Search Publications
Introducing the Condor array telescope II - deep imaging observations of the edge-on spiral galaxy NGC 5907 and the NGC 5866 Group: yet another view of the iconic stellar stream
Walter, Frederick M.; Shara, Michael M.; Lanzetta, Kenneth M. +6 more
We used the Condor array telescope to obtain deep imaging observations through the luminance filter of the entirety of the NGC 5866 Group, including a very extended region surrounding the galaxy NGC 5907 and its stellar stream. We find that the stellar stream consists of a single curved structure that stretches 220 kpc from a brighter eastern stre…
OGLE-BLAP-009 - a case study for the properties and evolution of blue large-amplitude pulsators
Kupfer, Thomas; van Roestel, Jan; Bildsten, Lars +5 more
Blue large-amplitude pulsators (BLAPs) make up a rare class of hot pulsating stars with effective temperatures of ≈30 000 K and surface gravities of 4.0-5.0 dex (cgs). The evolutionary origin and current status of BLAPs is not well understood, largely based on a lack of spectroscopic observations and no available mass constraints. However, several…
The properties of AGN in dwarf galaxies identified via SED fitting
Smith, D. J. B.; Kaviraj, S.; Watkins, A. E. +5 more
Given their dominance of the galaxy number density, dwarf galaxies are central to our understanding of galaxy formation. While the incidence of active galactic nuclei (AGN) and their impact on galaxy evolution have been extensively studied in massive galaxies, much less is known about the role of AGN in the evolution of dwarfs. We search for radia…
Sub-GeV dark matter annihilation: limits from Milky Way observations with INTEGRAL
Calore, Francesca; Siegert, Thomas; Serpico, Pasquale Dario
From 16 years of INTEGRAL/SPI γ-ray observations, we derive bounds on annihilating light dark matter particles in the halo of the Milky Way up to masses of about 300 MeV. We test four different spatial templates for the dark matter halo, including a Navarro-Frenk-White (NFW), Einasto, Burkert, and isothermal sphere profile, as well as three differ…
Improved constraints on Galactic Centre ejection of hypervelocity stars based on novel search method
Tohill, Clár-Bríd; Kuijken, Konrad; Koposov, Sergey E. +6 more
Hypervelocity stars (HVSs) are stars which have been ejected from the Galactic Centre (GC) at velocities of up to a few thousand
The VLBA CANDELS GOODS-North Survey. II - Wide-field source catalogue comparison between the VLBA, EVN, e-MERLIN, and VLA
Muxlow, T. W. B.; Thomson, A. P.; Garrett, M. A. +5 more
Deep radio surveys of extragalactic legacy fields trace a large range of spatial and brightness temperature sensitivity scales, and therefore have differing biases to radio-emitting physical components within galaxies. This is particularly true of radio surveys performed at $\lesssim 1 \ \mathrm{arcsec}$ angular resolutions, and so robust comparis…
A new method for short-duration transient detection in radio images: searching for transient sources in MeerKAT data of NGC 5068
Wijers, R. A. M. J.; Fender, R.; Woudt, P. A. +12 more
Transient surveys are a vital tool in exploring the dynamic Universe, with radio transients acting as beacons for explosive and highly energetic astrophysical phenomena. However, performing commensal transient surveys using radio imaging can require a significant amount of computing power, data storage, and time. With the instrumentation available…
All-sky three-dimensional dust density and extinction Maps of the Milky Way out to 2.8 kpc
Bailer-Jones, C. A. L.; Fouesneau, M.; Dharmawardena, T. E. +5 more
Three-dimensional dust density maps are crucial for understanding the structure of the interstellar medium of the Milky Way and the processes that shape it. However, constructing these maps requires large data sets and the methods used to analyse them are computationally expensive and difficult to scale up. As a result, it has only recently become…
The accretion history of the Milky Way: III. Hydrodynamical simulations of Galactic dwarf galaxies at first infall
Hammer, Francois; Mamon, Gary A.; Pawlowski, Marcel S. +3 more
Most Milky Way dwarf galaxies are much less bound to their host than are relics of Gaia-Sausage-Enceladus and Sgr. These dwarfs are expected to have fallen into the Galactic halo less than 3 Gyr ago, and will therefore have undergone no more than one full orbit. Here, we have performed hydrodynamical simulations of this process, assuming that thei…
Gaia BH1 and BH2 - evolutionary models with overshooting of the black hole progenitors within the present-day binary separation
Mazeh, T.; Gilkis, A.
Three black holes (BHs) in wide binaries - Gaia BH1, BH2, and BH3 - were recently discovered. The likely progenitors of the BHs were massive stars that experienced a supergiant phase, reaching radii of