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arxiv: 1206.5215 · v2 · pith:T4C6FPWHnew · submitted 2012-06-22 · 🌌 astro-ph.GA

The first ALMA view of IRAS 16293-2422: Direct detection of infall onto source B and high-resolution kinematics of source A

Jaime E. Pineda (1 , 2) , Ana\"elle J. Maury (1) , Gary A. Fuller (2) , Leonardo Testi (1 , 3) , Diego Garc\'ia-Appadoo (4 , 5)
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Alison B. Peck (5 6) Eric Villard (5) Stuartt A. Corder (6) Tim A. van Kempen (5 7) Jean L. Turner (8) Kengo Tachihara (5 9) William Dent (5) ((1) European Southern Observatory (ESO) Garching Germany (2) UK ARC Node Jodrell Bank Centre for Astrophysics School of Physics Astronomy University of Manchester Manchester UK (3) INAF-Osservatorio astrofisico di Arcetri Firenze Italy (4) European Southern Observatory Vitacura Santiago Chile (5) Joint ALMA Observatory (6) North American ALMA Science Center National Radio Astronomy Observatory Charlottesville VA USA (7) Leiden Observatory Leiden University Leiden The Netherlands (8) Department of Physics UCLA Los Angeles CA (9) National Astronomical Observatory of Japan Chile Observatory Tokyo Japan)
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classification 🌌 astro-ph.GA
keywords sourceinfallalmadetectionfirstiraskinematicslines
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Aims: We focus on the kinematical properties of a proto-binary to study the infall and rotation of gas towards 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 towards source B in the three brightest lines. The line profiles are fitted with a simple two-layer model to derive an infall rate of 4.5x10^-5 Msun/yr. 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 for rotation with an axis close to the line-of-sight.

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