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Synchrotron emission is commonly found in relativistic jets from active galactic nuclei (AGNs) and microquasars, but so far its presence in jets from young stellar objects (YSOs) has not been proved. Here, we present evidence of polarized synchrotron emission arising from the jet of a YSO. The apparent magnetic field, with strength of ~0.2 milligauss, is(More)
We present [SII] images of the HH 30 and HL/XZ Tau region obtained at two epochs, as well as long-slit optical spectroscopy of the HH 30 jet. We measured proper motions of ∼100–300 km s −1 for the HH 30 jet and counterjet, and of ∼120 km s −1 for the HL Tau jet. Inclination angles with respect to the plane of the sky are 0 • –40 • for the HH 30 jet and 60 •(More)
  • Guillem Anglada, Eva Villuendas, Robert Estalella, Maria T Beltrr An, Luis F Rodr Guez, Jos +2 others
  • 2007
We present 6 cm VLA observations of nine regions with molecular or HH outtows, that appear to be driven by young stellar objects of low bolometric luminosity. Radio continuum emission at 3.6 cm had been previously detected toward the center of symmetry of 13 outtows in these regions. With the new 6 cm observations we have been able to estimate the spectral(More)
We present a model aimed to reproduce the observed spectral energy distribution (SED) as well as the ammonia line emission of the G31.41+0.31 hot core. The hot core is modeled as an infalling envelope onto a massive star that is undergoing an intense accretion phase. We assume an envelope with a density and velocity structure resulting from the dynamical(More)
We present Very Large Array (VLA) observations of H 2 O and OH masers, as well as radio continuum emission at 1.3 and 18 cm toward three sources previously cataloged as planetary nebulae (PNe) and in which single-dish detections of H 2 O masers have been reported: IRAS 17443−2949, IRAS 17580−3111, and IRAS 18061−2505. Our goal was to unambiguously confirm(More)
  • Esteban Araya, Peter Hofner, Ed Churchwell, Stan Kurtz, Maria T Beltrán, Robert Estalella +4 others
  • 2005
We report observations of the H110α radio recombination line and H 2 CO 1 1,0-1 1,1 toward 21 ultracompact HII regions with the Arecibo 305 m Telescope. We detect the H110α line in 20 sources, and for each of these we detect a H 2 CO absorption feature at nearly the same velocity demonstrating the association between molecular and ionized gas. We determine(More)
The processes leading to the birth of low-mass stars such as our Sun have been well studied, but the formation of high-mass (over eight times the Sun's mass, M(o)) stars remains poorly understood. Recent studies suggest that high-mass stars may form through accretion of material from a circumstellar disk, in essentially the same way as low-mass stars form,(More)
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