We report IRAM 30-m observations of vibrationally excited rotational transitions of HC 3 N toward a sample of six ultra–compact Hii regions. In addition, Effelsberg 100-m and Plateau de Bure Interferometer measurements were conducted toward the region G10.47+0.03. We detected the v 7 = 1 state of cyanoacetylene toward all six regions and the v 6 = 1 line toward five of them. Toward G10.47+0.03,...

We present a new millimeter survey of 23 pre-main−sequence stars in the Taurus-Auriga star forming region. The main goal of the project was to identify circumstellar disks around stars of late spectral types (M∗ . 0.7 M⊙). We used the IRAM Plateau de Bure Interferometer to obtain observations at 1.3mm, 2.7mm, and the CO J=1-0 and J=2-1 lines. We detected eight sources in continuum emission, wit...

3C318 is a z = 1.574 radio-loud quasar. The small physical size of its radio jets indicate that these jets were triggered relatively recently. In addition to the ultraviolet continuum emission being reddened by dust, detections with IRAS and SCUBA show it to have an exceptionally high far-infrared luminosity. We present CO (2-1) observations of 3C318 made with the IRAM Plateau de Bure Interfero...

Context. Due to its relatively small distance (725 pc), the Cepheus A East star-forming region is an ideal laboratory to study massive star formation processes. Aims. Based on its morphology, it has been suggested that the flattened molecular gas distribution around the YSO HW2 may be a 350-AU-radius massive protostellar disk. Goal of our work is to ascertain the nature of this structure. Metho...

Using the IRAM 30m telescope and the Plateau de Bure interferometer we have detected the C I(P2 →P1) and the CO 3−2, 4−3, 6−5, 7−6 transitions as well as the dust continuum at 3 and 1.2 mm towards the distant luminous infrared galaxy IRAS F10214+4724 at z = 2.286. The C I(P2 →P1) line is detected for the first time towards this source and IRAS F10214+4724 now belongs to a sample of only 3 extra...

We present high angular resolution observations toward two massive star forming regions IRAS 18264-1152 and IRAS 23151+5912 with the Plateau de Bure Interferometer (PdBI) in the SiO (J=2-1) and HCO (J=1-0) lines and at 1.3 mm and 3.4 mm continuum, and with the Very Large Array (VLA) in the NH3 (J,K)=(1,1), (2,2) lines. The NH3 (1,1) and (2,2) emission is detected toward IRAS 18264-1152 only. Fo...

Context. M 1–92 can be considered an archetype of bipolar pre-planetary nebulae. It shows a clear axial symmetry, along with the kinematics and momentum excess characteristic of this class of envelopes around post-AGB stars. Aims. By taking advantage of the new extended configuration of the IRAM Plateau de Bure interferometer, we wanted to study the morphology and velocity field of the molecula...

We present new high angular resolution observations of the 13 CO 1→0 rotational line towards the HBe star R Mon, obtained with the IRAM Bure In-terferometer, along with the previous results in the observed transitions 12 CO 1→0 and 2→1. We have used a flat disk model to fit the 12 CO 1→0 and 2→1, and 13 CO 1→0 emission, in a strip perpendicular to the outflow axis. The model assumes standard ab...

We used the Plateau de Bure Interferometer to observe λ3mm J=1-0 absorption lines of HCO + , HCN and CO toward the core of the nearby elliptical, megamaser-host galaxy NGC1052. The lines are relatively weak, with peak optical depths 0.03 for HCO + and HCN and 0.1 for CO. Nonetheless the inferred column density of molecular gas 2N(H2) ≃ 5×10 21 cm −2 is consistent with the degree of reddening in...

We present sensitive molecular line observations of the metal-poor blue compact dwarf I Zw 18 obtained with the IRAM Plateau de Bure interferometer. These data constrain the CO J = 1 → 0 luminosity within our 300 pc (FWHM) beam to be LCO < 1×10 5 K km s pc (ICO < 1 K km s ), an order of magnitude lower than previous limits. Although I Zw 18 is starbursting, it has a CO luminosity similar to or ...