Search Publications
Analytical weak-lensing shear responses of galaxy properties and galaxy detection
Mandelbaum, Rachel; Li, Xiangchong
Shear estimation bias from galaxy detection and blending identification is now recognized as an issue for ongoing and future weak-lensing surveys. Currently, the empirical approach to correcting for this bias involves numerically shearing every observed galaxy and rerunning the detection and selection process. In this work, we provide an analytica…
The role of stellar expansion on the formation of gravitational wave sources
Shenar, T.; Belczynski, K.; Romagnolo, A. +3 more
Massive stars are the progenitors of black holes and neutron stars, the mergers of which can be detected with gravitational waves (GW). The expansion of massive stars is one of the key factors affecting their evolution in close binary systems, but it remains subject to large uncertainties in stellar astrophysics. For population studies and predict…
Features of Gaia DR3 spectroscopic binaries I. Tidal circularization of main-sequence stars
Faigler, Simchon; Mazeh, Tsevi; Bashi, Dolev
Previous studies pointed out that many observed samples of short-period binaries display a cut-off period, Pcut, such that almost all binaries with periods shorter than Pcut have circular orbits. This feature is probably due to long-term circularization processes induced by tidal interaction between the two stars of each bina…
Dust attenuation, dust content, and geometry of star-forming galaxies
van Dokkum, Pieter; van der Wel, Arjen; Nelson, Erica J. +11 more
We analyse the joint distribution of dust attenuation and projected axis ratios, together with galaxy size and surface brightness profile information, to infer lessons on the dust content and star/dust geometry within star-forming galaxies at 0 < z < 2.5. To do so, we make use of large observational data sets from KiDS + VIKING + HSC-SSP and…
The accretion history of the Milky Way - I. How it shapes globular clusters and dwarf galaxies
Hammer, Francois; Mamon, Gary A.; Bonifacio, Piercarlo +6 more
Halo inhabitants are individual stars, stellar streams, star, and globular clusters, and dwarf galaxies. Here we compare the two last categories that include objects of similar stellar mass, which are often studied as self-dynamical equilibrium systems. We discover that the half-light radius of globular clusters depends on their orbital pericentre…
Hyper-runaway and hypervelocity white dwarf candidates in Gaia Data Release 3: Possible remnants from Ia/Iax supernova explosions or dynamical encounters
Igoshev, Andrei P.; Hallakoun, Na'ama; Perets, Hagai
Type Ia and other peculiar supernovae (SNe) are thought to originate from the thermonuclear explosions of white dwarfs (WDs). Some of the proposed channels involve the ejection of a partly exploded WD (e.g. Iax SN remnant) or the companion of an exploding WD at extremely high velocities (>400 km s-1). Characterization of such hyper-r…
Photometric and structural parameters of newly discovered nuclear star clusters in Local Volume galaxies
Neumayer, Nadine; Greene, Jenny E.; Seth, Anil C. +2 more
We use high-resolution Hubble Space Telescope imaging data of dwarf galaxies in the Local Volume ($\lesssim {11}\, \mathrm{Mpc}$) to parameterize 19 newly discovered nuclear star clusters (NSCs). Most of the clusters have stellar masses of $M_{\star }^{\mathrm{nsc}} \lesssim 10^{6}{\, {\rm M}_{\odot }}$ and compare to Galactic globular clusters in…
Evidence of extended cold molecular gas and dust haloes around z ∼ 2.3 extremely red quasars with ALMA
Maiolino, R.; Carniani, S.; Scholtz, J. +1 more
Large-scale outflows are believed to be an important mechanism in the evolution of galaxies. We can determine the impact of these outflows by studying either current galaxy outflows and their effect in the galaxy or by studying the effect of past outflows on the gas surrounding the galaxy. In this work, we examine the CO(7-6), [C I] ($^{3} \rm P_{…
JWST's PEARLS: TN J1338-1942 - I. Extreme jet-triggered star formation in a z = 4.11 luminous radio galaxy
Grogin, Norman A.; Holwerda, Benne W.; Hutchison, Taylor A. +25 more
We present the first JWST observations of the z = 4.11 luminous radio galaxy TN J1338-1942, obtained as part of the 'Prime Extragalactic Areas for Reionization and Lensing Science' ('PEARLS') project. Our NIRCam observations, designed to probe the key rest-frame optical continuum and emission line features at this redshift, enable resolved spectra…
CHRONOSTAR - II. Kinematic age and substructure of the Scorpius-Centaurus OB2 association
Žerjal, Maruša; Ireland, Michael J.; Krumholz, Mark R. +2 more
The nearest region of massive star formation - the Scorpius-Centaurus OB2 association (Sco-Cen) - is a local laboratory ideally suited to the study of a wide range of astrophysical phenomena. Precision astrometry from the Gaia mission has expanded the census of this region by an order of magnitude. However, Sco-Cen's vastness and complex substruct…