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19 April 2024 |
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NGC 3628-UCD1: A possible $omega$ Cen Analog Embedded in a Stellar Stream | | Zachary G. Jennings
; Aaron J. Romanowsky
; Jean P. Brodie
; Joachim Janz
; Mark A. Norris
; Duncan A. Forbes
; David Martinez-Delgado
; Martina Fagioli
; Samantha J. Penny
; | | Date: |
15 Sep 2015 | | Abstract: | Using Subaru/Suprime-Cam wide-field imaging and both Keck/ESI and LBT/MODS
spectroscopy, we identify and characterize a compact star cluster, which we
term NGC 3628-UCD1, embedded in a stellar stream around the spiral galaxy NGC
3628. The size and luminosity of UCD1 are similar to $omega$ Cen, the most
luminous Milky Way globular cluster, which has long been suspected to be the
stripped remnant of an accreted dwarf galaxy. The object has a magnitude of
$i=19.3$ mag (${
m L}_{
m i}=1.4 imes10^{6}~{
m L}_{odot}$). UCD1 is
marginally resolved in our ground-based imaging, with a half-light radius of
$sim10$ pc. We measure an integrated brightness for the stellar stream of
$i=13.1$ mag, with $(g-i)=1.0$. This would correspond to an accreted dwarf
galaxy with an approximate luminosity of ${
m L}_isim4.1 imes10^{8}~{
m
L}_{odot}$. Spectral analysis reveals that UCD1 has an age of $6.6$ Gyr ,
$[
m{Z}/
m{H}]=-0.75$, an $[{alpha}/
m{Fe}]=-0.10$. We propose that UCD1 is
an example of an $omega$ Cen-like star cluster possibly forming from the
nucleus of an infalling dwarf galaxy, demonstrating that at least some of the
massive star cluster population may be created through tidal stripping. | | Source: | arXiv, 1509.4710 | | Services: | Forum | Review | PDF | Favorites | |
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