Abstract
We trace the peripheral magnetic field structure of Bok globule CB130 by estimating the linear polarization of its field stars in the R band. The magnetic field orientation sampled by these stars, aligned on average among themselves, and the polarization produced within the cloud has a different direction from that of Galactic plane with an offset of \(53^{\circ}\). The offset between minor axis and the mean magnetic field of CB130 is found to be \(80^{\circ}\). The estimated strength of the magnetic field in the plane-of-the-sky is \(\sim116\pm19~\upmu\mbox{G}\). We constructed the visual extinction map using the Near Infrared Color Excess (NICE) method to see the dust distribution around CB130. Contours of Herschel (Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA) SPIRE \(500~\upmu\mbox{m}\) dust continuum emission map of this cloud is over-plotted on the visual extinction map, which shows that the regions having higher optical extinction correspond to higher densities of dust. Three distinct high dust density cores (named as C1, C2, and C3) are identified in the extinction map. It is observed that the cores C1 and C3 are located close to two previously known cores CB130-1 and CB130-2, respectively. Estimates of visual extinction of some moderately obscured stars of CB130 are made utilizing near-infrared photometry. It is observed that there is a feeble dependence of polarization on extinction, and the polarization efficiency (defined as \(p/A_{V}\)) of the dust grains decreases with the increase in extinction.
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Notes
The Caltech Submillimeter Observatory is supported by the NSF.
These polarization measurements are not true vectors because they have an 180 degree ambiguity.
Here we have considered only those sources whose uncertainties in J, H, and K filters are \(\leq0.03~\mbox{mag}\).
\(\mathrm{S.E.}=\frac{\sigma_{\theta}}{\sqrt{N}}\) (Everitt 2003), where \(N\) represents the sample size; for our case, \(N=39\).
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Acknowledgements
We gratefully acknowledge IUCAA, Pune, for making telescope time available. We are also grateful to Dr. V. Mohan of IUCAA for hel** us in probing CB 130 in polarimetric mode. The anonymous reviewer of this paper is highly acknowledged for his constructive comments, which definitely contributed to improving the quality of the paper. We also acknowledge the use of the VizieR database of astronomical catalogues, namely Two-Micron All Sky Survey (2MASS), which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This work is supported by the Science and Engineering Research Board (SERB), a statutory body under Department of Science and Technology (DST), Government of India, under Fast Track scheme for Young Scientist (SR/FTP/PS-092/2011).
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Chakraborty, A., Das, H.S. Study of magnetic field geometry and extinction in Bok globule CB130. Astrophys Space Sci 361, 321 (2016). https://doi.org/10.1007/s10509-016-2905-y
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DOI: https://doi.org/10.1007/s10509-016-2905-y