Free Access
Table 2
Hydrogen column density comparison.
| Source | N(H) | 21 cm | 21 cm | 21 cm | |||||
| surveya | surveyb | surveyc | |||||||
|
|
|||||||||
| 4U 0614+091 | 9.30 ± 0.68 | 5.42 | 4.42 | 5.86 | |||||
| 4U 0918–54 | <1.53 | 7.34 | 6.19 | 7.63 | |||||
| 4U 1254–69 | 2.23 ± 0.23 | 2.85 | 2.15 | 3.46 | |||||
| 4U 1636–53 | 5.59 ± 1.71 | 3.30 | 2.64 | 4.04 | |||||
| 4U 1728–16 | 6.63 ± 0.43 | 2.10 | 1.98 | 3.31 | |||||
| 4U 1735–44 | 3.17 ± 1.29 | 3.03 | 2.56 | 3.96 | |||||
| 4U 1820–30 | 2.41 ± 0.76 | 1.52 | 1.32 | 2.33 | |||||
| 4U 1915–05 | 4.72 ± 1.97 | 2.55 | 2.31 | 3.72 | |||||
| 4U 1957+11 | 3.44 ± 1.74 | 1.31 | 1.23 | 2.01 | |||||
| Aql X–1 | 3.64 ± 0.28 | 3.28 | 2.86 | 4.30 | |||||
| Cygnus X–1 | 9.71 ± 0.42 | 8.10 | 7.81 | 9.25 | |||||
| Cygnus X–2 | 4.28 ± 0.42 | 2.20 | 1.88 | 3.09 | |||||
| EXO 0748–676 | <2.47 | 2.03 | 1.87 | 3.21 | |||||
| GRO J1655–40 | 7.84 ± 0.29 | 6.84 | 5.78 | 7.22 | |||||
| GS 1826–238 | 3.05 ± 0.33 | 1.83 | 1.68 | 3.00 | |||||
| GX 339–4 | 4.09 ± 0.53 | 5.00 | 3.74 | 5.18 | |||||
| GX 349+2 | 14.31 ± 3.29 | 6.12 | 4.69 | 6.13 | |||||
| GX 9+9 | 7.40 ± 0.67 | 2.10 | 1.98 | 3.31 | |||||
| J1753.5–0127 | 0.01 ± 0.26 | 1.64 | 1.66 | 2.98 | |||||
| Swift J1808-3658 | 2.20 ± 1.25 | 0.27 | 0.26 | 0.29 | |||||
| Swift J1910.2-0546 | 7.41 ± 1.18 | 2.24 | 2.44 | 2.24 | |||||
| Sco X–1 | 2.14 ± 1.45 | 1.47 | 1.40 | 2.54 | |||||
| Ser X–1 | 2.98 ± 0.87 | 4.43 | 3.98 | 5.42 | |||||
| XTE J1817-330 | 1.37 ± 0.39 | 1.58 | 1.39 | 2.29 | |||||
Notes. N(H) in units of 1021 cm-2. and
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.