Search Publications
The DEHVILS survey overview and initial data release: high-quality near-infrared Type Ia supernova light curves at low redshift
Jones, David O.; Riess, Adam G.; Shappee, Benjamin J. +17 more
While the sample of optical Type Ia supernova (SN Ia) light curves (LCs) usable for cosmological parameter measurements surpasses 2000, the sample of published, cosmologically viable near-infrared (NIR) SN Ia LCs, which have been shown to be good 'standard candles,' is still ≲ 200. Here, we present high-quality NIR LCs for 83 SNe Ia ranging from 0…
Combing the brown dwarf desert with Gaia DR3
Barstow, Joanna K.; Stevenson, Adam T.; Haswell, Carole A. +1 more
We have created an up-to-date catalogue of 214 brown dwarfs (BDs) in binaries with P < 104 d. This allows us to examine the population statistics of the BD desert. We searched Gaia third data release (DR3) non-single star (NSS) results for orbital inclinations of BD candidates, deriving 12 new masses. Three remain as desert BDs where…
GAMA/DEVILS: cosmic star formation and AGN activity over 12.5 billion years
Holwerda, Benne; Bland-Hawthorn, Joss; D'Silva, Jordan C. J. +11 more
We use the Galaxy and Mass Assembly (GAMA) and the Deep Extragalactic Visible Legacy Survey (DEVILS) observational data sets to calculate the cosmic star formation rate (SFR) and active galactic nuclei (AGN) bolometric luminosity history (CSFH/CAGNH) over the last 12.5 billion years. SFRs and AGN bolometric luminosities were derived using the spec…
MUSE-ALMA Haloes - VIII. Statistical study of circumgalactic medium gas
Hayes, M.; Kacprzak, G. G.; Kuntschner, H. +15 more
The distribution of gas and metals in the circumgalactic medium (CGM) plays a critical role in how galaxies evolve. The MUSE-ALMA Haloes survey combines MUSE, ALMA, and HST observations to constrain the properties of the multiphase gas in the CGM and the galaxies associated with the gas probed in absorption. In this paper, we analyse the propertie…
Constraints on the Galactic centre environment from Gaia hypervelocity stars III: insights on a possible companion to Sgr A*
Rossi, E. M.; Castro-Ginard, A.; Marchetti, T. +4 more
We consider a scenario in which Sgr A* is in a massive black hole binary (MBHB) with an as-of-yet undetected supermassive or intermediate-mass black hole companion. Dynamical encounters between this MBHB and single stars in its immediate vicinity would eject hypervelocity stars (HVSs) with velocities beyond the Galactic escape velocity of the Gala…
Source counts at 7.7-21 µm in CEERS field with JWST
Kilerci, Ece; Hashimoto, Tetsuya; Goto, Tomotsugu +8 more
Source counts - the number density of sources as a function of flux density - represent one of the fundamental metrics in observational cosmology due to their straightforward and simple nature. It is an important tool that provides information on galaxy formation and evolution. Source counting is a direct measurement. Compared to advanced analyses…
WD J004917.14-252556.81: the most massive pulsating white dwarf
Córsico, Alejandro H.; Althaus, Leandro G.; Kilic, Mukremin +3 more
We present Apache Point Observatory (APO) and Gemini time-series photometry of WD J004917.14-252556.81, an ultramassive DA white dwarf with $T_{\rm eff} = 13\, 020$ K and log g = 9.34. We detect variability at two significant frequencies, making J0049-2525 the most massive pulsating white dwarf currently known with M⋆ = 1.31 M⊙
The stellar population responsible for a kiloparsec-size superbubble seen in the JWST 'phantom' images of NGC 628
Luna, A.; Gómez-González, V. M. A.; Mayya, Y. D. +11 more
We here study the multiband properties of a kiloparsec-size superbubble in the late-type spiral galaxy NGC 628. The superbubble is the largest of many holes seen in the early release images using James Webb Space Telescope (JWST)/MIRI filters that trace the polycyclic aromatic hydrocarbon (PAH) emissions. The superbubble is located in the interarm…
Data-driven selection and spectral classification of white dwarf stars
Bergeron, P.; Dufour, P.; Vincent, Olivier
The next generation of spectroscopic surveys is expected to provide spectra for hundreds of thousands of white dwarf (WD) candidates in the upcoming years. Currently, spectroscopic classification of white dwarfs is mostly done by visual inspection, requiring substantial amounts of expert attention. We propose a data-driven pipeline for fast, autom…
Dust-scattering rings of GRB 221009A as seen by the Neil Gehrels Swift X-ray Observatory: can we count them all?
Vasilopoulos, Georgios; Karavola, Despina; Stathopoulos, Stamatios I. +1 more
We present the first results for the dust-scattering rings of GRB 221009A, coined as the gamma-ray bursts (GRBs) of the century, as observed by the Neil Gehrels Swift Observatory. We perform analysis of both time resolved observations and stacked data. The former approach enable us to study the expansion of the most prominent rings, associate thei…