Search Publications
MIDIS: The Relation between Strong (Hβ + [O III]) Emission, Star Formation, and Burstiness around the Epoch of Reionization
Nørgaard-Nielsen, H. U.; Östlin, G.; Güdel, M. +25 more
We investigate the properties of strong (Hβ + [O III]) emitters before and after the end of the "Epoch of Reionization" from z = 8 to z = 5.5. We make use of ultradeep JWST/NIRCam imaging in the parallel field (P2) of the MIRI Deep Imaging Survey (MIDIS) in the Hubble eXtreme Deep Field (H-XDF), in order to select prominent (Hβ + [O III]) emitters…
Lyman continuum leaker candidates at z ∼ 3-4 in the HDUV based on a spectroscopic sample of MUSE LAEs
Oesch, P. A.; Illingworth, G. D.; Verhamme, A. +15 more
Context. In recent years, a number of Lyman continuum (LyC) leaker candidates have been found at intermediate redshifts, providing insight into how the Universe was reionised at early cosmic times. There are now around 100 known LyC leakers at all redshifts, which enables us to analyse their properties statistically.
Aims: Here, we identify n…
JWST MIRI Detections of Hα and [O III] and a Direct Metallicity Measurement of the z = 10.17 Lensed Galaxy MACS0647‑JD
Costantin, Luca; Hutchison, Taylor A.; Larson, Rebecca L. +30 more
JWST spectroscopy has revolutionized our understanding of galaxies in the early Universe. Covering wavelengths up to 5.3 µm, NIRSpec can detect rest-frame optical Hα emission lines out to z = 7 and [O III] to z = 9.5. Observing these lines in more distant galaxies requires longer wavelength spectroscopy with MIRI. Here we present MIRI Medium…
Probing orbits of stellar mass objects deep in galactic nuclei with quasiperiodic eruptions. II. Population analysis
Pan, Zhen; Zhou, Cong; Huang, Lei +2 more
Quasiperiodic eruptions (QPEs) are intense repeating soft x-ray bursts with recurrence times about a few hours to a few weeks from galactic nuclei. Though the debates on the origin of QPEs have not completely settled down, more and more analyses favor the interpretation that QPEs are the result of collisions between a stellar mass object (a stella…
Abundant hydrocarbons in the disk around a very-low-mass star
Waters, L. B. F. M.; Olofsson, G.; Kamp, I. +40 more
Very-low-mass stars (those less than 0.3 solar masses) host orbiting terrestrial planets more frequently than other types of stars. The compositions of those planets are largely unknown but are expected to relate to the protoplanetary disk in which they form. We used James Webb Space Telescope mid-infrared spectroscopy to investigate the chemical …
Emission lines due to ionizing radiation from a compact object in the remnant of Supernova 1987A
Fox, O. D.; Blommaert, J. A. D. L.; Larsson, J. +31 more
The nearby Supernova 1987A was accompanied by a burst of neutrino emission, which indicates that a compact object (a neutron star or black hole) was formed in the explosion. There has been no direct observation of this compact object. In this work, we observe the supernova remnant with JWST spectroscopy, finding narrow infrared emission lines of a…
The Star-forming Main Sequence in JADES and CEERS at z > 1.4: Investigating the Burstiness of Star Formation
Shapley, Alice E.; Reddy, Naveen A.; Sanders, Ryan L. +5 more
We have used public JWST/NIRSpec and JWST/NIRCam observations from the CEERS and JADES surveys in order to analyze the star-forming main sequence (SFMS) over the redshift range 1.4 ≤ z < 7. We calculate the star formation rates (SFRs) of the galaxy sample using three approaches: Balmer line luminosity, spectral energy distribution (SED) fitting…
Galaxy Quenching at the High Redshift Frontier: A Fundamental Test of Cosmological Models in the Early Universe with JWST-CEERS
Maiolino, Roberto; Conselice, Christopher J.; Bluck, Asa F. L. +10 more
We present an analysis of the quenching of star formation in massive galaxies (M * > 109.5 M ⊙) within the first 0.5–3 Gyr of the Universe's history utilizing JWST-CEERS data. We utilize a combination of advanced statistical methods to accurately constrain the intrinsic dependence of quenching in a multidimensio…
Young Star Clusters Dominate the Production of Detached Black Hole–Star Binaries
Breivik, Katelyn; Rodriguez, Carl L.; Di Carlo, Ugo Niccolò +1 more
The recent discovery of two detached black hole–star (BH–star) binaries from Gaia's third data release has sparked interest in understanding the formation mechanisms of these systems. We investigate the formation of these systems by dynamical processes in young star clusters (SCs) and via isolated binary (IB) evolution, using a combination of dire…
Effect of Extinction on Quasar Luminosity Distances Determined from UV and X-Ray Flux Measurements
Zajaček, Michal; Czerny, Bożena; Khadka, Narayan +4 more
In Khadka et al., a sample of X-ray-detected reverberation-mapped quasars was presented and applied for the comparison of cosmological constraints inferred using two well-established relations in active galactic nuclei—the X-ray/UV luminosity (L X –L UV) relation and the broad-line region radius–luminosity (R–L) relation. L …