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Speaker: Atsushi J. Nishizawa (Gifu Shotoku Gakuen University) – Title: Subaru HSC medium band filter survey and photometric redshift of galaxies
February 25 @ 4:00 pm - 5:00 pm
Research Progress Meeting
Date: February 25, 2025
Time: 4:00- 5:00 pm
Location: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]
Speaker: Atsushi J. Nishizawa (Gifu Shotoku Gakuen University)
Title: Subaru HSC medium band filter survey and photometric redshift of galaxies
Abstract: Photometric redshift (photo-z) is a well-known technique for measuring the redshift of galaxies using imaging observations. The most challenging aspect of photo-z estimation is that the available information is quite limited, as most imaging surveys utilize broad-band filters, resulting in relatively low wavelength resolution. Traditionally, photo-z is measured by fitting model galaxy spectral energy distributions (SEDs) to the observed fluxes and determining the optimal redshift for each galaxy. An alternative approach is to estimate redshifts using machine learning methods, which can learn complex relationships between observables and redshift.
However, significant improvement in photo-z accuracy is unlikely without incorporating additional information. One possible avenue is to extend the wavelength coverage, while another is to improve the wavelength resolution. We are currently developing medium-band filters to be installed on the Hyper-Suprime Cam at the prime focus of the Subaru Telescope. These medium-band filters will offer moderate spectral resolution and high spatial resolution, providing a substantial amount of additional information. We are preparing to conduct a medium-band filter survey in the coming semesters. In this talk, we will introduce several science cases in collaboration with Euclid, the Roman Space Telescope, DESI-II, and the Subaru Prime Focus Spectrograph (PFS).
Join Zoom Meeting
https://lbnl.zoom.us/j/95679892182?pwd=RU5xU2dDRFNabnR1U3pQMklkYWFIdz09
Meeting ID: 956 7989 2182
Passcode: 169037