33 citations · 119 across the 18 of their papers we have counts for
6 papers · 1 filter
Project Hephaistos -- IV. James Webb Space Telescope Observations of Two Dyson Sphere Candidates
Erik Zackrisson, Arjan Bik, Anita Ali Asgar +11
We report on JWST/MIRI imaging and spectroscopy of two M-dwarf stars previously singled out by project Hephaistos as potential Dyson-sphere candidates (their candidates D and E) du…
Mirror images of lensed star clusters with mismatched spectral energy distributions: A possible signature of top-heavy stellar initial mass functions and extreme stars in high-redshift star clusters
Erik Zackrisson, Jose M. Diego, Jose M. Palencia +4
Strongly lensed star clusters have recently been detected up to redshift in galaxy cluster fields using the James Webb Space Telescope (JWST). When pairs of mirror im…
Explanations for the two-component spectral energy distributions of gravitationally lensed stars at high redshifts
Armin Nabizadeh, Erik Zackrisson, Emma Lundqvist +4
Observations of gravitationally lensed, high-mass stars at redshifts occasionally reveal spectral energy distributions that contain two components with different effecti…
Identification of 40 gravitationally magnified stars in a galaxy at redshift of 0.725
Yoshinobu Fudamoto, Fengwu Sun, Jose M. Diego +44
Strong gravitational magnifications enable to detect faint background sources, resolve their internal structures, and even identify individual stars in distant galaxies. Highly mag…
The detection and characterization of highly magnified stars with JWST: Prospects of finding Population III
Erik Zackrisson, Adam Hultquist, Aron Kordt +10
Gravitational lensing may render individual high-mass stars detectable out to cosmological distances, and several extremely magnified stars have in recent years been detected out t…
A search for high-redshift direct-collapse black hole candidates in the PEARLS north ecliptic pole field
Armin Nabizadeh, Erik Zackrisson, Fabio Pacucci +31
Direct-collapse black holes (DCBHs) of mass - that form in HI-cooling halos in the early Universe are promising progenitors of the $\gtrsim 10^9 {M}_\odo…