| 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 | |
H I filaments are cold and associated with dark molecular gas
HI4PI-based estimates of the local diffuse CO-dark H2 distribution (Corrigendum)★
1
Argelander-Institut für Astronomie,
Auf dem Hügel 71,
53121
Bonn,
Germany
e-mail: pkalberla@astro.uni-bonn.de
2
Tartu Observatory, University of Tartu,
61602
Tõravere,
Tartumaa,
Estonia
Key words: ISM: clouds / ISM: structure / ISM: molecules / dust, extinction / errata, addenda
Corrected FITS files are available at the CDS via anonymous ftp to cdsarc.cds.unistra.fr (130.79.128.5) or via https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/639/A26
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).
 |
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
- Kalberla, P. M. W., Kerp, J., & Haud, U. 2020a, A&A, 639, A26 [EDP Sciences] [Google Scholar]
- Kalberla, P. M. W., Kerp, J., & Haud, U. 2020b, VizieR Online Data Catalog: J/A+A/639/A26 [Google Scholar]
- Skalidis, R., Goldsmith, P. F., Hopkins, P. F., et al. 2024, A&A, 682, A161 [NASA ADS] [CrossRef] [EDP Sciences] [Google Scholar]
© The Authors 2024
Open 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.
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All Figures
|
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 | |
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