What Does MUV Mean in Astronomy? Understanding GN-z11 and its Redshift

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    Galaxy Research paper
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Discussion Overview

The discussion centers on understanding the term MUV in the context of the galaxy GN-z11, particularly its absolute magnitude in the ultraviolet spectrum and its associated redshift value. Participants explore the implications of these terms in astronomy.

Discussion Character

  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant seeks clarification on the meaning of MUV and the naming convention of GN-z11.
  • Another participant proposes that MUV refers to the absolute magnitude in the ultraviolet (UV) spectrum, though expresses uncertainty.
  • A subsequent participant confirms the interpretation of MUV as absolute magnitude in UV and connects it to brightness.
  • Another participant provides a definition of the naming convention for GN-z11, citing its location and redshift.
  • A question is raised regarding the significance of the negative value of MUV.
  • A participant explains that a more negative magnitude indicates a brighter object, referencing external material for clarification.

Areas of Agreement / Disagreement

Participants generally agree on the interpretation of MUV as absolute magnitude in UV, but there is some uncertainty regarding the implications of the negative value and the naming convention of GN-z11.

Contextual Notes

Some assumptions about the definitions of magnitude and redshift may not be fully articulated, and the discussion does not resolve the implications of the negative magnitude value.

Phys12
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I was going through the following paper: https://arxiv.org/pdf/1605.08054.pdf

In the 2nd line, it says, "GN-z11, a MUV=-21.1 galaxy at z=11.1."

I know, what z=11.1 is. If I'm correct, it's the redshift of the galaxy which helps in measuring its velocity.

I'm not quite sure, though, of what MUV is or why the galaxy is named GN-z11. Any help will be highly appreciated. Thanks.
 
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I think it's the absolute magnitude in UV for the galaxy, but I'm not certain.
 
Drakkith said:
I think it's the absolute magnitude in UV for the galaxy, but I'm not certain.
Absolute magnitude as in brightness?
 
That's right.
 
Drakkith is right that MUV is the absolute magnitude in the UV,. As for the name, Wikipedia says,
"The object's name is derived from its location in the GOODS-North field of galaxies and its high Doppler z-scale redshift number (GN + z11)"
 
All right, though, why is the value negative?
 

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