Search Publications
Spectral classification of the 100 pc white dwarf population from Gaia-DR3 and the virtual observatory
Solano, E.; Rebassa-Mansergas, A.; Torres, S. +5 more
The third data release of Gaia has provided low-resolution spectra for ~100 000 white dwarfs (WDs) that, together with the excellent photometry and astrometry, represent an unrivalled benchmark for the study of this population. In this work, we first built a highly complete volume-limited sample consisting in 12 718 WDs within 100 pc from the Sun.…
EPOCHS VII: discovery of high-redshift (6.5 < z < 12) AGN candidates in JWST ERO and PEARLS data
Grogin, Norman A.; Koekemoer, Anton M.; Pirzkal, Nor +24 more
We present an analysis of a sample of robust high-redshift galaxies selected from the 'blank' fields of the Prime Extragalactic Areas for Reionization Science (PEARLS) survey and Early Release Observations (ERO) data from JWST with the aim of selecting candidate high-redshift active galactic nuclei (AGN). Sources were identified from this parent s…
A Milky Way-like barred spiral galaxy at a redshift of 3
Papovich, Casey; Finkelstein, Steven L.; Barro, Guillermo +30 more
The majority of massive disk galaxies in the local Universe show a stellar barred structure in their central regions, including our Milky Way1,2. Bars are supposed to develop in dynamically cold stellar disks at low redshift, as the strong gas turbulence typical of disk galaxies at high redshift suppresses or delays bar formation3,…
Streams on FIRE: Populations of Detectable Stellar Streams in the Milky Way and FIRE
Lewis, Geraint F.; Erkal, Denis; Bland-Hawthorn, Joss +20 more
We present the first detailed comparison of populations of dwarf galaxy stellar streams in cosmological simulations and the Milky Way. In particular, we compare streams identified around 13 Milky Way analogs in the FIRE-2 simulations to streams observed by the Southern Stellar Stream Spectroscopic Survey (S 5). For an accurate compariso…
Millimeter Observations of the Type II SN 2023ixf: Constraints on the Proximate Circumstellar Medium
Rao, Ramprasad; Eftekhari, Tarraneh; Berger, Edo +10 more
We present 1.3 mm (230 GHz) observations of the recent and nearby Type II supernova, SN 2023ixf, obtained with the Submillimeter Array (SMA) at 2.6-18.6 days after explosion. The observations were obtained as part the SMA Large Program, POETS (Pursuit of Extragalactic Transients with the SMA). We do not detect any emission at the location of SN 20…
The Dusty Red Supergiant Progenitor and the Local Environment of the Type II SN 2023ixf in M101
Niu, Zexi; Sun, Ning-Chen; Liu, Jifeng +3 more
As one of the closest supernovae (SNe) in the last decade, SN 2023ixf is an unprecedented target to investigate the progenitor star that exploded. However, there is still significant uncertainty in the reported progenitor properties. In this work, we present a detailed study of SN 2023ixf's progenitor with two independent analyses. We first modele…
The Young and the Wild: What Happens to Protoclusters Forming at Redshift z ≈ 4?
Dolag, Klaus; Dannerbauer, Helmut; Remus, Rhea-Silvia
Using one of the largest volumes of the hydrodynamical cosmological simulation suit Magneticum, we study the evolution of protoclusters identified at redshift ≈ 4, with properties similar to the well-observed protocluster SPT2349-56. We identify 42 protoclusters in the simulation as massive and equally rich in substructures as observed, confirming…
Rapid Quenching of Galaxies at Cosmic Noon
Conroy, Charlie; Johnson, Benjamin D.; Belli, Sirio +6 more
The existence of massive quiescent galaxies at high redshift seems to require rapid quenching, but it is unclear whether all quiescent galaxies have gone through this phase and what physical mechanisms are involved. To study rapid quenching, we use rest-frame colors to select 12 young quiescent galaxies at z ~ 1.5. From spectral energy distributio…
The ALMA Survey of 70 µm Dark High-mass Clumps in Early Stages (ASHES). IX. Physical Properties and Spatial Distribution of Cores in IRDCs
Jackson, James M.; Sanhueza, Patricio; Lu, Xing +13 more
The initial conditions found in infrared dark clouds (IRDCs) provide insights on how high-mass stars and stellar clusters form. We have conducted high-angular resolution and high-sensitivity observations toward thirty-nine massive IRDC clumps, which have been mosaicked using the 12 and 7 m arrays from the Atacama Large Millimeter/submillimeter Arr…
Color Gradients and Half-mass Radii of Galaxies Out to z = 2 in the CANDELS/3D-HST Fields: Further Evidence for Important Differences in the Evolution of Mass-weighted and Light-weighted Sizes
Mowla, Lamiya; van Dokkum, Pieter; Miller, Tim B.
Recent studies have indicated that the ratio between half-mass and half-light radii, r mass/r light, varies significantly as a function of stellar mass and redshift, complicating the interpretation of the ubiquitous r light - M * relation. To investigate, in this study we construct the light and color pr…