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25 April 2024 |
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A New Hubble Space Telescope Distance to NGC 1569: Starburst Properties and IC 342 Group Membership | | Aaron J. Grocholski
; Alessandra Aloisi
; Roeland P. van der Marel
; Jennifer Mack
; Francesca Annibali
; Luca Angeretti
; Laura Greggio
; Enrico V. Held
; Donatella Romano
; Marco Sirianni
; Monica Tosi
; | | Date: |
1 Aug 2008 | | Abstract: | We present deep HST ACS/WFC photometry of the dwarf irregular galaxy NGC
1569, one of the closest and strongest nearby starburst galaxies. These data
allow us, for the first time, to unequivocally detect the tip of the red giant
branch and thereby determine the distance to NGC 1569. We find that this galaxy
is 3.36 +/- 0.20 Mpc away, considerably farther away than the typically assumed
distance of 2.2 +/- 0.6 Mpc. Previously thought to be an isolated galaxy due to
its shorter distance, our new distance firmly establishes NGC 1569 as a member
of the IC 342 group of galaxies. The higher density environment may help
explain the starburst nature of NGC 1569, since starbursts are often triggered
by galaxy interactions. On the other hand, the longer distance implies that NGC
1569 is an even more extreme starburst galaxy than previously believed.
Previous estimates of the rate of star formation for stars younger than ~ 1 Gyr
become stronger by more than a factor of 2. Stars older than this were not
constrained by previous studies. The dynamical masses of NGC 1569’s three super
star clusters, which are already known as some of the most massive ever
discovered, increase by ~53% to 6-7x10^5 solar masses. | | Source: | arXiv, 0808.0153 | | Services: | Forum | Review | PDF | Favorites | |
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