Search Publications
On the coexistence of stellar-mass and intermediate-mass black holes in globular clusters
Lützgendorf, Nora; Heinke, Craig; Maccarone, Thomas J. +3 more
In this paper, we address the question: what is the probability of stellar-mass black hole (BH) binaries co-existing in a globular cluster with an intermediate-mass black hole (IMBH)? Our results suggest that the detection of one or more BH binaries can strongly constrain the presence of an IMBH in most Galactic globular clusters. More specificall…
Depleted cores, multicomponent fits, and structural parameter relations for luminous early-type galaxies
Graham, Alister W.; Dullo, Bililign T.
New surface brightness profiles from 26 early-type galaxies with suspected partially depleted cores have been extracted from the full radial extent of Hubble Space Telescope images. We have carefully quantified the radial stellar distributions of the elliptical galaxies using the core-Sérsic model whereas for the lenticular galaxies a core-Sérsic …
A giant radio halo in the cool core cluster CL1821+643.
Sommer, M.; Fabian, A. C.; Cassano, R. +8 more
Giant radio haloes are Mpc-size sources found in some merging galaxy clusters. The synchrotron emitting electrons are thought to be (re)accelerated by plasma turbulence induced by the merging of two massive clusters. Cool core galaxy clusters have a low-temperature core, likely an indication that a major merger has not recently occurred. CL1821+64…
CO(1-0) survey of high-z radio galaxies: alignment of molecular halo gas with distant radio sources
Ivison, R. J.; Pentericci, L.; Greve, T. R. +19 more
We present a CO(1-0) survey for cold molecular gas in a representative sample of 13 high-z radio galaxies (HzRGs) at 1.4 < z < 2.8, using the Australia Telescope Compact Array. We detect CO(1-0) emission associated with five sources: MRC 0114-211, MRC 0152-209, MRC 0156-252, MRC 1138-262 and MRC 2048-272. The CO(1-0) luminosities are in the …
The SAMI Pilot Survey: the kinematic morphology-density relation in Abell 85, Abell 168 and Abell 2399
Bland-Hawthorn, Joss; Konstantopoulos, Iraklis S.; Brough, S. +17 more
We examine the kinematic morphology of early-type galaxies (ETGs) in three galaxy clusters Abell 85, 168 and 2399. Using data from the Sydney-AAO Multi-object Integral field spectrograph we measure spatially resolved kinematics for 79 ETGs in these clusters. We calculate λR, a proxy for the projected specific stellar angular momentum, f…
GRB 130925A: an ultralong gamma ray burst with a dust-echo afterglow, and implications for the origin of the ultralong GRBs
Lien, A.; Sánchez-Ramírez, R.; Götz, D. +24 more
GRB 130925A was an unusual gamma ray burst (GRB), consisting of three distinct episodes of high-energy emission spanning ∼20 ks, making it a member of the proposed category of `ultralong' bursts. It was also unusual in that its late-time X-ray emission observed by Swift was very soft, and showed a strong hard-to-soft spectral evolution with time. …
Herschel *-ATLAS: deep HST/WFC3 imaging of strongly lensed submillimetre galaxies
Ivison, R. J.; Omont, A.; Sutherland, W. +35 more
We report on deep near-infrared observations obtained with the Wide Field Camera-3 (WFC3) onboard the Hubble Space Telescope (HST) of the first five confirmed gravitational lensing events discovered by the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). We succeed in disentangling the background galaxy from the lens to gain separate …
GRB 140206A: the most distant polarized gamma-ray burst
Covino, S.; D'Avanzo, P.; Melandri, A. +4 more
The nature of the prompt gamma-ray emission of gamma-ray bursts (GRBs) is still far from being completely elucidated. The measure of linear polarization is a powerful tool that can be used to put further constraints on the content and magnetization of the GRB relativistic outflows, as well as on the radiation processes at work. To date, only a han…
The formation of stellar nuclear discs in bar-induced gas inflows
Debattista, Victor P.; Erwin, Peter; Earp, Samuel W. F. +2 more
The role of gas in the mass assembly at the nuclei of galaxies is still subject to some uncertainty. Stellar nuclear discs bridge the gap between the large-scale galaxy and the central massive objects that reside there. Using a high-resolution simulation of a galaxy forming out of gas cooling and settling into a disc, we study the formation and pr…
Reproducing properties of MW dSphs as descendants of DM-free TDGs
Kroupa, Pavel; Hammer, François; Puech, Mathieu +4 more
The Milky Way (MW) dwarf spheroidal (dSph) satellites are known to be the most dark-matter (DM) dominated galaxies with estimates of dark-to-baryonic matter reaching even above 100. It comes from the assumption that dwarfs are dynamically supported by their observed velocity dispersions. However, their spatial distributions around the MW are not a…