Search Publications
Deep Extragalactic VIsible Legacy Survey: Data Release 1 blended spectra search for candidate strong gravitational lenses
Holwerda, B. W.; Davies, L. J. M.; Siudek, M. +3 more
Here, we present a catalogue of blended spectra in Data Release 1 of the Deep Extragalactic VIsible Legacy Survey (DEVILS) on the Anglo-Australian Telescope. Of the 23 197 spectra, 181 showed signs of a blend of redshifts and spectral templates. We examine these blends in detail for signs of either a candidate strong lensing galaxy or a useful ove…
Plateaus, dips, and rebrightenings during the outbursts of WZ Sge: no magnetic propeller, but a veiling curtain
Knigge, C.; Castro Segura, N.; Long, K. S. +1 more
WZ Sge is the prototype of highly evolved, low-accretion rate dwarf novae (DNe). During the decline from eruptions, its light curve displays a 'dip' followed by ≃10 'echo outbursts'. The standard disc instability model does not account for this behaviour, which is also seen in other low-accretion rate DNe. One recent interpretation for these rapid…
Probing cool giants in unresolved galaxies using fluctuation eigenspectra: A demonstration using high-resolution MUSE observations of NGC 5128
Smith, Russell J.
I describe and demonstrate a new approach to using spectroscopic data to exploit Poisson sampling fluctuations in unresolved stellar populations. The method is introduced using spectra predicted for independent samples of stars from a 10 Gyr population using a simple stochastic spectral synthesis model. A principal components analysis shows that &…
The MAVERIC Survey: The first radio and X-ray limits on the detached black holes in NGC 3201
Kamann, Sebastian; Dreizler, Stefan; Strader, Jay +11 more
The Galactic globular cluster (GC) NGC 3201 is the first Galactic GC observed to host dynamically confirmed stellar-mass black holes (BHs), containing two confirmed and one candidate BH. This result indicates that GCs can retain BHs, which has important implications for GC evolution. NGC 3201 has been observed as part of the MAVERIC survey of Gala…
A Suzaku sample of unabsorbed narrow-line and broad-line Seyfert 1 galaxies - II. Iron emission and absorption
Gallo, L. C.; Waddell, S. G. H.
A sample of 22 narrow-line type 1 Seyfert (NLS1) and 47 broad-line type 1 Seyfert (BLS1) galaxies observed with Suzaku is used to examine the Fe K-band properties of each group. Three different models are used to examine the presence of: narrow neutral Fe K α line at $6.4{\rm \, keV}$ and ionized Fe XXV and Fe XXVI emission lines (model A); a broa…
Detailed evolutionary models for twins in sight of new spectral data: AN Cam, RS Ari, and V455 Aur
Bakış, Volkan; Yücel, Gökhan
We present the evolutionary scenarios for three eclipsing twin (q(M2/M1) ~1) binary systems using their combined spectroscopic and photometric data. Using accurate TESS photometric data, RV measurements, and spectroscopic data enabled us to calculate fundamental parameters, such as mass and radius, better than 2 per cent. The…
Using machine learning to identify extragalactic globular cluster candidates from ground-based photometric surveys of M87
Clarkson, William I.; Kundu, Arunav; Dage, Kristen C. +6 more
Globular clusters (GCs) have been at the heart of many longstanding questions in many sub-fields of astronomy and, as such, systematic identification of GCs in external galaxies has immense impacts. In this study, we take advantage of M87's well-studied GC system to implement supervised machine learning (ML) classification algorithms - specificall…
PIPS, an advanced platform for period detection in time series - I. Fourier-likelihood periodogram and application to RR Lyrae stars
Filippenko, Alexei V.; Stahl, Benjamin E.; Savel, Arjun B. +7 more
We describe the Period detection and Identification Pipeline Suite (PIPS) - a new, fast, and statistically robust platform for period detection and analysis of astrophysical time-series data. PIPS is an open-source Python package that provides various pre-implemented methods and a customizable framework for automated, robust period measurements wi…
Massive stars dying alone: the remote environment of supernova 2010jp and its associated late-time source
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Corgan, Austin +2 more
We present late-time images of the site of the peculiar jet-driven Type IIn supernova (SN) 2010jp, including Hubble Space Telescope images taken 2-5 yr post-explosion and deep ground-based images over a similar time. These are used to characterize its unusually remote environment and to constrain the progenitor's initial mass and age. The position…
PyNAPLE: Lunar Surface Impact Crater Detection
Delbo, M.; Avdellidou, C.; Sefton-Nash, E. +4 more
In the last 20 yr, over 600 impact flashes have been documented on the lunar surface. This wealth of data presents a unique opportunity to study the meteoroid flux of the Earth-Moon environment, and in recent years the physical properties of the impactors. However, other than through serendipitous events, there has not been yet a systematic search…