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Browsing by Author "Caselli, Paola"

Browsing by Author "Caselli, Paola"

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  • Are Massive Dense Clumps Truly Subvirial? A New Analysis Using Gould Belt Ammonia Data 
    Singh, Ayushi; Matzner, Christopher D.; Friesen, Rachel K.; Martin, Peter G.; Pineda, Jaime E.; Rosolowsky, Erik; Alves, Felipe; Chacón-Tanarro, Ana; Chen, Hope How-Huan; Chen, Michael Chun-Yuan; Choudhury, Spandan; Di Francesco, James; Keown, Jared; Kirk, Helen; Punanova, Anna; Seo, Youngmin; Shirley, Yancy; Ginsburg, Adam; Offner, Stella S. R.; Arce, Héctor G.; Caselli, Paola; Goodman, Alyssa A.; Myers, Philip C.; Redaelli, Elena; GAS Collaboration (2021)
    Dynamical studies of dense structures within molecular clouds often conclude that the most massive clumps contain too little kinetic energy for virial equilibrium, unless they are magnetized to an unexpected degree. This ...
  • The Central 1000 au of a Pre-stellar Core Revealed with ALMA. I. 1.3 mm Continuum Observations 
    Caselli, Paola; Pineda, Jaime E.; Zhao, Bo; Walmsley, Malcolm C.; Keto, Eric; Tafalla, Mario; Chacón-Tanarro, Ana; Bourke, Tyler L.; Friesen, Rachel; Galli, Daniele; Padovani, Marco (2019)
    Stars like our Sun form in self-gravitating dense and cold structures within interstellar clouds that are referred to as pre-stellar cores. Although much is known about the physical structure of dense clouds just before ...
  • Chemistry and radiative transfer of water in cold, dense clouds 
    Keto, Eric; Rawlings, Jonathan; Caselli, Paola (2014)
    The Herschel Space Observatory's recent detections of water vapour in the cold, dense cloud L1544 allow a direct comparison between observations and chemical models for oxygen species in conditions just before star ...
  • The CHESS spectral survey of star forming regions: Peering into the protostellar shock L1157-B1. II. Shock dynamics 
    Lefloch, B.; Cabrit, S.; Codella, C.; Melnick, Gary J.; Cernicharo, José; Caux, E.; Benedettini, M.; Boogert, Adwin; Caselli, Paola; Ceccarelli, C.; Gueth, F.; Hily-Blant, P.; Lorenzani, A.; Neufeld, David A.; Nisini, B.; Pacheco, S.; Pagani, L.; Pardo, J. R.; Parise, B.; Salez, M.; Schuster, K.; Viti, S.; Bacmann, A.; Baudry, A.; Bell, T.; Bergin, Edwin A.; Blake, Geoffrey A.; Bottinelli, Sandrine; Castets, A.; Comito, C.; Coutens, A.; Crimier, N.; Dominik, C.; Demyk, K.; Encrenaz, P.; Falgarone, E.; Fuente, A.; Gerin, M.; Goldsmith, P.; Helmich, F.; Hennebelle, P.; Henning, Thomas; Herbst, E.; Jacq, T.; Kahane, C.; Kama, M.; Klotz, A.; Langer, W.; Lis, Dariusz C.; Lord, S.; Maret, Sébastien; Pearson, J.; Phillips, T.; Saraceno, P.; Schilke, P.; Tielens, X.; van der Tak, Floris; van, der Wiel; Vastel, C.; Wakelam, V.; Walters, A.; Wyrowski, F.; Yorke, H.; Bachiller, R.; Borys, C.; de Lange, G.; Delorme, Y.; Kramer, C.; Larsson, B.; Lai, R.; Maiwald, F. W.; Martin-Pintado, J.; Mehdi, I.; Ossenkopf, V.; Siegel, P.; Stutzki, J.; Wunsch, J. H. (2010)
    Context. The outflow driven by the low-mass class 0 protostar L1157 is the prototype of the so-called chemically active outflows. The bright bowshock B1 in the southern outflow lobe is a privileged testbed of magneto-hyd ...
  • Deep observations of O2 toward a low-mass protostar with Herschel-HIFI 
    Yildiz, Umut A.; Acharyya, Kinsuk; Goldsmith, Paul F.; van Dishoeck, Ewine F.; Melnick, Gary; Snell, Ronald; Liseau, René; Chen, Jo-Hsin; Pagani, Laurent; Bergin, Edwin; Caselli, Paola; Herbst, Eric; Kristensen, Lars E.; Visser, Ruud; Lis, Dariusz C.; Gerin, Maryvonne (2013)
    Context. According to traditional gas-phase chemical models, O<SUB>2</SUB> should be abundant in molecular clouds, but until recently, attempts to detect interstellar O<SUB>2</SUB> line emission with ground- and space-based ...
  • Dense Cores in Perseus: The Influence of Stellar Content and Cluster Environment 
    Foster, Jonathan B.; Rosolowsky, Erik W.; Kauffmann, Jens; Pineda, Jaime E.; Borkin, Michelle A.; Caselli, Paola; Myers, Philip C.; Goodman, Alyssa A. (2009)
  • Dense Gas Kinematics and a Narrow Filament in the Orion A OMC1 Region Using NH3 
    Monsch, Kristina; Pineda, Jaime E.; Liu, Hauyu Baobab; Zucker, Catherine; How-Huan Chen, Hope; Pattle, Kate; Offner, Stella S. R.; Di Francesco, James; Ginsburg, Adam; Ercolano, Barbara; Arce, Héctor G.; Friesen, Rachel; Kirk, Helen; Caselli, Paola; Goodman, Alyssa A. (2018)
    We present combined observations of the {NH}}<SUB>3</SUB> (J, K) = (1, 1) and (2, 2) inversion transitions toward OMC1 in Orion A obtained by the Karl G. Jansky Very Large Array and the 100 m Robert C. Byrd Green Bank ...
  • Detection of interstellar oxidaniumyl: Abundant H<SUB>2</SUB>O<SUP> </SUP> towards the star-forming regions DR21, Sgr B2, and NGC6334 
    Ossenkopf, V.; Müller, H. S. P.; Lis, Dariusz C.; Schilke, P.; Bell, T. A.; Bruderer, S.; Bergin, Edwin A.; Ceccarelli, C.; Comito, C.; Stutzki, J.; Bacman, A.; Baudry, A.; Benz, A. O.; Benedettini, M.; Berne, O.; Blake, Geoffrey A.; Boogert, Adwin; Bottinelli, Sandrine; Boulanger, F.; Cabrit, S.; Caselli, Paola; Caux, E.; Cernicharo, José; Codella, C.; Coutens, A.; Crimier, N.; Crockett, N. R.; Daniel, F.; Demyk, K.; Dieleman, P.; Dominik, C.; Dubernet, M. L.; Emprechtinger, M.; Encrenaz, P.; Falgarone, E.; France, K.; Fuente, A.; Gerin, M.; Giesen, T. F.; di Giorgio, A. M.; Goicoechea, J. R.; Goldsmith, P. F.; Güsten, R.; Harris, A.; Helmich, F.; Herbst, E.; Hily-Blant, P.; Jacobs, K.; Jacq, T.; Joblin, Ch; Johnstone, D.; Kahane, C.; Kama, M.; Klein, T.; Klotz, A.; Kramer, C.; Langer, W.; Lefloch, B.; Leinz, C.; Lorenzani, A.; Lord, S. D.; Maret, Sébastien; Martin, Peter G.; Martin-Pintado, J.; McCoey, C.; Melchior, M.; Melnick, Gary J.; Menten, Karl M.; Mookerjea, B.; Morris, P.; Murphy, J. A.; Neufeld, David A.; Nisini, B.; Pacheco, S.; Pagani, L.; Parise, B.; Pearson, J. C.; Pérault, M.; Phillips, Thomas G.; Plume, R.; Quin, S. -L; Rizzo, R.; Röllig, M.; Salez, M.; Saraceno, P.; Schlemmer, S.; Simon, R.; Schuster, K.; van der Tak, Floris; Tielens, A. G. G. M.; Teyssier, D.; Trappe, N.; Vastel, C.; Viti, S.; Wakelam, V.; Walters, A.; Wang, S.; Whyborn, N.; van, der Wiel; Yorke, H. W.; Yu, S.; Zmuidzinas, J. (2010)
    Aims: We identify a prominent absorption feature at 1115 GHz, detected in first HIFI spectra towards high-mass star-forming regions, and interpret its astrophysical origin. Methods: The characteristic hyperfine pattern of ...
  • The Different Structures of the Two Classes of Starless Cores 
    Keto, Eric R.; Caselli, Paola (2008)
  • Dissecting the Supercritical Filaments Embedded in the 0.5 pc Subsonic Region of Barnard 5 
    Schmiedeke, Anika; Pineda, Jaime E.; Caselli, Paola; Arce, Héctor G.; Fuller, Gary A.; Goodman, Alyssa A.; Maureira, María José; Offner, Stella S. R.; Segura-Cox, Dominique; Seifried, Daniel (2021)
    We characterize in detail the two ~0.3 pc long filamentary structures found within the subsonic region of Barnard 5. We use combined Robert C. Byrd Green Bank Telescope and Very Large Array observations of the molecular ...
  • Droplets. I. Pressure-dominated Coherent Structures in L1688 and B18 
    Chen, Hope How-Huan; Pineda, Jaime E.; Goodman, Alyssa A.; Burkert, Andreas; Offner, Stella S. R.; Friesen, Rachel K.; Myers, Philip C.; Alves, Felipe; Arce, Héctor G.; Caselli, Paola; Chacón-Tanarro, Ana; Chen, Michael Chun-Yuan; Di Francesco, James; Ginsburg, Adam; Keown, Jared; Kirk, Helen; Martin, Peter G.; Matzner, Christopher; Punanova, Anna; Redaelli, Elena; Rosolowsky, Erik; Scibelli, Samantha; Seo, Youngmin; Shirley, Yancy; Singh, Ayushi; The GAS Collaboration (2019)
    We present the observation and analysis of newly discovered coherent structures in the L1688 region of Ophiuchus and the B18 region of Taurus. Using data from the Green Bank Ammonia Survey, we identify regions of high ...
  • Dynamics and depletion in thermally supercritical starless cores 
    Keto, Eric R.; Caselli, Paola (2010)
  • The dynamics of collapsing cores and star formation 
    Keto, Eric; Caselli, Paola; Rawlings, Jonathan (2015)
    Low-mass stars are understood to form by the gravitational collapse of the dense molecular clouds known as starless cores. However, it has proven impossible to use continuum observations to distinguish among the different ...
  • Efficient Methanol Production on the Dark Side of a Prestellar Core 
    Harju, Jorma; Pineda, Jaime E.; Vasyunin, Anton I.; Caselli, Paola; Offner, Stella S. R.; Goodman, Alyssa A.; Juvela, Mika; Sipilä, Olli; Faure, Alexandre; Le Gal, Romane; Hily-Blant, Pierre; Alves, João; Bizzocchi, Luca; Burkert, Andreas; Chen, Hope; Friesen, Rachel K.; Güsten, Rolf; Myers, Philip C.; Punanova, Anna; Rist, Claire; Rosolowsky, Erik; Schlemmer, Stephan; Shirley, Yancy; Spezzano, Silvia; Vastel, Charlotte; Wiesenfeld, Laurent (2020)
    We present Atacama Large Millimeter/submillimeter Array maps of the starless molecular cloud core Ophiuchus/H-MM1 in the lines of deuterated ammonia (ortho- ${\mathrm{NH}}_{2}{\rm{D}}$ ), methanol ( ${\mathrm{CH}}_{3}\mathrm{OH}$ ...
  • First Detection of Water Vapor in a Pre-stellar Core 
    Caselli, Paola; Keto, Eric; Bergin, Edwin A.; Tafalla, Mario; Aikawa, Yuri; Douglas, Thomas; Pagani, Laurent; Yíldíz, Umut A.; van der Tak, Floris; Walmsley, C. M.; Codella, Claudio; Nisini, Brunella; Kristensen, Lars E.; van Dishoeck, Ewine F. (2012)
    Water is a crucial molecule in molecular astrophysics as it controls much of the gas/grain chemistry, including the formation and evolution of more complex organic molecules in ices. Pre-stellar cores provide the original ...
  • The formation of a quadruple star system with wide separation 
    Pineda, Jaime E.; Offner, Stella S. R.; Parker, Richard J.; Arce, Héctor G.; Goodman, Alyssa A.; Caselli, Paola; Fuller, Gary A.; Bourke, Tyler L.; Corder, Stuartt A. (2015)
    The initial multiplicity of stellar systems is highly uncertain. A number of mechanisms have been proposed to explain the origin of binary and multiple star systems, including core fragmentation, disk fragmentation and ...
  • Four annular structures in a protostellar disk less than 500,000 years old 
    Segura-Cox, Dominique; Schmiedeke, Anika; Pineda, Jaime E.; Stephens, Ian W.; Fernández-López, Manuel; Looney, Leslie W.; Caselli, Paola; Li, Zhi-Yun; Mundy, Lee G.; Kwon, Woojin; Harris, Robert J. (2020)
  • Gas phase detection and rotational spectroscopy of ethynethiol, HCCSH 
    Lee, Kin Long Kelvin; Martin-Drumel, Marie-Aline; Lattanzi, Valerio; McGuire, Brett A.; Caselli, Paola; McCarthy, Michael C. (2019)
    We report the gas-phase detection and spectroscopic characterisation of ethynethiol (?), a metastable isomer of thioketene (?) using a combination of Fourier-transform microwave and submillimetre-wave spectroscopies. Several ...
  • The Green Bank Ammonia Survey: Dense Cores under Pressure in Orion A 
    Kirk, Helen; Friesen, Rachel K.; Pineda, Jaime E.; Rosolowsky, Erik; Offner, Stella S. R.; Matzner, Christopher D.; Myers, Philip C.; Di Francesco, James; Caselli, Paola; Alves, Felipe O.; Chacón-Tanarro, Ana; Chen, How-Huan; Chun-Yuan Chen, Michael; Keown, Jared; Punanova, Anna; Seo, Young Min; Shirley, Yancy; Ginsburg, Adam; Hall, Christine; Singh, Ayushi; Arce, Héctor G.; Goodman, Alyssa A.; Martin, Peter; Redaelli, Elena (2017)
    We use data on gas temperature and velocity dispersion from the Green Bank Ammonia Survey and core masses and sizes from the James Clerk Maxwell Telescope Gould Belt Survey to estimate the virial states of dense cores ...
  • The Green Bank Ammonia Survey: First Results of NH3 Mapping of the Gould Belt 
    Friesen, Rachel K.; Pineda, Jaime E.; co-PIs; Rosolowsky, Erik; Alves, Felipe; Chacón-Tanarro, Ana; How-Huan Chen, Hope; Chun-Yuan Chen, Michael; Di Francesco, James; Keown, Jared; Kirk, Helen; Punanova, Anna; Seo, Youngmin; Shirley, Yancy; Ginsburg, Adam; Hall, Christine; Offner, Stella S. R.; Singh, Ayushi; Arce, Héctor G.; Caselli, Paola; Goodman, Alyssa A.; Martin, Peter G.; Matzner, Christopher; Myers, Philip C.; Redaelli, Elena; GAS Collaboration (2017)
    We present an overview of the first data release (DR1) and first-look science from the Green Bank Ammonia Survey (GAS). GAS is a Large Program at the Green Bank Telescope to map all Gould Belt star-forming regions with ...

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