Study of dynamical status of the globular cluster NGC 1851 using Ultraviolet Imaging Telescope

TL;DR

This study analyzes the dynamical state of globular cluster NGC 1851 using multiwavelength data, revealing its intermediate dynamical status through BSS distribution and dynamical parameters.

Contribution

It combines space and ground-based data to classify NGC 1851's dynamical state, introducing a detailed analysis of BSS radial distribution and dynamical parameters.

Findings

NGC 1851 shows a central peak and outer rise in BSS distribution.

The A+rh parameter is measured as 0.391, indicating intermediate dynamical status.

The cluster is classified as Family II, an intermediate dynamical state.

Abstract

We present the study of dynamical status of the globular cluster NGC 1851. A combination of multiwavelength space and ground-based data sets are used for the present analysis. In order to select the genuine cluster members, we used the astro-photometric data available from HST and GAIA-DR2 catalogs. The BSS radial distribution of the cluster is plotted from the center of the cluster to the outskirts. The radial distribution of BSS shows a central peak, followed by a dip at the intermediate radii (rmin ~ 90'') and a rising trend in the outskirts. We also estimated A+rh parameter as 0.391 +/- 0.006 to validate the findings of the radial distribution study. On the basis of the minima in the BSS radial distribution and the value of A+rh parameter, we conclude that NGC 1851 belongs to Family II classification and is an intermediate dynamical state cluster.