Carma large area star formation survey : dense gas in the young L1451 region of Perseus

• Autores: Storm, Shaye; Mundy, Lee G.; Lee, Katherine I.; Fernandez Lopez, Manuel; Looney, Leslie W.; Teuben, Peter; Arce, Héctor G.; Rosolowsky, Erik W.; Meisner, Aaron M.; Isella, Andrea; Kauffmann, Jens; Shirley, Yancy L.; Kwon, Woojin; Plunkett, Adele L.; Pound, Marc W.; Segura Cox, Dominique M.; Tassis, Konstantinos; Tobin, John J.; Volgenau, Nikolaus H.; Crutcher, Richard M.; Testi, Leonardo
• Año de publicación: 2016
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Clouds; Kinematics and dynamics; Molecules; Machine readeable tables; Star formation
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

We present a 3 mm spectral line and continuum survey of L1451 in the Perseus Molecular Cloud. These observations are from the CARMA Large Area Star Formation Survey (CLASSy), which also imaged Barnard 1, NGC 1333, Serpens Main, and Serpens South. L1451 is the survey region with the lowest level of star formation activity - it contains no confirmed protostars. HCO+, HCN, and N2H+ are all detected throughout the region, with HCO+ being the most spatially widespread, and molecular emission seen toward 90% of the area above N(H2) column densities of 1.9 1021 cm-2. HCO+ has the broadest velocity dispersion, near 0.3 km s-1 on average, compared with ∼0.15 km s-1 for the other molecules, thus representing a range of subsonic to supersonic gas motions. Our non-binary dendrogram analysis reveals that the dense gas traced by each molecule has a similar hierarchical structure, and that gas surrounding the candidate first hydrostatic core (FHSC), L1451-mm, and other previously detected single-dish continuum clumps has similar hierarchical structure; this suggests that different subregions of L1451 are fragmenting on the pathway to forming young stars. We determined that the three-dimensional morphology of the largest detectable dense-gas structures was relatively ellipsoidal compared with other CLASSy regions, which appeared more flattened at the largest scales. A virial analysis shows that the most centrally condensed dust structures are likely unstable against collapse. Additionally, we identify a new spherical, centrally condensed N2H+ feature that could be a new FHSC candidate. The overall results suggest that L1451 is a young region starting to form its generation of stars within turbulent, hierarchical structures.
Fil: Storm, Shaye. Harvard-Smithsonian Center for Astrophysics; Estados Unidos. University of Maryland; Estados Unidos
Fil: Mundy, Lee G.. University of Maryland; Estados Unidos
Fil: Lee, Katherine I.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos. University of Maryland; Estados Unidos
Fil: Fernandez Lopez, Manuel. University Of Illinois. Urbana - Champaign; Estados Unidos. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomia; Argentina
Fil: Looney, Leslie W.. University Of Illinois. Urbana - Champaign; Estados Unidos
Fil: Teuben, Peter. University of Maryland; Estados Unidos
Fil: Arce, Héctor G.. University of Yale; Estados Unidos
Fil: Rosolowsky, Erik W.. University of Alberta; Canadá
Fil: Meisner, Aaron M.. Lawrence Berkeley National Laboratory; Estados Unidos
Fil: Isella, Andrea. Rice University; Estados Unidos
Fil: Kauffmann, Jens. Max Planck Institut Fur Radioastronomie; Alemania
Fil: Shirley, Yancy L.. University of Arizona; Estados Unidos
Fil: Kwon, Woojin. Korea Astronomy And Space Science Institute; Corea del Sur
Fil: Plunkett, Adele L.. European Southern Observatory; Chile
Fil: Pound, Marc W.. University of Maryland; Estados Unidos
Fil: Segura Cox, Dominique M.. University Of Illinois. Urbana - Champaign; Estados Unidos
Fil: Tassis, Konstantinos. Foundation For Research And Technology; Grecia
Fil: Tobin, John J.. Leiden Observatory Research Institute; Países Bajos
Fil: Volgenau, Nikolaus H.. Las Cumbres Observatory Global Telescope Network; Estados Unidos
Fil: Crutcher, Richard M.. University Of Illinois. Urbana - Champaign; Estados Unidos
Fil: Testi, Leonardo. European Southern Observatory; Chile