Search Publications
Outflows and spectral evolution in the eclipsing AMXP SWIFT J1749.4-2807 with NICER, XMM-Newton, and NuSTAR
Altamirano, D.; Albayati, A. C.; Sanna, A. +18 more
The neutron star low-mass X-ray binary SWIFT J1749.4-2807 is the only known eclipsing accreting millisecond X-ray pulsar. In this manuscript, we perform a spectral characterization of the system throughout its 2021, 2-week-long outburst, analysing 11 NICER observations and quasi-simultaneous XMM-Newton and NuSTAR single observations at the outburs…
Gems of the Galaxy Zoos-A Wide-ranging Hubble Space Telescope Gap-filler Program
Scarlata, Claudia; Keel, William C.; Simmons, Brooke D. +13 more
We describe the Gems of the Galaxy Zoos (Zoo Gems) project, a gap-filler project using short windows in the Hubble Space Telescope's schedule. As with previous snapshot programs, targets are taken from a pool based on position; we combine objects selected by volunteers in both the Galaxy Zoo and Radio Galaxy Zoo citizen-science projects. Zoo Gems …
Characterizing the PAH emission in the Orion Bar
Tielens, A. G. G. M.; Peeters, E.; Vacca, W. D. +1 more
We present 5-14 $\mu$m spectra at two different positions across the Orion Bar photodissociation region (PDR) obtained with the Infrared Spectrograph onboard the Spitzer Space Telescope and 3.3 $\mu$m PAH observations obtained with the Stratospheric Observatory for Infrared Astronomy (SOFIA). We aim to characterize emission from Polycyclic Aromati…
Astro-photometric study of M37 with Gaia and wide-field ugi-imaging
Salaris, M.; Anderson, J.; Rosati, P. +15 more
We present an astrometric and photometric wide-field study of the Galactic open star cluster M37 (NGC 2099). The studied field was observed with ground-based images covering a region of about four square degrees in the Sloan-like filters ugi. We exploited the Gaia catalogue to calibrate the geometric distortion of the large field mosaics, developi…
Discovery of eRASSt J192932.9-560346: A bright, two-pole accreting, eclipsing polar
Gromadzki, Mariusz; Buckley, David A. H.; Schwope, Axel +5 more
We report the discovery of a bright (V ~ 15), eclipsing, two-pole accreting magnetic cataclysmic variable (CV), a polar, as counterpart of the SRG/eROSITA and Gaia transients eRASSt J192932.9-560346 and Gaia21bxo. Frequent large-amplitude changes of its brightness at X-ray and optical wavelengths by more than four magnitudes are indicative of a CV…
The GOGREEN survey: constraining the satellite quenching time-scale in massive clusters at z ≳ 1
Cooper, M. C.; Muzzin, Adam; Vulcani, Benedetta +15 more
We model satellite quenching at z ~ 1 by combining 14 massive (1013.8 < Mhalo/M⊙ < 1015) clusters at 0.8 < z < 1.3 from the GOGREEN and GCLASS surveys with accretion histories of 56 redshift-matched analogues from the IllustrisTNG simulation. Our fiducial model, which is parametrized by the s…
Diverse metallicities of Fermi bubble clouds indicate dual origins in the disk and halo
Jenkins, Edward B.; Lockman, Felix J.; Fox, Andrew J. +5 more
The Galactic Centre is surrounded by two giant plasma lobes known as the Fermi bubbles, extending ~10 kpc both above and below the Galactic plane. Spectroscopic observations of Fermi bubble directions at radio, ultraviolet and optical wavelengths have detected multi-phase gas clouds thought to be embedded within the bubbles, referred to as Fermi b…
On the simultaneous modelling of dust and stellar populations for interpretation of galaxy properties
Stanway, Elizabeth R.; Carnall, Adam C.; Jones, Gareth T.
The physical properties of galaxies are encoded within their spectral energy distribution and require comparison with models to be extracted. These models must contain a synthetic stellar population and, where infrared data are to be used, also consider prescriptions for energy reprocessing and re-emission by dust. While many such models have been…
Hubble Space Telescope Imaging Reveals That SN 2015bh Is Much Fainter than Its Progenitor
Smith, Nathan; Strader, Jay; Sand, David J. +5 more
We present Hubble Space Telescope (HST) imaging of the site of SN 2015bh in the nearby spiral galaxy NGC 2770 taken between 2017 and 2019, nearly four years after the peak of the explosion. In 2017-2018, the transient fades steadily in optical filters before declining more slowly to F814W = -7.1 mag in 2019, ≈4 mag below the level of its eruptive …
Variable mass accretion and failed wind explain changing-look phenomena in NGC 1365
Stalin, C. S.; Hryniewicz, K.; Adhikari, T. P. +2 more
Changing-look active galactic nuclei (CLAGNs) show a complex nature in their X-ray spectral shape and line-of-sight column-density variation. The physical mechanisms responsible for these variations are unclear. Here, we study the spectral properties of a CLAGN, NGC 1365 using combined XMM-Newton and NuSTAR observations to understand the CL behavi…