Search Publications
Modelling uncertainties in wide binary constraints on primordial black holes
Goodwin, Simon P.; Green, Anne M.; Tyler, Emily
Dark matter in the form of compact objects with mass Mco ≳ 10 M⊙ can be constrained by its dynamical effects on wide binary stars. Motivated by the recent interest in primordial black hole dark matter, we revisit the theoretical modelling involved in these constraints. We improve on previous studies in several ways. Specifica…
Another X-ray UFO without a momentum-boosted molecular outflow. ALMA CO(1-0) observations of the galaxy pair IRAS 05054+1718
Vignali, Cristian; Reeves, James N.; Dotti, Massimo +8 more
We present Atacama Large Millimetre/submillimetre Array (ALMA) CO(1-0) observations of the nearby infrared luminous (LIRG) galaxy pair IRAS 05054+1718 (also known as CGCG 468-002), as well as a new analysis of X-ray data of this source collected between 2012 and 2021 using the Nuclear Spectroscopic Telescope Array (NuSTAR), Swift, and the XMM-Newt…
Two substellar survivor candidates: one found and one missing
Hermes, J. J.; von Hippel, T.; Breedt, E. +4 more
This study presents observations of two possible substellar survivors of post-main sequence engulfment, currently orbiting white dwarf stars. Infrared and optical spectroscopy of GD 1400 reveals a 9.98 h orbital period, where the benchmark brown dwarf has M2 = 68 ± 8 MJup, Teff ≈ 2100 K, and a cooling age under 1 G…
Tracking magnetic flux and helicity from the Sun to Earth. Multi-spacecraft analysis of a magnetic cloud and its solar source
Temmer, M.; Veronig, A. M.; Dumbović, M. +5 more
Aims: We analyze the complete chain of effects - from the Sun to Earth - caused by a solar eruptive event in order to better understand the dynamic evolution of magnetic-field-related quantities in interplanetary space, in particular that of magnetic flux and helicity.
Methods: We study a series of connected events - a confined C4.5 flar…
The Influence of the Bar on the Dynamics of Globular Clusters in the Central Region of the Milky Way. Frequency Analysis of Orbits According to Gaia EDR3 Data
Bobylev, V. V.; Bajkova, A. T.; Smirnov, A. A.
This work is devoted to studying the influence of the bar on the orbital dynamics of globular clusters. The orbits of 45 globular clusters in the central galactic region with a radius of 3.5 kpc were analyzed using spectral dynamics methods in order to identify objects captured by the bar. To form the 6D phase space required for orbit integration,…
Discovery and physical characterization as the first response to a potential asteroid collision: The case of 2023 DZ2
Licandro, J.; Alarcon, M. R.; Hudin, L. +15 more
Context. Near-Earth asteroids (NEAs) that may evolve into impactors deserve detailed threat assessment studies. Early physical characterization of a would-be impactor may help in optimizing impact mitigation plans. We first detected NEA 2023 DZ2 on 27 February 2023. After that, it was found to have a minimum orbit intersection distance …
The SkyMapper search for extremely metal-poor stars in the Large Magellanic Cloud
Da Costa, G. S.; Mackey, A. D.; Nordlander, T. +2 more
We present results of a search for extremely metal-poor stars in the Large Magellanic Cloud (LMC), which can provide crucial information about the properties of the first stars as well as on the formation conditions prevalent during the earliest stages of star formation in dwarf galaxies. Our search utilized SkyMapper photometry, together with par…
Resolved Kennicutt-Schmidt law in two strongly lensed star-forming galaxies at redshift 1
Richard, Johan; Sun, Jiayi; Combes, Françoise +4 more
We study the star formation rate (SFR) vs. molecular gas mass (Mmol) scaling relation from hundreds to thousands of parsec in two strongly lensed galaxies at redshift z ∼ 1, the Cosmic Snake and A521. We trace the SFR using extinction-corrected rest-frame UV observations with the Hubble Space Telescope (HST), and Mmol using d…
Galaxy populations in the most distant SPT-SZ clusters. II. Galaxy structural properties in massive clusters at 1.4 ≲ z ≲ 1.7
Bayliss, M. B.; Sharon, K.; Pannella, M. +12 more
We investigate structural properties of massive galaxy populations in the central regions (< 0.7 r500) of five very massive (M200 > 4 × 1014 M⊙), high-redshift (1.4 ≲ z ≲ 1.7) galaxy clusters from the 2500 deg2 South Pole Telescope Sunyaev Zel'dovich effect (SPT-SZ) survey. We probe the …
A Herschel study of the high-mass protostar IRAS 20126+4104
Testi, L.; Molinari, S.; Lorenzani, A. +3 more
We performed Herschel observations of the continuum and line emission from the high-mass star-forming region IRAS 20126+4104, which hosts a well-studied B-type (proto)star powering a bipolar outflow and is associated with a Keplerian circumstellar disk. The continuum images at six wavelengths allowed us to derive an accurate estimate of the bolome…