The Astrophysical Journal, 765:161 (2pp), 2013 March 10 C 2013.
doi:10.1088/0004-637X/765/2/161
The American Astronomical Society. All rights reserved. Printed in the U.S.A.
ERRATUM: “13 CO CORES IN TAURUS MOLECULAR CLOUD” (2012, ApJ, 760, 147) 1
Lei Qian1 , Di Li1,2,3 , and Paul F. Goldsmith4 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;
[email protected] 2 Space Science Institute, Boulder, CO, USA;
[email protected] 3 Department of Astronomy, California Institute of Technology, CA, USA 4 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA Received 2013 January 29; published 2013 February 27
Online-only material: color figures, machine-readable table Due to a numerical error, the core velocity dispersion (CVD ≡ δv 2 1/2 ) in the published paper is actually the square of itself, i.e., CVD2 = δv 2 . After correcting this error, the CVD versus L relation of Taurus (Figure 18) should be CVD (km s−1 ) = 0.3L(pc)0.5 + 0.4, in the region 0 pc L 10 pc, with a median value of 0.98 km s−1 , while that of the model data (Figure 19) should be CVD (km s−1 ) = 0.2L(pc)0.4 + 0.4, in the region 0 pc L 10 pc. The full version of Table 4 (containing 765 cores) can be found in the online version of this erratum.
Figure 18. Plot of the core velocity difference, δv vs. the apparent separation L of cores and the core velocity dispersion (CVD ≡ δv 2 1/2 ). The background is a image of the number of data points in the δv − L plane, with gray scale (density bar at the top of the figure) showing the density of points. Contours of the density distribution in this plot are also shown. The green diamonds represent the CVD in each separation bin. The CVD data points with apparent separation 0 pc L 10 pc can be fitted with a power law of CVD (km s−1 )= 0.3L(pc)0.5 + 0.4. The horizontal line shows the mean CVD value, 1.1 km s−1 , of data points with L > 10 pc. The background density distribution shows two groups of points, which are also evident by looking at the contours. These two groups define two length scales. One corresponds to the typical size of a “core cluster,” about 4 pc, while the other one shows the “core cluster” separation to be about 8 pc. (A color version of this figure is available in the online journal.)
Figure 19. Results from numerically generated sample taken from two spherical clusters of cores, each having a 7 pc radius and with a separation of 9 pc between the centers of two clusters. The same statistical treatment as that applied to the actual data (Figure 18) has been employed. The two length scales, i.e., the size of a core cluster, and the separation of the clusters are clearly seen. The CVD data points with apparent separation 0 pc L 10 pc can be fitted with a power law of CVD (km s−1 ) = 0.2L(pc)0.4 + 0.4. The horizontal line shows the mean CVD value, 1.0 km s−1 , of points with L > 10 pc. (A color version of this figure is available in the online journal.)
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The Astrophysical Journal, 765:161 (2pp), 2013 March 10
Erratum: 2012, ApJ, 760, 147
Table 4 Properties of the Cores Found in the 3D 13 CO Data Cube ID
R.A. (◦ )
Decl. (◦ )
Rmajor ( )
Rminor ( )
θ (◦ )
T (K)
M (M )
Mvir (M )
FWHM (km s−1 )
nH2 ,mean (cm−3 )
1 2 3 4 5
4h 35m 38.s 5 4h 31m 49.s 7 4h 23m 33.s 3 4h 26m 50.s 1 4h 31m 52.s 1
24d 6m 50.s 1 24d 33m 2.s 1 25d 3m 22.s 6 26d 13m 53.s 8 26d 14m 42.s 7
4.5 4.9 5.8 4.4 5.0
3.2 3.8 3.5 2.6 4.9
55.9 138.9 128.3 95.3 18.3
12.9 9.2 9.4 7.9 9.2
40.0 38.3 36.6 33.0 32.9
31.6 45.5 26.0 13.8 79.9
1.0 1.1 0.8 0.7 1.4
3297 3818 2483 3130 2473
Notes. Properties of the 13 CO cores. Following the identifiers in Column 1, the next two columns are the R.A. and decl. of the center of the fitted 13 CO cores. The semimajor axis Rmajor and semiminor axis Rminor of the fitted 13 CO cores follow. The sixth column is the position angle of 13 CO cores (angle from north to the major axis). The next column is the peak temperature of the 13 CO cores. The mass M and the virial mass Mvir follow. Column 10 gives the full width to half-maximum line width of the 13 CO line. The last column shows the estimated mean H2 density of the 13 CO cores. (This table is available in its entirety in a machine-readable form in the online journal. A portion is shown here for guidance regarding its form and content.)
In the caption of Figure 2 in the published paper, the data are divided into 14 regions (not 18 regions). In the caption of the Figure 13 in the published paper, the best fit to the mass–size relation should be M ∝ R 2.4 (not M ∝ R 2.6 ). The form of CVD in conclusion 5 of the published paper should be CVD (km s−1 ) = 0.3L(pc)0.5 +0.4 in the region 0 pc L 10 pc, similar to Larson’s law, with a median value of 0.98 km s−1 . Other conclusions of the paper are not affected.
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