Genesis and evolution of dust in galaxies in the early Universe II. Rapid dust evolution in quasars at z > 6

Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

9 pages, 4 figures, 4 tables

Scientific paper

10.1051/0004-6361/201015605

We assess the most plausible scenarios for generating large amounts of dust in high-z quasars (QSOs) on the basis of observationally derived physical properties of QSOs at z > 6. We use a chemical evolution model to compute the temporal progression of quantities, such as the amount of dust and gas, stellar masses, star formation rates (SFRs) and the metallicity for various combinations of the initial mass function (IMF), the mass of the galaxy, dust production efficiencies, and the degree of dust destruction in the ISM. We investigate the influence of the SFR on the evolution of these quantities, and determine the earliest epochs at which agreement with observations can be achieved. We apply the obtained results to individual QSOs at z > 6. We find that large quantities of dust can be generated rapidly as early as 30 Myr after the onset of the starburst when the SFR of the starburst is > 10^3 M_sun yr^(-1). The amount of dust and several other physical quantities of individual QSOs at z > 6 are satisfactorily reproduced by models at epochs 30, 70, 100, and 170 Myr for galaxies with initial gas masses of 1-3 x 10^11 M_sun. The best agreement with observations is obtained with top-heavy IMFs. A sizable dust contribution from supernovae (SNe) is however required, while at these epochs dust production by asymptotic giant branch (AGB) stars is negligible. Moderate dust destruction in the ISM can be accommodated.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Genesis and evolution of dust in galaxies in the early Universe II. Rapid dust evolution in quasars at z > 6 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Genesis and evolution of dust in galaxies in the early Universe II. Rapid dust evolution in quasars at z > 6, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Genesis and evolution of dust in galaxies in the early Universe II. Rapid dust evolution in quasars at z > 6 will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-8502

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.