[vsnet-alert 11032] Re: re CSS090201:090210-113032 : problematic 2MASS colours

Michael Linnolt linnolt at hawaii.edu
Tue Feb 3 02:41:45 JST 2009


Need some clarification on this. Malmquist effect is a sampling error due to arbitrary lower-limit flux cutoff of the instrument (selection effect, affecting a number of observations of objects). Not really biasing any given observation to appear brighter...

Mike Linnolt 

----- Original Message -----
From: varposts at Safe-mail.net
Date: Monday, February 2, 2009 2:20 am
Subject: [vsnet-alert 11030] re CSS090201:090210-113032 : problematic 2MASS colours
To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp
> 
> Having said that, these "Malmquit Effect"-esque type errors at 
> photometric instrumentation faint limits tend to have a bias 
> towards making objects seem brighter than true, which'd of 
> course make this setup potentially redder in J-Ks than the 
> current apparent case, _if_ J has some usable level of accuracy.
> 


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