The Bullet Cluster: 1E0657-56 vs. 1E0657-558

[Ranku]

The Bullet Cluster is referenced as 1E0657-56; but sometimes references quote 1E0657-558. Are they both referring to the same Bullet Cluster?

 

[phyzguy]

NED returns Bullet Cluster information for 1E0657-56, but is unable to find anything fro 1E0657-558. I have never seen this used. Where did you find it?

 

[Vanadium 50]

@phyzguy, it's 1ES 0657-558. That's why you can't find it.

 

[phyzguy]

So the answer to the OP's question is yes, 1E0657-56, and 1ES 0657-558 both refer to the same cluster.

 

[Ranku]

NED returns Bullet Cluster information for 1E0657-56, but is unable to find anything fro 1E0657-558. I have never seen this used. Where did you find it?

For instance it is referenced in this paper and this is the referenced paper.

 

[jim mcnamara]

FWIW the database has 20 cross-ids, and none match. So either the author of the primary article came up with a new name or it is a typo. And maybe should be added to the database(?) I do not know.

As you can tell the "taxonomy" of extragalactic objects is confusing at first glance. I'm a biologist so I'm used to this kind of taxonomic tangle. We call each one of multiple different biological binomials for the same thing, 'nomen confusum'. For a good reason.