[AZ-Observing] Re: M101 for the month of May
- From: "Dan Heim" <dan@xxxxxxxxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Fri, 25 May 2007 07:44:09 -0700
Jennifer,
There are three catalogs that list galactic inclinations cited in this
interesting article:
http://eo.ucar.edu/staff/dward/sao/dward604project.pdf
I haven't looked for any of those catalogs, but I assume they're available.
I stumbled across this article when I was looking for a formula to calculate
galactic inclination based on observed major and minor axes.
Dan Heim
----- Original Message -----
From: "Jennifer Polakis" <m24@xxxxxxx>
To: <az-observing@xxxxxxxxxxxxx>
Sent: Friday, May 25, 2007 2:17 AM
Subject: [AZ-Observing] Re: M101 for the month of May
> Chris,
>
> Another highly detailed photo but do you really think 10x better than your
> previous photos with your "old" camera. Definitely 100x better than a
> Brownie!
>
> I wonder to gravitational lensing--when there is a galaxy within the
obvious
> confines of the nearer galaxy, is it _always_ magnified by the
> gravitational lens? Would a camera still pick all of them up if they
weren't
> magnified by the closer galaxy?
>
> Jimmy,
> As for the inclination of M101 it's actually 17o, and yes, all spiral
> galaxies are round. There is a set formula to determine the inclination
> based on the length and width + a few degrees for what radio telescopes
> pick up beyond that. It's a bit counter-intuitive in that 0 degrees is
> perfectly face on and 90 degrees is an edge on. The Andromeda galaxy for
> example is inclined 77+degrees.
>
> Does anyone knows where to find a list of galaxy inclinations, even a
small
> list like for the M's would be great for a comparison.
>
>
> Chris,
> ...The brightest knot in the arms to the upper right of the nuclear region
> is NGC5462, an complex blue stellar association with a rim of red hydrogen
> around its energetic core. When we add the hydrogen data to this image,
the
> galaxy dynamics that will become visible here will be simply out of this
> world....
>
> Actually NGC 5462 is to the left of the nuclear region at about 9:30 with
an
> even brighter NGC 5461 just below it closer to the nucleus.
>
> Jenn.
>
>
>
> ----- Original Message -----
> From: "Jimmy Ray" <jimmy_ray@xxxxxxx>
> To: <az-observing@xxxxxxxxxxxxx>
> Sent: Thursday, May 24, 2007 7:49 PM
> Subject: [AZ-Observing] Re: M101 for the month of May
>
>
> Hi Chris,
>
> A great shot! I have it up as my desktop picture so I can admire it for
> awhile.
> Now for the questions borne of Novice ignorance and curiousity. On your
> website there are a couple of statements that I'm pondering over:
>
> "its inclination is less than 1 degree and is face on to our line of
sight."
>
> How is this actually calculated and/or figured out? Do all spiral galaxies
> have a certain degree of "roundness" so any amount of "obliqueness" can be
> corrolated into degrees of "tilt" or other?
>
> "Hordes of faint background galaxies dot this image, most being a leaden
> yellow color, dimmed from their great distance through intergalactic
dust."
>
> Is this dust causing the "yellowing" galactic or interstellar dust
> collecting around the galaxy itself in the plane of or within the
> gravitational field of that galaxy? Or an unrelated dark nebula somewhere
> between here and there? And / or is this caused because of the general
> "dustiness" of the Universe?
> Jimmy Ray
>
>
> Subject: [AZ-Observing] M101 for the month of May
>
> HI all,
> It took all month to image this one, due to clouds,
> wind, and giving it lots of exposure time. Anyway, I
> think youll like the lastest image of the Pinwheel
> galaxy with our newer ST10xme camera. It does 10x
> better job on galaxies than the older ST8i with the
> same setup and exposures!
> http://www.schursastrophotography.com/ccdimagepages/m101-3.html
> Comments?
> Chris
> Take Care,
>
> Chris
> Astro: http://www.schursastrophotography.com
> Robotics: http://www.schursastrophotography.com/roboticsmain.html
>
>
>
>
>
> --
> See message header for info on list archives or unsubscribing, and please
> send personal replies to the author, not the list.
>
>
--
See message header for info on list archives or unsubscribing, and please
send personal replies to the author, not the list.
Other related posts:
