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Title:
The first ALMA view of IRAS 16293-2422. Direct detection of infall onto source B and high-resolution kinematics of source A
Authors:
Pineda, J. E.; Maury, A. J.; Fuller, G. A.; Testi, L.; García-Appadoo, D.; Peck, A. B.; Villard, E.; Corder, S. A.; van Kempen, T. A.; Turner, J. L.; Tachihara, K.; Dent, W.
Affiliation:
AA(European Southern Observatory (ESO), Garching, Germany ; UK ARC Node, Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UK), AB(European Southern Observatory (ESO), Garching, Germany), AC(UK ARC Node, Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UK), AD(European Southern Observatory (ESO), Garching, Germany; INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125, Firenze, Italy), AE(European Southern Observatory, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago 19, Chile; Joint ALMA Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile), AF(Joint ALMA Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile; North American ALMA Science Center, National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA, 22903, USA), AG(Joint ALMA Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile), AH(North American ALMA Science Center, National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA, 22903, USA), AI(Joint ALMA Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile; Leiden Observatory, Leiden University, PO Box 9513, 2300 RA, Leiden, The Netherlands), AJ(Department of Physics and Astronomy, UCLA, Los Angeles, CA, 90095, USA), AK(Joint ALMA Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile; National Astronomical Observatory of Japan, Chile Observatory, 2-21-1 Osawa Mitaka, 181-8588, Tokyo, Japan), AL(Joint ALMA Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile)
Publication:
Astronomy & Astrophysics, Volume 544, id.L7, 6 pp. (A&A Homepage)
Publication Date:
08/2012
Origin:
EDP Sciences
Astronomy Keywords:
ISM: individual objects: IRAS 16293-2422, ISM: clouds, stars: formation, ISM: molecules
DOI:
10.1051/0004-6361/201219589
Bibliographic Code:
2012A&A...544L...7P

Abstract


Aims: We focus on the kinematical properties of a proto-binary to study the infall and rotation of gas toward its two protostellar components.
Methods: We present ALMA Science Verification observations with high-spectral resolution of IRAS 16293-2422 at 220.2 GHz. The wealth of molecular lines in this source and the very high spectral resolution offered by ALMA allow us to study the gas kinematics with unprecedented detail.
Results: We present the first detection of an inverse P-Cygni profile toward source B in the three brightest lines. The line profiles are fitted with a simple two-layer model to derive an infall rate of 4.5 × 10-5 M&sun; yr-1. This infall detection would rule-out the previously suggested possibility that source B is a T Tauri star. A position velocity diagram for source A shows evidence of rotation with an axis close to the line-of-sight.

Appendices are available in electronic form at http://www.aanda.orgContinuum and spectral data are available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/544/L7


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