Distances corrected for peculiar velocities

For each object within 6,400 km/s we provide an estimate of its distance corrected for peculiar velocities. We perform the correction using the beta=0.5 linear prediction based on the IRAS 1.2 Jy redshift survey density field.

The results are stored in:

$VAGC_REDUX/velmod_distance/distance_sigv150.fits

which has the following columns:

ZDIST: redshift corrected for peculiar velocity, in the Local Group frame of reference
ZDIST_ERR: estimated error on redshift (assumes velocity dispersion of 150 km/s)
ZLG: redshift in Local Group frame, uncorrected for peculiar velocities
ZACT: heliocentric redshift
RA, DEC: J2000 coordinates, in degrees

For objects outside of 6,400 km/s, ZDIST is simply equal to ZLG. For objects inside, it is the distance which maximizes the likelihood of observing that object.

The likelihood as a function of distance is contained in the file:

$VAGC_REDUX/velmod_distance/ldist_sigv150.fits

which has the columns for each object within 6,400 km/s

OBJECT_POSITION: position of the object in the object_sdss_imaging file
ZDIST: same as above
ZDIST_ERR: same as above
ZLG: same as above
ZACT: same as above
RA, DEC: same as above
DISTANCE: distance in km/s
DISTANCE_ERR: distance error in km/s
MAXLIKE: likelihood at maximum
DISTARR: array of distances (in km/s)
LIKEARR: likelihood at each distance

NYU Value-Added Galaxy Catalog