Seek and yee shall find. Try the 4th entry on a Google
search for "6946 Globular"
http://arxiv.org/abs/astro-ph/0104133
Open the PDF and look at the photo of the globular near
the end of the article. That thing is HUGE! It's also
relatively bright at Mag 13.2.
best
-Craig
--- David Kingsley <kingsley@No-Spam> wrote:
> >On Saturday night at CalStar I was shown a globular
> cluster in NGC
> >6946 in a 15" Dob.
> >
> >I had never heard of this object before, and found it
> astonishing
> >that any globular could be seen
> >at such a distance. Globulars I've seen in M31 are
> less remarkable
> >than the brigth glow the one I
> >was being shown was.
> >
> >I suspect it is really an HII region, and not a
> globular cluster.
> >Doing google searches on NGC
> >6949 shows that it is unusually rich in HII.
> >
> >Can anyone confirm that there is a bright HII region
> visible in this
> >galaxy? Or, can anyone point
> >to some literature describing a bright globular in it,
> visible from
> >over 15M light years?
> >
> >Thanks,
> >
> >Mark
>
> Hi Mark,
>
> We first started talking about 6946 at dinner
> Saturday night when
> Jim mentioned that the new issue of Scientific American
> has a good
> article on globular cluster formation, including the
> fact that some
> globular clusters are much newer than the ancient
> clusters of the
> Milky Way. I haven't seen the article, but had
> learned the same
> thing over the last year or so of the galactic and
> extragalactic
> globular cluster observing project I have been doing.
> I had
> observed the 6946 cluster as part of my extragalactic
> observing
> project last year at CalStar, and remembered the object
> as an
> observable example of a young cluster. Fortunately it
> is well
> illustrated in the image of 6946 found in that Concise
> Catalog of
> Deep Sky Objects from Springer that we were looking at
> with you over
> dinner. Jim and I both tracked it down again this
> year using the
> diagram in that book, which specifically highlights the
> region as a
> young globular cluster.
>
> For a primary literature reference, see:
>
> Larsen, S. S. , Brodie, J. P., Elmegreen, B.
> G., Efremov,
> Yu. N., Hodge, P. W. and Richtler, T. 2001:
> ``Structure and
> mass of a young globular cluster in NGC 6946'',
> ApJ 556 , 801-812 (astro-ph/0104133)
>
>
> The entire paper is available online at:
> http://adsabs.harvard.edu/bib_abs.html
>
> The brief synopsis is that this region appears to be an
> example of
> supermassive star cluster that has formed in the last
> 15 million
> years, and whose structure, properties and mass suggest
> that it will
> remain gravitationally bound as a globular cluster.
> A young
> globular to be sure, but that is part of why it is an
> interesting
> object.
>
> David Kingsley
>
>
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