TABLE 1. 2MASS Extended Source Catalog Key Parameters

Parameter

Description

ra

right ascension (J2000) in degrees; based on peak pixel

dec

declination (J2000) in degrees; based on peak pixel

density

Atlas image stellar number density:

log(stars per deg2) with Ks < 14 mag

<band>_ba

<band> minor/major axis ratio fit to the 3 isophote

<band>_phi

<band> angle to 3 major axis (E of N)

j_chif_ellf

%chi-fraction for ellipse fit to 3 J-band isophote

k_chif_ellf

%chi-fraction for ellipse fit to 3 Ks-band isophote

sup_ba

minor/major axis ratio fit to 3 super-Atlas Image isophote

sup_phi

super-Atlas Image angle to major axis (E of N)

sup_chif_ellf

%chi-fraction for ellipse fit to super-Atlas Image 3 isophote

r_k20fe

20 mag/arcsec2 isophotal-Ks fiducial

elliptical aperture semi-major axis

<band>_m_k20fe

<band> 20mag/arcsec2 isophotal fiducial

elliptical aperture magnitude

<band>_msig_k20fe

<band> 1 uncertainty in <band>_m_k20fe

<band>_flg_k20fe

<band> confusion flag for <band>_m_k20fe

<band>_m_7

<band> 7´´ radius circular aperture magnitude

<band>_msig_7

<band> 1 uncertainty in 7´´ circular ap. mag

<band>_flg_7

<band> confusion flag for 7´´ circular ap. mag

<band>_peak

<band> peak pixel surface brightness (mag/arcs2)

<band>_5surf

<band> mean surface brightness (r 5´´ ) (mag/arcs2)

<band>_sc_sh

<band> "shape" score; a.k.a. SH

<band>_sc_wsh

<band> "wsh" score; a.k.a. WSH

<band>_sc_r23

<band> r23 score; a.k.a. R23

<band>_bisym_rat

<band> bi-symmetric flux ratio

<band>_bisym_chi

<band> bi-symmetric cross-correlation 2

e_score

extended source probability

(1.0 = fuzziest; 2.0 = pointlike)

g_score

galaxy probability (1.0 = fuzziest; 2.0 = pointlike)

Table Notes: <band> refers to the J, H and Ks bands.

Return to Section IV.5.