Steep Faint-end Slopes of Galaxy Mass and Luminosity Functions at z ≥ 6 in Cosmological SPH Simulations and the Implications for Reionization

Details Steep Faint-end Slopes of Galaxy Mass and Luminosity Functions at z ≥ 6 in Cosmological SPH Simulations and the Implications for Reionization Steep Faint-end Slopes of Galaxy Mass and Luminosity Functions at z ≥ 6 in Cosmological SPH Simulations and the Implications for Reionization

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934003j&link_type=abstract

American Astronomical Society, AAS Meeting #219, #340.03

Mathematics

Logic

Scientific paper

We present the results of a numerical study comparing photometric and physical properties of simulated z = 6 - 9 galaxies to the observations taken by the WFC3 instrument aboard the Hubble Space Telescope. Using cosmological hydrodynamical simulations we find good agreement with observations in color-color space at all studied redshifts. We also find good agreement between observations and our Schechter luminosity function fit in the observable range, Muv ≤ -18. However beyond what currently can be observed, simulations predict a very large number of low-mass galaxies and evolving steep faint-end slopes from αL = -2.15 at z = 6 to αL = -2.64 at z = 9, with a dependence of |αL| ∝ (1+z)0.59. During the same epoch, the normalization φ* increases and the characteristic magnitude Muv becomes moderately brighter with decreasing redshift. We find similar trends for galaxy stellar mass function with evolving low mass end slope from αM =-2.26 at z=6 to αM =-2.87 at z=9, with a dependence of |αM | ∝ (1 + z)^0.65. We also find that the low mass halos (Mh < 1010 M*) in our simulations produce higher luminosity than predicted by semi-analytic models that are calibrated by the observed luminosity function at z=6. Together with our recent result on the high escape fraction of ionizing photons for low-mass galaxies, our results suggest that the low-mass galaxies are important contributor of ionizing photons for the reionization of the Universe at z ≥ 6.

Affiliated with

Also associated with

No associations

Rating

Steep Faint-end Slopes of Galaxy Mass and Luminosity Functions at z ≥ 6 in Cosmological SPH Simulations and the Implications for Reionization 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 Steep Faint-end Slopes of Galaxy Mass and Luminosity Functions at z ≥ 6 in Cosmological SPH Simulations and the Implications for Reionization, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Steep Faint-end Slopes of Galaxy Mass and Luminosity Functions at z ≥ 6 in Cosmological SPH Simulations and the Implications for Reionization will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1581055