Contributed Talk - Splinter Compact
A new dense association of stars at the Galactic Center
S. Elaheh Hosseini, Andreas Eckart
Cologne University, Max Planck Institute for Radio Astronomy
We focus on the 40 sources adjacent to the bow-shock source IRS1W, located at the distance of 6.05'' north-east from the supermassive black hole Sagittarius A*. We present the first proper-motion measurements of these sources which reveals we face a subgroup of co-moving stars. We detected these stars including IRS1W in H, K_s, L'. We confirm IRS 1W and its adjacent sources are forming a dense association of stars. We suggest they could be bound by an intermediate mass black hole (IMBH) or can be the result of a disk-like distribution projected close to the line of sight. We speculate about the existence of an IMBH or a disk explanation or the wind effect. Our measurements for the first time reveal that the dense association of stars including IRS1W is a co-moving group of stars at the distance of 6.05'' north-east from the supermassive black hole Sagittarius A*. The sources in this collection of stars have a similar proper motion and a common nature. This association of stars might be the remnant of a massive stellar cluster that has contained an intermediate mass black hole. The cluster exhibits features similar to IRS13N cluster. We present the proper motion of a group of co-moving stars in the region of IRS1W for the first time.