Table · dataset · 1997
Study of fine-structure constants
Listed in IVOA Registry (Virtual Observatory)
A statistical analysis of fine splitting of C IV, N V, O VI, Mg II, Al III and Si IV doublet absorption lines in quasar spectra is carried out in order to estimate a possible time variation of the fine-structure constant {alpha}= e^2^(h/2{pi})c (~1/137) over cosmological time scales t~10^10^yr.
Description
The observational basis of the analysis is a catalogue of 1414 pairs of wavelengths with redshifts z = 0.2 - 3.7, compiled from data published in 1980-1992.
Robust statistical estimates like the ``trimmed mean'' are used as well as the least squares. No statistically significant time variation of {alpha} is found. The estimate {alpha}^-1^d{alpha}/dz = (-0.6+/-2.8)10^-4^ is obtained.
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For the 95% significance level, an upper bound on the rate of a relative variation of the fine-structure constant is |{alpha}^-1^d{alpha}/dz| < 5.6x10^-4^, which corresponds approximately to |{alpha}^-1^d{alpha}/dt| < 4x10^-14^ yr^-1^. This limit represents the strongest up-to-date restriction on the possible time variation of {alpha} for the epoch 0.2 <= z <~ 4.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/104/89 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 1994A&AS..104...89P ui.adsabs.harvard.edu/abs/1994A%26AS..104...89P ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/a%2Bas/104/89 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 7 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+as/104/89 | 14 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |