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Review details strong gravitational lensing and microlensing of supernovae for cosmology
Key points
- Lensed supernovae are a new probe for cosmology and astrophysics.
- Time delays in lensed supernovae can measure cosmological distances.
- Upcoming Rubin Observatory LSST will increase lensed supernova discoveries.
- Challenges include the rarity and difficulty in finding lensed supernovae.
Emerging Research Field
Strong gravitational lensing and microlensing of supernovae (SNe) are becoming a new method for cosmological and astrophysical research. This field is reviewed, beginning with the initial discoveries of strongly lensed SNe.
Cosmological Applications
The time delays between multiple SN images can be used to measure cosmological distances and constrain cosmological parameters, particularly the Hubble constant. New methods for measuring these time delays have been developed. The upcoming Rubin Observatory Legacy Survey of Space and Time (LSST) is expected to provide a sample of lensed SNe that will offer competitive cosmological constraints.
Astrophysical Probes
Lensed SNe also serve as astrophysical probes. They can constrain SN progenitors, enable high-redshift SN spectra through lensing magnifications, infer SN sizes via microlensing, and measure dust properties in galaxies.
Current Challenges and Future Outlook
A primary challenge in this field is the rarity and difficulty in finding lensed SNe. Various methods and ongoing efforts are described to locate these events. Forecasts for the properties of the expected sample from upcoming surveys, especially the LSST, are provided, along with the observational follow-up requirements for scientific studies. The coming years are anticipated to see an increase in lensed SN discoveries.
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Reporting from
A new review article summarizes the emerging research field of strong gravitational lensing and microlensing of supernovae. This technique offers a new method to measure cosmological distances, constrain the Hubble constant, and probe astrophysical properties of supernovae and galaxies.