Hicetus

Charette, François; Garstang, Roy H.; Green, Daniel W. E.; Florence, Ronald; Yeomans, Donald K.; Frommert, Hartmut; Kokott, Wolfgang; Sarma, Ke Ve; Martínez, Durruty Jesús de Alba; Jarrell, Richard A.; Dobbins, Thomas A.; Plicht, Christ of A.; Sakurai, K.; Brentjes, Sonja; Ríus, Mònica; Reshaw, Steven L.; Thara, Saori; Moore, Patrick; Butzer, Paul L.; Hatch, Robert Alan; Schons, Paul A.; Hirshfeld, Alan W.; Brashear, Ronald; Barthalot, Raymonde; Bohm, Karl‐Heinz; Nitschelm, Christian; Beavers, Anthony F.; Scott, Douglas; Beech, Martin; Ruskin, Steven; Poitevin, Patrick; Evans, David S.; Crowe, Michael J.; Lafortune, Keith R.; Herrmann, Dieter B.; Oka, Takeshi; Kolak, Daniel; Habashi, Fathi; Williams, Thomas R.; Sullivan, Woodruff T.; Durham, Ian T.; Bowden, Alan J.; Dick, Steven J.; Marché, Jordan D.; Shectman, Stephen; Sheehan, William; Bogdan, Thomas J.; Kwan, Alistair; Sturdy, David J.; Holland, Julian; Bolt, Marvin; Horch, Elliott; Zejda, Miloslav; Wlasuk, Peter; Szabados, László; Wegner, Gary A.; McMahon, John M.; Kozai, Yoshihide; Drake, Ellen Tan; Bònoli, Fabrizio; Hansen, Truls Lynne; Jackson, Francine; Kumar, Suhasini; Meo, Michael; Trachet, Tim; Clayton, Donald D.; Kragh, Helge; Brück, Mary T.; Milone, Eugene F.; Trimble, Virginia; Hamel, Jürgen; Hentschel, Klaus; King, David A.; Lindner, Rudi Paul; Cunningham, Clifford J.; Kubbinga, Henk; Pasachoff, Naomi; Pasachoff, Jay M.; Bracher, Katherine

doi:10.1007/978-0-387-30400-7_621

Cited by 1 publication

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“…The uncertainties are 1σ about the mean of the four observations. Kalberla et al (1982) concluded that when stray radiation is taken into account the principal H I calibration observations (Penzias et al 1970;Wrixon and Heiles 1972;Williams 1973) are in agreement to within about 3%. Thus our data reduction procedure appear to produce GBT H I spectra with an accurate brightness temperature scale, one that is consistent with other calibrations.…”

Section: Gbt Datamentioning

confidence: 91%

MEASURING TURBULENCE IN THE INTERSTELLAR MEDIUM BY COMPARINGN(H I; Lyα) ANDN(H I; 21 cm)

Wakker¹,

Lockman²,

Brown³

2011

ApJ

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We present a study of the small-scale structure of the interstellar medium in the Milky Way. We used HST STIS data to measure N(H I) in a pencilbeam toward 59 AGNs and compared the results with the values seen at 9 ′ -36 ′ resolution in the same directions using radio telescopes (GBT, Green Bank 140-ft and LAB survey). The distribution of ratios N(Lyα)/N(H I) has an average of 1 and a dispersion of about 10%. Our analysis also revealed that spectra from the Leiden-Argentina-Bonn (LAB) all-sky H I survey need to be corrected, taking out a broad gaussian component (peak brightness temperature 0.048 K, FWHM 167 km s −1 , and central velocity −22 km s −1 ). The column density ratios have a distribution showing similarities to simple descriptions of hierarchical structure in the neutral ISM, as well as to a more sophisticated 3D MHD simulation. From the comparison with such models, we find that the sonic Mach number of the local ISM should lie between 0.6 and 0.9. However, none of the models yet matches the observed distribution in all details, but with many more sightlines (as will be provided by COS) our approach can be used to constrain the properties of interstellar turbulence.

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Section: Gbt Datamentioning

confidence: 91%