Published data sets for distance modulus versus redshift

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Discussion Overview

The discussion revolves around the search for published data sets that relate distance modulus to redshift, specifically over a range of redshift values from 0 to 5. Participants express challenges in combining data from various sources due to differing methodologies in estimating distance modulus.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant requests recommendations for papers or sources that provide distance modulus and redshift data over a large range.
  • Another participant suggests a paper that describes different distance measures used in cosmology, providing a link to the Hogg paper.
  • Some participants assert that discrepancies in publications may stem from incorrect analyses, emphasizing the importance of the Hogg paper for correct methodology.
  • It is noted that reliable measurements of distance modulus at redshift z=5 are lacking, with current measurements primarily available for supernovae up to about z=2.
  • A participant recommends the Union paper as a good compilation of current supernova data.
  • Another participant points to Vizier as a potential resource for data.
  • A specific data source for z versus bolometric magnitude for 1a supernovae is mentioned, although it only extends to z=1.4, and a question is raised about the need for understanding how to determine distance modulus from the provided data.

Areas of Agreement / Disagreement

Participants generally agree on the challenges of obtaining reliable distance modulus measurements at high redshifts, but there is no consensus on the best sources or methods for combining data from different publications.

Contextual Notes

Participants highlight limitations in the availability of accurate distance modulus measurements at high redshifts and the potential for errors in existing publications, but do not resolve these issues.

Who May Find This Useful

Researchers and students interested in cosmology, particularly those focusing on the relationship between distance modulus and redshift, may find this discussion relevant.

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Does anyone have a recommendation for a paper/source for data relating distance modulus and redshift data over a large range of redshift, such as 0 < z <= 5? I have found that combining data from different publications can be difficult given the variety of ways that distance modulus can be estimated/modeled.
 
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redtree said:
Does anyone have a recommendation for a paper/source for data relating distance modulus and redshift data over a large range of redshift, such as 0 < z <= 5? I have found that combining data from different publications can be difficult given the variety of ways that distance modulus can be estimated/modeled.
This is a good paper describing the different distance measures used in cosmology:
http://arxiv.org/abs/astro-ph/9905116
 
Note that a lot of the difference between different publications is that a lot of people do it wrong! Read the Hogg paper Chalnoth sent carefully - it has the correct analysis.
 
Looks like I may have misread the original post, even though the Hogg paper is excellent.

The primary difficulty is that nobody has good measurements of distance modulus out as far as z=5 (though people are trying with GRB data). The furthest is with supernovae out to about z=2 or so. The Union paper is a good compilation of the current supernova data.
 
Try Vizier - vizier.u-strasbg.fr/cgi-bin/VizieR
 
The best compilation of z vs. bolometric magnitude m is at

http://supernova.lbl.gov/Union/figures/SCPUnion2_mu_vs_z.txt

for 1a supernovae. This only goes out to z = 1.4

You can copy and drop into a spreadsheet, then reorder by ascending z. Do you need to know how to determine distance modulus from m(z)?
 

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