# AUTHOR: Walcher, Mast, Catalan-Torrecilla
# SOURCE: SDSS (incl. own analysis), Galex, 2MASS
# DATE: 2014-09-09
# VERSION: 1.0
# COLAPRV: CJW 
# PUBAPRV: None 

This catalogue presents a match of UV, optical and NIR photometric data. 
All magnitudes are on the AB system. 

The optical growth curve magnitudes from the SDSS images are given in the 
file CALIFA_4_MS_GC_mag.txt. 

The Galex photometry is described in Catalan-Torrecilla et al. (2015, A&A 584, 87). 

The 2MASS photometry is from the 2MASS All-Sky Extended Source Catalog (XSC) 
catalog providing J,H,Ks photometry. It was retrieved directly from the 
NASA/IPAC Infrared Science Archive at 
http://irsa.ipac.caltech.edu/cgi-bin/Gator/nph-scan?mission=irsa&submit=Select&projshort=2MASS&BOLOCAM=bolocam_gps_v1_0_1&DENIS=denis3
The CALIFA galaxy coordinates were used to find extended 2MASS source 
entries within 20arcsec, with 924 positive matches. Please note that for 
some galaxies the 2MASS coordinates can be significantly of from the galaxy 
center by more than 10arcsec. 

This can have various reasons:
1. Confusion with a nearby bright star
2. Noise peaks due to the faintness of a galaxy
3. The NIR emission peaks off-center in the galaxy
This does not mean that the photometry is not reliable if the offset is 
large, but it might be beneficial to check the corresponding 2MASS image 
to be sure.

Information on the details about the 2MASS XSC photometry can be found at 
http://www.ipac.caltech.edu/2mass/releases/allsky/doc/sec4_5.html .
Followed by some cautionary notes http://www.ipac.caltech.edu/2mass/releases/allsky/doc/sec1_6c.html

Some magnitudes are not to be believed from visual inspection of the 
SEDs, or objects are simply not detected. For these the error on the 
magnitude was set to 30. A chi2 fitting code will thus disregard these 
magnitudes automatically. For any other application one may have to mask 
magnitudes with large errors, which should be easy to do.