"Cartwheel Galaxy" : 500 million LY away... (RC1m) (Jean-Baptiste Auroux)

"Cartwheel Galaxy" : 500 million LY away... (RC1m)

Link: http://www.aapodx2.com/2018/20181228.html

AAPOD² du 28 décembre 2018!

La réalisation d'un rêve d'enfant : photographier la "galaxie de la roue de charrette" (ESO350-40) dans la constellation du Sculpteur !

Bien connue sous la version du HST, mais peu imagée au niveau amateur… à 500 millions d'années-lumière, elle est en effet de très petite taille apparente (1,1' x 0,9'). Il m'aura fallu recourir au RC de 1m de Chilescope et ses 6,7m de focale pour cette image ; et ça reste petit…

A cette distance de 500 millions d'années-lumière, son Redshift est de 0,03, soit une vitesse d'éloignement de 10.000 km par seconde !

Cette galaxie est exceptionnelle de par sa structure annulaire : il s'agit d'une ancienne galaxie spirale qui a été traversée par une autre galaxie plus petite (sans doute l'une des deux petites galaxies à proximité immédiate) et dont l'onde de choc a généré la création d'étoiles jeunes (bleues) dans la couronne exterieure.

RC 1m en remote au Chili (www.chilescope.com).

Bonus : essai de simulation de la création de la structure annulaire de la galaxie : en vidéo.

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A kid's dream for me : to photograph the "Cartwheel Galaxy" (aka ESO350-40) in Sculptor.

The most famous version is the one made by the HST, but it's a very rare object for amateurs because of its distance (500 million LY away) and its apparent size (1,1' x 0,9'). Even with the Chilescope's 1m RC (and its 6,7m of focal lenght), it is still a little target !

Its Redshift is 0,03, which corresponds to a recessional Velocity of 10.000 km/s !

The galaxy was once a normal spiral galaxy before it apparently underwent a head-on collision with a smaller companion (probably one of the little galaxies just around on the image). When the nearby galaxy passed through the Cartwheel Galaxy, the force of the collision caused a powerful and high speed shock wave through the galaxy, which created a starburst and the bluish ring around the galaxy.

1m RC in remote (Chilescope).

Bonus : a simulation of the creation of the annular structure of the galaxy : video here.

D

Description: Petite comparaison des dimensions apparentes respectives des galaxies M33, M83, et ESO35-40
Comparison of the respective apparent angular size of galaxies M33, M83 and ESO350-40

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E

Description: Crop version (full size)

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F

Description: full V2 - fdc corrigé - improved backgroun

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G

Description: Annotated version - AB seems to not be able to plate-solve the image...

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H

Description: Comparatif avec les 2 images réalisées par le HST pour confirmer les détails sur mon image - Comparison with the 2 images made by HST in order to confirm details in my image.

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I

Description: full final version

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J

Description: Croped final version

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K

Description: An "intermediate crop" version, in order to better see the galaxy, but with more field than the cropped version.

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L

Description: Saturation correction.

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M

Description: AAPOD² celebration (28/12/2018) ! ;)

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Description: We see more and more comparisons made between amateur photos and the James Webb Telescope photos... but often, the differences are a bit "erased" by reducing the size of the JWST image.
Here is a realistic comparison between the superb JWST image of the galaxy ESO350-40, and my own image taken with a 1m diameter telescope in Chile (which is already not a small telescope...) : one can see the huge difference between the two images, in terms of signal and resolution !
The 2 images are here in full 100% version (before reduction of the whole for the left picture). And to make it even more telling, it's even better to leave the JWST image at 100% like on the image to really appreciate the level of details !

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