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Browsing by Subject "ISM: magnetic fields"

Browsing by Subject "ISM: magnetic fields"

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  • Cloud motion and magnetic fields: Four clouds in the Cepheus Flare region 
    Sharma, Ekta; Maheswar, G; Dib, S (EDP Sciences, 2022-02)
    Context. The Cepheus Flare region consists of a group of dark cloud complexes that are currently active in star formation. Aims. The aim of this work is to estimate the motions of four clouds, namely L1147/1158, L1172/1174, ...
  • Distance, magnetic field, and kinematics of the filamentary cloud LDN 1157 
    Sharma, Ekta; Maheswar, G; Archana Soam; Lee, Chang Won; Kim, Shinyoung; Ghosh, Tuhin; Anandmayee Tej; Kim, Gwanjeong; Sharma, Neha; Saha, Piyali (EDP Sciences, 2020-07)
    Context. LDN 1157 is one of several clouds that are situated in the cloud complex LDN 1147/1158. The cloud presents a coma-shaped morphology with a well-collimated bipolar outflow emanating from a Class 0 protostar, LDN ...
  • The JCMT BISTRO Survey: multiwavelength polarimetry of bright regions in NGC 2071 in the far-infrared/submillimetre range, with POL-2 and HAWC+ 
    Fanciullo, Lapo; Kemper, Francisca; Pattle, Kate; Koch, Patrick M; Sadavoy, Sarah; Coude, Simon; Archana Soam; Hoang, Thiem; Onaka, Takashi; Gouellec, Valentin J M Le; Arzoumanian, Doris; Berry, David; Eswaraiah, Chakali; Chung, Eun Jung; Furuya, Ray; Hull, Charles L H; Hwang, Jihye; Johnstone, Douglas; Kang, Ji-hyun; Kim, Kyoung Hee; Kirchschlager, Florian; Konyves, Vera; Kwon, Jungmi; Kwon, Woojin; Lai, Shih-Ping; Lee, Chang Won; Liu, Tie; Lyo, A-Ran; Stephens, Ian; Tamura, Motohide; Tang, Xindi; Ward-Thompson, Derek; Whitworth, Anthony; Shinnaga, Hiroko (Oxford University Press on behalf of Royal Astronomical Society, 2022-05)
    Polarized dust emission is a key tracer in the study of interstellar medium and of star formation. The observed polarization, however, is a product of magnetic field structure, dust grain properties, and grain alignment ...
  • Magnetic field structure around cores with very low luminosity objects 
    Soam, A; Maheswar, G; Lee, C. W; Dib, S; Bhatt, H. C; Tamura, M; Kim, G (EDP Sciences, 2015-01)
    Aims. We carried out optical polarimetry of five dense cores, (IRAM 04191, L1521F, L328, L673-7, and L1014) which are found to harbour very low luminosity objects (VeLLOs; Lint ≲ 0.1 L⊙). This study was conducted mainly ...
  • The magnetic fields around the cometary globules L328, L323, and L331 
    Kumar, Siddharth; Archana Soam; Roy, Nirupam (Oxford University Press on behalf of Royal Astronomical Society, 2023-09)
    This work presents the magnetic field geometry in a complex of three cometary (with head–tail morphology) globules, namely LDN 323, LDN 328, and LDN 331, using R-band polarization measurements of background stars. These ...
  • Magnetic fields in cometary globules - III. CG 12 
    Bhatt, H. C; Maheswar, G; Manoj, P (Royal Astronomical Society, 2004-02-11)
    We present results of optical linear polarization measurements of stars in the region of the relatively isolated cometary globule CG 12 in Centaurus at a galactic latitude b~= 21°. A polarization map representing the ...
  • Magnetic fields in cometary globules – IV. LBN 437 
    Soam, A; Maheswar, G; Bhatt, H. C; Won Lee, C; Ramaprakash, A. N (Oxford University Press on behalf of the Royal Astronomical Society, 2013-06-21)
    We present results of our R-band polarimetry of a cometary globule, LBN 437 (Gal 96-15, ℓ = 96°, b = −15°), to study the magnetic field geometry of the cloud. We estimated a distance of 360 ± 65 pc to LBN 437 (also one ...
  • Magnetic fields in multiple bright-rimmed clouds in different directions of H II region IC 1396 
    Soam, A; Maheswar, G; Lee, C. W; Neha, S; Kim, K (Oxford University Press on behalf of the Royal Astronomical Society, 2018-06)
    Bright-rimmed clouds (BRCs) form on the edges of H II regions affected by high-energy radiation from a central ionizing source. The UV radiation from the ionizing source results in compression and ionization, causing either ...
  • Mean-field dynamo in partially ionized plasmas – I 
    Krishan, V; Gangadhara, R. T (Blackwell Publishing, 2008-04)
    There are several astrophysical situations where one needs to study the dynamics of magnetic flux in partially ionized turbulent plasmas. In a partially ionized plasma, the magnetic induction is subjected to the ambipolar ...
  • Optical Photometric and Polari metric investigation of NGC 1931 
    Pandey, A. K; Eswaraiah, C; Sharma, S; Samal, M. R; Chauhan, N; Chen, W. P; Jose, J; Ojha, D. K; Yadav, Ram Kesh; Chandola, H. C (IOP Publishing, 2013-02-05)
    We present optical photometric and polarimetric observations of stars toward NGC 1931 with the aim of deriving cluster parameters such as distance, reddening, age, and luminosity/mass function as well as understanding dust ...
  • Polarization of seven MBM clouds at high Galactic latitude 
    Neha, S; Maheswar, G; Soam, A; Lee, C. W (Oxford University Press on behalf of the Royal Astronomical Society, 2018-06)
    We made R-band polarization measurements of 234 stars towards the direction of the MBM 33–39 cloud complex. The distance of the MBM 33–39 complex was determined as 120 ± 10 pc using polarization results and near-infrared ...
  • Probing magnetic fields with square kilometre array and its precursors 
    Roy, S; Sur, Sharanya; Subramanian, K; Mangalam, A; Seshadri, T. R; Chand, H (Indian Academy of Sciences, 2016-12)
    Origin of magnetic fields, its structure and effects on dynamical processes in stars to galaxies are not well understood. Lack of a direct probe has remained a problem for its study. The first phase of Square Kilometre ...
  • The role of magnetic fields in the stability and fragmentation of filamentary molecular clouds: two case studies at OMC-3 and OMC-4 
    Li, Pak Shing; Lopez-Rodriguez, Enrique; Archana Soam; Klein, Richard I (Oxford University Press on behalf of Royal Astronomical Society, 2022-08)
    We present the stability analysis of two regions, OMC-3 and OMC-4, in the massive and long molecular cloud complex of Orion A. We obtained 214 μm HAWC + /SOFIA polarization data, and we make use of archival data for the ...
  • A study of the starless dark cloud LDN 1570: Distance, dust properties, and magnetic field geometry 
    Eswaraiah, C; Maheswar, G; Pandey, A. K; Jose, J; Ramaprakash, A. N; Bhatt, H. C (EDP Sciences, 2013-08)
    Aims. We aim to map the magnetic field geometry and to study the dust properties of the starless cloud, L1570, using multi-wavelength optical polarimetry and photometry of the stars projected on the cloud. Methods. The ...
  • Tracing the magnetic field morphology of the LDN 1172/1174 cloud complex 
    Saha, Piyali; Maheswar, G; Sharma, Ekta; Lee, Chang Won; Ghosh, Tuhin; Kim, Shinyoung (EDP Sciences, 2021-11)
    Context. The LDN 1172/1174 cloud complex in the Cepheus Flare region presents a hub-filament structure with the reflection nebula, NGC 7023, illuminated by a Herbig Be star, HD 200775, which consists of the hub with a ~5 ...

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