Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-02-25
Mon.Not.Roy.Astron.Soc.405:1025-1039,2010
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
16 pages, 10 figures, submitted to MNRAS
Scientific paper
We present a simultaneous detection of gravitational magnification and dust reddening effects due to galactic halos and large-scale structure. The measurement is based on correlating the brightness of ~85,000 quasars at z>1 with the position of 20 million galaxies at z~0.3 derived from the Sloan Digital Sky Survey and is used to constrain the galaxy-mass and galaxy-dust correlation functions up to cosmological scales. The presence of dust is detected from 20 kpc to several Mpc, and we find its projected density to follow: Sigma_dust ~ theta^-0.8, a distribution similar to mass. The amount of dust in galactic halos is found to be comparable to that in disks. On large scales its wavelength dependence is described by R_V=3.9+/-2.6, consistent with interstellar dust. We estimate the resulting opacity of the Universe as a function of redshift and find A_V~0.03 mag up to z=0.5. This, in turn, implies a cosmic dust density of Omega_dust ~ 5x10^-6, roughly half of which comes from dust in halos of ~L* galaxies. We present magnification measurements, corrected for dust extinction, from which the galaxy-mass correlation function is inferred. The mean mass profile around galaxies is found to be Sigma ~ 30 (theta/arcmin)^-0.8 h M_sun/pc^2 up to a radius of 10 Mpc, in agreement with gravitational shear estimates.
Fukugita Masataka
Menard Brice
Richards Gordon
Scranton Ryan
No associations
LandOfFree
Measuring the galaxy-mass and galaxy-dust correlations through magnification and reddening 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 Measuring the galaxy-mass and galaxy-dust correlations through magnification and reddening, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measuring the galaxy-mass and galaxy-dust correlations through magnification and reddening will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-253478