The JCMT BISTRO Survey: An 850/450 μ m Polarization Study of NGC 2071IR in Orion B

A-Ran Lyo; Jongsoo Kim; Sarah Sadavoy; Doug Johnstone; David Berry; Kate Pattle; Woojin Kwon; Pierre Bastien; Takashi Onaka; James Di Francesco; Ji-Hyun Kang; Ray Furuya; Charles L. H. Hull; Motohide Tamura; Patrick M. Koch; Derek Ward-Thompson; Tetsuo Hasegawa; Thiem Hoang; Doris Arzoumanian; Chang Won Lee; Chin-Fei Lee; Do-Young Byun; Florian Kirchschlager; Yasuo Doi; Kee-Tae Kim; Jihye Hwang; Pham Ngoc Diep; Lapo Fanciullo; Sang-Sung Lee; Geumsook Park; Hyunju Yoo; Eun Jung Chung; Anthony Whitworth; Steve Mairs; Archana Soam; Tie Liu; Xindi Tang; Simon Coudé; Philippe André; Tyler L. Bourke; Huei-Ru Vivien Chen; Zhiwei Chen; Wen Ping Chen; Mike Chen; Tao-Chung Ching; Jungyeon Cho; Minho Choi; Yunhee Choi; Antonio Chrysostomou; Sophia Dai; C. Darren Dowell; Hao-Yuan Duan; Yan Duan; David Eden; Chakali Eswaraiah; Stewart Eyres; Jason Fiege; Laura M. Fissel; Erica Franzmann; Per Friberg; Rachel Friesen; Gary Fuller; Tim Gledhill; Sarah Graves; Jane Greaves; Matt Griffin; Qilao Gu; Ilseung Han; Jannifer Hatchell; Saeko Hayashi; Martin Houde; Tsuyoshi Inoue; Shu-ichiro Inutsuka; Kazunari Iwasaki; Il-Gyo Jeong; Miju Kang; Akimasa Kataoka; Koji Kawabata; Francisca Kemper; Gwanjeong Kim; Mi-Ryang Kim; Shinyoung Kim; Kyoung Hee Kim; Jason Kirk; Masato I. N. Kobayashi; Vera Könyves; Takayoshi Kusune; Jungmi Kwon; Kevin Lacaille; Shih-Ping Lai; Chi-Yan Law; Jeong-Eun Lee; Yong-Hee Lee; Hyeseung Lee; Dalei Li; Di Li; Hua-Bai Li; Hong-Li Liu; Junhao Liu; Sheng-Yuan Liu; Xing Lu; Masafumi Matsumura; Brenda Matthews; Gerald Moriarty-Schieven; Tetsuya Nagata; Fumitaka Nakamura; Hiroyuki Nakanishi; Nguyen Bich Ngoc; Nagayoshi Ohashi; Harriet Parsons; Nicolas Peretto; Felix Priestley; Tae-soo Pyo; Lei Qian; Keping Qiu; Ramprasad Rao; Jonathan Rawlings; Mark G. Rawlings; Brendan Retter; John Richer; Andrew Rigby; Hiro Saito; Giorgio Savini; Anna Scaife; Masumichi Seta; Yoshito Shimajiri; Hiroko Shinnaga; Mehrnoosh Tahani; Ya-Wen Tang; Kohji Tomisaka; Le Ngoc Tram; Yusuke Tsukamoto; Serena Viti; Jia-Wei Wang; Hongchi Wang; Jinjin Xie; Hsi-Wei Yen; Jinghua Yuan; Hyeong-Sik Yun; Tetsuya Zenko; Guoyin Zhang; Chuan-Peng Zhang; Yapeng Zhang; Jianjun Zhou; Lei Zhu; Ilse de Looze; Sam Falle; Jean-François Robitaille; Sven van Loo

doi:10.3847/1538-4357/ac0ce9

The JCMT BISTRO Survey: An 850/450 μ m Polarization Study of NGC 2071IR in Orion B

A-Ran Lyo^*, Jongsoo Kim, Sarah Sadavoy, Doug Johnstone, David Berry, Kate Pattle, Woojin Kwon, Pierre Bastien, Takashi Onaka, James Di Francesco, Ji-Hyun Kang, Ray Furuya, Charles L. H. Hull, Motohide Tamura, Patrick M. Koch, Derek Ward-Thompson, Tetsuo Hasegawa, Thiem Hoang, Doris Arzoumanian, Chang Won LeeChin-Fei Lee, Do-Young Byun, Florian Kirchschlager, Yasuo Doi, Kee-Tae Kim, Jihye Hwang, Pham Ngoc Diep, Lapo Fanciullo, Sang-Sung Lee, Geumsook Park, Hyunju Yoo, Eun Jung Chung, Anthony Whitworth, Steve Mairs, Archana Soam, Tie Liu, Xindi Tang, Simon Coudé, Philippe André, Tyler L. Bourke, Huei-Ru Vivien Chen, Zhiwei Chen, Wen Ping Chen, Mike Chen, Tao-Chung Ching, Jungyeon Cho, Minho Choi, Yunhee Choi, Antonio Chrysostomou, Sophia Dai, C. Darren Dowell, Hao-Yuan Duan, Yan Duan, David Eden, Chakali Eswaraiah, Stewart Eyres, Jason Fiege, Laura M. Fissel, Erica Franzmann, Per Friberg, Rachel Friesen, Gary Fuller, Tim Gledhill, Sarah Graves, Jane Greaves, Matt Griffin, Qilao Gu, Ilseung Han, Jannifer Hatchell, Saeko Hayashi, Martin Houde, Tsuyoshi Inoue, Shu-ichiro Inutsuka, Kazunari Iwasaki, Il-Gyo Jeong, Miju Kang, Akimasa Kataoka, Koji Kawabata, Francisca Kemper, Gwanjeong Kim, Mi-Ryang Kim, Shinyoung Kim, Kyoung Hee Kim, Jason Kirk, Masato I. N. Kobayashi, Vera Könyves, Takayoshi Kusune, Jungmi Kwon, Kevin Lacaille, Shih-Ping Lai, Chi-Yan Law, Jeong-Eun Lee, Yong-Hee Lee, Hyeseung Lee, Dalei Li, Di Li, Hua-Bai Li, Hong-Li Liu, Junhao Liu, Sheng-Yuan Liu, Xing Lu, Masafumi Matsumura, Brenda Matthews, Gerald Moriarty-Schieven, Tetsuya Nagata, Fumitaka Nakamura, Hiroyuki Nakanishi, Nguyen Bich Ngoc, Nagayoshi Ohashi, Harriet Parsons, Nicolas Peretto, Felix Priestley, Tae-soo Pyo, Lei Qian, Keping Qiu, Ramprasad Rao, Jonathan Rawlings, Mark G. Rawlings, Brendan Retter, John Richer, Andrew Rigby, Hiro Saito, Giorgio Savini, Anna Scaife, Masumichi Seta, Yoshito Shimajiri, Hiroko Shinnaga, Mehrnoosh Tahani, Ya-Wen Tang, Kohji Tomisaka, Le Ngoc Tram, Yusuke Tsukamoto, Serena Viti, Jia-Wei Wang, Hongchi Wang, Jinjin Xie, Hsi-Wei Yen, Jinghua Yuan, Hyeong-Sik Yun, Tetsuya Zenko, Guoyin Zhang, Chuan-Peng Zhang, Yapeng Zhang, Jianjun Zhou, Lei Zhu, Ilse de Looze, Sam Falle, Jean-François Robitaille, Sven van Loo

^*Corresponding author for this work

Faculty of Computing, Engineering and Science

Research output: Contribution to journal › Article › peer-review

15 Downloads (Pure)

Abstract

Abstract: We present the results of simultaneous 450 μm and 850 μm polarization observations toward the massive star-forming region NGC 2071IR, a target of the BISTRO (B-fields in STar-forming Region Observations) Survey, using the POL-2 polarimeter and SCUBA-2 camera mounted on the James Clerk Maxwell Telescope. We find a pinched magnetic field morphology in the central dense core region, which could be due to a rotating toroidal disklike structure and a bipolar outflow originating from the central young stellar object IRS 3. Using the modified Davis–Chandrasekhar–Fermi method, we obtain a plane-of-sky magnetic field strength of 563 ± 421 μG in the central ∼0.12 pc region from 850 μm polarization data. The corresponding magnetic energy density of 2.04 × 10−8 erg cm−3 is comparable to the turbulent and gravitational energy densities in the region. We find that the magnetic field direction is very well aligned with the whole of the IRS 3 bipolar outflow structure. We find that the median value of polarization fractions is 3.0% at 450 μm in the central 3′ region, which is larger than the median value of 1.2% at 850 μm. The trend could be due to the better alignment of warmer dust in the strong radiation environment. We also find that polarization fractions decrease with intensity at both wavelengths, with slopes, determined by fitting a Rician noise model of 0.59 ± 0.03 at 450 μm and 0.36 ± 0.04 at 850 μm, respectively. We think that the shallow slope at 850 μm is due to grain alignment at the center being assisted by strong radiation from the central young stellar objects.

Original language	English
Pages (from-to)	85
Journal	The Astrophysical Journal
Volume	918
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/ac0ce9
Publication status	Published - Sept 2021

Keywords

320
Interstellar Matter and the Local Universe

Access to Document

10.3847/1538-4357/ac0ce9Licence: CC BY

Version of Record with a CC BY LicenceFinal published version, 2.16 MBLicence: CC BY

Cite this

Lyo, A.-R., Kim, J., Sadavoy, S., Johnstone, D., Berry, D., Pattle, K., Kwon, W., Bastien, P., Onaka, T., Di Francesco, J., Kang, J.-H., Furuya, R., Hull, C. L. H., Tamura, M., Koch, P. M., Ward-Thompson, D., Hasegawa, T., Hoang, T., Arzoumanian, D., ... van Loo, S. (2021). The JCMT BISTRO Survey: An 850/450 μ m Polarization Study of NGC 2071IR in Orion B. The Astrophysical Journal, 918(2), 85. https://doi.org/10.3847/1538-4357/ac0ce9

@article{15e1d155873e4f07af3948717d72b01b,

title = "The JCMT BISTRO Survey: An 850/450 μ m Polarization Study of NGC 2071IR in Orion B",

abstract = "Abstract: We present the results of simultaneous 450 μm and 850 μm polarization observations toward the massive star-forming region NGC 2071IR, a target of the BISTRO (B-fields in STar-forming Region Observations) Survey, using the POL-2 polarimeter and SCUBA-2 camera mounted on the James Clerk Maxwell Telescope. We find a pinched magnetic field morphology in the central dense core region, which could be due to a rotating toroidal disklike structure and a bipolar outflow originating from the central young stellar object IRS 3. Using the modified Davis–Chandrasekhar–Fermi method, we obtain a plane-of-sky magnetic field strength of 563 ± 421 μG in the central ∼0.12 pc region from 850 μm polarization data. The corresponding magnetic energy density of 2.04 × 10−8 erg cm−3 is comparable to the turbulent and gravitational energy densities in the region. We find that the magnetic field direction is very well aligned with the whole of the IRS 3 bipolar outflow structure. We find that the median value of polarization fractions is 3.0% at 450 μm in the central 3′ region, which is larger than the median value of 1.2% at 850 μm. The trend could be due to the better alignment of warmer dust in the strong radiation environment. We also find that polarization fractions decrease with intensity at both wavelengths, with slopes, determined by fitting a Rician noise model of 0.59 ± 0.03 at 450 μm and 0.36 ± 0.04 at 850 μm, respectively. We think that the shallow slope at 850 μm is due to grain alignment at the center being assisted by strong radiation from the central young stellar objects.",

keywords = "320, Interstellar Matter and the Local Universe",

author = "A-Ran Lyo and Jongsoo Kim and Sarah Sadavoy and Doug Johnstone and David Berry and Kate Pattle and Woojin Kwon and Pierre Bastien and Takashi Onaka and {Di Francesco}, James and Ji-Hyun Kang and Ray Furuya and Hull, {Charles L. H.} and Motohide Tamura and Koch, {Patrick M.} and Derek Ward-Thompson and Tetsuo Hasegawa and Thiem Hoang and Doris Arzoumanian and {Won Lee}, Chang and Chin-Fei Lee and Do-Young Byun and Florian Kirchschlager and Yasuo Doi and Kee-Tae Kim and Jihye Hwang and Diep, {Pham Ngoc} and Lapo Fanciullo and Sang-Sung Lee and Geumsook Park and Hyunju Yoo and Chung, {Eun Jung} and Anthony Whitworth and Steve Mairs and Archana Soam and Tie Liu and Xindi Tang and Simon Coud{\'e} and Philippe Andr{\'e} and Bourke, {Tyler L.} and {Vivien Chen}, Huei-Ru and Zhiwei Chen and {Ping Chen}, Wen and Mike Chen and Tao-Chung Ching and Jungyeon Cho and Minho Choi and Yunhee Choi and Antonio Chrysostomou and Sophia Dai and Dowell, {C. Darren} and Hao-Yuan Duan and Yan Duan and David Eden and Chakali Eswaraiah and Stewart Eyres and Jason Fiege and Fissel, {Laura M.} and Erica Franzmann and Per Friberg and Rachel Friesen and Gary Fuller and Tim Gledhill and Sarah Graves and Jane Greaves and Matt Griffin and Qilao Gu and Ilseung Han and Jannifer Hatchell and Saeko Hayashi and Martin Houde and Tsuyoshi Inoue and Shu-ichiro Inutsuka and Kazunari Iwasaki and Il-Gyo Jeong and Miju Kang and Akimasa Kataoka and Koji Kawabata and Francisca Kemper and Gwanjeong Kim and Mi-Ryang Kim and Shinyoung Kim and Kim, {Kyoung Hee} and Jason Kirk and Kobayashi, {Masato I. N.} and Vera K{\"o}nyves and Takayoshi Kusune and Jungmi Kwon and Kevin Lacaille and Shih-Ping Lai and Chi-Yan Law and Jeong-Eun Lee and Yong-Hee Lee and Hyeseung Lee and Dalei Li and Di Li and Hua-Bai Li and Hong-Li Liu and Junhao Liu and Sheng-Yuan Liu and Xing Lu and Masafumi Matsumura and Brenda Matthews and Gerald Moriarty-Schieven and Tetsuya Nagata and Fumitaka Nakamura and Hiroyuki Nakanishi and {Bich Ngoc}, Nguyen and Nagayoshi Ohashi and Harriet Parsons and Nicolas Peretto and Felix Priestley and Tae-soo Pyo and Lei Qian and Keping Qiu and Ramprasad Rao and Jonathan Rawlings and Rawlings, {Mark G.} and Brendan Retter and John Richer and Andrew Rigby and Hiro Saito and Giorgio Savini and Anna Scaife and Masumichi Seta and Yoshito Shimajiri and Hiroko Shinnaga and Mehrnoosh Tahani and Ya-Wen Tang and Kohji Tomisaka and Tram, {Le Ngoc} and Yusuke Tsukamoto and Serena Viti and Jia-Wei Wang and Hongchi Wang and Jinjin Xie and Hsi-Wei Yen and Jinghua Yuan and Hyeong-Sik Yun and Tetsuya Zenko and Guoyin Zhang and Chuan-Peng Zhang and Yapeng Zhang and Jianjun Zhou and Lei Zhu and {de Looze}, Ilse and Sam Falle and Jean-Fran{\c c}ois Robitaille and {van Loo}, Sven",

year = "2021",

month = sep,

doi = "10.3847/1538-4357/ac0ce9",

language = "English",

volume = "918",

pages = "85",

journal = "The Astrophysical Journal",

issn = "0004-637X",

publisher = "University of Chicago Press",

number = "2",

}

Lyo, A-R, Kim, J, Sadavoy, S, Johnstone, D, Berry, D, Pattle, K, Kwon, W, Bastien, P, Onaka, T, Di Francesco, J, Kang, J-H, Furuya, R, Hull, CLH, Tamura, M, Koch, PM, Ward-Thompson, D, Hasegawa, T, Hoang, T, Arzoumanian, D, Won Lee, C, Lee, C-F, Byun, D-Y, Kirchschlager, F, Doi, Y, Kim, K-T, Hwang, J, Diep, PN, Fanciullo, L, Lee, S-S, Park, G, Yoo, H, Chung, EJ, Whitworth, A, Mairs, S, Soam, A, Liu, T, Tang, X, Coudé, S, André, P, Bourke, TL, Vivien Chen, H-R, Chen, Z, Ping Chen, W, Chen, M, Ching, T-C, Cho, J, Choi, M, Choi, Y, Chrysostomou, A, Dai, S, Dowell, CD, Duan, H-Y, Duan, Y, Eden, D, Eswaraiah, C, Eyres, S, Fiege, J, Fissel, LM, Franzmann, E, Friberg, P, Friesen, R, Fuller, G, Gledhill, T, Graves, S, Greaves, J, Griffin, M, Gu, Q, Han, I, Hatchell, J, Hayashi, S, Houde, M, Inoue, T, Inutsuka, S, Iwasaki, K, Jeong, I-G, Kang, M, Kataoka, A, Kawabata, K, Kemper, F, Kim, G, Kim, M-R, Kim, S, Kim, KH, Kirk, J, Kobayashi, MIN, Könyves, V, Kusune, T, Kwon, J, Lacaille, K, Lai, S-P, Law, C-Y, Lee, J-E, Lee, Y-H, Lee, H, Li, D, Li, D, Li, H-B, Liu, H-L, Liu, J, Liu, S-Y, Lu, X, Matsumura, M, Matthews, B, Moriarty-Schieven, G, Nagata, T, Nakamura, F, Nakanishi, H, Bich Ngoc, N, Ohashi, N, Parsons, H, Peretto, N, Priestley, F, Pyo, T, Qian, L, Qiu, K, Rao, R, Rawlings, J, Rawlings, MG, Retter, B, Richer, J, Rigby, A, Saito, H, Savini, G, Scaife, A, Seta, M, Shimajiri, Y, Shinnaga, H, Tahani, M, Tang, Y-W, Tomisaka, K, Tram, LN, Tsukamoto, Y, Viti, S, Wang, J-W, Wang, H, Xie, J, Yen, H-W, Yuan, J, Yun, H-S, Zenko, T, Zhang, G, Zhang, C-P, Zhang, Y, Zhou, J, Zhu, L, de Looze, I, Falle, S, Robitaille, J-F & van Loo, S 2021, 'The JCMT BISTRO Survey: An 850/450 μ m Polarization Study of NGC 2071IR in Orion B', The Astrophysical Journal, vol. 918, no. 2, pp. 85. https://doi.org/10.3847/1538-4357/ac0ce9

TY - JOUR

T1 - The JCMT BISTRO Survey: An 850/450 μ m Polarization Study of NGC 2071IR in Orion B

AU - Lyo, A-Ran

AU - Kim, Jongsoo

AU - Sadavoy, Sarah

AU - Johnstone, Doug

AU - Berry, David

AU - Pattle, Kate

AU - Kwon, Woojin

AU - Bastien, Pierre

AU - Onaka, Takashi

AU - Di Francesco, James

AU - Kang, Ji-Hyun

AU - Furuya, Ray

AU - Hull, Charles L. H.

AU - Tamura, Motohide

AU - Koch, Patrick M.

AU - Ward-Thompson, Derek

AU - Hasegawa, Tetsuo

AU - Hoang, Thiem

AU - Arzoumanian, Doris

AU - Won Lee, Chang

AU - Lee, Chin-Fei

AU - Byun, Do-Young

AU - Kirchschlager, Florian

AU - Doi, Yasuo

AU - Kim, Kee-Tae

AU - Hwang, Jihye

AU - Diep, Pham Ngoc

AU - Fanciullo, Lapo

AU - Lee, Sang-Sung

AU - Park, Geumsook

AU - Yoo, Hyunju

AU - Chung, Eun Jung

AU - Whitworth, Anthony

AU - Mairs, Steve

AU - Soam, Archana

AU - Liu, Tie

AU - Tang, Xindi

AU - Coudé, Simon

AU - André, Philippe

AU - Bourke, Tyler L.

AU - Vivien Chen, Huei-Ru

AU - Chen, Zhiwei

AU - Ping Chen, Wen

AU - Chen, Mike

AU - Ching, Tao-Chung

AU - Cho, Jungyeon

AU - Choi, Minho

AU - Choi, Yunhee

AU - Chrysostomou, Antonio

AU - Dai, Sophia

AU - Dowell, C. Darren

AU - Duan, Hao-Yuan

AU - Duan, Yan

AU - Eden, David

AU - Eswaraiah, Chakali

AU - Eyres, Stewart

AU - Fiege, Jason

AU - Fissel, Laura M.

AU - Franzmann, Erica

AU - Friberg, Per

AU - Friesen, Rachel

AU - Fuller, Gary

AU - Gledhill, Tim

AU - Graves, Sarah

AU - Greaves, Jane

AU - Griffin, Matt

AU - Gu, Qilao

AU - Han, Ilseung

AU - Hatchell, Jannifer

AU - Hayashi, Saeko

AU - Houde, Martin

AU - Inoue, Tsuyoshi

AU - Inutsuka, Shu-ichiro

AU - Iwasaki, Kazunari

AU - Jeong, Il-Gyo

AU - Kang, Miju

AU - Kataoka, Akimasa

AU - Kawabata, Koji

AU - Kemper, Francisca

AU - Kim, Gwanjeong

AU - Kim, Mi-Ryang

AU - Kim, Shinyoung

AU - Kim, Kyoung Hee

AU - Kirk, Jason

AU - Kobayashi, Masato I. N.

AU - Könyves, Vera

AU - Kusune, Takayoshi

AU - Kwon, Jungmi

AU - Lacaille, Kevin

AU - Lai, Shih-Ping

AU - Law, Chi-Yan

AU - Lee, Jeong-Eun

AU - Lee, Yong-Hee

AU - Lee, Hyeseung

AU - Li, Dalei

AU - Li, Di

AU - Li, Hua-Bai

AU - Liu, Hong-Li

AU - Liu, Junhao

AU - Liu, Sheng-Yuan

AU - Lu, Xing

AU - Matsumura, Masafumi

AU - Matthews, Brenda

AU - Moriarty-Schieven, Gerald

AU - Nagata, Tetsuya

AU - Nakamura, Fumitaka

AU - Nakanishi, Hiroyuki

AU - Bich Ngoc, Nguyen

AU - Ohashi, Nagayoshi

AU - Parsons, Harriet

AU - Peretto, Nicolas

AU - Priestley, Felix

AU - Pyo, Tae-soo

AU - Qian, Lei

AU - Qiu, Keping

AU - Rao, Ramprasad

AU - Rawlings, Jonathan

AU - Rawlings, Mark G.

AU - Retter, Brendan

AU - Richer, John

AU - Rigby, Andrew

AU - Saito, Hiro

AU - Savini, Giorgio

AU - Scaife, Anna

AU - Seta, Masumichi

AU - Shimajiri, Yoshito

AU - Shinnaga, Hiroko

AU - Tahani, Mehrnoosh

AU - Tang, Ya-Wen

AU - Tomisaka, Kohji

AU - Tram, Le Ngoc

AU - Tsukamoto, Yusuke

AU - Viti, Serena

AU - Wang, Jia-Wei

AU - Wang, Hongchi

AU - Xie, Jinjin

AU - Yen, Hsi-Wei

AU - Yuan, Jinghua

AU - Yun, Hyeong-Sik

AU - Zenko, Tetsuya

AU - Zhang, Guoyin

AU - Zhang, Chuan-Peng

AU - Zhang, Yapeng

AU - Zhou, Jianjun

AU - Zhu, Lei

AU - de Looze, Ilse

AU - Falle, Sam

AU - Robitaille, Jean-François

AU - van Loo, Sven

PY - 2021/9

Y1 - 2021/9

N2 - Abstract: We present the results of simultaneous 450 μm and 850 μm polarization observations toward the massive star-forming region NGC 2071IR, a target of the BISTRO (B-fields in STar-forming Region Observations) Survey, using the POL-2 polarimeter and SCUBA-2 camera mounted on the James Clerk Maxwell Telescope. We find a pinched magnetic field morphology in the central dense core region, which could be due to a rotating toroidal disklike structure and a bipolar outflow originating from the central young stellar object IRS 3. Using the modified Davis–Chandrasekhar–Fermi method, we obtain a plane-of-sky magnetic field strength of 563 ± 421 μG in the central ∼0.12 pc region from 850 μm polarization data. The corresponding magnetic energy density of 2.04 × 10−8 erg cm−3 is comparable to the turbulent and gravitational energy densities in the region. We find that the magnetic field direction is very well aligned with the whole of the IRS 3 bipolar outflow structure. We find that the median value of polarization fractions is 3.0% at 450 μm in the central 3′ region, which is larger than the median value of 1.2% at 850 μm. The trend could be due to the better alignment of warmer dust in the strong radiation environment. We also find that polarization fractions decrease with intensity at both wavelengths, with slopes, determined by fitting a Rician noise model of 0.59 ± 0.03 at 450 μm and 0.36 ± 0.04 at 850 μm, respectively. We think that the shallow slope at 850 μm is due to grain alignment at the center being assisted by strong radiation from the central young stellar objects.

AB - Abstract: We present the results of simultaneous 450 μm and 850 μm polarization observations toward the massive star-forming region NGC 2071IR, a target of the BISTRO (B-fields in STar-forming Region Observations) Survey, using the POL-2 polarimeter and SCUBA-2 camera mounted on the James Clerk Maxwell Telescope. We find a pinched magnetic field morphology in the central dense core region, which could be due to a rotating toroidal disklike structure and a bipolar outflow originating from the central young stellar object IRS 3. Using the modified Davis–Chandrasekhar–Fermi method, we obtain a plane-of-sky magnetic field strength of 563 ± 421 μG in the central ∼0.12 pc region from 850 μm polarization data. The corresponding magnetic energy density of 2.04 × 10−8 erg cm−3 is comparable to the turbulent and gravitational energy densities in the region. We find that the magnetic field direction is very well aligned with the whole of the IRS 3 bipolar outflow structure. We find that the median value of polarization fractions is 3.0% at 450 μm in the central 3′ region, which is larger than the median value of 1.2% at 850 μm. The trend could be due to the better alignment of warmer dust in the strong radiation environment. We also find that polarization fractions decrease with intensity at both wavelengths, with slopes, determined by fitting a Rician noise model of 0.59 ± 0.03 at 450 μm and 0.36 ± 0.04 at 850 μm, respectively. We think that the shallow slope at 850 μm is due to grain alignment at the center being assisted by strong radiation from the central young stellar objects.

KW - 320

KW - Interstellar Matter and the Local Universe

U2 - 10.3847/1538-4357/ac0ce9

DO - 10.3847/1538-4357/ac0ce9

M3 - Article

SN - 0004-637X

VL - 918

SP - 85

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 2

ER -

The JCMT BISTRO Survey: An 850/450 μ m Polarization Study of NGC 2071IR in Orion B

Abstract

Keywords

Access to Document

Fingerprint

Cite this