Search Publications
Re-observing the NLS1 galaxy RE J1034+396 - II. New insights on the soft X-ray excess, QPO, and the analogy with GRS 1915+105
Done, Chris; Ward, Martin; Jin, Chichuan
The active galactic nucleus (AGN) RE J1034+396 displays the most significant X-ray quasi-periodic oscillation (QPO) detected so far. We perform a detailed spectral-timing analysis of our recent simultaneous XMM-Newton, NuSTAR, and Swift observations. We present the energy dependence of the QPO's frequency, rms, coherence, and phase lag, and model …
Revisiting the Cygnus OB associations
Quintana, Alexis L.; Wright, Nicholas J.
OB associations play an important role in Galactic evolution, though their origins and dynamics remain poorly studied, with only a small number of systems analysed in detail. In this paper, we revisit the existence and membership of the Cygnus OB associations. We find that of the historical OB associations only Cyg OB2 and OB3 stand out as real gr…
On the compressive nature of turbulence driven by ionizing feedback in the pillars of the Carina Nebula
Federrath, Christoph; Reiter, Megan; Klaassen, Pamela +2 more
The ionizing radiation of massive stars sculpts the surrounding neutral gas into pillar-like structures. Direct signatures of star formation through outflows and jets are observed in these structures, typically at their tips. Recent numerical simulations have suggested that this star formation could potentially be triggered by photoionizing radiat…
Evolution of the galaxy stellar mass function: evidence for an increasing M* from z = 2 to the present day
Häußler, B.; Bowler, R. A. A.; Jarvis, M. J. +2 more
Utilizing optical and near-infrared broad-band photometry covering >5 deg2 in two of the most well-studied extragalactic legacy fields (COSMOS and XMM-LSS), we measure the galaxy stellar mass function (GSMF) between 0.1 < z < 2.0. We explore in detail the effect of two source extraction methods (SExtractor and ProFound) in addi…
Magnetic white dwarfs in post-common-envelope binaries
Gänsicke, B. T.; Breedt, E.; Marsh, T. R. +5 more
Magnitude-limited samples have shown that 20-25 per cent of cataclysmic variables contain white dwarfs with magnetic fields of Mega Gauss strength, in stark contrast to the approximately 5 per cent of single white dwarfs with similar magnetic field strengths. Moreover, the lack of identifiable progenitor systems for magnetic cataclysmic variables …
The ASKAP-EMU Early Science Project: 888 MHz radio continuum survey of the Large Magellanic Cloud
Maitra, Chandreyee; Koribalski, Bärbel S.; Norris, Ray P. +28 more
We present an analysis of a new 120 deg2 radio continuum image of the Large Magellanic Cloud (LMC) at 888 MHz with a bandwidth of 288 MHz and beam size of 13${_{.}^{\prime\prime}}$9 × 12${_{.}^{\prime\prime}}$1 from the Australian Square Kilometre Array Pathfinder processed as part of the Evolutionary Map of the Universe survey. The med…
A Planck-selected dusty proto-cluster at z = 2.16 associated with a strong overdensity of massive Hα-emitting galaxies
Koyama, Yusei; Kodama, Tadayuki; Tanaka, Ichi +6 more
We have discovered an overdensity of Hα-emitting galaxies associated with a Planck compact source in the COSMOS field (PHz G237.0+42.5) through narrow-band imaging observations with the Subaru Multi-Object InfraRed Camera and Spectrograph (MOIRCS). This Planck-selected dusty proto-cluster at z = 2.16 has 38 Hα emitters including six spectroscopica…
Unveiling the star formation history of the Upper Scorpius association through its kinematics
Gratton, Raffaele; Bonavita, Mariangela; Squicciarini, Vito +1 more
Stellar associations can be discerned as overdensities of sources not only in the physical space but also in the velocity space. The common motion of their members, gradually eroded by the galactic tidal field, is partially reminiscent of the initial kinematic structure. Using recent data from Gaia EDR3, combined with radial velocities from GALAH …
The intracluster magnetic field in the double relic galaxy cluster Abell 2345
Lovisari, L.; Vazza, F.; van Weeren, R. J. +5 more
Magnetic fields are ubiquitous in galaxy clusters, yet their radial profile, power spectrum, and connection to host cluster properties are poorly known. Merging galaxy clusters hosting diffuse polarized emission in the form of radio relics offer a unique possibility to study the magnetic fields in these complex systems. In this paper, we investiga…
White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 16
Kepler, S. O.; Pelisoli, Ingrid; Romero, Alejandra D. +2 more
White dwarfs are the end state of the evolution of more than 97 per cent of all stars, and therefore carry information on the structure and evolution of the Galaxy through their luminosity function and initial-to-final mass relation. Examining the new spectra of all white or blue stars in the Sloan Digital Sky Survey Data Release 16, we report the…