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Improving NASA/IPAC Extragalactic Database Redshift Calculations
- Source :
- The Astrophysical Journal. 914:97
- Publication Year :
- 2021
- Publisher :
- American Astronomical Society, 2021.
-
Abstract
- The NASA/IPAC Extragalactic Database (NED) is an impressive tool for finding near-exhaustive information on millions of astrophysical objects. Here, we outline a small systematic error that occurs in NED because a low-redshift approximation is used when making the correction from redshifts in the heliocentric frame to the cosmic microwave background (CMB) rest frame. It means that historically NED systematically misreported the values of CMB-frame redshifts by up to $\sim10^{-3}z$ (about 0.001 at redshift of 1). This is a systematic error, and therefore the impact on applications requiring precise redshifts has the potential to be significant -- for example, a systematic redshift error of $\sim10^{-4}$ at low redshift could resolve the Hubble tension. We have consulted with the NED team and they are updating the software to remove this systematic error so these corrections are accurate at all redshifts. Here, we explain the changes and how they impact the redshift values NED currently reports.<br />7 pages, 5 figures, 1 table. Corrected the first term of equation (8)
- Subjects :
- Physics
Systematic error
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
010504 meteorology & atmospheric sciences
Database
Cosmic microwave background
Frame (networking)
Astrophysics::Instrumentation and Methods for Astrophysics
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Rest frame
computer.software_genre
01 natural sciences
Redshift
Space and Planetary Science
0103 physical sciences
010303 astronomy & astrophysics
computer
Astrophysics - Cosmology and Nongalactic Astrophysics
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 15384357 and 0004637X
- Volume :
- 914
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal
- Accession number :
- edsair.doi.dedup.....bee21c603677edcd62b04ffbf87ac2de