Search Publications
PHANGS: constraining star formation time-scales using the spatial correlations of star clusters and giant molecular clouds
Kruijssen, J. M. Diederik; Leroy, Adam K.; Rosolowsky, Erik +22 more
In the hierarchical view of star formation, giant molecular clouds (GMCs) undergo fragmentation to form small-scale structures made up of stars and star clusters. Here we study the connection between young star clusters and cold gas across a range of extragalactic environments by combining the high resolution (1″) PHANGS-ALMA catalogue of GMCs wit…
PASSAGES: the Large Millimeter Telescope and ALMA observations of extremely luminous high-redshift galaxies identified by the Planck
Frye, B. L.; Terlevich, E.; Terlevich, R. +20 more
The Planck All-Sky Survey to Analyze Gravitationally-lensed Extreme Starbursts project aims to identify a population of extremely luminous galaxies using the Planck all-sky survey and to explore the nature of their gas fuelling, induced starburst, and the resulting feedback that shape their evolution. Here, we report the identification of 22 high-…
SDSS-IV MaStar: theoretical atmospheric parameters for the MaNGA stellar library
Merrifield, Michael; Bizyaev, Dmitry; Law, David R. +16 more
We calculate the fundamental stellar parameters effective temperature, surface gravity, and iron abundance - Teff, log g, [Fe/H] - for the final release of the Mapping Nearby Galaxies at APO (MaNGA) Stellar Library (MaStar), containing 59 266 per-visit-spectra for 24 290 unique stars at intermediate resolution (R ~ 1800) and high S/N (m…
Weak gravitational lensing shear measurement with FPFS: analytical mitigation of noise bias and selection bias
Massey, Richard; Li, Xiangchong; Li, Yin
Dedicated 'Stage IV' observatories will soon observe the entire extragalactic sky, to measure the 'cosmic shear' distortion of galaxy shapes by weak gravitational lensing. To measure the apparent shapes of those galaxies, we present an improved version of the Fourier Power Function Shapelets (FPFS) shear measurement method. This now includes analy…
The merging galaxy cluster Abell 3266 at low radio frequencies
Bartalucci, I.; Riseley, C. J.; Johnston-Hollitt, M. +2 more
We present new low-frequency (ν = 88-216 MHz) observations of the complex merging galaxy cluster Abell 3266. These new observations are taken with the Murchison Widefield Array (MWA) in its Phase II 'extended', long-baseline configuration, offering the highest resolution low-frequency view of the cluster to date. We report on the detection of four…
Orion Bar as a window to the evolution of PAHs
Kirsanova, Maria S.; Boley, Paul A.; Murga, Maria S. +1 more
We investigate the mid-infrared (IR) emission in the Orion Bar photodissociation region (PDR), using archival photometric and spectroscopic observations from the United Kingdom Infrared Telescope (UKIRT), Spitzer, Infrared Space Observatory(ISO), and Stratospheric Observatory for Infrared Astronomy (SOFIA) telescopes. Specifically, we consider flu…
Probing the physicochemical properties of the Leo Ring and the Leo I group
Richter, Philipp; Charlton, Jane C.; Kacprzak, Glenn G. +6 more
We present an absorption line study of the physical and chemical properties of the Leo H I Ring and the Leo I Group as traced by 11 quasar sightlines spread over a ≈600 × 800 kpc2 region. Using HST/COS G130/G160 archival observations as constraints, we couple cloud-by-cloud, multiphase, Bayesian ionization modelling with galaxy property…
The magnetic field and magnetosphere of Plaskett's star: a fundamental shift in our understanding of the system
Wade, G. A.; Neiner, C.; Alecian, E. +7 more
Plaskett's 'star' appears to be one of a small number of short-period binary systems known to contain a hot, massive, magnetic star. We combine an extensive spectropolarimetric (Stokes V) data set with archival photometry and spectropolarimetry to establish the essential characteristics of the magnetic field and magnetosphere of the rapidly rotati…
X-ray timing and spectral variability properties of blazars S5 0716 + 714, OJ 287, Mrk 501, and RBS 2070
Mohorian, Maksym; Bhatta, Gopal; Adhikari, Tek P. +6 more
The X-ray emission from blazars has been widely investigated using several space telescopes. In this work, we explored statistical properties of the X-ray variability in the blazars S5 0716+714, OJ 287, Mkn 501, and RBS 2070 using the archival observations from the XMM-Newton telescope between the period 2002-2020. Several methods of timing and sp…
Timing and spectral analysis of 2S 1417-624 during its 2018 outburst
Serim, M. M.; Şahiner, Ş.; Baykal, A. +4 more
We investigate timing and spectral characteristics of the transient X-ray pulsar 2S 1417-624 during its 2018 outburst with NICER follow up observations. We describe the spectra with high-energy cut-off and partial covering fraction absorption (PCFA) model and present flux-dependent spectral changes of the source during the 2018 outburst. Utilizing…