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

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Discussion Overview

The discussion revolves around the identification and naming of the Bullet Cluster, specifically the designations 1E0657-56 and 1E0657-558. Participants explore whether these references denote the same astronomical object and the implications of differing nomenclature in scientific databases.

Discussion Character

  • Debate/contested

Main Points Raised

  • Some participants question whether 1E0657-56 and 1E0657-558 refer to the same Bullet Cluster, with one participant noting that NED provides information for 1E0657-56 but not for 1E0657-558.
  • Another participant suggests that the correct designation is 1ES 0657-558, which may explain the difficulty in finding information on it.
  • One reply asserts that both designations refer to the same cluster, although this claim is not universally accepted.
  • Concerns are raised about the lack of cross-references in databases for 1E0657-558, leading to speculation that it could be a new name or a typographical error.
  • A participant draws a parallel to biological nomenclature, describing the confusion in naming conventions as similar to 'nomen confusum' in biology.

Areas of Agreement / Disagreement

Participants do not reach a consensus on whether 1E0657-56 and 1E0657-558 refer to the same object, with multiple competing views and uncertainty about the correct designation.

Contextual Notes

The discussion highlights limitations in the availability of information in databases and the potential for confusion in naming conventions, but does not resolve these issues.

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The Bullet Cluster is referenced as 1E0657-56; but sometimes references quote 1E0657-558. Are they both referring to the same Bullet Cluster?
 
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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?
 
@phyzguy, it's 1ES 0657-558. That's why you can't find it.
 
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So the answer to the OP's question is yes, 1E0657-56, and 1ES 0657-558 both refer to the same cluster.
 
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phyzguy said:
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.
 
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.
 
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