Search Publications
Is this an early stage merger? A case study on molecular gas and star formation properties of Arp 240
Wilson, C. D.; Iono, Daisuke; Saito, Toshiki +2 more
We present new high-resolution 12CO J = 1-0, J = 2-1, and 13CO J = 1-0 maps of the early stage merger Arp 240 (NGC 5257/8) obtained with the Atacama Large Millimeter/submillimeter Array (ALMA). Simulations in the literature suggest that the merger has just completed its first passage; however, we find that this system has a l…
Broad-band spectral analysis of LMXB XTE J1710-281 with Suzaku
Jain, Chetana; Dutta, Anjan; Sharma, Rahul +1 more
This work presents the broad-band time-averaged spectral analysis of neutron star (NS) low-mass X-ray binary, XTE J1710-281 by using the Suzaku archival data. The source was in a hard or an intermediate spectral state during this observation. This is the first time that a detailed spectral analysis of the persistent emission spectra of XTE J1710-2…
A kinematically unbiased, all-sky search for nearby, young, low-mass stars
Murphy, Simon J.; Kastner, Joel H.; Principe, David A. +6 more
The past two decades have seen dramatic progress in our knowledge of the population of young stars of age < 200 Myr that lie within 150 pc of the Sun. These nearby, young stars, most of which are found in loose, comoving groups, provide the opportunity to explore (among many other things) the dissolution of stellar clusters and their diffusion …
Polycyclic aromatic hydrocarbon excitation in nearby spiral galaxies
Bendo, G. J.; Lu, N.; Zijlstra, A.
We have examined polycyclic aromatic hydrocarbon (PAH) excitation in a sample of 25 nearby face-on spiral galaxies using the ratio of mid-infrared PAH emission to dust mass. Within 11 of the galaxies, we found that the PAH excitation was straightforwardly linked to ultraviolet (UV) or mid-infrared star formation tracers, which, along with other re…
The first Doppler imaging of the active binary prototype RS Canum Venaticorum
Schmitt, J. H. M. M.; Wolter, U.; Collier Cameron, A. +6 more
We present the first Doppler images of the prototypical active binary star RS Canum Venaticorum, derived from high-resolution spectra observed in 2004, 2016 and 2017, using three different telescopes and observing sites. We apply the least-squares deconvolution technique to all observed spectra to obtain high signal-to-noise line profiles, which a…
Discovery of a near-infrared bar and a pseudo-bulge in the collisional ring galaxy Cartwheel
Mayya, Y. D.; Barway, Sudhanshu; Robleto-Orús, Aitor
We report the discovery of a bar, a pseudo-bulge, and unresolved point source in the archetype collisional ring galaxy Cartwheel using careful morphological analysis of a near-infrared (NIR) Ks-band image of excellent quality (seeing = 0.42″) at the ESO archive. The bar is oval-shaped with a semi-major axis length of 3.23
SCUBA-2 overdensities associated with candidate protoclusters selected from Planck data
Andreani, P.; Valtchanov, I.; Clements, D. L. +21 more
We measure the 850-µm source densities of 46 candidate protoclusters selected from the Planck high-z catalogue (PHz) and the Planck Catalogue of Compact Sources (PCCS) that were followed up with Herschel-SPIRE and SCUBA-2. This paper aims to search for overdensities of 850-µm sources in order to select the fields that are most likely t…
Exploiting morphological data from Pulsar Wind Nebulae via a spatiotemporal leptonic transport code
Venter, C.; Seyffert, A. S.; van Rensburg, C. +1 more
The next era of ground-based Cherenkov telescope development will see a great increase in both quantity and quality of γ-ray morphological data. This initiated the development of a spatiotemporal leptonic transport code to model pulsar wind nebulae. We present results from this code that predicts the evolution of the leptonic particle spectrum and…
Resilient habitability of nearby exoplanet systems
Mustill, Alexander J.; Davies, Melvyn B.; Kokaia, Giorgi
We investigate the possibility of finding Earth-like planets in the habitable zone of 34 nearby FGK-dwarfs, each known to host one giant planet exterior to their habitable zone detected by RV. First we simulate the dynamics of the planetary systems in their present day configurations and determine the fraction of stable planetary orbits within the…
TESS photometry of extreme helium stars PV Tel and V821 Cen
Barentsen, Geert; Handler, Gerald; Jeffery, C. Simon
PV Tel variables are extreme helium (EHe) stars known to be intrinsic light and velocity variable on characteristic time-scales of 0.1-25 d. With two exceptions, they are best described as irregular. Light curves have invariably been obtained from single-site terrestrial observatories. We present Transiting Exoplanet Survey Satellite observations …