What Is Galaxy 'Completeness'?

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Discussion Overview

The discussion revolves around the concept of 'completeness' in the context of Luminosity Functions in astronomy, as well as inquiries about 'K-correction'. Participants seek clarification on these terms and their implications in astronomical surveys.

Discussion Character

  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant requests an explanation of 'completeness' in astronomical surveys.
  • Another participant defines 'completeness' as the accuracy of collected data in reflecting the actual distribution of sources, noting that surveys only detect objects above a certain brightness threshold.
  • The same participant emphasizes the importance of considering 'completeness' when analyzing the statistics of a sample, as it affects the understanding of detected versus undetected sources.
  • There is a separate inquiry about 'K-correction', with one participant suggesting the use of external resources for clarification.

Areas of Agreement / Disagreement

The discussion does not appear to reach a consensus on the definitions or implications of 'completeness' and 'K-correction', as participants are still seeking clarification and additional information.

Contextual Notes

Participants have not provided detailed definitions or examples of 'completeness' or 'K-correction', and there may be assumptions about prior knowledge that are not explicitly stated.

Who May Find This Useful

Individuals interested in astronomical surveys, Luminosity Functions, and related concepts in astrophysics may find this discussion relevant.

jl294
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Reading through various publications for Luminosity Functions and it mentions completeness a lot without ever explaining what it actually is. Could someone shed light on this please?

Thanks
 
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Also, what is 'K-correction'?

Cheers
 
jl294 said:
Reading through various publications for Luminosity Functions and it mentions completeness a lot without ever explaining what it actually is. Could someone shed light on this please?
'completeness' refers to how accurately collected data reflects the actual distribution of sources. Any astronomical survey will only detect the objects which are above the limiting brightness of the telescope/survey---everything dimmer, will not be seen. Therefore, anytime you're analyzing the statistics of your sample, you have to consider the 'completeness' of the survey---i.e. what types of sources (and how many) were detected, compared to what sources (and how many) weren't detected.
 

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