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Luminous Stars in the Cores of H II Regions
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1973PASP...85..586J&db_key=AST
| 100-MICRON Survey of the Galactic Plane
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1971ApJ...170L..89H&db_key=AST
| Surveys of the galactic plane at 1.414, 2.695 and 5.000 GHz
Abstract image available at:http://adsabs.harvard.edu/abs/1970A&AS....1..319A
| The space distribution of stars in a region with the center l = 343, b = 0 (alpha = 18h 10m, delta = -15 degres).
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| Radio Observations of Ionized Hydrogen Nebulæ and Other Discrete Sources at a Wave-length of 9.4 cm.
IN recent attempts1-3 to account for the general radioemission from the Galaxy as the integrated radiation of discretegalactic radio sources, it was found necessary to introduce the effectof ionized interstellar hydrogen, H II regions, to fit the observedradio isophotes at various frequencies. Scheuer and Ryle4detected, at wave-lengths of 1.4 and 3.7 m., a bright band of emissionconfined within 2° of the galactic equator superimposed on thegeneral radiation. They identified the bright band with thermal emissionfrom a distribution of H II regions. H II regions are stronglyconcentrated in the galactic plane. The large source, Cygnus X, has beententatively described as thermal emission5, perhaps fromseveral bright H II regions surrounding γ Cygni5, orfrom the integrated radiation of all the H II regions in the spiral armin the direction of Cygnus8. However, Baldwin6attempted unsuccessfully to detect, at a wave-length of 1.4 m., a verybright individual H II region, the Orion nebula. Observations ofdiscrete sources have been almost entirely confined to metrewave-lengths, where spectra of more than twenty sources have beenobtained7. Piddington and Minnett5,8 observed fivediscrete sources at a wavelength of 25 cm. and the emission at 25 and 10cm. from a region near the galactic centre. This was an appreciableextension of the short-wave limit of source spectra.
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