Search Publications
Identification of high-mass X-ray binaries selected from XMM-Newton observations of the LMC★
Haberl, F.; Udalski, A.; McBride, V. A. +5 more
The Large Magellanic Cloud (LMC) currently hosts around 23 high-mass X-ray binaries (HMXBs) of which most are Be/X-ray binaries. The LMC XMM-Newton survey provided follow-up observations of previously known X-ray sources that were likely HMXBs, as well as identifying new HMXB candidates. In total, 19 candidate HMXBs were selected based on their X-…
X-ray spectral variability of blazars using principal component analysis
Gallo, L. C.; Parker, M. L.; Gallant, D.
Principal component analysis (PCA) is applied to a variety of blazars to examine X-ray spectral variability. Data from nine different objects are analysed in two ways: long-term, which examines variability trends across years or decades, and short-term, which looks at variability within a single observation. The results are then compared to simula…
Evidence for halo kinematics among cool carbon-rich dwarfs
Farihi, J.; Arendt, A. R.; Machado, H. S. +1 more
This paper reports preliminary, yet compelling, kinematical inferences for N≳ 600 carbon-rich dwarf stars that demonstrate around 30-60 per cent are members of the Galactic halo. The study uses a spectroscopically and non-kinematically selected sample of stars from the SDSS, and cross-correlates these data with three proper motion catalogues based…
Colour-magnitude diagram in simulations of galaxy formation
Girardi, Léo; Bressan, Alessandro; Borgani, Stefano +3 more
State-of-the-art cosmological hydrodynamical simulations have star particles with a typical mass between ∼108 and ∼103 M⊙ according to resolution, and treat them as simple stellar populations. On the other hand, observations in nearby galaxies resolve individual stars and provide us with single star properties. An …
A window into δ Sct stellar interiors: understanding the eclipsing binary system TT Hor
Murphy, Simon J.; Ireland, Michael J.; Bento, Joao +1 more
The semi-detached eclipsing binary system TT Hor has a δ Sct primary component (accretor) accreting mass from the secondary star (donor). We fit an eclipsing binary model from V, B, and I photometry combined with spectroscopy using PHOEBE. Radial velocity variations of the centre of mass of TT Hor AB over two years suggest the presence of a wide c…
Galaxy-galaxy lensing in the outskirts of CLASH clusters: constraints on local shear and testing mass-luminosity scaling relation
Richard, Johan; Siana, Brian; Desprez, Guillaume +3 more
We present a selection of 24 candidate galaxy-galaxy lensing (GGL) identified from Hubble images in the outskirts of the massive galaxy clusters from the Cluster Lensing And Supernova survey with Hubble (CLASH) . These GGLs provide insights into the mass distributions at larger scales than the strong-lensing region in the cluster cores. We built p…
LLAMA: nuclear stellar properties of Swift-BAT AGN and matched inactive galaxies
Lutz, D.; Genzel, R.; Sturm, E. +20 more
In a complete sample of local 14-195 keV selected active galactic nuclei (AGNs) and inactive galaxies, matched by their host galaxy properties, we study the spatially resolved stellar kinematics and luminosity distributions at near-infrared wavelengths on scales of 10-150 pc, using SINFONI on the VLT. In this paper, we present the first half of th…
Downsizing of star formation measured from the clustered infrared background correlated with quasars
Crichton, Devin; Mandelbaum, Rachel; Zakamska, Nadia L. +2 more
Powerful quasars can be seen out to large distances. As they reside in massive dark matter haloes, they provide a useful tracer of large-scale structure. We stack Herschel-SPIRE images at 250, 350, and 500 µm at the location of 11 235 quasars in 10 redshift bins spanning 0.5 ≤ z ≤ 3.5. The unresolved dust emission of the quasar and its host …
On the multiplicity of ALMA Compact Array counterparts of far-infrared bright quasars
Pérez-Fournon, I.; Wang, L.; Hatziminaoglou, E. +5 more
We present ALMA Atacama Compact Array (ACA) 870 µm continuum maps of 28 infrared-bright SDSS quasars with Herschel/SPIRE detections at redshifts 2-4, the largest such sample ever observed with ALMA. The ACA detections are centred on the SDSS coordinates to within 1 ″ for about 80 per cent of the sample. Larger offsets indicate that the far-i…
Investigating a population of infrared-bright gamma-ray burst host galaxies
Stanway, Elizabeth R.; Davies, Luke J. M.; Chrimes, Ashley A. +3 more
We identify and explore the properties of an infrared-bright gamma-ray burst (GRB) host population. Candidate hosts are selected by coincidence with sources in WISE, with matching to random coordinates and a false alarm probability analysis showing that the contamination fraction is ∼0.5. This methodology has already identified the host galaxy of …