Abstract
view Abstract Citations (28) References (63) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Needling the Early Universe Hawkins, Isabel ; Wright, Edward L. Abstract We explore the possibility that the entire cosmic microwave background (CMB) can be produced by a bright population of pregalactic stars at a redshift z of a few hundred. The thermalizing source of the background is a combination of silicate, amorphous carbon, and graphite spherical grains, together with graphite needle-shaped conducting grains which give rise to the long wavelength opacity. We have improved on previous studies by allowing each dust type to reach independently its own equilibrium temperature in the Population III star photon field. We find that the interaction of starlight with a small amount of these grains gives rise to a spectrum consistent with the available measurements of the CMB throughout the observable frequency range. The presence of needles inhibits distortions at low frequencies because these elongated grains never attain temperatures appreciably hotter than the CMB, but the other dust types are able to produce significant distortions near the peak of the CMB. In addition, we investigate the occurrence of deviations away from a perfect thermal spectrum in a primordial 2.7 K blackbody caused by an early stellar population and dust. A small quantity of spherical silicate and graphite grains produces potentially observable intensity deviations near the peak of the spectrum of a primordial CMB. We find that in our cold models the presence of dust causes intensity deviations at the 7% level. Distortions of this magnitude are consistent with the observational data, but large enough to be readily detectable by the Cosmic Background Explorer (COBE) satellite. Publication: The Astrophysical Journal Pub Date: January 1988 DOI: 10.1086/165879 Bibcode: 1988ApJ...324...46H Keywords: Astronomical Models; Background Radiation; Cosmic Rays; Red Shift; Stellar Evolution; Universe; Galactic Evolution; Interstellar Matter; Astrophysics; COSMIC BACKGROUND RADIATION; EARLY UNIVERSE; INTERSTELLAR: GRAINS full text sources ADS | data products SIMBAD (3)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
