Showing papers by "Thomas G. Phillips published in 1984"
TL;DR: In this paper, the first aperture synthesis maps of lambda2.6 mm CO emission from an external galaxy, IC 342, were made with the Owens Valley Millimeter-Wave Interferometr.
Abstract: We present the first aperture synthesis maps of lambda2.6 mm CO (J = 1-0) emission from an external galaxy, IC 342. The 7'' resolution maps of the nuclear region were made with the Owens Valley Millimeter-Wave Interferometr. They reveal that the CO source is distributed in a bar, 300 pc x > or approx. =1500 pc, with a veloity gradient across the width of the bar. The observations suggest that the molecular gas in the nucleus is moving in response to an oval gravitational potential. The implications of an oval potential on enhanced star formation and other activities are discussed.
58 citations
TL;DR: Spectral observations of the core of Orion A at wavelengths around 1.3 mm show a high density of strong, broad emission lines, which accounts for approximately 40 percent of the broad-band millimeter-wave flux from the region.
Abstract: Spectral observations of the core of Orion A at wavelengths around 1.3 mm show a high density of strong, broad emission lines. The combined flux in lines with peak antenna temperatures stronger than 0.2 K accounts for approximately 40 percent of the broad-band millimeter-wave flux from the region. Thus the broad-band flux from Orion A is in large part due to sources other than dust emission.
20 citations
[...]
TL;DR: In this paper, transition line data for C-13H3OH in OMC-1 were gathered with a superconducting tunnel junction receiver and a 512 channel spectrometer on a 10.4 m telescope at the Owens Valley Radio Observatory.
Abstract: Transition line data for C-13H3OH in OMC-1 were gathered with a superconducting tunnel junction receiver and a 512 channel spectrometer on a 10.4 m telescope at the Owens Valley Radio Observatory. The methanol was scanned at 236 GHz and an observational efficiency of 85 percent. The survey was carried out to complement the data base on the line frequencies of internal rotors such as methanol and thereby the resolution of the C-12/C-13 ratio toward the galactic center. The data indicated that previous emission lines attributed to CO(+) and CH3CHO are actually methanol emissions, and the associated C-12/C-13 ratio is about 30.
19 citations
TL;DR: In this paper, the authors presented the first aperture synthesis maps of /sup 12/CO (J = 1-0) emission from a galactic star-forming region, associated with IRS5.
Abstract: We present the first aperture synthesis maps of /sup 12/CO (J = 1-0) emission from a galactic star-forming region. We have mapped the line and continuum emission from a 1' field centered on W3 IRS5 with the Owens Valley millimeter-wave interferometer. Although we did not detect any radio continuum emission from IRS5 to a 5 sigma limit of 130 mJy, we have found, associated with IRS5, compact (approx. 8'') sourcces of high velocity red- and blueshifted CO emission with T/sub B/roughly-equal20 K. The estimated mass in each wing is 1 M/sub sun/, with density roughly-equal10/sup 5/ cm/sup -3/. The outflow is similar to other known sources with high-velocity emission and has a short dynamic lifetime such as found in Orion. We suggest that the two infrared sources which comprise IRS5 are in differing stages of evolution.
19 citations
TL;DR: In this paper, the Owens Valley millimeter interferometer was used to detect CO emission from a source at 5 km s/sup -1/ V/sub LSR/ in the vicinity of the NH/sub 3/ ''hot core'' source.
Abstract: We have observed /sup 12/CO and /sup 13/CO emission from Orion A, using the Owens Valley Millimeter Interferometer. We have detected CO emission from a source at 5 km s/sup -1/ V/sub LSR/ in the vicinity of the NH/sub 3/ ''hot core'' source. We estimate a mass of 5 M/sub sun/ for this source, for which we find a size of approx.12''. The E-W size of the plateau source is measured to be approx.17'', implying a high density (approx.5 x 10/sup 6/ cm/sup -3/) for the gas in the outflow.
10 citations
Book Chapter•
01 Jan 1984
TL;DR: The Caltech millimeter-wave interferometer has recently begun observations at a wavelength of 2.6 mm as mentioned in this paper, and some of the first results from it have been reported.
Abstract: The Caltech Millimeter-Wave Interferometer has recently begun observations at a wavelength of 2.6 mm. We describe the instrument and some of the first results from it.
6 citations
Book Chapter•
01 Jan 1984
TL;DR: Spectroscopic studies of interstellar clouds can now be made in the submillimeter and far-infrared bands, essentially free from the absorbing effect of the Earth's atmosphere, by means of the NASA Kuiper Airborne Observatory.
Abstract: Spectroscopic studies of interstellar clouds can now be made in the
submillimeter and far-infrared bands, essentially free from the absorbing
effects of the Earth's atmosphere, by means of the NASA Kuiper Airborne
Observatory Also large telescopes for the submillimeter are now under
construction on mountain tops Both high and intermediate resolution
spectroscopic techniques have been successfully employed in the detection
of many new molecular and atomic lines including rotational transitions
of hydrides such as OH , H_20, NH_3 , and HCl; high J rotational transitions
of CO; and the ground state fine structure transitions of atomic carbon,
oxygen, singly ionized carbon and doubly ionized oxygen and nitrogen In
addition, heavy molecules have prolific spectra in the near millimeter
band, and this is expected to extend to the submillimeter These various
submillimeter transitions have been used to study the physics and chemistry
of clouds throughout the galaxy, in the galactic center region, and in
neighboring galaxies
3 citations
Book Chapter•
01 Jan 1984
TL;DR: In this article, 3.7"-resolution maps of CO emission from the central 2' of M51 have been made with the Owens Valley millimeter-wave interferometer, where relative warm gas from giant molecular clouds is seen largely confined to arms coincident with the dust lanes, forming coherent structure on the scale of 3 Kpc.
Abstract: 7"-resolution maps of CO emission from the central 2' of M51 have been made with the Owens Valley millimeter-wave interferometer. Relative warm gas from giant molecular clouds is seen largely confined to arms coincident with the dust lanes, forming coherent structure on the scale of ~3 Kpc. There is a minimum of CO emission within 400 pc of the center. Integrated CO intensity maps are presented. Non-circular motion of the CO gas is evident from the velocity field.
1 citations
01 Dec 1984
TL;DR: The results of far-infrared spectroscopy with the Kuiper Airborne Observatory are discussed in this paper, where the authors show that both high and intermediate resolution have been successfully employed in the detection of many new molecular and atomic lines including rotational transition of hydrides such as OH, H2O, NH3 and HCl; high J rotational transitions of CO; and ground state fine structure transitions of atomic carbon, oxygen, singly ionized carbon and doubly ionised oxygen and nitrogen.
Abstract: Research results of far-infrared spectroscopy with the Kuiper Airborne Observatory are discussed. Both high and intermediate resolution have been successfully employed in the detection of many new molecular and atomic lines including rotational transition of hydrides such as OH, H2O, NH3 and HCl; high J rotational transitions of CO; and the ground state fine structure transitions of atomic carbon, oxygen, singly ionized carbon and doubly ionized oxygen and nitrogen. These transitions have been used to study the physics and chemistry of clouds throughout the galaxy, in the galactic center region and in neighboring galaxies. This discussion is limited to spectroscopic studies of interstellar gas.