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  • 1
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    Submillimeter heterodyne detection of interstellar carbon monoxide at 434 micrometers (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Laser heterodyne observations of submillimeter emissions from carbon monoxide in the Orion molecular cloud are reported. High frequency and spatial resolution observations were made at the NASA Infrared Telescope Facility on Mauna Kea by the use of an optically pumped laser local oscillator and quasi-optical Schottky diode mixer for heterodyne detection of the J = 6 - 5 rotational transition of CO at 434 microns. Spectral analysis of the 434-micron emission indicates that the emitting gas is optically thin and is at a temperature above 180 K. Results thus demonstrate the potential contributions of ground-based high-resolution submillimeter astronomy to the study of active regions in interstellar molecular clouds.
    Schlagwort(e): ASTRONOMY
    Materialart: Science; 211; Feb. 6
    Format: text
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  • 2
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    433 micron laser heterodyne observations of galactic CO from Mauna Kea (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: A submillimeter heterodyne radiometer, developed for astronomical applications, uses an optically pumped laser local oscillator and a quasi-optical Schottky diode mixer. The resultant telescope-mounted system, which has a noise temperature less than 4000 K (double sideband) and high frequency and spatial resolution, has been used to detect the J = 6 to 5 rotational transition of carbon monoxide at 434 micrometers in the Orion molecular clouds. The measurements, when compared with previous millimeter-wave data, indicate that the broad carbon monoxide emission feature is produced by an optically thin gas whose temperature exceeds 180 K.
    Schlagwort(e): ASTRONOMY
    Materialart: Infrared astronomy - Scientific/military thrusts and instrumentation; Apr 21, 1981 - Apr 22, 1981; Washington, DC
    Format: text
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  • 3
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    X-ray and optical observations of the November 19, 1978 gamma-ray burst source region (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: The Nov. 19, 1978 gamma-ray burst (GRB) has a very well determined error box, 10 square arcmin (Cline et al., 1981). An 8000-sec IPC exposure with the Einstein Observatory detected, at a 3.4-sigma level, one low intensity (less than 3 x 10 to the -13th erg/sq cm per sec) X-ray source inside the error box. The probability of a serendipitous detection was 0.01. Inside the X-ray source error box there are two weak radio sources, one of them highly polarized (Hjellming and Ewald, 1981), and two 20-magnitude objects, not coincident with the radio sources visible in the ESO/SRC J and R plates. With the exception of N49, this is the first possible detection of X-ray emission inside a GRB box. Its low intensity justifies, in fact, the lack of detection for other events.
    Schlagwort(e): ASTRONOMY
    Format: text
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  • 4
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    The Ophiuchus cluster - A bright X-ray cluster of galaxies at low galactic latitude (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The discovery of an extended X-ray source identified with a cluster of galaxies at low galactic latitude is reported. The source, designated the Ophiuchus cluster, was detected near 4U 1708-23 with the HEAO 1 Scanning Modulation Collimator, and identified with the cluster on the basis of extended X-ray size and positional coincidence on the ESO/SRC (J) plate of the region. An X-ray flux density in the region 2-10 keV of approximately 25 microJ was measured, along with an X-ray luminosity of 1.6 x 10 to the 45th ergs/sec and an X-ray core radius of approximately 4 arcmin (0.2 Mpc) for an assumed isothermal sphere surface brightness distribution. The X-ray spectrum in the range 2-10 keV obtained with the HEAO 1 A-2 instrument is well fit by a thermal bremsstrahlung model with kT = 8 keV and a 6.7-keV iron line of equivalent width 450 eV. The steep-spectrum radio source MSH 17-203 also appears to be associated with the cluster, which is the closest and brightest representative of the class of X-ray clusters with a dominant central galaxy.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 245
    Format: text
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  • 5
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    CCD photometry of 1218+304 1219+28 and 1727+50: Point sources, associated nebulosity and broadband spectra (1981)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Visual and far red surface photometry were obtained of two X-ray emitting BL Lacertae objects, 1218+304 (2A1219+305) and 1727+50 (Izw 187), as well as the highly variable object 1219+28 (ON 231, W Com). The intensity distribution for 1727+50 can be modeled using a central point source plus a de Vaucouleurs intensity law for an underlying galaxy. The broad band spectral energy distribution so derived is consistent with what is expected for an elliptical galaxy. The spectral index of the point source is alpha = 0.97. Additional VLBI and X-ray data are also reported for 1727+50. There is nebulosity associated with the recently discovered object 1218+304. No nebulosity is found associated with 1219+28. A comparison of the results with observations at X-ray and radio frequencies suggests that all the emission from 1727+50 and 1218+304 can be interpreted as due solely to direct synchrotron emission. If this is the case, the data further imply the existence of relativistic motion effects and continuous particle injection.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA-TM-82090
    Format: application/pdf
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  • 6
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    New interstellar molecular transitions in the 2 millimeter range (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: A Sgr B2 kinetic temperature of about 47 K is derived based on observations of K components of the 9K-8K transition of CH3CCH. Interstellar line emission is detected in the 2 mm wavelength region from SO, (S-34)O, SO2, CH3OH, CH3CCH, CH3CH2CN, HC3N, and nine unidentified transitions. The methylacetylene K component data combined with the derived data reduction technique, demonstrates the utility of the molecule as a temperature probe of molecular clouds when two or more rotational transitions are observed. Evidence for the existence of interstellar HNO is presented, and an attempt is made to detect sulfuric acid, formic anhydride, and the 0-18 isotopic for CO2 in interstellar clouds and in the Venusian atmosphere during inferior conjunction.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 251
    Format: text
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  • 7
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    A soft X-ray study of the Large Magellanic Cloud (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: It is estimated on statistical grounds that of the 97 sources detected in a survey of the Large Magellanic Cloud (LMC) by means of the Einstein Laboratory's imaging X-ray telescope, less than 25 are likely to be either foreground stars or background quasars. The largest class of identified sources discovered is that of supernova remnants (SNRs). It is confirmed by means of high resolution maps that six more sources are also SNRs, and an additional 20 to 25 unidentified sources are suspected, in light of the available temporal, spatial and spectral information, to be SNRs. Of the remaining approximately 40 sources, about half are expected to be either background active galactic nuclei or foreground stars. The unexpectedly large number of SNRs found in the survey suggests that present knowledge of the galactic remnant population may be incomplete.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 248
    Format: text
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  • 8
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    A high resolution IUE spectrum of the G0-G5Ia supergiant HR8752 (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: A high-resolution long-wavelength IUE spectrum of the G0-G5Ia supergiant HR 8752 and its B main sequence companion is discussed. The supergiant, which dominates for wavelengths greater than approximately 2700 A, appears to have a normal spectrum. The spectrum of the B star contains several deep asymmetric absorption lines. It is argued that these lines are interstellar and not circumstellar in origin.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomy and Astrophysics; 102; 3, Oc; Oct. 198
    Format: text
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  • 9
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    HEAO A-2 observations of non-Abell Zwicky clusters containing extended radio sources (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Burns and Owen's sample of 25 4C radio sources which coincide with Zwicky clusters of galaxies has been searched for X-ray emission using the HEAO 1 A-2 experiment. X-ray emission was detected from five sources at the 3sigma level, two of which exceeded 5sigma. Positions and 90% X-ray error boxes are given for each of the five sources detected. The clusters surveyed are non-Abell clusters which would generally not be expected to be detectable with the A-2 experiment. The search for X-ray emission was prompted by the knowledge of the existence of extended radio sources in the clusters. The relaxed structure of these sources implies the presence of a relatively dense intracluster medium which is expected to produce thermal bremsstrahlung X-ray emission.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 249
    Format: text
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  • 10
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    CCD photometry of the BL Lacertae objects 1218+304, 1219+28, and 1727+50 - Point sources, associated nebulosity, and broad-band spectra (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Visual and far-red surface photometry has been obtained for the X-ray emitting BL Lacertae objects 1218+304 and 1727+50, and the highly variable object 1219+28. The intensity distribution for 1727+50 can be modeled by means of a central point source and a de Vaucouleurs intensity law for an underlying galaxy. The spectral index of the point source of 1727+50 is found to be 0.97, while the indices for 1218+304 and 1219+28 are 0.91 and 1.7, respectively. Comparison of the results presented with X-ray and radio-frequency observations suggests that all emission from 1727+50 and 1218+304 is due to direct synchrotron emission. If this is the case, the relativistic motion effects and continuous particle injection are also implied by the data.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 249
    Format: text
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