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12CO(3-2) Emission in Spiral Galaxies: Warm Molecular Gas in Action?
Gaspar Galaz, Paulo Cortes, Leonardo Bronfman +1
Using the APEX sub-millimeter telescope we have investigated the 12CO(3-2) emission in five face-on nearby barred spiral galaxies, where three of them are high surface brightness g…
Submillimeter Line Emission from LMC N159W: a Dense, Clumpy PDR in a Low Metallicity Environment
J. L. Pineda, N. Mizuno, J. Stutzki +30
Star formation at earlier cosmological times takes place in an interstellar medium with low metallicity. The Large Magellanic Cloud (LMC) is ideally suited to study star formation…
Interferometric Mapping of Magnetic Fields: The massive star forming region G34.4+0.23 MM
P. C. Cortes, R. M. Crutcher, D. Shepherd +1
We report millimeter interferometric observations of polarized continuum and line emission from the massive star forming region G34.4. Polarized thermal dust emission at 3 mm wavel…
12CO 4-3 and [CI] 1-0 at the centers of NGC 4945 and Circinus
M. Hitschfeld, M. Aravena, C. Kramer +30
Studying molecular gas in the central regions of the star burst galaxies NGC4945 and Circinus enables us to characterize the physical conditions and compare them to previous local…
Clumpy photon-dominated regions in Carina. I. [CI] and mid-J CO lines in two 4'x4' fields
C. Kramer, M. Cubick, M. Roellig +31
The Carina region is an excellent astrophysical laboratory for studying the feedback mechanisms of newly born, very massive stars within their natal giant molecular clouds (GMCs) a…
Spiral structure in the outer Galactic disk. I. The Third Galactic Quadrant
Ruben A. Vazquez, Jorge May, Giovanni Carraro +3
We combine optical and radio observations to trace the spiral structure in the Third Quadrant of the Milky Way. The optical observations consist of a large sample of young open clu…
Molecular Outflows and a Mid-Infrared Census of the Massive Star-Formation Region Associated with IRAS 18507+0121
D. S. Shepherd, M. S. Povich, B. A. Whitney +7
We have observed the central region of the IR-dark cloud filament associated with IRAS 18507+0121 at millimeter wavelengths in CO(1-0), 13CO(1-0), and C18O(1-0) line emission and w…
New evidence on the origin of the microquasar GRO J1655-40
J. A. Combi, L. Bronfman, I. F. Mirabel
Aims. Motivated by the new determination of the distance to the microquasar GRO J1655-40 by Foellmi et al. (2006), we conduct a detailed study of the distribution of the atomic and…
CBI limits on 31 GHz excess emission in southern HII regions
C. Dickinson, R. D. Davies, L. Bronfman +5
We have mapped four regions of the southern Galactic plane at 31 GHz with the Cosmic Background Imager. From the maps, we have extracted the flux densities for six of the brightest…
A comparison of density structures of a star forming and a non-star-forming globule. DCld303.8-14.2 and Thumbprint Nebula
J. Kainulainen, K. Lehtinen, P. Vaisanen +2
We present a study of radial density structure of the star forming globule, DCld303.8-14.2 (DC303), and a non-star forming globule, Thumbprint Nebula (TPN), using near-infrared dat…
Molecular Gas, Kinematics, and OB Star Formation in the Spiral Arms of the Southern Milky Way
A. Luna, L. Bronfman, L. Carrasco +1
The rotation curve for the IV galactic quadrant, within the solar circle, is derived from the Columbia University - U. de Chile CO(J=1-0) survey of molecular gas. A new sampling, f…
Implications of the Cosmic Background Imager Polarization Data
J. L. Sievers, C. Achermann, J. R. Bond +17
We present new measurements of the power spectra of the E-mode of CMB polarization, the temperature T, the cross-correlation of E and T, and upper limits on the B-mode from 2.5 yea…
Polarization Observations with the Cosmic Background Imager
A. C. S. Readhead, S. T. Myers, T. J. Pearson +23
Polarization observations of the cosmic microwave background with the Cosmic Background Imager from September 2002 to May 2004 provide a significant detection of the E-mode polariz…
Vela X at 31 GHz
A. S. Hales, S. Casassus, H. Alvarez +6
We present observations of the Vela X region at 31 GHz using the Cosmic Background Imager (CBI). We find a strong compact radio source (5.9'x4.1', FWHM) about the Vela pulsar, whic…
Extended Mosaic Observations with the Cosmic Background Imager
A. C. S. Readhead, B. S. Mason, C. R. Contaldi +18
Two years of microwave background observations with the Cosmic Background Imager (CBI) have been combined to give a sensitive, high resolution angular power spectrum over the range…
Discovery of a Massive Protostar near IRAS 18507+0121
D. S. Shepherd, D. E. A. Nurnberger, L. Bronfman
We have observed the massive star forming region, IRAS 18507+0121, at millimeter wavelengths in 3 mm continuum emission and H13CO+(J=1-0) and SiO(v=0, J=2-1) line emission, and at…
First Intrinsic Anisotropy Observations with the Cosmic Background Imager
S. Padin, J. K. Cartwright, B. S. Mason +12
We present the first results of observations of the intrinsic anisotropy of the cosmic microwave background radiation with the Cosmic Background Imager from a site at 5080 m altitu…
The radial distribution of OB star formation in the Galaxy
L. Bronfman, S. Casassus, J. May +1
We present the azimuthally averaged radial distribution of 748 regions of OB star formation in the whole galactic disk, based on our previous CS(2-1) survey of UC H II regions. Emb…
The luminosity function of galactic ultra-compact HII regions and the IMF for massive stars
S. Casassus, L. Bronfman, J. May +1
The population of newly formed massive stars, while still embedded in their parent molecular clouds, is studied on the galactic disk scale. We analyse the luminosity function of IR…
Supernova Remnants Associated with Molecular Clouds in the Large Magellanic Cloud
Kenneth R. Banas, John P. Hughes, L. Bronfman +1
We used the Swedish-ESO Submillimeter Telescope (SEST) to search for CO emission associated with three supernova remnants (SNRs) in the Large Magellanic Cloud: N49, N132D, and N23.…