this is for holding javascript data
John Phillips edited Data Section.tex
over 9 years ago
Commit id: 04f91eb521549c9303783b35225edbdf07174717
deletions | additions
diff --git a/Data Section.tex b/Data Section.tex
index ce499fe..ebc2697 100644
--- a/Data Section.tex
+++ b/Data Section.tex
...
We draw our obseravational data from Data Release 7 (DR7) of the Sloan Digital Sky Survay (SDSS), making use of derived data products from the NYU Value-Added Galactic Catalog (VAGC). The magnitudes from the NYU VAGC that we use have been k-corrected to z = 0.1 using the code Kcorrect. Additionally, we restrict ourselves to regions of SDSS where the spectroscopic completeness parameter FGOTMAIN exceeds 0.7. We also reject all galaxies with velocity errors greater than $\sqrt{2} \times 25$ km/s.
In selecting our sample, we initially adhere closely to the procudure of I14. We select a sample of hosts in the magnitude range $-23 \lt r \lt -20$ and within a redshift range of $0.002 \lt z \lt 0.05$. A host is considered isolated if there are no brighter objects within 500 kpc on the sky in projection and within 1500 km/s in velocity space. Only isolated hosts are retained, reducing the number of sources to 22780 isolated hosts. From there we identified satellites around each host. Galaxies meet the criteria for being counted as satellites if their magnitudes lie in the range $r_{host} + 1 < r_{sat} < -16$, their projected distance from the host lies between 20 kpc and
350 150 kpc, and their velocity offset from the host lies between $\rm 25 < |v_{sat} - v{host}| < 300 \times exp(-(d_{proj}/300
kpc)^{0.8})$ but fainter than one magnitude fainter than its hostlying between kpc)^{0.8})$. This velocity bound is taken from I14, and is designed to reduce the interloper fraction in the satellite sample.