Now showing items 1-9 of 9

    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • The circumstellar structure and excitation effects around the massive protostar Cepheus A HW 2 

      Torrelles, J. M.; Patel, N. A.; Curiel, S.; Ho, P. T. P.; Garay Brignardello, Guido; Rodríguez, Luis F. (2007)
      We report SMA 335 GHz continuum observations with angular resolution of similar to 0.3'', together with VLA ammonia observations with similar to 1'' resolution toward Cep A HW 2. We find that the flattened disk structure ...