Dust polarization observations are a powerful, practical tool to probe the geometry (and to some extent, the strength) of magnetic fields in starforming regions. In particular, Planck polarization data have revealed the importance of magnetic fields on large scales in molecular clouds. However, due to insufficient resolution, Planck observations are unable to constrain the B-field geometry on prestellar and protostellar scales. The high angular resolution of 11.7 arcsec provided by NIKA2-Pol 1.15 mm polarimetric imaging, corresponding to 0.02 pc at the distance of the Orion molecular cloud (OMC), makes it possible to advance our understanding of the B-field morphology in star-forming filaments and dense cores (IRAM 30m large program B-FUN). The commissioning of the NIKA2-Pol instrument has led to several challenging issues, in particular, the instrumental polarization or intensity-to-polarization “leakage” effect. In the present paper, we illustrate how this effect can be corrected for, leading to reliable exploitable data in a structured, extended source such as OMC-1. We present a statistical comparison between NIKA2-Pol and SCUBA2-Pol2 results in the OMC-1 region. We also present tentative evidence of local pinching of the B-field lines near Orion-KL, in the form of a new small-scale hourglass pattern, in addition to the larger-scale hourglass already seen by other instruments such as Pol2.

Probing the role of magnetic fields in star-forming filaments: NIKA2-Pol commissioning results toward OMC-1 / Ajeddig, H.; Adam, R.; Ade, P.; André, P.; Artis, E.; Aussel, H.; Beelen, A.; Benoît, A.; Berta, S.; Bing, L.; Bourrion, O.; Calvo, M.; Catalano, A.; De Petris, M.; Désert, F. -X.; Doyle, S.; Driessen, E. F. C.; Gomez, A.; Goupy, J.; Kéruzoré, F.; Kramer, C.; Ladjelate, B.; Lagache, G.; Leclercq, S.; Lestrade, J. -F.; Macías-Pérez, J. -F.; Maury, A.; Mauskopf, P.; Mayet, F.; Monfardini, A.; Muñoz-Echeverría, M.; Perotto, L.; Pisano, G.; Ponthieu, N.; Revéret, V.; Rigby, A. J.; Ritacco, A.; Romero, C.; Roussel, H.; Ruppin, F.; Schuster, K.; Shu, S.; Sievers, A.; Tucker, C.; Shimajiri, R. Zylka and Y.. - In: EPJ WEB OF CONFERENCES. - ISSN 2100-014X. - 257:(2022). (Intervento presentato al convegno mm Universe @ NIKA2 - Observing the mm Universe with the NIKA2 camera tenutosi a Rome) [10.1051/epjconf/202225700001].

Probing the role of magnetic fields in star-forming filaments: NIKA2-Pol commissioning results toward OMC-1

M. De Petris;G. Pisano;
2022

Abstract

Dust polarization observations are a powerful, practical tool to probe the geometry (and to some extent, the strength) of magnetic fields in starforming regions. In particular, Planck polarization data have revealed the importance of magnetic fields on large scales in molecular clouds. However, due to insufficient resolution, Planck observations are unable to constrain the B-field geometry on prestellar and protostellar scales. The high angular resolution of 11.7 arcsec provided by NIKA2-Pol 1.15 mm polarimetric imaging, corresponding to 0.02 pc at the distance of the Orion molecular cloud (OMC), makes it possible to advance our understanding of the B-field morphology in star-forming filaments and dense cores (IRAM 30m large program B-FUN). The commissioning of the NIKA2-Pol instrument has led to several challenging issues, in particular, the instrumental polarization or intensity-to-polarization “leakage” effect. In the present paper, we illustrate how this effect can be corrected for, leading to reliable exploitable data in a structured, extended source such as OMC-1. We present a statistical comparison between NIKA2-Pol and SCUBA2-Pol2 results in the OMC-1 region. We also present tentative evidence of local pinching of the B-field lines near Orion-KL, in the form of a new small-scale hourglass pattern, in addition to the larger-scale hourglass already seen by other instruments such as Pol2.
2022
mm Universe @ NIKA2 - Observing the mm Universe with the NIKA2 camera
polarization; molecular cloud; millimetre observations
04 Pubblicazione in atti di convegno::04c Atto di convegno in rivista
Probing the role of magnetic fields in star-forming filaments: NIKA2-Pol commissioning results toward OMC-1 / Ajeddig, H.; Adam, R.; Ade, P.; André, P.; Artis, E.; Aussel, H.; Beelen, A.; Benoît, A.; Berta, S.; Bing, L.; Bourrion, O.; Calvo, M.; Catalano, A.; De Petris, M.; Désert, F. -X.; Doyle, S.; Driessen, E. F. C.; Gomez, A.; Goupy, J.; Kéruzoré, F.; Kramer, C.; Ladjelate, B.; Lagache, G.; Leclercq, S.; Lestrade, J. -F.; Macías-Pérez, J. -F.; Maury, A.; Mauskopf, P.; Mayet, F.; Monfardini, A.; Muñoz-Echeverría, M.; Perotto, L.; Pisano, G.; Ponthieu, N.; Revéret, V.; Rigby, A. J.; Ritacco, A.; Romero, C.; Roussel, H.; Ruppin, F.; Schuster, K.; Shu, S.; Sievers, A.; Tucker, C.; Shimajiri, R. Zylka and Y.. - In: EPJ WEB OF CONFERENCES. - ISSN 2100-014X. - 257:(2022). (Intervento presentato al convegno mm Universe @ NIKA2 - Observing the mm Universe with the NIKA2 camera tenutosi a Rome) [10.1051/epjconf/202225700001].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1604932
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