Erik Zackrisson
Professor at Department of Physics and Astronomy; Astronomy and Space Physics
- Telephone:
- +46 18 471 59 75
- E-mail:
- erik.zackrisson@physics.uu.se
- Visiting address:
- Ångströmlaboratoriet, Regementsvägen 10
- Postal address:
- Box 516
751 37 UPPSALA
Short presentation
Professor of Astrophysics, Distinguished University Teacher
Keywords
- machine learning
- astronomy
- cosmology
- searching for extraterrestrial intelligence
- james webb space telescope
- the first stars
- the first galaxies
- the first black holes

Publications
Selection of publications
Project Hephaistos – II. Dyson sphere candidates from Gaia DR3, 2MASS, and WISE
Part of Monthly notices of the Royal Astronomical Society, p. 695-707, 2024
- DOI for Project Hephaistos – II. Dyson sphere candidates from Gaia DR3, 2MASS, and WISE
- Download full text (pdf) of Project Hephaistos – II. Dyson sphere candidates from Gaia DR3, 2MASS, and WISE
Part of Monthly notices of the Royal Astronomical Society, p. 2727-2746, 2024
- DOI for The detection and characterization of highly magnified stars with JWST: prospects of finding Population III
- Download full text (pdf) of The detection and characterization of highly magnified stars with JWST: prospects of finding Population III
JWST Reveals a Possible z similar to 11 Galaxy Merger in Triply Lensed MACS0647-JD
Part of Astrophysical Journal Letters, 2023
- DOI for JWST Reveals a Possible z similar to 11 Galaxy Merger in Triply Lensed MACS0647-JD
- Download full text (pdf) of JWST Reveals a Possible z similar to 11 Galaxy Merger in Triply Lensed MACS0647-JD
Part of Astronomy and Astrophysics, 2023
- DOI for JWST's PEARLS: A new lens model for ACT-CL J0102-4915, "El Gordo," and the first red supergiant star at cosmological distances discovered by JWST
- Download full text (pdf) of JWST's PEARLS: A new lens model for ACT-CL J0102-4915, "El Gordo," and the first red supergiant star at cosmological distances discovered by JWST
Two Lensed Star Candidates at z similar or equal to 4.8 behind the Galaxy Cluster MACS J0647.7+7015
Part of Astrophysical Journal Letters, 2023
- DOI for Two Lensed Star Candidates at z similar or equal to 4.8 behind the Galaxy Cluster MACS J0647.7+7015
- Download full text (pdf) of Two Lensed Star Candidates at z similar or equal to 4.8 behind the Galaxy Cluster MACS J0647.7+7015
Part of Astronomical Journal, 2023
- DOI for JWST PEARLS. Prime extragalactic areas for reionization and lensing science: project overview and first results
- Download full text (pdf) of JWST PEARLS. Prime extragalactic areas for reionization and lensing science: project overview and first results
Project Hephaistos - I. Upper limits on partial Dyson spheres in the Milky Way
Part of Monthly notices of the Royal Astronomical Society, p. 2988-3000, 2022
- DOI for Project Hephaistos - I. Upper limits on partial Dyson spheres in the Milky Way
- Download full text (pdf) of Project Hephaistos - I. Upper limits on partial Dyson spheres in the Milky Way
A highly magnified star at redshift 6.2
Part of Nature, p. 815-818, 2022
Possible Systematic Rotation in the Mature Stellar Population of a z=9.1 Galaxy
Part of Astrophysical Journal Letters, 2022
- DOI for Possible Systematic Rotation in the Mature Stellar Population of a z=9.1 Galaxy
- Download full text (pdf) of Possible Systematic Rotation in the Mature Stellar Population of a z=9.1 Galaxy
JWST Imaging of Earendel, the Extremely Magnified Star at Redshift z=6.2
Part of Astrophysical Journal Letters, 2022
- DOI for JWST Imaging of Earendel, the Extremely Magnified Star at Redshift z=6.2
- Download full text (pdf) of JWST Imaging of Earendel, the Extremely Magnified Star at Redshift z=6.2
Part of Publications of the Astronomical Society of Japan, 2019
Part of Astrophysical Journal, 2019
SETI with Gaia: The Observational Signatures of Nearly Complete Dyson Spheres
Part of Astrophysical Journal, 2018
On the Detection of Supermassive Primordial Stars
Part of Astrophysical Journal Letters, 2018
The onset of star formation 250 million years after the Big Bang
Part of Nature, p. 392-395, 2018
Part of Astrophysical Journal, 2017
Unveiling the First Black Holes With JWST: Multi-wavelength Spectral Predictions
Part of Astrophysical Journal, 2017
Detection of an oxygen emission line from a high-redshift galaxy in the reionization epoch
Part of Science, p. 1559-1562, 2016
Terrestrial Planets Across Space And Time
Part of ASTROPHYSICAL JOURNAL, 2016
Part of Astrophysical Journal, 2015
Recent publications
Part of Astronomy and Astrophysics, 2025
- DOI for Explanations for the two-component spectral energy distributions of gravitationally lensed stars at high redshifts
- Download full text (pdf) of Explanations for the two-component spectral energy distributions of gravitationally lensed stars at high redshifts
Reaching for the stars - JWST/NIRSpec spectroscopy of a lensed star candidate at z=4.76
Part of Monthly notices of the Royal Astronomical Society, 2024
Part of Monthly notices of the Royal Astronomical Society, p. 7965-7973, 2024
- DOI for First Light and Reionization Epoch Simulations (flares): XIV. The Balmer/4000 Å breaks of distant galaxies
- Download full text (pdf) of First Light and Reionization Epoch Simulations (flares): XIV. The Balmer/4000 Å breaks of distant galaxies
Bound star clusters observed in a lensed galaxy 460 Myr after the Big Bang
Part of Nature, p. 513-516, 2024
- DOI for Bound star clusters observed in a lensed galaxy 460 Myr after the Big Bang
- Download full text (pdf) of Bound star clusters observed in a lensed galaxy 460 Myr after the Big Bang
Part of Ground-Based and Airborne Instrumentation for Astronomy X, 2024
All publications
Articles in journal
Part of Astronomy and Astrophysics, 2025
- DOI for Explanations for the two-component spectral energy distributions of gravitationally lensed stars at high redshifts
- Download full text (pdf) of Explanations for the two-component spectral energy distributions of gravitationally lensed stars at high redshifts
Reaching for the stars - JWST/NIRSpec spectroscopy of a lensed star candidate at z=4.76
Part of Monthly notices of the Royal Astronomical Society, 2024
Part of Monthly notices of the Royal Astronomical Society, p. 7965-7973, 2024
- DOI for First Light and Reionization Epoch Simulations (flares): XIV. The Balmer/4000 Å breaks of distant galaxies
- Download full text (pdf) of First Light and Reionization Epoch Simulations (flares): XIV. The Balmer/4000 Å breaks of distant galaxies
Bound star clusters observed in a lensed galaxy 460 Myr after the Big Bang
Part of Nature, p. 513-516, 2024
- DOI for Bound star clusters observed in a lensed galaxy 460 Myr after the Big Bang
- Download full text (pdf) of Bound star clusters observed in a lensed galaxy 460 Myr after the Big Bang
Galaxy formation and symbiotic evolution with the inter-galactic medium in the age of ELT-ANDES
Part of Experimental astronomy, 2024
Project Hephaistos – II. Dyson sphere candidates from Gaia DR3, 2MASS, and WISE
Part of Monthly notices of the Royal Astronomical Society, p. 695-707, 2024
- DOI for Project Hephaistos – II. Dyson sphere candidates from Gaia DR3, 2MASS, and WISE
- Download full text (pdf) of Project Hephaistos – II. Dyson sphere candidates from Gaia DR3, 2MASS, and WISE
Spectroscopic characterisation of gravitationally lensed stars at high redshifts
Part of Astronomy and Astrophysics, 2024
- DOI for Spectroscopic characterisation of gravitationally lensed stars at high redshifts
- Download full text (pdf) of Spectroscopic characterisation of gravitationally lensed stars at high redshifts
Part of Astrophysical Journal, 2024
- DOI for JWST MIRI Detections of Hα and [O iii] and a Direct Metallicity Measurement of the z=10.17 Lensed Galaxy MACS0647-JD
- Download full text 1 (pdf) of JWST MIRI Detections of Hα and [O iii] and a Direct Metallicity Measurement of the z=10.17 Lensed Galaxy MACS0647-JD
- Download full text 2 (pdf) of JWST MIRI Detections of Hα and [O iii] and a Direct Metallicity Measurement of the z=10.17 Lensed Galaxy MACS0647-JD
JWST NIRSpec Spectroscopy of the Triply Lensed z=10.17 Galaxy MACS0647-JD
Part of Astrophysical Journal, 2024
- DOI for JWST NIRSpec Spectroscopy of the Triply Lensed z=10.17 Galaxy MACS0647-JD
- Download full text (pdf) of JWST NIRSpec Spectroscopy of the Triply Lensed z=10.17 Galaxy MACS0647-JD
Part of Astrophysical Journal, 2024
- DOI for The Extended [C II] under Construction?: Observation of the Brightest High-z Lensed Star-forming Galaxy at z=6.2
- Download full text (pdf) of The Extended [C II] under Construction?: Observation of the Brightest High-z Lensed Star-forming Galaxy at z=6.2
To be, or not to be: Balmer breaks in high-z galaxies with JWST
Part of Monthly notices of the Royal Astronomical Society, p. 1299-1307, 2024
- DOI for To be, or not to be: Balmer breaks in high-z galaxies with JWST
- Download full text (pdf) of To be, or not to be: Balmer breaks in high-z galaxies with JWST
Part of Astronomy and Astrophysics, 2024
- DOI for A search for high-redshift direct-collapse black hole candidates in the PEARLS north ecliptic pole field
- Download full text (pdf) of A search for high-redshift direct-collapse black hole candidates in the PEARLS north ecliptic pole field
Part of Monthly notices of the Royal Astronomical Society, p. 2727-2746, 2024
- DOI for The detection and characterization of highly magnified stars with JWST: prospects of finding Population III
- Download full text (pdf) of The detection and characterization of highly magnified stars with JWST: prospects of finding Population III
Part of Astronomy and Astrophysics, 2023
- DOI for JWST's PEARLS: Mothra, a new kaiju star at z=2.091 extremely magnified by MACS0416, and implications for dark matter models
- Download full text (pdf) of JWST's PEARLS: Mothra, a new kaiju star at z=2.091 extremely magnified by MACS0416, and implications for dark matter models
JWST Reveals a Possible z similar to 11 Galaxy Merger in Triply Lensed MACS0647-JD
Part of Astrophysical Journal Letters, 2023
- DOI for JWST Reveals a Possible z similar to 11 Galaxy Merger in Triply Lensed MACS0647-JD
- Download full text (pdf) of JWST Reveals a Possible z similar to 11 Galaxy Merger in Triply Lensed MACS0647-JD
Part of Monthly notices of the Royal Astronomical Society, p. 3935-3948, 2023
- DOI for First Light And Reionization Epoch Simulations (FLARES) VII: The star formation and metal enrichment histories of galaxies in the early Universe
- Download full text (pdf) of First Light And Reionization Epoch Simulations (FLARES) VII: The star formation and metal enrichment histories of galaxies in the early Universe
On the observability and identification of Population III galaxies with JWST
Part of Monthly notices of the Royal Astronomical Society, p. 5328-5352, 2023
- DOI for On the observability and identification of Population III galaxies with JWST
- Download full text (pdf) of On the observability and identification of Population III galaxies with JWST
Part of Astrophysical Journal, 2023
- DOI for The 300 pc Resolution Imaging of a z=8.31 Galaxy: Turbulent Ionized Gas and Potential Stellar Feedback 600 Million Years after the Big Bang
- Download full text (pdf) of The 300 pc Resolution Imaging of a z=8.31 Galaxy: Turbulent Ionized Gas and Potential Stellar Feedback 600 Million Years after the Big Bang
Part of Astronomy and Astrophysics, 2023
- DOI for JWST's PEARLS: A new lens model for ACT-CL J0102-4915, "El Gordo," and the first red supergiant star at cosmological distances discovered by JWST
- Download full text (pdf) of JWST's PEARLS: A new lens model for ACT-CL J0102-4915, "El Gordo," and the first red supergiant star at cosmological distances discovered by JWST
Part of Astrophysical Journal, 2023
- DOI for Detections of [C ii] 158 mu m and [O iii] 88 mu m in a Local Lyman Continuum Emitter, Mrk 54, and Its Implications to High-redshift ALMA Studies*
- Download full text (pdf) of Detections of [C ii] 158 mu m and [O iii] 88 mu m in a Local Lyman Continuum Emitter, Mrk 54, and Its Implications to High-redshift ALMA Studies*
Two Lensed Star Candidates at z similar or equal to 4.8 behind the Galaxy Cluster MACS J0647.7+7015
Part of Astrophysical Journal Letters, 2023
- DOI for Two Lensed Star Candidates at z similar or equal to 4.8 behind the Galaxy Cluster MACS J0647.7+7015
- Download full text (pdf) of Two Lensed Star Candidates at z similar or equal to 4.8 behind the Galaxy Cluster MACS J0647.7+7015
Part of Astronomical Journal, 2023
- DOI for JWST PEARLS. Prime extragalactic areas for reionization and lensing science: project overview and first results
- Download full text (pdf) of JWST PEARLS. Prime extragalactic areas for reionization and lensing science: project overview and first results
RELICS: Small-scale Star Formation in Lensed Galaxies at z=6-10
Part of Astrophysical Journal, 2023
- DOI for RELICS: Small-scale Star Formation in Lensed Galaxies at z=6-10
- Download full text (pdf) of RELICS: Small-scale Star Formation in Lensed Galaxies at z=6-10
Finding Lensed Direct-collapse Black Holes and Supermassive Primordial Stars
Part of Astrophysical Journal Letters, 2022
- DOI for Finding Lensed Direct-collapse Black Holes and Supermassive Primordial Stars
- Download full text (pdf) of Finding Lensed Direct-collapse Black Holes and Supermassive Primordial Stars
Project Hephaistos - I. Upper limits on partial Dyson spheres in the Milky Way
Part of Monthly notices of the Royal Astronomical Society, p. 2988-3000, 2022
- DOI for Project Hephaistos - I. Upper limits on partial Dyson spheres in the Milky Way
- Download full text (pdf) of Project Hephaistos - I. Upper limits on partial Dyson spheres in the Milky Way
A highly magnified star at redshift 6.2
Part of Nature, p. 815-818, 2022
Part of Monthly notices of the Royal Astronomical Society, p. 3030-3044, 2022
- DOI for Conditions for detecting lensed Population III galaxies in blind surveys with the James Webb Space Telescope, the Roman Space Telescope, and Euclid
- Download full text (pdf) of Conditions for detecting lensed Population III galaxies in blind surveys with the James Webb Space Telescope, the Roman Space Telescope, and Euclid
Possible Systematic Rotation in the Mature Stellar Population of a z=9.1 Galaxy
Part of Astrophysical Journal Letters, 2022
- DOI for Possible Systematic Rotation in the Mature Stellar Population of a z=9.1 Galaxy
- Download full text (pdf) of Possible Systematic Rotation in the Mature Stellar Population of a z=9.1 Galaxy
JWST Imaging of Earendel, the Extremely Magnified Star at Redshift z=6.2
Part of Astrophysical Journal Letters, 2022
- DOI for JWST Imaging of Earendel, the Extremely Magnified Star at Redshift z=6.2
- Download full text (pdf) of JWST Imaging of Earendel, the Extremely Magnified Star at Redshift z=6.2
Part of Monthly notices of the Royal Astronomical Society, p. 2331-2342, 2022
Part of Astrophysical Journal, 2021
A puzzling non-detection of [O III] and [C II] from a z ≈ 7.7 galaxy observed with ALMA
Part of Astronomy and Astrophysics, 2021
Galaxy population constraints on cosmology and star formation in the early Universe
Part of The Astrophysical Journal, 2021
Part of Monthly notices of the Royal Astronomical Society, p. 1706-1712, 2020
Testing an indirect method for identifying galaxies with high levels of Lyman continuum leakage
Part of Monthly notices of the Royal Astronomical Society, p. 3095-3114, 2020
Finding Direct-collapse Black Holes at Birth
Part of Astrophysical Journal Letters, 2020
ALMA uncovers the [C II] emission and warm dust continuum in a z=8.31 Lyman break galaxy
Part of Monthly notices of the Royal Astronomical Society, p. 4294-4307, 2020
Part of Monthly notices of the Royal Astronomical Society, p. 855-870, 2020
The case against gravitational millilensing in the multiply-imaged quasar B1152+199
Part of Monthly notices of the Royal Astronomical Society, p. 742-748, 2020
Part of Monthly notices of the Royal Astronomical Society, p. 5277-5286, 2020
Balmer breaks in simulated galaxies at z > 6
Part of Monthly notices of the Royal Astronomical Society, p. 3827-3835, 2019
On the detection of supermassive primordial stars - II. Blue supergiants
Part of Monthly notices of the Royal Astronomical Society, p. 3995-4003, 2019
Part of Publications of the Astronomical Society of Japan, 2019
Part of Astrophysical Journal, 2019
SETI with Gaia: The Observational Signatures of Nearly Complete Dyson Spheres
Part of Astrophysical Journal, 2018
Aligned metal absorbers and the ultraviolet background at the end of reionization
Part of Monthly notices of the Royal Astronomical Society, p. 4717-4727, 2018
Part of Monthly notices of the Royal Astronomical Society, p. 368-376, 2018
- DOI for Lyman continuum leakage versus quenching with the James Webb Space Telescope: the spectral signatures of quenched star formation activity in reionization-epoch galaxies
- Download full text 1 (pdf) of Lyman continuum leakage versus quenching with the James Webb Space Telescope: the spectral signatures of quenched star formation activity in reionization-epoch galaxies
- Download full text 2 (pdf) of Lyman continuum leakage versus quenching with the James Webb Space Telescope: the spectral signatures of quenched star formation activity in reionization-epoch galaxies
On the Detection of Supermassive Primordial Stars
Part of Astrophysical Journal Letters, 2018
Part of Monthly notices of the Royal Astronomical Society, p. 2628-2649, 2018
The Lyman Alpha Reference Sample: IX. Revelations from deep surface photometry
Part of Astronomy and Astrophysics, 2018
The onset of star formation 250 million years after the Big Bang
Part of Nature, p. 392-395, 2018
Part of Astrophysical Journal, 2017
Part of Astrophysical Journal, 2017
Unveiling the First Black Holes With JWST: Multi-wavelength Spectral Predictions
Part of Astrophysical Journal, 2017
Probing cold dark matter subhaloes with simulated ALMA observations of macrolensed sub-mm galaxies
Part of Monthly notices of the Royal Astronomical Society, p. 129-140, 2017
- DOI for Probing cold dark matter subhaloes with simulated ALMA observations of macrolensed sub-mm galaxies
- Download full text (pdf) of Probing cold dark matter subhaloes with simulated ALMA observations of macrolensed sub-mm galaxies
Part of Monthly notices of the Royal Astronomical Society, p. 4034-4038, 2017
- DOI for An analytic resolution to the competition between Lyman-Werner radiation and metal winds in direct collapse black hole hosts
- Download full text (pdf) of An analytic resolution to the competition between Lyman-Werner radiation and metal winds in direct collapse black hole hosts
The minimum halo mass for star formation at z=6-8
Part of Monthly notices of the Royal Astronomical Society, p. 1633-1639, 2017
Part of Astrophysical Journal, 2017
Lyman-Werner escape fractions from the first galaxies
Part of Monthly notices of the Royal Astronomical Society, p. 2288-2300, 2017
A multiply imaged z similar to 6.3 Lyman a emitter candidate behind Abell 2261
Part of Monthly notices of the Royal Astronomical Society, p. 768-777, 2017
Part of Astrophysical Journal, 2016
Local starburst galaxies and their descendants: Statistics from the Sloan Digital Sky Survey
Part of Astronomy and Astrophysics, 2016
The Lyman alpha reference sample VI. Lyman alpha escape from the edge-on disk galaxy Mrk 1486
Part of Astronomy and Astrophysics, 2016
Part of Monthly notices of the Royal Astronomical Society, p. 4296-4322, 2016
Part of Astronomy and Astrophysics, 2016
Detecting direct collapse black holes: making the case for CR7
Part of Monthly notices of the Royal Astronomical Society, p. 4003-4010, 2016
Detection of an oxygen emission line from a high-redshift galaxy in the reionization epoch
Part of Science, p. 1559-1562, 2016
The soft, fluctuating UVB at z similar to 6 as traced by C IV, Si IV, and C II
Part of Monthly notices of the Royal Astronomical Society, p. 2299-2310, 2016
Terrestrial Planets Across Space And Time
Part of ASTROPHYSICAL JOURNAL, 2016
Primordial star clusters at extreme magnification
Part of Monthly notices of the Royal Astronomical Society, p. 3057-3063, 2015
A SEARCH FOR POPULATION III GALAXIES IN CLASH. I. SINGLY IMAGED CANDIDATES AT HIGH REDSHIFT
Part of Astrophysical Journal, 2015
The Brightest Young Star Clusters In Ngc 5253
Part of Astrophysical Journal, 2015
- DOI for The Brightest Young Star Clusters In Ngc 5253
- Download full text (pdf) of The Brightest Young Star Clusters In Ngc 5253
Part of Astrophysical Journal, 2015
Part of Astrophysical Journal, 2015
STRONG LENSING BY SUBHALOS IN THE DWARF-GALAXY-MASS RANGE. II. DETECTION PROBABILITIES
Part of Astrophysical Journal, p. 1552-1558, 2009
Part of Astrophysical Journal, p. 242-251, 2008
Constraining the mass of the GRB 030329 progenitor
Part of Monthly notices of the Royal Astronomical Society, p. 1227-1236, 2008
The impact of nebular emission on the broadband fluxes of high-redshift galaxies
Part of Astrophysical Journal, 2008
Part of Monthly notices of the Royal Astronomical Society, p. 720-728, 2008
High-redshift microlensing and the spatial distribution of dark matter in the form of MACHOs
Part of Astronomy and Astrophysics, p. 453-465, 2007
Stellar dynamics of blue compact galaxies: I. Decoupled star-gas kinematics in ESO 400-G43
Part of Astronomy & Astrophysics, 2004
The temporal and spatial evolution of the starburst in ESO 338-IG04 as probed by its star clusters
Part of Astronomy & Astrophysics, p. 887, 2003
Conference papers
Part of Ground-Based and Airborne Instrumentation for Astronomy X, 2024
Part of GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY IX, 2022
Flipping the physics classroom – First observations
2021
ELT-HIRES, the high resolution spectrograph for the ELT: Phase A study and path to construction
Part of Ground-based and Airborne Instrumentation for Astronomy VIII, 2020
Constraining Lyman continuum escape using Machine Learning
Part of Peering towards Cosmic Dawn, p. 254-258, 2018
ELT-HIRES, the high resolution spectrograph for the ELT: results from the Phase A study
Part of GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VII, 2018
EELT-HIRES the high-resolution spectrograph for the E-ELT
Part of GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VI, 2016
Modelling the red halos of blue compact galaxies
Part of Starbursts - From 30 Doradus to Lyman Break Galaxies, 2005
On planetary-mass compact objects as dark matter
Part of Dark matter in galaxies, 2004