Search Publications
No evidence for large-scale outflows in the extended ionized halo of ULIRG Mrk273
Tadhunter, C. N.; Rose, M.; Spoon, H. +4 more
We present deep new Gran Telescopio Canarias (GTC) narrow-band images and William Herschel Telescope (WHT) long-slit spectroscopy of the merging system Mrk273 that show a spectacular extended halo of warm ionized gas out to a radius of ∼45 kpc from the system nucleus. Outside of the immediate nuclear regions (r > 6 kpc), there is no evidence fo…
HELP*: star formation as a function of galaxy environment with Herschel†
Scott, D.; Sargent, M. T.; Buat, V. +15 more
The Herschel Extragalactic Legacy Project (HELP) brings together a vast range of data from many astronomical observatories. Its main focus is on the Herschel data, which maps dust-obscured star formation over 1300 deg2. With this unprecedented combination of data sets, it is possible to investigate how the star formation versus stellar …
Analysis of spatially deconvolved polar faculae
Suematsu, Y.; Shimizu, T.; Ruiz Cobo, B. +2 more
Polar faculae are bright features that can be detected in solar limb observations and they are related to magnetic field concentrations. Although there are a large number of works studying them, some questions about their nature as their magnetic properties at different heights are still open. Thus, we aim to improve the understanding of solar pol…
The first transition Wolf-Rayet WN/C star in M31
Caldwell, Nelson; Iłkiewicz, Krystian; Mikołajewska, Joanna +3 more
Three decades of searches have revealed 154 Wolf-Rayet (WR) stars in M31, with 62 of WC type, 92 of WN type and zero of transition-type WN/C or WC/N. In apparent contrast, about two per cent of the WR stars in the Galaxy, the LMC and M33 simultaneously display strong lines of carbon and nitrogen, I.e. they are transition-type WN/C or WC/N stars. W…
Accretion disc-corona and jet emission from the radio-loud narrow-line Seyfert 1 galaxy RX J1633.3+4719
Misra, R.; Dewangan, G. C.; Gandhi, P. +2 more
We perform X-ray/ultraviolet (UV) spectral and X-ray variability studies of the radio-loud narrow-line Seyfert 1 (NLS1) galaxy RX J1633.3+4719 using XMM-Newton and Suzaku observations from 2011 and 2012. The 0.3-10 keV spectra consist of an ultrasoft component described by an accretion disc blackbody (kT_in = 39.6^{+11.2}_{-5.5} eV) and a power la…
The XMM Cluster Survey: evolution of the velocity dispersion-temperature relation over half a Hubble time
Hilton, Matt; Stott, John P.; Thomas, Peter A. +26 more
We measure the evolution of the velocity dispersion-temperature (σv-TX) relation up to z = 1 using a sample of 38 galaxy clusters drawn from the XMM Cluster Survey. This work improves upon previous studies by the use of a homogeneous cluster sample and in terms of the number of high-redshift clusters included. We present here…
The spatially resolved dynamics of dusty starburst galaxies in a z ∼ 0.4 cluster: beginning the transition from spirals to S0s
Smail, Ian; Swinbank, A. M.; Bower, R. G. +4 more
To investigate what drives the reversal of the morphology-density relation at intermediate/high redshift, we present a multiwavelength analysis of 27 dusty starburst galaxies in the massive cluster Cl 0024+17 at z = 0.4. We combine Hα dynamical maps from the VLT/FLAMES multi-IFU system with far-infrared imaging using Herschel/SPIRE and millimetre …
Gaia transient detection efficiency: hunting for nuclear transients
Harrison, D. L.; Walton, N. A.; Wyrzykowski, Ł. +5 more
We present a study of the detectability of transient events associated with galaxies for the Gaia European Space Agency astrometric mission. We simulated the on-board detections, and on-ground processing for a mock galaxy catalogue to establish the properties required for the discovery of transient events by Gaia, specifically tidal disruption eve…
Reconstruction of small-scale galaxy cluster substructure with lensing flexion
Bradač, Maruša; Cain, Benjamin; Levinson, Rebecca
We present reconstructions of galaxy-cluster-scale mass distributions from simulated gravitational lensing data sets including strong lensing, weak lensing shear, and measurements of quadratic image distortions - flexion. The lensing data is constructed to make a direct comparison between mass reconstructions with and without flexion. We show that…
Improved orbits and parallaxes for eight visual binaries with unrealistic previous masses using the Hipparcos parallax
Docobo, J. A.; Malkov, O. Yu.; Tamazian, V. S. +2 more
Improved orbits are presented for the visual binaries WDS 02366+1227, WDS 02434-6643, WDS 03244-1539, WDS 08507+1800, WDS 09128-6055, WDS 11532-1540, WDS 17375+2419, and WDS 22408-0333. The latest orbits for these binaries were demonstrating a great inconsistency between the systemic mass obtained through Kepler's Third Law and that calculated as …