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Dust Emission from High-Redshift QSOs.

Carilli, Bertoldi, Menten

    The Astrophysical Journal
    |March 23, 2000
    PubMed
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    We detected millimeter-wave emission from two distant quasars (QSOs), including the highest redshift millimeter-emitting source known. This emission is likely thermal dust, suggesting significant dust mass and star formation in early galaxies.

    Area of Science:

    • Astronomy and Astrophysics
    • Cosmology
    • Galaxy Evolution

    Background:

    • High-redshift quasars (QSOs) are crucial for understanding the early universe.
    • Millimeter-wave observations probe dust emission, a key component of star formation and galaxy evolution.

    Purpose of the Study:

    • To detect and characterize millimeter-wave emission from high-redshift QSOs.
    • To investigate the nature of the millimeter emission and its implications for dust content and star formation.
    • To explore potential heating mechanisms for the dust.

    Main Methods:

    • Utilized the bolometer array at the IRAM 30 m telescope to observe 250 GHz (1.2 mm) emission.
    • Conducted deep 1.4 GHz radio continuum imaging with the Very Large Array.
    • Combined centimeter and millimeter observations for source characterization.

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    Main Results:

    • Detected 250 GHz emission from two Sloan Digital Sky Survey QSOs at z=3.7 and z=5.0.
    • The source at z=5.0 is the highest redshift millimeter-emitting source identified to date.
    • The emission is attributed to thermal dust, with estimated dust masses of ~10^8 solar masses and star formation rates >10^3 solar masses per year.

    Conclusions:

    • High-redshift QSOs can host substantial amounts of dust, indicative of vigorous early galaxy activity.
    • Both active galactic nucleus (AGN) UV emission and concurrent starbursts are plausible dust heating mechanisms.
    • These findings highlight the importance of multi-wavelength observations for studying early universe galaxies.