Showing posts with label photometry. Show all posts
Showing posts with label photometry. Show all posts

Wednesday, March 17, 2010

Changing QSO Catalog Inputs

I'm trying to figure out how to modify the inputs (currently SDSS DR5 quasars with good photometry) into Joe's Monte Carlo. Here is what I have figured out so far (all the below files are on riemann):

hiz_kde_numerator.pro ;main program to generate the QSO Catalog
(calls) →
qso_fakephoto.pro ;generates simulated redshift and i-magnitude based on luminosity function and DR5 inputs
(calls) →
qso_photosamp.pro ;This generates the training set photometry
(calls) →
sdss_read_data.pro ;This reads in SDSS data it currently has the following 'DR5' call
qsos = sdss_read_data('DR5', Z_MIN = Z_MIN, Z_MAX = Z_MAX)

Here is a color-color redshift temperature plot of these DR5 QSOs:


I'm going to try to add in the BOSS QSOs with co-added photometry, especially in the redshift range z > 2.0 where we seem to be missing QSOs:


I found that there are 1,973 BOSS quasars that have a redshift above 2.0 for which we also have coadded photometry. Here they are plotted:


While it is a little more filled in in the u-g = 0.8 space, comparing it to all the BOSS quasars (regardless of how good their photometry is) below:

Friday, October 2, 2009

BOSS Data Kickoff Meeting

Today there was a meeting at LBNL to introduce people to the BOSS Data pipeline.
Some useful links (appologies, those not part of the SDSS collaboration wont be able to view these without membership):
Photometry information: http://www.sdss.org/dr7/algorithms/photometry.html
Photometry will be essentially the same as SDSS-II

Flags information: http://www.sdss.org/dr7/products/catalogs/flags.html
It was recommended that I use the new reduction on riemann instead of those on the CAS. Need to get David/Eric to help me to get a catalog of objects to run the reconstruction code on that have good photo-zs.
QSO Truth Table: https://trac.sdss3.org/wiki/BOSS/data_access
https://trac.sdss3.org/attachment/wiki/BOSS/target/Commissioning/
Need to see how well likelihood did in comparison to other methods for QSO target selection
View Spectroscopic Data on Riemann
Put these commands in your .bashrc file:
export IDLUTILS_DIR=$HOME/idlutils
export IDLSPEC2D_DIR=$HOME/idlspec2d
export IDL_PATH=+{$IDLUTILS_DIR/pro}:+{$IDLSPEC2D_DIR/pro}:{$IDL_PATH}
export SPECTRO_DATA=/clusterfs/riemann/raid006/bossredux/v5_4_1

In IDL, use "plotspec" to display spectra. For example:
IDL> plotspec, 3552, mjd=55098, 572