Observation by David Strange: Abell 1185

Uploaded by

David Strange

Observer

David Strange

Observed

2021 Mar 17 - 23:09

Uploaded

2021 Mar 18 - 11:12

Objects

Abell cluster 1185

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Constellation

Ursa Major

Field centre

RA: 11^h11^m
Dec: +28°42'
Position angle: -0°00'

Field size

0°11' × 0°09'

Equipment

Celestron 9
ASI533MC
ASIair Pro

Exposure

30x120s

Location

Salcombe Regis

Target name

Abell 1185

Title

Abell 1185

About this image

Central region of galaxy cluster Abell 1185 showing the "Guitar" - NGC3561 with tidal tails and the dwarf galaxy "Ambartsumian's Knot".

Files associated with this observation

Abell1185_20210317_dgs3.jpg (130.0 kB)

Like this image

Philip Jennings, David Basey, Manolo_Rodriguez, Callum Potter, Mike Foylan, Davide Pistritto

Comments

Philip Jennings, 2021 Mar 18 - 12:49 UTC

A spectacular image David! Is there a slight gravitational lensing effect going on here or am I going crazy? I know it can be picked up with amateur equipment for certain galactic clusters, but generally needing ridiculously long exposures and with quick Googling I can't find the effect referred to for Abell 1185, so perhaps the latter (crazy) scenario is most likely.

David Strange, 2021 Mar 18 - 16:04 UTC

No, the little knot at the south of NGC3561 is known as Ambartsumian's knot and is believed to have been ejected from the parent galaxy. Halton Arp believed that it was evidence that galaxies bud and eject new galaxies. This is more an object of interacting galaxies rather than gravitational lensing. The long plume to the north is about 325,000 light years long.

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