Search Publications
Constraining cosmology with the Gaia-unWISE Quasar Catalog and CMB lensing: structure growth
Hogg, David W.; Rix, Hans-Walter; Eilers, Anna-Christina +4 more
We study the angular clustering of Quaia, a Gaia- and unWISE-based catalog of over a million quasars with an exceptionally well-defined selection function. With it, we derive cosmology constraints from the amplitude and growth of structure across cosmic time. We divide the sample into two redshift bins, centered at z = 1.0 and z = 2.1, and measure…
Molecular gas cloud properties at z ≃ 1 revealed by the superb angular resolution achieved with ALMA and gravitational lensing
Richard, Johan; Schaerer, Daniel; Egami, Eiichi +6 more
Current observations favour that the massive ultraviolet-bright clumps with a median stellar mass of $\sim 10^7\, {\rm M}_{\odot }$, ubiquitously observed in z ~ 1-3 galaxies, are star-forming regions formed in situ in galaxies. It has been proposed that they result from gas fragmentation due to gravitational instability of gas-rich, turbulent, an…
Corrected SFD: A More Accurate Galactic Dust Map with Minimal Extragalactic Contamination
Chiang, Yi-Kuan
The widely used Milky Way dust-reddening map, the Schlegel-Finkbeiner-Davis (SFD) map, was found to contain extragalactic large-scale structure (LSS) imprints. Such contamination is inherent in maps based on infrared emission, which pick up not only Galactic dust but also the cosmic infrared background (CIB). When SFD is used for extinction correc…
VINTERGATAN-GM: The cosmological imprints of early mergers on Milky-Way-mass galaxies
Feuillet, Diane K.; Martin, Nicolas F.; Pontzen, Andrew +6 more
We present a new suite of cosmological zoom-in hydrodynamical ($\approx 20\, \mathrm{pc}$ spatial resolution) simulations of Milky-Way mass galaxies to study how a varying mass ratio for a Gaia-Sausage-Enceladus (GSE) progenitor impacts the z = 0 chemodynamics of halo stars. Using the genetic modification approach, we create five cosmological hist…
JWST: Deuterated PAHs, PAH Nitriles, and PAH Overtone and Combination Bands. I. Program Description and First Look
Boersma, C.; Bregman, J. D.; Allamandola, L. J. +6 more
A first look is taken at the NIRSpec 1-5 µm observations from James Webb Space Telescope program 1591 that targets seven objects along the low-mass stellar life cycle with polycyclic aromatic hydrocarbon (PAH) emission. Spectra extracted from a 1.″5 radius circular aperture are explored, showing a wealth of features, including the 3 µm…
Peering into the young planetary system AB Pic. Atmosphere, orbit, obliquity, and second planetary candidate
Ginski, C.; Homeier, D.; Zhang, Y. +24 more
Aims: We aim to revisit the formation pathway of AB Pic b, an imaged companion that straddles the exoplanet/brown-dwarf boundary. We based this study on a rich set of observations, which allows us to investigate its orbital and atmospheric properties.
Methods: We composed a spectrum of AB Pic b by merging archival medium-resolution (~400…
CEERS: MIRI deciphers the spatial distribution of dust-obscured star formation in galaxies at 0.1 < z < 2.5
Papovich, Casey; Yang, Guang; Finkelstein, Steven L. +23 more
Aims: We study the stellar (i.e., rest-optical) and dust-obscured star-forming (i.e., rest-mid-infrared) morphologies (i.e., sizes and Sérsic indices) of star-forming galaxies (SFGs) at 0.1 < z < 2.5.
Methods: We combined Hubble Space Telescope (HST) images from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CA…
The Planck clusters in the LOFAR sky. VI. LoTSS-DR2: Properties of radio relics
Simionescu, A.; Zhang, X.; Di Gennaro, G. +19 more
Context. It is well established that shock waves in the intracluster medium launched by galaxy cluster mergers can produce synchrotron emission, which is visible to us at radio frequencies as radio relics. However, the particle acceleration mechanism producing these relics is still not fully understood. It is also unclear how relics relate to radi…
TDCOSMO. X. Automated modeling of nine strongly lensed quasars and comparison between lens-modeling software
Treu, T.; Sluse, D.; Suyu, S. H. +5 more
When strong gravitational lenses are to be used as an astrophysical or cosmological probe, models of their mass distributions are often needed. We present a new, time-efficient automation code for the uniform modeling of strongly lensed quasars with GLEE, a lens-modeling software for multiband data. By using the observed positions of the lensed qu…
A partially stripped massive star in a Be binary at low metallicity. A missing link towards Be X-ray binaries and double neutron star mergers
Hamann, W. -R.; Oskinova, L. M.; Sander, A. A. C. +4 more
Standard binary evolutionary models predict a significant population of core helium-burning stars that lost their hydrogen-rich envelope after mass transfer via Roche-lobe overflow. However, there is a scarcity of observations of such stripped stars in the intermediate-mass regime (∼1.5 − 8 M⊙), which are thought to be prominent progeni…