Search Publications
MeerKAT observations of starburst galaxies and AGNs within the core of XMMXCS J2215.9-1738 at z = 1.46
Smail, I.; Heywood, I.; Swinbank, A. M. +4 more
We present the first detailed radio study of the galaxy cluster XMMXCS J2215.9-1738 at z = 1.46 using MeerKAT L-band (1.3 GHz) observations. We combine our radio observation with archival optical and infrared data to investigate the star formation and active galactic nucleus (AGN) population within $R_{200}$ ($R =$ 0.8 Mpc) of the cluster centre. …
3D physical structure and angular expansion of the remnant of the recurrent nova T Pyx
Guerrero, M. A.; Toalá, J. A.; Santamaría, E. +2 more
We present the analysis of archival Very Large Telescope (VLT) Multi-Unit Spectroscopic Explorer (MUSE) and multi-epoch Hubble Space Telescope (HST) Wide Field Planetary Camera 2 (WFPC2) and Wide Field Camera 3/Ultraviolet-Visible Imaging Spectrograph (WFC3/UVIS) narrow-band observations of the remnant associated with the ejecta of the mid-ninetee…
X-ray variability of SDSS quasars based on the SRG/eROSITA all-sky survey
Bikmaev, I. F.; Gilfanov, M. R.; Medvedev, P. S. +6 more
We examine the long-term (rest-frame time-scales from a few months to ~20 yr) X-ray variability of a sample of 2344 X-ray bright quasars from the Sloan Digital Sky Survey (SDSS) data release 14 quasar (DR14Q) catalogue, based on the data of the Spectrum-Roentgen-Gamma (SRG)/eROSITA All-Sky Survey complemented for ~7 per cent of the sample by archi…
DUVET: Resolved direct metallicity measurements in the outflow of starburst galaxy NGC 1569
Cameron, Alex J.; Kacprzak, Glenn G.; Chisholm, John +15 more
We present the results of direct-method metallicity measurements in the disc and outflow of the low-metallicity starburst galaxy NGC 1569. We use Keck Cosmic Web Imager observations to map the galaxy across 54″ (800 pc) along the major axis and 48″ (700 pc) along the minor axis with a spatial resolution of 1″ (~15 pc). We detect common strong emis…
Little evolution of dust emissivity in bright infrared galaxies from 2 < z < 6
Ivison, R. J.; Arumugam, V.; Eales, S. A. +1 more
Variations in the dust emissivity index, $\beta$, within and between galaxies, are evidence that the chemistry and physics of dust must vary on large scales, although the nature of the physical and/or chemical variations is still unknown. In this paper, we estimate values of $\beta$ and dust temperature for a sample of 109 dusty star-forming galax…
Revisiting the effect of lens mass models in cosmological applications of strong gravitational lensing
Harvey-Hawes, Christopher; Wiltshire, David L.
Strong gravitational lens system catalogues are typically used to constrain a combination of cosmological and empirical power-law lens mass model parameters, often introducing additional empirical parameters and constraints from high resolution imagery. We investigate these lens models using Bayesian methods through a novel alternative that treats…
Viewing the PLATO LOPS2 field through the lenses of TESS
Bayliss, Daniel; Pelisoli, Ingrid; Kunimoto, Michelle +3 more
PLATO will begin observing stars in its Southern Field (LOPS2) after its launch in late 2026. By this time, TESS will have observed the stars in LOPS2 for at least four years. We find that by 2025, on average each star in the PLATO field will have been monitored for 330 d by TESS, with a subset of stars in the TESS continuous viewing zone having o…
Long-term X-ray temporal and spectral study of a Seyfert galaxy Mrk 6
Naik, Sachindra; Jana, Arghajit; Kumari, Neeraj +3 more
We present a long-term X-ray study of a nearby Active Galactic Nucleus Mrk 6, utilizing observations from XMM-Newton, Suzaku, Swift, and NuSTAR observatories, spanning 22 years from 2001 to 2022. From timing analysis, we estimated variance, normalized variance, and fractional rms amplitude in different energy bands.The temporal study shows fractio…
Globular clusters and bar: captured or not captured?
Smirnov, Anton A.; Bobylev, Vadim V.; Bajkova, Anisa T.
Studies of the dynamics of globular clusters assume different values of bar parameters (mass, velocity, and size) and analyse the results of orbit classifications over the range of the chosen values. It is also a usual thing that a spherical bulge component is converted into the bar to obtain a non-axisymmetric potential from an axisymmetric one. …
A two-minute burst of highly polarized radio emission originating from low Galactic latitude
Qiu, Hao; Shannon, Ryan M.; Auchettl, Katie +19 more
Several sources of repeating coherent bursts of radio emission with periods of many minutes have now been reported in the literature. These 'ultralong period' (ULP) sources have no clear multiwavelength counterparts and challenge canonical pulsar emission models, leading to debate regarding their nature. In this work, we report the discovery of a …