Carma Large Area Star Formation Survey: project overview with analysis of dense gas structure and kinematics in barnard 1

• Autores: Storm, Shaye; Mundy, Lee G.; Fernandez Lopez, Manuel; Lee, Katherine I.; Looney, Leslie W.; Teuben, Peter; Rosolowsky, Erik W.; Arce, Héctor G.; Ostriker, Eve C.; Segura-Cox, Dominique M.; Pound, Marc W.; Salter, Demerese M.; Volgenau, Nikolaus H.; Shirley, Yancy L.; Chen, Che Yu; Gong, Hao; Plunkett, Adele L.; Tobin, John J.; Kwon, Woojin; Isella, Andrea; Kauffmann, Jens; Tassis, Konstantinos; Crutcher, Richard M.; Gammie, Charles F.; Testi, Leonardo
• Año de publicación: 2014
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Barnard 1; Interstellar Medium; Turbulence; CLASSy
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

We present details of the CARMA Large Area Star Formation Survey (CLASSy), while focusing on observations of Barnard 1. CLASSy is a CARMA Key Project that spectrally imaged N2H+, HCO+, and HCN (J = 1 → 0 transitions) across over 800 square arcminutes of the Perseus and Serpens Molecular Clouds. The observations have angular resolution near 7'' and spectral resolution near 0.16 km s–1. We imaged ~150 square arcminutes of Barnard 1, focusing on the main core, and the B1 Ridge and clumps to its southwest. N2H+ shows the strongest emission, with morphology similar to cool dust in the region, while HCO+ and HCN trace several molecular outflows from a collection of protostars in the main core. We identify a range of kinematic complexity, with N2H+ velocity dispersions ranging from ~0.05 to 0.50 km s–1 across the field. Simultaneous continuum mapping at 3 mm reveals six compact object detections, three of which are new detections. A new, non-binary dendrogram algorithm is used to analyze dense gas structures in the N2H+ position-position-velocity (PPV) cube. The projected sizes of dendrogram-identified structures range from about 0.01 to 0.34 pc. Size-linewidth relations using those structures show that non-thermal line-of-sight velocity dispersion varies weakly with projected size, while rms variation in the centroid velocity rises steeply with projected size. Comparing these relations, we propose that all dense gas structures in Barnard 1 have comparable depths into the sky, around 0.1-0.2 pc this suggests that overdense, parsec-scale regions within molecular clouds are better described as flattened structures rather than spherical collections of gas. Science-ready PPV cubes for Barnard 1 molecular emission are available for download.
Fil: Storm, Shaye . University of Maryland. Department of Astronomy; Estados Unidos
Fil: Mundy, Lee G. . University of Maryland. Department of Astronomy; Estados Unidos
Fil: Fernandez Lopez, Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto Argentino de Radioastronomia (i); Argentina
Fil: Lee, Katherine I. . University of Maryland. Department of Astronomy;; Estados Unidos
Fil: Looney, Leslie W. . University of Illinois, Urbana Department of Astronomy; Estados Unidos
Fil: Teuben, Peter . University of Maryland. Department of Astronomy; Estados Unidos
Fil: Rosolowsky, Erik W. . University of British Columbia. Departments of Physics and Statistics; Canadá
Fil: Arce, Héctor G. . Yale University. Department of Astronomy; Estados Unidos
Fil: Ostriker, Eve C. . Princeton University. Department of Astrophysical Sciences; Estados Unidos
Fil: Segura-Cox, Dominique M.. University of Illinois, Urbana. Department of Astronomy; Estados Unidos
Fil: Pound, Marc W. . University of Maryland. Department of Astronomy; Estados Unidos
Fil: Salter, Demerese M. . University of Maryland. Department of Astronomy; Estados Unidos
Fil: Volgenau, Nikolaus H. . Owens Valley Radio Observatory; Estados Unidos
Fil: Shirley, Yancy L. . Steward Observatory, Tucson; Estados Unidos
Fil: Chen, Che Yu . University of Maryland. Department of Astronomy; Estados Unidos
Fil: Gong, Hao . University of Maryland. Department of Astronomy; Estados Unidos
Fil: Plunkett, Adele L. . Yale University. Department of Astronomy; Estados Unidos
Fil: Tobin, John J. . National Radio Astronomy Observatory; Estados Unidos
Fil: Kwon, Woojin . SRON Netherlands Institute for Space Research; Países Bajos
Fil: Isella, Andrea . California Institute of Technology. Astronomy Department; Estados Unidos
Fil: Kauffmann, Jens . Max Planck Institut für Radioastronomie; Alemania
Fil: Tassis, Konstantinos . University of Crete. Department of Physics and Institute of Theoretical and Computational Physics; Grecia
Fil: Crutcher, Richard M. . University of Illinois, Urbana. Department of Astronomy; Estados Unidos
Fil: Gammie, Charles F. . University of Illinois, Urbana. Department of Astronomy; Estados Unidos
Fil: Testi, Leonardo . ESO, Karl-Schwarzschild-Strasse; Alemania