Now showing items 1-16 of 16

    • A wide-angle outflow with the simultaneous presence of a high-velocity jet in the high-mass Cepheus A HW2 system 

      Torrelles, J. M.; Patel, N. A.; Curiel, S.; Estalella, R.; Gómez, J. F.; Rodríguez, L. F.; Cantó, J.; Anglada Escudé, Guillem; Vlemmings, W.; Garay Brignardello, Guido; Raga, A. C.; Ho, P. T. P. (2011)
      We present five epochs of VLBI water maser observations around the massive protostar Cepheus A HW2 with 0.4 mas (0.3 au) resolution. The main goal of these observations was to follow the evolution of the remarkable water ...
    • Cepheus A HW2: A powerful thermal radio jet 

      Rodríguez, L. F.; Garay Brignardello, Guido; Curiel, S.; Ramírez, Solange; Torrelles, J. M.; Gómez, Y.; Velásquez, A. (UNIV CHICAGO PRESS, 1994-07-20)
      At angular resolution of approximately 1 arc second(s) the Cepheus A East Radio source is known to consist of 16 compact components clustered within a 25 arc second(s) radius region, most of which are aligned in stringlike ...
    • Discovery of an energetic bipolar molecular outflow towards IRAS 16547-4247 

      Garay Brignardello, Guido; Mardones Pérez, Diego; Bronfman Aguiló, Leonardo; Brooks, K. J.; Rodríguez, L. F.; Güsten, R.; Nyman, L.-Å.; Franco Hernández, Ramiro; Morán, J. M. (EDP SCIENCES S A, 2007-02)
      Aims. We present molecular line observations of the molecular core associated with IRAS 16547-4247, which have allowed us to determine its physical and kinematical properties at angular resolutions of similar to 18". ...
    • The distribution of the warm and dense molecular gas around Cepheus A HW 2 

      Torrelles, J. M.; Gómez, J. F.; Garay Brignardello, Guido; Rodríguez, L. F.; Miranda, L. F.; Curiel, S.; Ho, P. T. P. (1999)
      We present VLA observations of the J; K 1; 1 , (2, 2), (3, 3) and (4, 4) inversion transitions of NH3 toward the HW 2 object in Cepheus A, with 1-arcsec angular resolution. Emission is detected in the main hyperfine ...
    • Evidence for evolution of the outflow collimation in very young stellar objects 

      Torrelles, J. M.; Patel, N. A.; Anglada Escudé, Guillem; Gómez, J. F.; Ho, P. T. P.; Lara, L.; Alberdi, A.; Cantó, J.; Curiel, S.; Garay Brignardello, Guido; Rodríguez, L. F. (2003-12-01)
      We present Very Long Baseline Array proper-motion measurements of water masers toward two young stellar objects (YSOs) of the W75 N star-forming region. We find that these two objects are remarkable for having a similar ...
    • An H2Co 6 cm maser pinpointing a possible circumstellar torus in IRAS 18566+0408 

      Araya, E.; Hofner, P.; Sewixo, M.; Goss, W. M.; Linz, H.; Kurtz, S.; Olmi, L.; Churchwell, E.; Rodríguez, L. F.; Garay Brignardello, Guido (UNIV CHICAGO PRESS, 2007-11-10)
      We report observations of 6 cm, 3.6 cm, 1.3 cm, and 7 mm radio continuum, conducted with the Very Large Array, toward IRAS 18566+0408, one of the few sources known to harbor H(2)CO6 cm maser emission. Our observations ...
    • he collimated jet source in IRAS 16547-4247: Time variation, possible precession, and upper limits to the proper motions along the jet axis 

      Rodríguez, L. F.; Moran, J. M.; Franco Hernández, Ramiro; Garay Brignardello, Guido; Brooks, Kate J.; Mardones Pérez, Diego (IOP PUBLISHING LTD, 2008-06)
      The triple radio source detected in association with the luminous infrared source IRAS 16547-4247 has previously been studied with high angular resolution and high sensitivity with the Very Large Array at 3.6 cm wavelength. ...
    • Large proper motions in the jet of the high-mass YSO cepheus a HW2 

      Curiel, S.; Ho, P. T. P.; Patel, N. A.; Torrelles, J. M.; Rodríguez, L. F.; Trinidad, M. A.; Cantó, J.; Hernández, L.; Gómez, J. F.; Garay Brignardello, Guido; Anglada, G. (2006-02-20)
      Using high angular resolution ( 0B25–0B05) Very Large Array (VLA) observations made at 3.6 cm, 1.3 cm, and 7 mm during the period 1991–2004, we report the detection of large proper motions in the components of the ...
    • Large proper motions in the remarkable triple radio source in Serpens 

      Rodríguez, L. F.; Curiel, S.; Moran, J. M.; Mirabel, I. F.; Roth, M.; Garay Brignardello, Guido (UNIV CHICAGO PRESS, 1989-11-15)
      The triple radio source in the Serpens star formation region consists of a central object and two lobes with spectral indices characteristic of nonthermal emission. Measurements made at the Arecibo Observatory and the VLA ...
    • Multifrequency VLA observations of radio continuum from IRAS 16293-2422 

      Estalella, R.; Anglada Escudé, Guillem; Rodríguez, L. F.; Garay Brignardello, Guido (1991-04-20)
      Using the VLA at 20, 6, 2, and 1.3 cm, we observed the cold infrared source IRAS 16293-2422. Our data allow a determination of the spectral indices of the components A and B. IRAS 16293-2422A, which is known from higher ...
    • The nature of the cluster of radio sources in GGD 14 

      Gómez, Y.; Rodríguez, L. F.; Garay Brignardello, Guido (The American Astronomical Society, 2002-06-01)
      We present sensitive radio continuum observations at 3.6 and 6 cm made quasi-simultaneously toward the star-forming region GGD 14. The observations reveal the presence of nine extremely compact ( 0>3) and faint radio ...
    • A photodissociated region associated with the compact Hıı region near GGD 12-15 

      Gómez, Y.; Lebrón, M.; Rodríguez, L. F.; Garay Brignardello, Guido; Lizano, S.; Escalante, V.; Cantó, J. (The American Astronomical Society, 1998-08-10)
      We present Very Large Array (VLA) continuum (2, 3.6, and 20 cm) and line (H I 21 cm, C92a, and H92a) observations toward the obscured cometary-like H II region located near the optical nebulosities GGD 12È15. We Ðnd that ...
    • Proper motions in Cepheus A 

      Rodríguez, L. F.; Torrelles, J. M.; Raga, A. C.; Canto, J.; Curiel, S.; Garay Brignardello, Guido (UNIV NACIONAL AUTONOMA MEXICO, 2005-10)
      We present an analysis of radio continuum observations made with the Very Large Array toward the region of massive star formation Cepheus A. The main purpose of this analysis is to search and study proper motions in the ...
    • Silicon monoxide and methanol emission from the NGC 2071 molecular outflow 

      Garay Brignardello, Guido; Mardones Pérez, Diego; Rodríguez, L. F. (2000-12-20)
      We report observations of emission in the J\3]2 and J\2]1 transitions of SiO and Jk\ 3k transitions of made with the Swedish-ESO Submillimeter Telescope (SEST), toward the ]2k CH3OH, high-velocity, collimated molecular ...
    • Spherical episodic ejection of material from a young star 

      Torrelles, J. M.; Patel, N. A.; Gómez, J. F.; Ho, P. T. P.; Rodríguez, L. F.; Anglada Escudé, Guillem; Garay Brignardello, Guido; Greenhill, L.; Curiel, S.; Cantó, J. (2001-05-17)
      The exact processes by which interstellar matter condenses to formyoung stars are of great interest, in part because they bear on the formation of planets like our own from the material that fails to become part of the ...
    • VLA and BIMA observations toward the exciting source of the massive HH 80-81 outflow 

      Gómez, Y.; Rodríguez, L. F.; Girart, J.M.; Garay Brignardello, Guido; Martí, J. (The American Astronomical Society, 2003-11-01)
      We present high angular resolution Very Large Array (VLA) and Berkeley-Illinois-Maryland Association (BIMA) observations of NH3, HCO+, HCN, and SO molecular emission and 1.4, 3.5, and 7 mm continuum emission toward the ...