Search Publications
Cosmological model-independent measurement of cosmic curvature using distance sum rule with the help of gravitational waves
Zhang, Jing-Fei; Zhang, Xin; Wang, Bo +3 more
Although the cosmic curvature has been tightly constrained in the standard cosmological model using observations of cosmic microwave background anisotropies, it is still of great importance to independently measure this key parameter using only late-Universe observations in a cosmological model-independent way. The distance sum rule in strong grav…
The disturbed outer Milky Way disc
Chemin, Laurent; Bland-Hawthorn, Joss; Khanna, Shourya +9 more
The outer parts of the Milky Way's disc are significantly out of equilibrium. Using only distances and proper motions of stars from Gaia's Early Data Release 3, in the range |b| < 10°, 130° < ℓ < 230°, we show that for stars in the disc between around 10 and $14\, \mathrm{kpc}$ from the Galactic centre, vertical velocity is strongly depen…
A panchromatic view of infrared quasars: excess star formation and radio emission in the most heavily obscured systems
Calistro Rivera, Gabriela; Lapi, Andrea; Villforth, Carolin +13 more
To understand the active galactic nuclei (AGNs) phenomenon and their impact on the evolution of galaxies, a complete AGN census is required; however, finding heavily obscured AGNs is observationally challenging. Here we use the deep and extensive multiwavelength data in the COSMOS field to select a complete sample of 578 infrared (IR) quasars ($L_…
The first nova eruption in a novalike variable: YZ Ret as seen in X-rays and γ-rays
Strader, Jay; Chomiuk, Laura; Ness, Jan-Uwe +16 more
Peaking at 3.7 mag on 2020 July 11, YZ Ret was the second-brightest nova of the decade. The nova's moderate proximity (2.7 kpc, from Gaia) provided an opportunity to explore its multiwavelength properties in great detail. Here, we report on YZ Ret as part of a long-term project to identify the physical mechanisms responsible for high-energy emissi…
The impact of two massive early accretion events in a Milky Way-like galaxy: repercussions for the buildup of the stellar disc and halo
Springel, Volker; Orkney, Matthew D. A.; Laporte, Chervin F. P. +6 more
We identify and characterize a Milky Way-like realization from the Auriga simulations with two consecutive massive mergers $\sim 2$ Gyr apart at high redshift, comparable to the reported Kraken and Gaia-Sausage-Enceladus. The Kraken-like merger (z = 1.6, $M_{\rm Tot}=8\times 10^{10}\, \rm {M_{\odot }}$) is gas-rich, deposits most of its mass in th…
Gaia spectroscopic orbits validated with LAMOST and GALAH radial velocities
Mazeh, T.; Faigler, S.; Jorissen, A. +5 more
The recently published Gaia DR3 catalogue of $181\, 327$ spectroscopic binaries (SB) includes the Keplerian elements of each orbit but not the measured radial velocities (RVs) and their epochs. Instead, the catalogue lists a few parameters that characterize the robustness of each solution. In this work, we use two external sources to validate the …
Limits on the mass and initial entropy of 51 Eri b from Gaia EDR3 astrometry
Dupuy, Trent J.; Brandt, Timothy D.; Brandt, G. Mirek
51 Eri b is one of the only young planets consistent with a wide range of possible initial entropy states, including the cold-start scenario associated with some models of planet formation by core accretion. The most direct way to constrain the initial entropy of a planet is by measuring its luminosity and mass at a sufficiently young age that the…
Bright, relatively isolated star clusters in PHANGS-HST galaxies: Aperture corrections, quantitative morphologies, and comparison with synthetic stellar population models
Kruijssen, J. M. Diederik; Rosolowsky, Erik; Glover, Simon C. O. +14 more
Using PHANGS-HST NUV-U-B-V-I imaging of 17 nearby spiral galaxies, we study samples of star clusters and stellar associations, visually selected to be bright and relatively isolated, for three purposes: to compute aperture corrections for star cluster photometry, to explore the utility of quantitative morphologies in the analysis of clusters and a…
The evolution of ultra-massive carbon-oxygen white dwarfs
Córsico, Alejandro H.; Althaus, Leandro G.; Torres, Santiago +3 more
Ultra-massive white dwarfs ($\rm \mathit{M}_{WD} \gtrsim 1.05\, {\rm M}_{\odot }$) are considered powerful tools to study Type Ia supernovae explosions, merger events, the occurrence of physical processes in the superasymptotic giant branch phase, and the existence of high magnetic fields. Traditionally, ultra-massive white dwarfs are expected to …
The UV 2175Å attenuation bump and its correlation with PAH emission at z 2
Brinchmann, Jarle; Nanayakkara, Themiya; Shivaei, Irene +10 more
The UV bump is a broad absorption feature centred at 2175 Å that is seen in the attenuation/extinction curve of some galaxies, but its origin is not well known. Here, we use a sample of 86 star-forming galaxies at z = 1.7-2.7 with deep rest-frame UV spectroscopy from the MUSE HUDF Survey to study the connection between the strength of the observed…