Abstract Details
| Name: Suman Bhattacharyya Affiliation: University Of Kalyani Conference ID: ASI2019_46 Title : Reconstruction of the Hubble diagram using redshift and relative distant data from SDSS spectral data of elliptical galaxies. Authors and Co-Authors : Suman Bhattacharyya and Dr. Jyoti Prasad Saha (Professor at Physics dept of Kalyani University.) Abstract Type : Poster Abstract Category : Extragalactic Astronomy Abstract : We have studied the data of over 55 galaxy clusters taken from SDSS DR14 database and derived the redshift (z) vs apparent magnitude relation for our sample to show that the recent DR14 data is efficient enough to predict the Hubble constant (Ho) value well (galaxies with z around 0.2). Our analysis show that the slope of the line is 0.1972 where the Hubble line should have a slope of 0.2 . We have farther used the SDSS data to determine the expansion of the Universe by reconstructing the Hubble diagram which shows that the Universe is not just expanding but expanding in an ordered manner. This rate of expansion is approximately constant till a range of distance, beyond which the rate is not constant anymore (points can’t be plotted on the Hubble line). Since the distance is in approximation so relative distance unit has been used for distance measurement using the magnitude of the elliptical galaxy in a specific Galaxy cluster. |