Study of magnetic field geometry and extinction in Bok globule CB130

Chakraborty, Anindita; Das, Himadri Sekhar

doi:10.1007/s10509-016-2905-y

Cited by 9 publications

(5 citation statements)

References 55 publications

(83 reference statements)

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“…and CB130 (Barman & Das 2015;Chakraborty & Das 2016). We have collected the J, H and K s magnitudes of all field stars from the 2MASS Point Source Catalog in regions of 25 ′ × 25 ′ centered on the globule CB34 (Cutri et al 2003), to build the extinction map.…”

Section: Low Density Regionmentioning

confidence: 99%

“…Complementary to this, the thermal reemission of aligned grains located in the high-density central region of molecular clouds is linearly polarized perpendicular to the magnetic field direction and can thus be studied through submillimeter polarimetric measurement. Numerous studies have been made on molecular clouds through optical and submillimeter polarimetry (Kane et al 1995;Wolf et al 2003;Alves et al 2008;Ward-Thompson et al 2009;Franco et al 2010;Paul et al 2012;Chakraborty et al 2014;Bertrang et al 2014;Chakraborty & Das 2016).…”

Section: Introductionmentioning

confidence: 99%

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Magnetic field geometry of the large globule CB 34

Das

Medhi

et al. 2016

Astrophys Space Sci

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We report the results of optical polarimetric observations of a Bok globule CB34 to study magnetic field structure on large scales (10 5 − 10 6 AU), which is combined with archival sub-mm observations to characterize the magnetic field structure of CB34 on small scales (10 4 −10 5 AU). The optical polarization measurements indicate that the magnetic field in the globule is constrained to a maximum radius of 10 5 AU around the core, out to densities not smaller than 10 4 cm −3 . Our study is mainly concentrated on two submillimeter cores C1 and C2 of CB34. The direction of magnetic field of core C2 is found to be nearly perpendicular to the CO outflow direction of the globule. The magnetic field of core C1 is almost aligned with the minor axis of the core which is typical for magnetically dominated star formation models. The mean value of offset between the minor axis of core C2 and the outflow direction is found to be 14• which suggests that the direction of the outflow is almost aligned with the minor axis of core C2. The magnetic field strength in the plane-ofsky for cores C1 and C2 is estimated to be ≈ 34µG and ≈ 70µG.

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Section: Low Density Regionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic field geometry of the large globule CB 34

Das

Medhi

et al. 2016

Astrophys Space Sci

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“…Various studies were carried out to find a correlation between the orientation of envelope magnetic field in molecular clouds with the orientation of the GP (e.g., Sen et al 2000;Soam et al 2015;Chakraborty & Das 2016;Das et al 2016;Choudhury et al 2019). The magnetic lines of force in the spiral arm of our Galaxy are parallel to the arm everywhere (Ireland & Hoyle 1961).…”

Section: Relative Orientation Between the Magnetic Field And The Gala...mentioning

confidence: 99%

“…The observed region around each globule is divided into four fields of 8′ × 8′ dimension because the CCD has a field of view of ∼8′ in diameter. The observations were carried out with the 104 cm Sampurnanand Telescope (ST) at Aryabhatta Research Institute of Observational Sciences, Nainital, India (for exemplary previous polarimetric observations using this telescope see Chakraborty et al 2014;Chakraborty & Das 2016;Das et al 2016). The observation log is presented in Table 1.…”

Section: Observationsmentioning

confidence: 99%

“…Several researchers studied the orientation of the magnetic field through imaging polarimetry (Chakraborty et al 2014;Soam et al 2015Soam et al , 2017Chakraborty & Das 2016;Das et al 2016;Jorquera & Bertrang 2018;Choudhury et al 2019;Zielinski et al 2021) and discussed the relative orientation of the magnetic field to the galactic plane (GP), outflow direction and minor axis of the cloud. The optical polarimetric analysis reveals that the envelope magnetic field of CB130 is oriented at an angle of 53°with respect to the orientation of GP (Chakraborty & Das 2016). Das et al (2016) estimated the magnetic field strength of two submillimeter (sub-mm) cores of CB34 from the archival sub-mm polarimetric data.…”

Section: Introductionmentioning

confidence: 99%

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The Relative Orientation between Local Magnetic Field and Galactic Plane in Low Latitude Dark Clouds

Choudhury¹,

Das²,

Medhi³

et al. 2022

Res. Astron. Astrophys.

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In this work, we study the magnetic field morphology of selected star-forming clouds spread over the galactic latitude ($b$) range, $-10^\circ$ to $10^\circ$. The polarimetric observation of clouds CB24, CB27 and CB188 are conducted to study the magnetic field geometry of those clouds using the 104-cm Sampurnanand Telescope (ST) located at ARIES, Manora Peak, Nainital, India. These observations are combined with those of 14 further low latitude clouds available in the literature. Most of these clouds are located within a distance range 140 to 500 pc except for CB3 ($\sim$2500 pc), CB34 ($\sim$1500 pc), CB39 ($\sim$1500 pc) and CB60 ($\sim$1500 pc). Analyzing the polarimetric data of 17 clouds, we find that the alignment between the envelope magnetic field ($\theta_{B}^{env}$) and Galactic plane ($\theta_{GP}$) of the low-latitude clouds varies with their galactic longitudes ($l$). We observe a strong correlation between the longitude (\textit{l}) and the offset ($\theta_{off}=|\theta_B^{env}-\theta_{GP}|$) which shows that $\theta_{B}^{env}$ is parallel to the Galactic plane (GP) when the clouds are situated in the region, $115^\circ<l<250^\circ$. However, $\theta_{B}^{env}$ has its own local deflection irrespective of the orientation of $\theta_{GP}$ when the clouds are at $l<100^\circ$ and $l>250^\circ$. To check the consistency of our results, the stellar polarization data available at Heiles (2000) catalogue are overlaid on DSS image of the clouds having mean polarization vector of field stars. The results are almost consistent with the Heiles data and a systematic discussion is presented in the paper. The effect of turbulence of the cloud is also studied which may play an important role in causing the misalignment phenomenon observed between $\theta_{B}^{env}$ and $\theta_{GP}$. We have used \textit{Herschel}\footnote{Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.} \textit{SPIRE} 500 $\mu m$ and \textit{SCUBA} 850 $\mu m$ dust continuum emission maps in our work to understand the density structure of the clouds.

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Investigating the extinction and magnetic field geometry in the Bok globule CB26

Paul,

Halder,

Das

et al. 2024

Monthly Notices of the Royal Astronomical Society

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This study investigates the extinction properties, dust distribution, and magnetic field characteristics of the CB26 cloud. Extinction mapping, derived from near-infrared photometry, reveals a good correlation with the dust distribution, as traced by Herschel** SPIRE 500 μm data, indicating a close link between dust and extinction. The derived column density estimates align with previous Herschel studies. Our optical polarization observations of CB26 reveal a well-aligned magnetic field in the cloud’s low-density envelope, closely following the Galactic plane. In contrast, our reanalysis of archival submillimeter polarization data of CB26 suggests a distinct magnetic field orientation within the cloud core. The offset angle between the core and Galactic magnetic fields is approximately 90○, suggesting a decoupling of the core’s magnetic field from the large-scale Galactic field. A relationship is found between polarization rate and distance for 24 field stars in CB26, suggesting that most of the polarization is contributed by dust within 600 pc along the line of sight.

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Study of magnetic field geometry and extinction in Bok globule CB130

Cited by 9 publications

References 55 publications

Magnetic field geometry of the large globule CB 34

Magnetic field geometry of the large globule CB 34

The Relative Orientation between Local Magnetic Field and Galactic Plane in Low Latitude Dark Clouds

Investigating the extinction and magnetic field geometry in the Bok globule CB26

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