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Old 19-05-2018, 12:19 PM
Placidus (Mike and Trish)
Narrowing the band

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Barnard's Galaxy in H-alpha and HaRGB

There are at least two galaxies that show wonderful intricate detail in H-alpha: NGC 300, and Barnard's Galaxy, an irregular dwarf in Sagittarius.

We photographed Barnard's Galaxy in 13 hours of H-alpha back in 2012, but there was considerable moon about.

Here, we've had another go at new moon. Even though we've only got 9.5 hours of H-alpha, it was much better.

Barnard's Galaxy is of pretty low surface brightness (14.4 mag/sq arcmin) even in full spectrum, so it is exceeding faint in H-alpha alone.

[Did someone say faint? This sounds like a job for ... superduck!]

Because it is so faint, we've had to brighten the image approximately 20,000 times over a raw half-hour sub. Consequently the fainter stars will look a bit gritty and the background blotchy. Guiding was also ratty due to intermittent cloud and paucity of good guide stars.

Despite these caveats, we've managed to bring out some pleasingly sharp detail in the hollow shells, intricate stringy knots, and even the odd intriguing horseshoe in the brighter patches of H-alpha nebulosity.

Here it is in H-alpha only.

We've added 2 hrs per channel RGB to guide the eye and give a feel for the whole galaxy.

Full size HaRGB image here

Toward the top of the galaxy, you will notice large swathes of bright blue star formation with remarkably little H-alpha. Presumably star formation in these regions is largely complete.

It is fun to compare the H-alpha tangles with the Answer in the Back of the Book, from the 2.2 metre ESO scope at La Silla.

Aspen CG16M on 20 inch PlaneWave. 0.55 sec arc per pixel. South probably up.

Very best,
Mike and Trish
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Click for full-size image (Barnard's Galaxy 2018 Ha 9p5 RGB 2hrs each Thumb.jpg)
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Last edited by Placidus; 19-05-2018 at 04:21 PM.
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Old 19-05-2018, 12:23 PM
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Atmos (Colin)
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You've managed some really nice detail in this faint galaxy. I photographed it maybe two years ago not having any idea what it was, only put in 2 hours or something and your image made mine look like a noisy gritty scant star halo

It is good to compare against the big professional scopes at times to see how we're going. In your case, you've not missed much at all

As an aside, there is a lot of IFN in the area too.
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Old 19-05-2018, 04:54 PM
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Those Outer Ha regions look good!
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Old 19-05-2018, 05:21 PM
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billdan (Bill)
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That came out really good M&T, you can tell its really faint, I'm surprised its got a lot of blue stars, must be still star generating.

Cheers
Bill
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Old 19-05-2018, 05:59 PM
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Geoff45 (Geoff)
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You guys are really churning out images. This is a good one of a difficult object. It's my nemesis. Every time I try to photograph it something goes wrong (heavy dew, computer failure, guding goes pear shaped etc, etc)
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Old 19-05-2018, 06:38 PM
Placidus (Mike and Trish)
Narrowing the band

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Quote:
Originally Posted by Atmos View Post
You've managed some really nice detail in this faint galaxy. I photographed it maybe two years ago not having any idea what it was, only put in 2 hours or something and your image made mine look like a noisy gritty scant star halo

It is good to compare against the big professional scopes at times to see how we're going. In your case, you've not missed much at all

As an aside, there is a lot of IFN in the area too.
Thanks, Colin. We'd probably need a much wider field and Fred-like exposure to see the IFN, but what we found was fun.

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Originally Posted by Bart View Post
Those Outer Ha regions look good!
Thanks Bart!

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Originally Posted by billdan View Post
That came out really good M&T, you can tell its really faint, I'm surprised its got a lot of blue stars, must be still star generating.

Cheers
Bill
Aye, Bill, as you say it must have been generating hot new stars until very recently, and it probably still is where there's lots of Ha, but in those upper regions, it's probably just about stopped now as there seems to be no new gas to craft them from.

Quote:
Originally Posted by Geoff45 View Post
You guys are really churning out images. This is a good one of a difficult object. It's my nemesis. Every time I try to photograph it something goes wrong (heavy dew, computer failure, guding goes pear shaped etc, etc)
Hi, Geoff. Hope you get a Gremlin-free crack at it in the future.

Best,
Mike and Trish
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Old 19-05-2018, 06:46 PM
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Nice work Guy's
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Old 19-05-2018, 07:49 PM
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multiweb (Marc)
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Beaute shot. Reminiscent of the LMC.
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Old 19-05-2018, 08:59 PM
Placidus (Mike and Trish)
Narrowing the band

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Nice work Guy's
Cheers, Louie!

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Beaute shot. Reminiscent of the LMC.
Thanks Marc. We shall call it the third Magellanic Cloud.
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Old 19-05-2018, 09:41 PM
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Atmos (Colin)
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You don’t need much exposure and looking at my 1.8 hours with a 5”, some of that IFN is in your field.
1.8 hours of data
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Old 19-05-2018, 09:59 PM
Placidus (Mike and Trish)
Narrowing the band

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You don’t need much exposure and looking at my 1.8 hours with a 5”, some of that IFN is in your field.
1.8 hours of data
Wow! Yes, there it is. Lovely photo.
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Old 19-05-2018, 10:20 PM
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What a great project MnT! Looks like a miniature version of the LMC with the Ha globules spread around. Thanks for an informative write up as well. I suspect that the ESO will start using your images as a benchmark :-)
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Old 20-05-2018, 05:57 AM
Placidus (Mike and Trish)
Narrowing the band

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What a great project MnT! Looks like a miniature version of the LMC with the Ha globules spread around. Thanks for an informative write up as well. I suspect that the ESO will start using your images as a benchmark :-)
Thanks Rodney, and congratulations on your AAPOD

Last edited by Placidus; 20-05-2018 at 12:50 PM.
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Old 20-05-2018, 07:26 AM
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A terrific image. Those Ha areas look a lot like some in the LMC.

Great work.

Greg.
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Old 20-05-2018, 08:01 AM
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SimmoW (SIMON)
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Wow that's different! And an intense feel, good one Team
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Old 20-05-2018, 11:19 AM
markas (Mark)
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Terrific Image! Those Ha bubbles really pop1 (No pun intended)


Mark
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Old 20-05-2018, 11:30 AM
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codemonkey (Lee)
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Congrats guys. This looks like a tough one, undoubtedly even more so given your imaging scale. Looks like too much of a challenge for me!
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Old 20-05-2018, 06:19 PM
Placidus (Mike and Trish)
Narrowing the band

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Quote:
Originally Posted by gregbradley View Post
A terrific image. Those Ha areas look a lot like some in the LMC.

Great work.

Greg.
Thanks Greg! Yes, it really is the Third Magellanic Cloud.

Quote:
Originally Posted by SimmoW View Post
Wow that's different! And an intense feel, good one Team
Cheers, Simmo.

Quote:
Originally Posted by markas View Post
Terrific Image! Those Ha bubbles really pop1 (No pun intended)

Mark
Thanks Mark, we'll pop open the Champagne.

Quote:
Originally Posted by codemonkey View Post
Congrats guys. This looks like a tough one, undoubtedly even more so given your imaging scale. Looks like too much of a challenge for me!
Thank you Lee. Our previous attempt at it was ok in the really bright bits, but the background was so moth-eaten there was no point including the 2012 data along with this lot.
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Old 21-05-2018, 08:45 PM
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RickS (Rick)
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Looks great, M&T! I love the little red bubbles and the contrasting star colours.

Cheers,
Rick.
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Old 22-05-2018, 05:32 PM
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It's a deep look at this galaxy MnT. Colour is nice and vibrant. It's also quite close to an independent discovery of an object I made last year. It might be worth targeting that huge scope on Patchick 161.
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