Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Interacting galaxies in Sextans - NGC 3169, NGC 3166, and NGC 3165

  • Please log in to reply
12 replies to this topic

#1 Terry R

Terry R

    Messenger

  • -----
  • topic starter
  • Posts: 496
  • Joined: 31 Jan 2013
  • Loc: Australia

Posted 24 March 2019 - 04:55 AM

The image presented spans about 30 arc minutes side to side.  To give some perspective or scale to the image, it would take light 600,000 years to travel across the space shown in the photo at the group's estimated distance of 70 million light-years.  The three galaxies presented are embedded within an extended ring of neutral hydrogen, with its centre on NGC 3169 (left).  In time, these galaxies will merge to form a single galaxy.

 

As these galaxies begin to merge, we can see signs that they are starting to be pulled apart. The faint wisps surrounding NGC 3169 are its outer spiral arms being pulled off, and lots of luminous gas has been drawn out from its disk. This gravitational tug of war has also fragmented the dust lanes in its companion NGC 3166.

 

NGC 3169 (left) is an unbarred spiral galaxy.  Its arms are worth a second look as they are extremely tightly wound about its core, and the effects of gravity pulling then outwards have resulted in an unusual look.  In addition, this interaction has helped to create a crazily extended halo of sorts.  Several hydrogen-rich areas can be identified by their reddish colouration.  It is believed that a burst of star formation took place in its nucleus roughly one billion years ago.

 

An interesting note is that supernova (SN) activity has been captured two times in NGC 3169 fairly recently.  There are two types of SN: Type I and Type II. Type I does not show hydrogen in the spectra, whereas, Type II supernovae do show hydrogen in their spectra. Type II, occur as explosions of massive stars (more than 8 times the mass of our Sun).  In 1984, a Type II-L SN 1984E was discovered in NGC 3169 (left), and in 2003, a second SN, designated SN 2003cg, was discovered; a Type 1a SN.

 

The second of the larger galaxies NGC 3166 (centre) is estimated to be around 160,000 lightyears from NGC 3169.  It has a very small, and very bright nucleus within a short smooth bar (0.5' x 0.14').  Several dark vanes can be is seen running outwards from the core.  The close proximity of the two larger galaxies is creating a gravitational distortion that has warped the disk of 3166.

 

NGC 3165 is a small and dim Spiral Galaxy that is also a member of the group.

 

Frame Size: 29.9 x 20 arcmin
Radius: 0.300 deg

 

Exposure Details:

  • Lum 69 X 900  Bin 1
  • Red 16 X 450 Bin 2
  • Green 16 X 450 Bin 2
  • Blue 24 X 450  Bin 2
  • Ha 13 X 1800 Bin 1  

      Total time  30.75 hours

 

Instruments Used:

  • 10 Inch RCOS fl 9.1
  • Astro Physics AP-900 Mount
  • SBIG STL 11000m
  • FLI Filter Wheel
  • Astrodon Lum, Red, Green, Blue Filters
  • Baader Planetarium H-alpha 7nm Narrowband-Filter

 

Software Used

  • CCDStack (calibration, alignment, data rejection, stacking)
  • Photoshop CS 6 (Image processing)

 

Thanks for looking

 

Astrobin:

get.jpg?insecure

 

Flickr:

40488702513_68d9636df0_z.jpg


Edited by Terry R, 24 March 2019 - 04:59 AM.

  • PrestonE, astrovienna, Scott Mitchell and 17 others like this

#2 alvarete

alvarete

    Mariner 2

  • *****
  • Posts: 289
  • Joined: 14 Oct 2010

Posted 24 March 2019 - 05:03 AM

Impressive work Terry. Thanks a lot for the info privided. It puts such images into correct perspective. Txs for sharing

#3 Terry R

Terry R

    Messenger

  • -----
  • topic starter
  • Posts: 496
  • Joined: 31 Jan 2013
  • Loc: Australia

Posted 24 March 2019 - 05:05 AM

Impressive work Terry. Thanks a lot for the info privided. It puts such images into correct perspective. Txs for sharing

My pleasure :)



#4 TOMDEY

TOMDEY

    Gemini

  • -----
  • Posts: 3297
  • Joined: 10 Feb 2014
  • Loc: Springwater, NY

Posted 24 March 2019 - 05:25 AM

Superb!    Tom



#5 elmiko

elmiko

    Surveyor 1

  • -----
  • Posts: 1965
  • Joined: 27 Jul 2009
  • Loc: Arizona

Posted 24 March 2019 - 09:07 AM

Just an amazing image Terry! Clarity of this image couldn't get any better. Your images are perhaps the best I have seen on any astro forum. They rival Hubble images. Gives me something to strive for.

Mike



#6 Mert

Mert

    Fly Me to the Moon

  • *****
  • Posts: 5734
  • Joined: 31 Aug 2005
  • Loc: Spain, Pamplona

Posted 24 March 2019 - 09:26 AM

Congratulations Terry on a terrific image!

What strikes me is the wealth of background information

you have shared which makes looking to your image even

more interesting.

Great work, all respect!!



#7 jhayes_tucson

jhayes_tucson

    Fly Me to the Moon

  • *****
  • Posts: 6704
  • Joined: 26 Aug 2012
  • Loc: Bend, OR

Posted 24 March 2019 - 10:01 AM

That's outstanding Terry!  Very well done mate!

 

John



#8 javier_gl

javier_gl

    Sputnik

  • -----
  • Posts: 38
  • Joined: 23 Mar 2011

Posted 24 March 2019 - 02:22 PM

Awesome!  Congratulations Terry.



#9 Andreas_Roerig

Andreas_Roerig

    Vostok 1

  • -----
  • Posts: 144
  • Joined: 25 Jun 2012
  • Loc: Westerwald / Germany

Posted 24 March 2019 - 04:50 PM

Outstanding image  Terry!

 

Andreas



#10 Terry R

Terry R

    Messenger

  • -----
  • topic starter
  • Posts: 496
  • Joined: 31 Jan 2013
  • Loc: Australia

Posted 24 March 2019 - 05:31 PM

Superb!    Tom

Thanks Tom

 

Just an amazing image Terry! Clarity of this image couldn't get any better. Your images are perhaps the best I have seen on any astro forum. They rival Hubble images. Gives me something to strive for.

Mike

Thanks for the great feedback.  I ordered my orbital imaging platform, but it never arrived :(  

 

Congratulations Terry on a terrific image!

What strikes me is the wealth of background information

you have shared which makes looking to your image even

more interesting.

Great work, all respect!!

Thanks Mert.  All these funky looking galaxies seem to have an interesting story to share. 


  • elmiko likes this

#11 Terry R

Terry R

    Messenger

  • -----
  • topic starter
  • Posts: 496
  • Joined: 31 Jan 2013
  • Loc: Australia

Posted 24 March 2019 - 05:33 PM

That's outstanding Terry!  Very well done mate!

 

John

Thanks John waytogo.gif

 

Awesome!  Congratulations Terry.

Thank you javier.

 

Outstanding image  Terry!

 

Andreas

Many thanks Andreas



#12 44maurer

44maurer

    Mariner 2

  • *****
  • Posts: 239
  • Joined: 12 Jun 2016
  • Loc: Los Angeles, CA

Posted 24 March 2019 - 11:44 PM

Incredible!

#13 Terry R

Terry R

    Messenger

  • -----
  • topic starter
  • Posts: 496
  • Joined: 31 Jan 2013
  • Loc: Australia

Posted 25 March 2019 - 12:24 AM

Incredible!

Thanks Brian




CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics