Re: [APML] Near and far... NGC 300 (8k x 8k)

["Philipp Salzgeber" <philipp@salzgeber.at>]

Hi Mischa,

the preview to the image is not displayed, the link should read:
http://www.astro.uni-bonn.de/~mischa/NGC300/ngc300_preview.jpg
instead of:
file:///user3/mischa/public_html/NGC300/ngc300_preview.jpg

BTW these images are really impressive. When Iook at the H-II Regions and Supernova remnants of a distant galaxy I
really wonder how "our" nebulae might look like from intergalactic space.

with greetings from Austria

Philipp Salzgeber


----- Original Message -----
From: "Mischa Schirmer" <mischa@MPA-Garching.MPG.DE>
To: <astro-photo@seds.org>
Sent: Friday, July 05, 2002 1:32 PM
Subject: [APML] Near and far... NGC 300 (8k x 8k)


> Hi,
>
> maybe you enjoy this deep wide field shot of NGC 300,
> taken with ESO's Wide Field imager at La Silla, Chile.
> I like very much the transition from the outermost fringes of
> NGC 300 (distance: 9 million light years) into deep, deep space.
> You can count apx 75,000 faint background galaxies out there.
>
> I didn't observe this target by myself, instead I downloaded the
> publicly available images from the ESO archive and run them thru
> our data reduction pipeline. Calibrating, aligning and coadding
> the 3016 single FITS files was quite a bit work, but I found the
> "Photoshop science" even harder.
>
> For this LRGB color composite I multiplied the summed H-alpha channel
> 5 times and added it to the R filter, yielding the red image.
>
> For the Luminance channel I coadded the blue, green and red channels
> and DDPed them. With the lasso tool in photoshop I selected the inner
> third of the galaxy and brought it down to lower brightness by
> adjusting the curves a little bit. I repeated this step a second time
> with the galaxy core.
> In a similar fashion I selected everything outside the galaxy and
> increased the brightness of the faint background galaxies.
>
> For the RGB layer I created and merged two RGB images. The first
> showed the color well for the galaxy without saturation, but of course
> almost none of the background objects was seen. The second image
> showed the color of the background fuzzies very well but saturated
> the inner half of the galaxy. Merging these two images (with a smooth
> transition) and combining it with the previously done Luminance
> channel gave the result.
>
> Check it out:
>
> http://www.astro.uni-bonn.de/~mischa/NGC300
>
> I think the full resolution version is well worth the long
> download time.   :)
>
> Best regards
>
> Mischa Schirmer
>
>
>
>
>
> --  APML Archives at <http://astro.umsystem.edu/apml/>  ---
>              Unsubscribe at <majordomo@seds.org>
>


--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>