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Title: | Star and jet multiplicity in the high-mass star forming region IRAS 05137+3919 | Authors: | CESARONI, Riccardo MASSI, Fabrizio ARCIDIACONO, CARMELO BELTRAN SOROLLA, MARIA TERESA Persi, P. Tapia, M. MOLINARI, Sergio BUSONI, LORENZO RICCARDI, Armando Boutsia, K. Bisogni, Susanna McCarthy, D. Kulesa, C. TESTI, Leonardo |
Issue Date: | 2015 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 581 | First Page: | A124 | Abstract: | Context. We present a study of the complex high-mass star forming region IRAS 05137+3919 (also known as Mol8), where multiple jets and a rich stellar cluster have been described in previous works. <BR /> Aims: Our goal is to determine the number of jets and shed light on their origin, and thus determine the nature of the young stars powering these jets. We also wish to analyse the stellar clusters by resolving the brightest group of stars. <BR /> Methods: The star forming region was observed in various tracers and the results were complemented with ancillary archival data. The new data represent a substantial improvement over previous studies both in resolution and frequency coverage. In particular, adaptive optics provides us with an angular resolution of 80 mas in the near IR, while new mid- and far-IR data allow us to sample the peak of the spectral energy distribution and thus reliably estimate the bolometric luminosity. <BR /> Results: Thanks to the near-IR continuum and millimetre line data we can determine the structure and velocity field of the bipolar jets and outflows in this star forming region. We also find that the stars are grouped into three clusters and the jets originate in the richest of these, whose luminosity is ~ 2.4 × 10<SUP>4</SUP>L<SUB>☉</SUB>. Interestingly, our high-resolution near-IR images allow us to resolve one of the two brightest stars (A and B) of the cluster into a double source (A1+A2). <BR /> Conclusions: We confirm that there are two jets and establish that they are powered by B-type stars belonging to cluster C1. On this basis and on morphological and kinematical arguments, we conclude that the less extended jet is almost perpendicular to the line of sight and that it originates in the brightest star of the cluster, while the more extended one appears to be associated with the more extincted, double source A1+A2. We propose that this is not a binary system, but a small bipolar reflection nebula at the root of the large-scale jet, outlining a still undetected circumstellar disk. The gas kinematics on a scale of ~0.2 pc seems to support our hypothesis, because it appears to trace rotation about the axis of the associated jet. <P />Based on observations carried out with the Large Binocular Telescope. The LBT is an international collaboration among institutions in the United States, Italy and Germany. LBT Corporation partners are: The University of Arizona on behalf of the Arizona university system; Istituto Nazionale di Astrofisica, Italy; LBT Beteiligungsgesellschaft, Germany, representing the Max-Planck Society, the Astrophysical Institute Potsdam, and Heidelberg University; The Ohio State University, and The Research Corporation, on behalf of The University of Notre Dame, University of Minnesota, and University of Virginia.Appendix A is available in electronic form at <A href="http://www.aanda.org/10.1051/0004-6361/201526199/olm">http://www.aanda.org</A> | Acknowledgments: | It is a pleasure to thank Francesca Bacciotti and Daniele Galli for instructive discussions on jets from YSOs. M.T. acknowledges support from UNAM/PAPIIT grant No. IN-101813. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. This publication also makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. | URI: | http://hdl.handle.net/20.500.12386/23412 | URL: | https://www.aanda.org/articles/aa/abs/2015/09/aa26199-15/aa26199-15.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201526199 | Bibcode ADS: | 2015A&A...581A.124C | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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