IPAC

Home

NASA/IPAC Extragalactic Database

  • Home
  • Search Objects
    • By Name
    • Near Name or Position (Cone)
    • In Refcode
    • By Parameters
  • Literature
    • References by Author Name
    • Reference Lookup
    • Nomenclature
  • Services
    • Gravitational Wave Followup
      • Overview
      • Events
    • Ticket Status
    • Level5
      • Knowledge Base
      • Glossary
    • Classic Home Page
  • Tools
    • Coordinate Calculator
    • Extinction Calculator
    • Velocity Calculator
  • Information
    • Overview
      • News
      • Archived Release Notes
    • User Guides
      • Search Objects
      • Calculators
      • Program Interfaces
      • Database
      • Tutorials
      • Best Practices
      • Search & Retrieval FAQ
      • Scientific Calculations FAQ
      • Known Issues
      • Discontinuing Services
    • Holdings
      • Nomenclature
      • Counts
      • Graphics
      • Data Sets
    • References
      • Articles about NED
      • Brochure (pdf)
      • Cosmology Calculators
      • Extinction-Law Calculators
      • Related Sites
    • Community
      • Users Committee
      • Ambassadors
    • Team
    • Contact Us

You are here

Home » Literature » Reference Lookup

Help Reference Information

TitleConstraining blazar distances with combined Fermi and TeV data: an empirical approach
AuthorsPrandini, E.; Bonnoli, G.; Maraschi, L.; Mariotti, M.; Tavecchio, F.
Bibcode

2010MNRAS.405L..76P   Search ADS ↗

AbstractWe discuss a method to constrain the distance of blazars with unknown redshift using combined observations in the GeV and TeV regimes. We assume that the Very High Energies (VHE) spectrum corrected for the absorption through the interaction with the extragalactic background light cannot be harder than the spectrum in the Fermi/Large Area Telescope (LAT) band. Starting from the observed VHE spectral data we derive the EBL-corrected spectra as a function of the redshift z and fit them with power laws to be compared with power-law fits to the LAT data. We apply the method to all TeV blazars detected by LAT with known distance and derive an empirical law describing the relation between the upper limits and the true redshifts that can be used to estimate the distance of unknown redshift blazars. Using different EBL models leads to systematic changes in the derived upper limits. Finally, we use this relation to infer the distance of the unknown redshift blazar PKS 1424+240.
Objects

17 Objects    Search NED ↙

Reload form

The NASA/IPAC Extragalactic Database (NED) is funded by the
National Aeronautics and Space Administration under
Award Number 80NSSC21M0037, and operated by the California Institute of Technology.

  • IPAC
  • Caltech
  • NASA
  • About NED
  • Acknowledging NED
  • Connect with NED:
    • EMail
    • facebook
    • youtube
Copyright © 2025, California Institute of Technology
back up ↑