Speaker
Description
The Coma galaxy cluster has long been used as a cosmic laboratory. This is no coincidence, as it is one of the closest large galaxy clusters to us after the Virgo cluster. Its distance is large enough for the Hubble flow to dominate, but still close enough to be studied in detail.
In our research, we attempted to determine the Coma galaxy cluster's distance as precisely as possible using Type Ia supernovae that were discovered within it. We used several publicly available photometric data sets from the ZTF, ATLAS and YSE surveys, as well as the SALT3 code for multi-colour light curve fitting, to make the distance measurements. We also used our own photometric measurements from the 60 cm Schmidt and 80 cm RC telescopes at the Piszkéstető Observatory. Using all this data, we were able to measure the distance to the Coma cluster more precisely than before. Furthermore, we were able to determine the cluster's average redshift with high accuracy using SDSS spectroscopic data. We also determined the Hubble constant based on our own results.