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NGC 3938 and NGC 4013 Galaxies in Ursa Major

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#1 Jim Thommes

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Posted 14 July 2020 - 06:04 PM

NGC 3938 is the main object in this field. It is a classic face-on spiral - SA(s)c. It's distance is somewhat vague for such a prominent galaxy. Early Tully-Fisher (redshift independent) measurements places it 18-19 million light years distant; a later Tully-Fisher place it at about 55 million light years; more current estimates (SNII optical) place it at about 71 million light years. Redshift distance measurement  places it at about 48 million light years. I showed the 71 mly redshift independent estimate and the 48 mly redshift estimate in my annotation.

 

Also captured in this image the galaxy NGC 4013 - classified "Sb edge-on". Its distance estimate (by Tully-Fisher and redshift) are more consistent and range from about 49 to 58 million light years. Arp 62 (APG 62) is also seen. It is a distorted galaxy pair with an estimated distance of about 240 to 280 million light years. A better image scale would do a better job on this object. There are a number of background galaxies and Quasars (I annotated the brighter ones). The full size image shows these best. The furthest Quasar that is still reasonably visible in the image has a redshift of 2.205.

 

Image and details can be accessed at the link below (or by clicking on the NGC 3938 thumbnail image); full size image can be accessed from the image webpage and has an image scale of 1.76 arcsec/pixel. The annotated image link is provided below, but that can also be accessed from the image webpage.

 

 

NGC3938_MN152_PI1_PS2_Crp_small.jpg

 

NGC 3938 and NGC 4013

 

 

Annotated Image:
NGC 3938 and NGC 4013 Annotated

 

Scope: Explore Scientific MN152 at f/4.8
Camera: ST8300M (Baader LRGB filters)
Location: DAA Observatory, Shelter Valley, CA


  • Gregory, noodle, psandelle and 21 others like this

#2 SeymoreStars

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Posted 14 July 2020 - 06:16 PM

Very nice Jim, not many examples of this on ABin. Great annotation too, thanks.



#3 Astroman007

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Posted 14 July 2020 - 06:46 PM

Great commentary, good image! 

 

Thank you for sharing. waytogo.gif



#4 sunnyday

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Posted 14 July 2020 - 08:37 PM

nice take and description , thanks .



#5 elmiko

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Posted 15 July 2020 - 10:27 PM

Excellent image Jim!



#6 PeteM

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Posted 15 July 2020 - 10:43 PM

Very interesting pair in Ursa Major that I have not heard much about in the past. Thanks for going after it and sharing.



#7 Jim Thommes

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Posted 16 July 2020 - 05:38 PM

Thanks for the comments folks.

 

 

Very interesting pair in Ursa Major that I have not heard much about in the past. Thanks for going after it and sharing.

Thanks Pete. I think NGC3938 has gotten a little more attention since there have been four observed Super Novas since 1961. The last two were 2005 and 2017.



#8 Michael Deger

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Posted 18 July 2020 - 09:45 AM

Hi Jim,

 

excellent image of this nice pair of galaxies.

 

Best regards

Michael



#9 Jim Thommes

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Posted 19 July 2020 - 05:22 PM

Hi Jim,

 

excellent image of this nice pair of galaxies.

 

Best regards

Michael

Thanks Michael.



#10 lynnelkriver

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Posted 19 July 2020 - 06:16 PM

Really nice Jim!  Scott




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