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  • ASTROPHYSICS  (3)
  • 04.80  (2)
  • Astrophysics  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    The fast frequency stabilisation of an argon laser to an optical resonator using an extra-cavity electro-optic modulator (1985)
    Springer
    Applied physics 37 (1985), S. 11-16 
    Details
    ISSN: 1432-0649
    Keywords: 04.80 ; 07.60 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A frequency stabilisation system for an argon laser is described, incorporating a fast piezoelectrically driven laser mirror and an extracavity electro-optic phase shifter. We show that results obtained with this method are potentially as good as those reported from systems which use fast intra-cavity modulators. This technique avoids the loss associated with an intra-cavity device, thus allowing higher power output, and so making it an attractive alternative to present stabilisation systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00691687
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Coherent addition of laser oscillators for use in gravitational wave antennas (1989)
    Springer
    Applied physics 49 (1989), S. 491-495 
    Details
    ISSN: 1432-0649
    Keywords: 04.80 ; 07.60 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The amount of laser power required for the large scale interferometric gravitational wave antennas currently being proposed may well require the coherent summation of the light from several lasers. In this paper the feasibility of two potential summation schemes are experimentally compared and contrasted by adding the outputs of two argon lasers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325354
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    Paper (German National Licenses)
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  • 3
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    Molecular hydrogen polarization images of OMC-1 (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An image of the polarization of the shocked H2 v = 1-0 S(1) line emission in the core of OMC-1 has been obtained. Along the molecular outflow of the source, the line is dichroically polarized by a medium of aligned grains located between the earth and the shock fronts. The polarization pattern traces the magnetic field direction, which is parallel to the outflow axis and to the large-scale field direction determined from far-IR continuum measurements. Close to the IR source IRc2, the likely source of the outflow, the aligned vectors twist, indicating that the magnetic field direction changes. Modeling the line ratios of scattered H2 lines in the reflection nebula, it is concluded that the size distribution of grains there is typical of the small grains in the diffuse interstellar medium. By contrast, the scattered continuum radiation from the core region suggests that the grains there are larger than this.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 375; 611-617
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Spectropolarimetry of the molecular hydrogen line emission from OMC-1 (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Observations of the H2 v = 1-0 S(1) line at 35 km/s velocity resolution were obtained at several locations within OMC-1, including the molecular hydrogen reflection nebula. All line profiles are smooth and show no evidence for being composed of discrete components. The data are discussed with respect to a model for the H2 line formation in which the emission originates in discrete clumps moving at different velocities. It is suggested that the extended blue wing may come from fast-moving clumps embedded in a wind.
    Keywords: ASTROPHYSICS
    Type: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711); 235; 161-174
    Format: text
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  • 5
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    The noise of BL Lacertae (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Results are presented from an intensive optical and IR monitoring program of the flux and polarization characteristics of BL Lac. It is found that the polarization variations increase in amplitude with increasing time interval, and that the path traced out by the polarization vector in the Q-U plane is a random walk. In view of earlier measurements of BL Lac, the polarization fluctuations can be represented at low frequencies by the flat power spectrum of white noise, up to a frequency of 0.05 cycles/day. Above this frequency, the spectrum steepens to that of a random walk. A model for BL Lac suggested by the polarimetric noise can be constructed from independent sources of light with randomly oriented, strong polarization. Small random differences in spectral index from source to source could also explain the variable wavelength dependence of polarization.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 260
    Format: text
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  • 6
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    Supplement: The Rate of Binary Black Hole Mergers Inferred from Advanced LIGO Observations Surrounding GW150914 (2016)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This article provides supplemental information for a Letter reporting the rate of (BBH) coalescences inferred from 16 days of coincident Advanced LIGO observations surrounding the transient (GW) signal GW150914. In that work wereported various rate estimates whose 90% confidence intervals fell in the range 2600 Gpc(exp -3) yr(exp -1). Here we givedetails on our method and computations, including information about our search pipelines, a derivation of ourlikelihood function for the analysis, a description of the astrophysical search trigger distribution expected frommerging BBHs, details on our computational methods, a description of the effects and our model for calibrationuncertainty, and an analytic method for estimating our detector sensitivity, which is calibrated to our measurements.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN44086 , The Astrophysical Journal: Supplement Series (ISSN 0067-0049) (e-ISSN 1538-4365); 227; 2; 14
    Format: text
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