Zobrazeno 1 - 10
of 192
pro vyhledávání: '"Stephens, Ian W."'
Autor:
Dunham, Michael M., Stephens, Ian W., Myers, Philip C., Bourke, Tyler L., Arce, Héctor G., Pokhrel, Riwaj, Pineda, Jaime E., Vargas, Joseph
We use 1-4" (300-1200 au) resolution 12CO(2-1) data from the MASSES (Mass Assembly of Stellar Systems and their Evolution with the SMA) project to measure the projected opening angles of 46 protostellar outflows in the Perseus Molecular Cloud, 37 of
Externí odkaz:
http://arxiv.org/abs/2408.12788
Autor:
Zapata, Luis A., Fernández-López, Manuel, Sanhueza, Patricio, Girart, Josep M., Rodríguez, Luis F., Cortes, Paulo, Patrick, Koch, Beltrán, María T., Pattle, Kate, Beuther, Henrik, Saha, Piyali, Jiao, Wenyu, Xu, Fengwei, Lu, Xing Walker, Olguin, Fernando, Li, Shanghuo, Stephens, Ian W., Kang, Ji-hyun, Cheng, Yu, Choudhury, Spandan, Morii, Kaho, Chung, Eun Jung, Wang, Jia-Wei, Hwang, Jihye, Lyo, A-Ran, Zhang, Qizhou, Chen, Huei-Ru Vivien
The formation of the massive stars, and in particular, the role that the magnetic fields play in their early evolutionary phase is still far from being completely understood. Here, we present Atacama Large Millimeter/Submillimeter Array (ALMA) 1.2 mm
Externí odkaz:
http://arxiv.org/abs/2408.10199
Autor:
Saha, Piyali, Sanhueza, Patricio, Padovani, Marco, Girart, Josep M., Cortes, Paulo, Morii, Kaho, Liu, Junhao, Sanchez-Monge, A., Galli, Daniele, Basu, Shantanu, Koch, Patrick M., Beltran, Maria T., Li, Shanghuo, Beuther, Henrik, Stephens, Ian W., Nakamura, Fumitaka, Zhang, Qizhou, Jiao, Wenyu, Fernandez-Lopez, M., Hwang, Jihye, Chung, Eun Jung, Pattle, Kate, Zapata, Luis A., Xu, Fengwei, Olguin, Fernando A., Kang, Ji-hyun, Karoly, Janik, Law, Chi-Yan, Wang, Jia-Wei, Csengeri, Timea, Lu, Xing, Cheng, Yu, Kim, Jongsoo, Choudhury, Spandan, Chen, Huei-Ru Vivien, Hull, Charles L. H.
The contribution of the magnetic field to the formation of high-mass stars is poorly understood. We report the high-angular resolution ($\sim0.3^{\prime\prime}$, 870 au) map of the magnetic field projected on the plane of the sky (B$_\mathrm{POS}$) t
Externí odkaz:
http://arxiv.org/abs/2407.16654
Autor:
Lin, Zhe-Yu Daniel, Li, Zhi-Yun, Yang, Haifeng, Looney, Leslie W., Stephens, Ian W., Fernández-López, Manuel, Harrison, Rachel E.
Recent (sub)millimeter polarization observations of protoplanetary disks reveal toroidally aligned, effectively prolate dust grains large enough (at least ~100 $\mu$m) to efficiently scatter millimeter light. The alignment mechanism for these grains
Externí odkaz:
http://arxiv.org/abs/2407.10025
Autor:
Cortes, Paulo C., Girart, Josep M., Sanhueza, Patricio, Liu, Junhao, Martin, Sergio, Stephens, Ian W., Beuther, Henrik, Koch, Patrick M., Fernandez-Lopez, M., Sanchez-Monge, Alvaro, Wang, Jia-Wei, Morii, Kaho, Li, Shanghuo, Saha, Piyali, Zhang, Qizhou, Rebolledo, David, Zapata, Luis A., Kang, Ji-hyun, Jiao, Wenyu, Kim, Jongsoo, Cheng, Yu, Hwang, Jihye, Chung, Eun Jung, Choudhury, Spandan, Lyo, A-Ran, Olguin, Fernando
We report on ALMA observations of polarized dust emission at 1.2 mm from NGC6334I, a source known for its significant flux outbursts. Between five months, our data show no substantial change in total intensity and a modest 8\% variation in linear pol
Externí odkaz:
http://arxiv.org/abs/2406.14663
Autor:
Sadavoy, Sarah I, Sheehan, Patrick, Tobin, John J., Murillo, Nadia M., Teague, Richard, Stephens, Ian W., Henning, Thomas, Myers, Philip C., Bergin, Edwin A.
Publikováno v:
A&A 687, A308 (2024)
We present ALMA Band 7 molecular line observations of the protostars within the VLA 1623 system. We map C$^{17}$O (3 - 2) in the circumbinary disk around VLA 1623A and the outflow cavity walls of the collimated outflow. We further detect red-shifted
Externí odkaz:
http://arxiv.org/abs/2406.12984
Autor:
Yang, Haifeng, Fernández-López, Manuel, Li, Zhi-Yun, Stephens, Ian W., Looney, Leslie W., Lin, Zhe-Yu Daniel, Harrison, Rachel
We investigate the crescent-shaped dust trap in the transition disk, Oph IRS 48, using well-resolved (sub)millimeter polarimetric observations at ALMA Band 7 (870 $\mu$m). The dust polarization map reveals patterns consistent with dust scattering-ind
Externí odkaz:
http://arxiv.org/abs/2402.12662
Autor:
Huang, Bo, Girart, Josep M., Stephens, Ian W., Fernandez-Lopez, Manuel, Arce, Hector G., Carpenter, John M., Cortes, Paulo, Cox, Erin G., Friesen, Rachel, Gouellec, Valentin J. M. Le, Hull, Charles L. H., Karnath, Nicole, Kwon, Woojin, Li, Zhi-Yun, Looney, Leslie W., Megeath, Tom, Myers, Philip C., Murillo, Nadia M., Pineda, Jaime E., Sadavoy, Sarah, Sanchez-Monge, Alvaro, Sanhueza, Patricio, Tobin, John J., Zhang, Qizhou, Jackson, James M., Segura-Cox, Dominique
Publikováno v:
ApJL, 963:L31, 2024
We present 870 um polarimetric observations toward 61 protostars in the Orion molecular clouds, with ~400 au (1") resolution using the Atacama Large Millimeter/submillimeter Array. We successfully detect dust polarization and outflow emission in 56 p
Externí odkaz:
http://arxiv.org/abs/2402.07267
Autor:
Li, Shanghuo, Sanhueza, Patricio, Beuther, Henrik, Chen, Huei-Ru Vivien, Kuiper, Rolf, Olguin, Fernando A., Pudritz, Ralph E., Stephens, Ian W., Zhang, Qizhou, Nakamura, Fumitaka, Lu, Xing, Kuruwita, Rajika L., Sakai, Takeshi, Henning, Thomas, Taniguchi, Kotomi, Li, Fei
The dominant mechanism forming multiple stellar systems in the high-mass regime (M$_\ast \gtrsim $ 8 $M_{\odot}$) remained unknown because direct imaging of multiple protostellar systems at early phases of high-mass star formation is very challenging
Externí odkaz:
http://arxiv.org/abs/2401.06545
The Davis-Chandrasekhar-Fermi (DCF) method is widely used to evaluate magnetic fields in star-forming regions. Yet it remains unclear how well DCF equations estimate the mean plane-of-the-sky field strength in a map region. To address this question,
Externí odkaz:
http://arxiv.org/abs/2312.09330