| Issue |
A&A
Volume 614, June 2018
|
|
|---|---|---|
| Article Number | C1 | |
| Number of page(s) | 5 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361/201629684e | |
| Published online | 06 June 2018 | |
The extragalactic background light revisited and the cosmic photon–photon opacity (Corrigendum)
University of Padova, Physics and Astronomy Department,
Vicolo Osservatorio 3,
35122
Padova, Italy
e-mail: alberto.franceschini@unipd.it
Received:
29
March
2018
Accepted:
29
March
2018
Key words: cosmic background radiation / diffuse radiation / gamma rays: galaxies / BL Lacertae objects: general / errata, addenda
For some unexplained reasons, all tables in the Franceschini & Rodighiero (2017) paper have been mixed up. Tables 1–3 reported there were identical to those published in Franceschini et al. (2008). We report here in Tables 1, 2, and 4 the corresponding correct values in terms of photon proper number densities and photon–photon optical depths as a function of photon energy.
We also took this occasion to add a new table (Table 3) including the predicted extragalactic background light values at redshifts between 2 and 3.5, as requested by some readers of the Franceschini & Rodighiero (2017) paper.
Both photon number densities and photon–photon optical depths are calculated including the contributions of the cosmic microwave background assumed as a black-body with T = 2.728 K. Except for the numerical values in the tables, all the rest of the Franceschini & Rodighiero (2017) paper is unaffected by the problem.
Photon proper number density as a function of redshift (1).
Photon proper number density as a function of redshift (2).
Photon proper number density as a function of redshift (3).
Photon–photon optical depth as a function of energy and redshift.
Acknowledgements
We thank Jonathan Biteau, Barbara Biasuzzi, and Christoph Wendel for useful comments and criticisms.
References
- Franceschini, A., & Rodighiero, G. 2017, A&A 603, A34 [NASA ADS] [CrossRef] [EDP Sciences] [Google Scholar]
- Franceschini, A., Rodighiero, G., & Vaccari, M. 2008, A&A, 487, 837 [NASA ADS] [CrossRef] [EDP Sciences] [Google Scholar]
© ESO 2018
All Tables
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