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Title: Alignment between Protostellar Outflows and Filamentary Structure

Abstract

We present new Submillimeter Array (SMA) observations of CO(2–1) outflows toward young, embedded protostars in the Perseus molecular cloud as part of the Mass Assembly of Stellar Systems and their Evolution with the SMA (MASSES) survey. For 57 Perseus protostars, we characterize the orientation of the outflow angles and compare them with the orientation of the local filaments as derived from Herschel observations. We find that the relative angles between outflows and filaments are inconsistent with purely parallel or purely perpendicular distributions. Instead, the observed distribution of outflow-filament angles are more consistent with either randomly aligned angles or a mix of projected parallel and perpendicular angles. A mix of parallel and perpendicular angles requires perpendicular alignment to be more common by a factor of ∼3. Our results show that the observed distributions probably hold regardless of the protostar’s multiplicity, age, or the host core’s opacity. These observations indicate that the angular momentum axis of a protostar may be independent of the large-scale structure. We discuss the significance of independent protostellar rotation axes in the general picture of filament-based star formation.

Authors:
; ; ; ; ; ;  [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10]
  1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA (United States)
  2. Institute of Fluid Mechanics and Heat Transfer, TU Wien, Vienna, A-1060 (Austria)
  3. Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, 440 W. Brooks Street, Norman, OK 73019 (United States)
  4. Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, 85748 Garching (Germany)
  5. Department of Astronomy, University of Massachusetts, Amherst, MA 01003 (United States)
  6. Centre for Star and Planet Formation, Niels Bohr Institute and Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5-7, DK-1350 Copenhagen K (Denmark)
  7. Niels Bohr Institute and Center for Star and Planet Formation, Copenhagen University, DK-1350 Copenhagen K. (Denmark)
  8. SKA Organization, Jodrell Bank Observatory, Lower Withington, Macclesfield, Cheshire SK11 9DL (United Kingdom)
  9. Department of Astronomy, Yale University, New Haven, CT 06520 (United States)
  10. European Southern Observatory, Av. Alonso de Cordova 3107, Vitacura, Santiago de Chile (Chile)
Publication Date:
OSTI Identifier:
22663196
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 846; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANGULAR MOMENTUM; CARBON; CARBON MONOXIDE; COMPARATIVE EVALUATIONS; COSMIC GASES; DISTRIBUTION; EVOLUTION; FILAMENTS; GALAXIES; INTERSTELLAR SPACE; MASS; MULTIPLICITY; OPACITY; PROTOSTARS; RANDOMNESS; ROTATION; STARS

Citation Formats

Stephens, Ian W., Dunham, Michael M., Myers, Philip C., Pokhrel, Riwaj, Sadavoy, Sarah I., Lee, Katherine I., Goodman, Alyssa A., Vorobyov, Eduard I., Tobin, John J., Pineda, Jaime E., Offner, Stella S. R., Kristensen, Lars E., Jørgensen, Jes K., Bourke, Tyler L., Arce, Héctor G., and Plunkett, Adele L., E-mail: ian.stephens@cfa.harvard.edu. Alignment between Protostellar Outflows and Filamentary Structure. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA8262.
Stephens, Ian W., Dunham, Michael M., Myers, Philip C., Pokhrel, Riwaj, Sadavoy, Sarah I., Lee, Katherine I., Goodman, Alyssa A., Vorobyov, Eduard I., Tobin, John J., Pineda, Jaime E., Offner, Stella S. R., Kristensen, Lars E., Jørgensen, Jes K., Bourke, Tyler L., Arce, Héctor G., & Plunkett, Adele L., E-mail: ian.stephens@cfa.harvard.edu. Alignment between Protostellar Outflows and Filamentary Structure. United States. doi:10.3847/1538-4357/AA8262.
Stephens, Ian W., Dunham, Michael M., Myers, Philip C., Pokhrel, Riwaj, Sadavoy, Sarah I., Lee, Katherine I., Goodman, Alyssa A., Vorobyov, Eduard I., Tobin, John J., Pineda, Jaime E., Offner, Stella S. R., Kristensen, Lars E., Jørgensen, Jes K., Bourke, Tyler L., Arce, Héctor G., and Plunkett, Adele L., E-mail: ian.stephens@cfa.harvard.edu. Fri . "Alignment between Protostellar Outflows and Filamentary Structure". United States. doi:10.3847/1538-4357/AA8262.
@article{osti_22663196,
title = {Alignment between Protostellar Outflows and Filamentary Structure},
author = {Stephens, Ian W. and Dunham, Michael M. and Myers, Philip C. and Pokhrel, Riwaj and Sadavoy, Sarah I. and Lee, Katherine I. and Goodman, Alyssa A. and Vorobyov, Eduard I. and Tobin, John J. and Pineda, Jaime E. and Offner, Stella S. R. and Kristensen, Lars E. and Jørgensen, Jes K. and Bourke, Tyler L. and Arce, Héctor G. and Plunkett, Adele L., E-mail: ian.stephens@cfa.harvard.edu},
abstractNote = {We present new Submillimeter Array (SMA) observations of CO(2–1) outflows toward young, embedded protostars in the Perseus molecular cloud as part of the Mass Assembly of Stellar Systems and their Evolution with the SMA (MASSES) survey. For 57 Perseus protostars, we characterize the orientation of the outflow angles and compare them with the orientation of the local filaments as derived from Herschel observations. We find that the relative angles between outflows and filaments are inconsistent with purely parallel or purely perpendicular distributions. Instead, the observed distribution of outflow-filament angles are more consistent with either randomly aligned angles or a mix of projected parallel and perpendicular angles. A mix of parallel and perpendicular angles requires perpendicular alignment to be more common by a factor of ∼3. Our results show that the observed distributions probably hold regardless of the protostar’s multiplicity, age, or the host core’s opacity. These observations indicate that the angular momentum axis of a protostar may be independent of the large-scale structure. We discuss the significance of independent protostellar rotation axes in the general picture of filament-based star formation.},
doi = {10.3847/1538-4357/AA8262},
journal = {Astrophysical Journal},
number = 1,
volume = 846,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 2017},
month = {Fri Sep 01 00:00:00 EDT 2017}
}