Open Access
Erratum
This article is an erratum for:
[https://doi.org/10.1051/0004-6361/202037602]


Issue
A&A
Volume 684, April 2024
Article Number C1
Number of page(s) 1
Section Interstellar and circumstellar matter
DOI https://doi.org/10.1051/0004-6361/202449494e
Published online 01 April 2024

All calculations in Kalberla et al. (2020a) were done in terms of hydrogen nucleon column densities, NH. However, when producing the output FITS maps for H2 column densities, the conversion to molecular column densities, NH2 = NH/2, was neglected. In Fig. 11 the range of the displayed values 15.1 < log(NH2/cm−2) < 21.8 is incorrect, whereas 14.8 < log(NH2/cm−2) < 21.5 is correct. The online FITS datasets NH2_v90.fit, NH2t_v90.fit, and NH2_v08.fit (Kalberla et al. 2020b) are also affected. None of the conclusions of the paper are affected by the conversion error.

We thank Rafail Skalidis for pointing out discrepancies in derived NH2 column density distributions (Skalidis et al. 2024, Sect. 4.2.3). Using their Eq. (8) with a correct scaling, the differences ∆(log NH2)~ −0.5, demonstrated in their Fig. 8, reduce to ∆(log NH2) ~ −0.2. These remaining differences are explainable by different XCO conversion factors, which are used in both papers. With XCO = 2 × 1020 cm−2 (K km s−1)−1, as used by Skalidis et al. (2024), the differences reduce further, leading to a perfect consistent Gaussian distribution with a mean ∆(log NH2) = −0.13 and a dispersion of 0.23 (Fig. 1).

thumbnail Fig. 1

Distribution of differences ∆(log NH2) according to Skalidis et al. (2024, Eq. (8)) for three casses: blue, initial NH2 data from Kalberla et al. (2020a) with a scale error; green, scale error corrected; and red, scale error corrected and using XCO = 2 × 1020 cm−2 (K km s−1)−1.

References

  1. Kalberla, P. M. W., Kerp, J., & Haud, U. 2020a, A&A, 639, A26 [EDP Sciences] [Google Scholar]
  2. Kalberla, P. M. W., Kerp, J., & Haud, U. 2020b, VizieR Online Data Catalog: J/A+A/639/A26 [Google Scholar]
  3. Skalidis, R., Goldsmith, P. F., Hopkins, P. F., et al. 2024, A&A, 682, A161 [Google Scholar]

© The Authors 2024

Licence Creative CommonsOpen Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

This article is published in open access under the Subscribe to Open model. Subscribe to A&A to support open access publication.

All Figures

thumbnail Fig. 1

Distribution of differences ∆(log NH2) according to Skalidis et al. (2024, Eq. (8)) for three casses: blue, initial NH2 data from Kalberla et al. (2020a) with a scale error; green, scale error corrected; and red, scale error corrected and using XCO = 2 × 1020 cm−2 (K km s−1)−1.

In the text

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.