploration of a wide range of astronomical research topics. We here present an overview of the four MACS SNAPshot surveys conducted from Cycle 14 to Cycle 20 as part of a …
The MASSIVE Survey - X. Misalignment between kinematic and photometric axes and intrinsic shapes of massive early-type galaxies
Ma, Chung-Pei; Greene, Jenny E.; Goulding, Andy D. +7 more
We use spatially resolved two-dimensional stellar velocity maps over a 107 × 107 arcsec2 field of view to investigate the kinematic features of 90 early-type galaxies above stellar mass 10^{11.5} M_{⊙ } in the MASSIVE survey. We measure the misalignment angle Ψ between the kinematic and photometric axes and identify local features such …
A deeper look at the GD1 stream: density variations and wiggles
Ferrarese, L.; Belokurov, V.; Koposov, S. E. +4 more
Using deep photometric data from Canada-France-Hawaii Telescope/Megacam, we study the morphology and density of the GD-1 stream, one of the longest and coldest stellar streams in the Milky Way. Our deep data recovers the lower main sequence of the stream with unprecedented quality, clearly separating it from Milky Way foreground and background sta…
Testing the relativistic Doppler boost hypothesis for supermassive black hole binary candidates
Haiman, Zoltán; Schiminovich, David; Charisi, Maria +1 more
Supermassive black hole binaries (SMBHBs) should be common in galactic nuclei as a result of frequent galaxy mergers. Recently, a large sample of sub-parsec SMBHB candidates was identified as bright periodically variable quasars in optical surveys. If the observed periodicity corresponds to the redshifted binary orbital period, the inferred orbita…
The new galaxy evolution paradigm revealed by the Herschel surveys
Ivison, R. J.; Smith, Matthew W. L.; van der Werf, Paul +22 more
The Herschel Space Observatory has revealed a very different galaxyscape from that shown by optical surveys which presents a challenge for galaxy-evolution models. The Herschel surveys reveal (1) that there was rapid galaxy evolution in the very recent past and (2) that galaxies lie on a single Galaxy Sequence (GS) rather than a star-forming 'main…
Internal dynamics of the Large Magellanic Cloud from Gaia DR2
Vasiliev, Eugene
We use the proper motions (PM) of half a million red giant stars in the Large Magellanic Cloud measured by Gaia to construct a 2D kinematic map of mean PM and its dispersion across the galaxy, out to 7 kpc from its centre. We then explore a range of dynamical models and measure the rotation curve, mean azimuthal velocity, velocity dispersion profi…
Galaxy structure from multiple tracers - III. Radial variations in M87's IMF
Auger, Matthew; Oldham, Lindsay
We present the first constraints on stellar mass-to-light ratio gradients in an early-type galaxy (ETG) using multiple dynamical tracer populations to model the dark and luminous mass structure simultaneously. We combine the kinematics of the central starlight, two globular cluster populations and satellite galaxies in a Jeans analysis to obtain n…
The SCUBA-2 Cosmology Legacy Survey: The EGS deep field - II. Morphological transformation and multiwavelength properties of faint submillimetre galaxies
Dunlop, J. S.; Farrah, D.; Michałowski, M. J. +9 more
We present a multiwavelength analysis of galaxies selected at 450 and 850 µm from the deepest SCUBA-2 observations in the Extended Groth Strip (EGS) field, which have an average depth of σ450 = 1.9 and σ850 = 0.46 mJy beam- 1 over ∼70 arcmin2. The final sample comprises 95 sources: 56 (59 per cent)…
The geometric distance and binary orbit of PSR B1259-63
Ransom, S. M.; Tomsick, J. A.; Miller-Jones, J. C. A. +8 more
The pulsar/massive star binary system PSR B1259-63/LS 2883 is one of the best-studied gamma-ray binaries, a class of systems whose bright gamma-ray flaring can provide important insights into high-energy physics. Using the Australian Long Baseline Array, we have conducted very long baseline interferometric observations of PSR B1259-63 over 4.4 yea…
A jet model for the fast IR variability of the black hole X-ray binary GX 339-4
Maccarone, Thomas J.; Malzac, Julien; Petrucci, Pierre-Olivier +18 more
Using the simultaneous Infra-Red (IR) and X-ray light curves obtained by Kalamkar et al., we perform a Fourier analysis of the IR/X-ray timing correlations of the black hole X-ray binary (BHB) GX 339-4. The resulting IR vs X-ray Fourier coherence and lag spectra are similar to those obtained in previous studies of GX 339-4 using optical light curv…