### Abstract

Invited Talk - Splinter JungeAG

Tuesday, 12 September 2023, 14:30 (H 3007)

## Youth's research talk: Determination of the Hubble Constant by 1a supernovae

Maximilian Alt

Privates Johannes-Gymnasium

The expansion of the universe can be quantified by the Hubble Constant. This constant can be determined through different methods, such as by the cosmic microwave background, the Tully-Fisher relation, or type 1a supernovae. Each method gives different values of the Hubble Constant, which results in a discussion about the value and whether it is a constant at all. That is why I wanted to measure the Hubble Constant through type 1a supernovae on my own. For this purpose, I took pictures and spectra of 1a supernovae at two different observatories in the Eifel Region and used the data of a worldwide telescope network (Las Cumbres Observatory), where I was also able to create observing assignments myself. At first, I used these spectra to evaluate the type of each supernova and then to determine the value of the cosmological redshift of the supernova. After that, I used pictures of the supernovae, which were made with a blue filter to receive the distance of each supernova. Then I plotted the velocity of the supernova which results from the cosmological redshift against the distance of the respective supernova to obtain the Hubble Constant as 69,80 (km/s)/Mpc ± 5,89(km/s)/Mpc.