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Table 2

Selection of previous studies employing X-ray observations to derive NH/AV in star-forming regions or the diffuse ISM of the Milky Way.

Target region NH/AV Number of Comments Reference
[cm-2 mag-1] data points
Diffuse ISM 2.2 × 1021 <638 a X-ray absorption towards supernova remnants Watson (2011)
1.8 × 1021 29 X-ray scattering halos around point sources Predehl & Schmitt (1995)
and supernova remnants
2.2 × 1021 7 X-ray absorption towards diffuse sources Gorenstein (1975)
2.2 × 1021 5 X-ray absorption towards supernova remnants Ryter et al. (1975) b
L1641 0.8 × 1021 211 includes 133 Class III YSOs Pillitteri et al. (2013) c
IRAS 20050+2720 1.2 × 1021 21 includes 10 Class III YSOs Günther et al. (2012)
NGC 1333 1.0 × 1021 26 includes 7 Class III YSOs Winston et al. (2010)
Serpens 0.7 × 1021 <60 d includes <21d Class III YSOs Winston et al. (2007)
ρ Oph 1.5 × 1021 22 sample consists entirely of Class III YSOs Vuong et al. (2003)
RCW 38 1.7 × 1021 43 includes 16 Class III YSOs Winston et al. (2011)
RCW 108 2.0 × 1021 117 Class III YSOs not discussed separately Wolk et al. (2008)
ONC 1.4 × 1021 239 includes 70 Class III YSOs this work

Notes.

(a)

The authors do not report the number of data points used in their analysis, but state that they included 638 Gamma-ray bursts in their sample, while the data quality for “a significant fraction” of objects is not sufficient to derive column densities.

(b)

The listed NH/AV ratio has been calculated from the NH/E(B − V) value reported in the paper by assuming RV = 3.1.

(c)

The listed NH/AV ratio has been calculated from the NH/AK value reported in the paper by assuming AK/AV = 0.11 as given by Cardelli et al. (1989) for RV = 3.1.

(d)

The authors do not report the number of data points used in their analysis, therefore the stated number includes sources with insufficient X-ray counts for the derivation of column densities.

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