view Abstract Citations (92) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Far-infrared observations of the Crab nebula. Marsden, P. L. ; Gillett, F. C. ; Jennings, R. E. ; Emerson, J. P. ; de Jong, T. ; Olnon, F. M. Abstract Infrared photometry for the total flux from the Crab nebula using the Infrared Astronomical Satellite (IRAS) survey detectors is presented. The observations show an infrared excess beyond 12 microns over the extrapolated radio and near-infrared fluxes. The break in the radio spectrum occurs at approximately 1 x 10 to the 13th Hz, consistent with an average magnetic field strength of roughly 300 microgauss. The luminosity excess is approximately 1000 solar luminosities and is interpreted as due to thermal emission from 0.005-0.03 solar masses of dust in the nebula. Publication: The Astrophysical Journal Pub Date: March 1984 DOI: 10.1086/184215 Bibcode: 1984ApJ...278L..29M Keywords: Astronomical Photometry; Crab Nebula; Far Infrared Radiation; Infrared Astronomy; Cosmic Dust; Field Strength; Infrared Astronomy Satellite; Infrared Photometry; Magnetic Fields; Radio Sources (Astronomy); Astrophysics full text sources ADS | data products SIMBAD (2)
view Abstract Citations (177) References (10) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS IRAS observations of the diffuse infrared background. Hauser, M. G. ; Gillett, F. C. ; Low, F. J. ; Gautier, T. N. ; Beichman, C. A. ; Neugebauer, G. ; Aumann, H. H. ; Baud, B. ; Boggess, N. ; Emerson, J. P. ; Houck, J. R. ; Soifer, B. T. ; Walker, R. G. Abstract IRAS data reveal bright emission from interplanetary dust which dominates the celestial background at 12, 25, and 60 microns except near the galactic plane. At 100 microns, interplanetary dust emission is prominent only near the ecliptic plane; diffuse galactic emission is found over the rest of the sky. At the galactic poles, the observed brightness implies that A(v) is likely to be of order 0.1 mag. The angular variation of the zodiacal emission in the ecliptic plane and in the plane at elongation 90 deg, and an annual modulation of the ecliptic pole brightness, are generally consistent with previously determined interplanetary dust distributions. Publication: The Astrophysical Journal Pub Date: March 1984 DOI: 10.1086/184212 Bibcode: 1984ApJ...278L..15H Keywords: Background Radiation; Diffuse Radiation; Infrared Astronomy; Interplanetary Dust; Brightness; Emission Spectra; Infrared Astronomy Satellite; Astronomy full text sources ADS |
view Abstract Citations (589) References (7) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Infrared cirrus: new components of the extended infrared emission. Low, F. J. ; Beintema, D. A. ; Gautier, T. N. ; Gillett, F. C. ; Beichman, C. A. ; Neugebauer, G. ; Young, E. ; Aumann, H. H. ; Boggess, N. ; Emerson, J. P. ; Habing, H. J. ; Hauser, M. G. ; Houck, J. R. ; Rowan-Robinson, M. ; Soifer, B. T. ; Walker, R. G. ; Wesselius, P. R. Abstract Extended sources of far-infrared emission superposed on the zodiacal and galactic backgrounds are found at high galactic latitudes and near the ecliptic plane. Clouds of interstellar dust at color temperatures as high as 35K account for much of this complex structure, but the relationship to H I column density is not simple. Other features of the extended emission show the existence of warm structures within the solar system. Three bands of dust clouds at temperatures of 150 - 200K appear within 10° on both sides of the ecliptic plane. Their ecliptic latitudes and derived distances suggest that they are associated with the main asteroid belt. A third component of the 100 μm cirrus, poorly correlated with H I, may represent cold material in the outer solar system or a new component of the interstellar medium. Publication: The Astrophysical Journal Pub Date: March 1984 DOI: 10.1086/184213 Bibcode: 1984ApJ...278L..19L Keywords: Astronomical Spectroscopy; Cosmic Dust; Infrared Astronomy; Interplanetary Dust; Interstellar Matter; Asteroids; Emission Spectra; Far Infrared Radiation; Nebulae; Astrophysics full text sources ADS |
Optical and near-infrared observations of IRAS 12496 - 7650, an active young star and the most luminous IRAS source in the Chamaeleon II dark cloud, are reported. The object has become brighter at optical wavelengths since 1976, and has exhibited variations of more than a magnitude at K between January 1987 and May 1990. IRAS 12496 - 7650 is redder when fainter, and the amplitude of the brightness fluctuations decreases toward longer infrared wavelengths. Differing amounts of circumstellar extinction or intrinsic color variations of the source can produce most of the observed variability. Optical spectra confirm that IRAS 12496 - 7650 is an extremely active (probably Herbig Ae type) star with blueshifted forbidden lines of O I and S II and a prominent P-Cygni profile at H-alpha. The S II emission extends 3-4 arcsec on either side of the star and shows a significant velocity gradient, suggestive of a jetlike structure. The detection of outflowing material from IRAS 12496 - 7650 reinforces earlier evidence that this object is the exciting source for the HH 52 - 54 group Herbig-Haro objects. The broad spectral energy distribution suggests that IRAS 12496 - 7650 has a circumstellar disk.
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