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Getting plate-solving status, please wait...

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

Technical card

Resolution: 4000x4000

Dates:Sept. 14, 2018Sept. 17, 2018

Frames:
Astrodon LRGB Tru-Balance E-series Gen II: 14x600" -30C bin 1x1
Astronomik LRGB 1,25": 16x300" -30C bin 2x2

Integration: 3.7 hours

Darks: ~11

Flats: ~12

Bias: ~20

Avg. Moon age: 6.45 days

Avg. Moon phase: 40.62%

Bortle Dark-Sky Scale: 1.00

Astrometry.net job: 2287976

RA center: 9.420 degrees

DEC center: -33.715 degrees

Pixel scale: 0.206 arcsec/pixel

Orientation: 209.178 degrees

Field radius: 0.162 degrees

Locations: Chilescope, Fundina, Chile

Data source: Amateur hosting facility

Remote source: ChileScope

Description

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.

Comments

Author

Jean-Baptiste_Paris
Jean-Baptiste Auroux
License: None (All rights reserved)
116917
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Revisions

D

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

E

Crop version (full size)

F

full V2 - fdc corrigé - improved backgroun

G

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

H

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.

I

full final version

J

Croped final version

K

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

L

Saturation correction.

M

AAPOD² celebration (28/12/2018) ! ;)

Sky plot

Sky plot

Histogram

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





    
        

            Jean-Baptiste Auroux