Unveiling the role of the magnetic field at the smallest scales of star formation
We report ALMA observations of polarized dust emission from the protostellar source Ser-emb 8 at a linear resolution of 140 au. Assuming models of dust-grain alignment hold, the observed polarization pattern gives a projected view of the magnetic field structure in this source. Contrary to expectati...
Gespeichert in:
| Hauptverfasser: | , |
|---|---|
| Dokumenttyp: | Article (Journal) Kapitel/Artikel |
| Sprache: | Englisch |
| Veröffentlicht: |
2017
|
| In: |
Arxiv
|
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://arxiv.org/abs/1706.03806
|
| Verfasserangaben: | Charles L.H. Hull, Philip Mocz, Blakesley Burkhart, Alyssa A. Goodman, Josep M. Girart, Paulo C. Cortés, Lars Hernquist, Volker Springel, Zhi-Yun Li, and Shih-Ping Lai |
MARC
| LEADER | 00000caa a2200000 c 4500 | ||
|---|---|---|---|
| 001 | 1564571041 | ||
| 003 | DE-627 | ||
| 005 | 20220814004433.0 | ||
| 007 | cr uuu---uuuuu | ||
| 008 | 171019s2017 xx |||||o 00| ||eng c | ||
| 035 | |a (DE-627)1564571041 | ||
| 035 | |a (DE-576)494571047 | ||
| 035 | |a (DE-599)BSZ494571047 | ||
| 035 | |a (OCoLC)1340980628 | ||
| 040 | |a DE-627 |b ger |c DE-627 |e rda | ||
| 041 | |a eng | ||
| 084 | |a 29 |2 sdnb | ||
| 100 | 1 | |a Hull, Charles L. H. |e VerfasserIn |4 aut | |
| 245 | 1 | 0 | |a Unveiling the role of the magnetic field at the smallest scales of star formation |c Charles L.H. Hull, Philip Mocz, Blakesley Burkhart, Alyssa A. Goodman, Josep M. Girart, Paulo C. Cortés, Lars Hernquist, Volker Springel, Zhi-Yun Li, and Shih-Ping Lai |
| 264 | 1 | |c 2017 | |
| 300 | |a 11 | ||
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a Computermedien |b c |2 rdamedia | ||
| 338 | |a Online-Ressource |b cr |2 rdacarrier | ||
| 500 | |a Gesehen am 19.10.2017 | ||
| 520 | |a We report ALMA observations of polarized dust emission from the protostellar source Ser-emb 8 at a linear resolution of 140 au. Assuming models of dust-grain alignment hold, the observed polarization pattern gives a projected view of the magnetic field structure in this source. Contrary to expectations based on models of strongly magnetized star formation, the magnetic field in Ser-emb 8 does not exhibit an hourglass morphology. Combining the new ALMA data with previous observational studies, we can connect magnetic field structure from protostellar core (~80,000 au) to disk (~100 au) scales. We compare our observations with four magnetohydrodynamic gravo-turbulence simulations made with the AREPO code that have initial conditions ranging from super-Alfv\'enic (weakly magnetized) to sub-Alfv\'enic (strongly magnetized). These simulations achieve the spatial dynamic range necessary to resolve the collapse of protostars from the parsec scale of star-forming clouds down to the ~100 au scale probed by ALMA. Only in the very strongly magnetized simulation do we see both the preservation of the field direction from cloud to disk scales and an hourglass-shaped field at < 1000 au scales. We conduct an analysis of the relative orientation of the magnetic field and the density structure in both the Ser-emb 8 ALMA observations and the synthetic observations of the four AREPO simulations. We conclude that the Ser-emb 8 data are most similar to the weakly magnetized simulations, which exhibit random alignment, in contrast to the strongly magnetized simulation, where the magnetic field plays a role in shaping the density structure in the source. In the weak-field case, it is turbulence -- not the magnetic field -- that shapes the material that forms the protostar, highlighting the dominant role that turbulence can play across many orders of magnitude in spatial scale. | ||
| 650 | 4 | |a Astrophysics - Astrophysics of Galaxies | |
| 650 | 4 | |a Astrophysics - Solar and Stellar Astrophysics | |
| 700 | 1 | |a Springel, Volker |d 1970- |e VerfasserIn |0 (DE-588)122321391 |0 (DE-627)705861503 |0 (DE-576)293218463 |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t Arxiv |d Ithaca, NY : Cornell University, 1991 |g (2017) Artikel-Nummer 1706.03806, 11 Seiten |h Online-Ressource |w (DE-627)509006531 |w (DE-600)2225896-6 |w (DE-576)28130436X |7 nnas |a Unveiling the role of the magnetic field at the smallest scales of star formation |
| 773 | 1 | 8 | |g year:2017 |g extent:11 |a Unveiling the role of the magnetic field at the smallest scales of star formation |
| 856 | 4 | 0 | |u http://arxiv.org/abs/1706.03806 |x Verlag |z kostenfrei |3 Volltext |
| 951 | |a AR | ||
| 992 | |a 20171019 | ||
| 993 | |a Article | ||
| 998 | |g 122321391 |a Springel, Volker |m 122321391:Springel, Volker |d 700000 |d 714000 |d 714100 |e 700000PS122321391 |e 714000PS122321391 |e 714100PS122321391 |k 0/700000/ |k 1/700000/714000/ |k 2/700000/714000/714100/ |p 8 | ||
| 999 | |a KXP-PPN1564571041 |e 2984665910 | ||
| BIB | |a Y | ||
| JSO | |a {"name":{"displayForm":["Charles L.H. Hull, Philip Mocz, Blakesley Burkhart, Alyssa A. Goodman, Josep M. Girart, Paulo C. Cortés, Lars Hernquist, Volker Springel, Zhi-Yun Li, and Shih-Ping Lai"]},"id":{"eki":["1564571041"]},"origin":[{"dateIssuedDisp":"2017","dateIssuedKey":"2017"}],"relHost":[{"language":["eng"],"recId":"509006531","disp":"Unveiling the role of the magnetic field at the smallest scales of star formationArxiv","note":["Gesehen am 28.05.2024"],"type":{"media":"Online-Ressource","bibl":"edited-book"},"part":{"extent":"11","text":"(2017) Artikel-Nummer 1706.03806, 11 Seiten","year":"2017"},"titleAlt":[{"title":"Arxiv.org"},{"title":"Arxiv.org e-print archive"},{"title":"Arxiv e-print archive"},{"title":"De.arxiv.org"}],"pubHistory":["1991 -"],"title":[{"title_sort":"Arxiv","title":"Arxiv"}],"physDesc":[{"extent":"Online-Ressource"}],"id":{"eki":["509006531"],"zdb":["2225896-6"]},"origin":[{"publisherPlace":"Ithaca, NY ; [Erscheinungsort nicht ermittelbar]","publisher":"Cornell University ; Arxiv.org","dateIssuedKey":"1991","dateIssuedDisp":"1991-"}]}],"physDesc":[{"extent":"11 S."}],"person":[{"role":"aut","display":"Hull, Charles L. H.","roleDisplay":"VerfasserIn","given":"Charles L. H.","family":"Hull"},{"given":"Volker","family":"Springel","role":"aut","display":"Springel, Volker","roleDisplay":"VerfasserIn"}],"title":[{"title":"Unveiling the role of the magnetic field at the smallest scales of star formation","title_sort":"Unveiling the role of the magnetic field at the smallest scales of star formation"}],"language":["eng"],"recId":"1564571041","type":{"bibl":"chapter","media":"Online-Ressource"},"note":["Gesehen am 19.10.2017"]} | ||
| SRT | |a HULLCHARLEUNVEILINGT2017 | ||