Galex Release EMphot 3

Images

NUV

FUV

Image from the GALEX Pipeline Image from the GALEX Pipeline

Image from the GALEX Pipeline

Intensity map (J2000). GALEX FOV image in counts per second per pixel, corrected for relative response.

FITS (NUV), FITS (FUV)

Residual image Residual image

Residual image

Galex image minus the EMPhot simulated objects and the background, with masked regions in green.

FITS (NUV), FITS (FUV)


Catalog comparison - EMPhot versus GALEX Pipeline

The following plots are made with all sources (stars and galaxies). The source matching between EMPhot and GALEX positions is done by finding sources within a 2" radius. The magnitudes are not corrected from the galactic extinction.

NUV

FUV

Histogram of magnitudes Histogram of magnitudes

Histogram of magnitudes

Count per square degree and per mag with the sources estimated by EMPhot and the GALEX pipeline (including stars). In the NUV band the magnitude is corrected from the bias due to the background.

SNR from the estimated error SNR from the estimated error

SNR from the estimated error

With the error estimated from the residual.

Scatter plot of the difference Scatter plot of the difference

Scatter plot of the difference

Isolated sources (distance to the nearest neighbor greater than 10") are the cyan dots. the mean and standard deviation is given for the isolated compact (blue points) and extended (red points) sources.


Simulations

NUV

FUV

Histogram of the estimated magnitude Histogram of the estimated magnitude

Histogram of the estimated magnitude

With a color-coded error between the simulated and estimated magnitudes: blue for an absolute error smaller than 0.3 mag., green and yellow for an error greater than 0.3 mag.

The bottom plot show the percentage of detected objects for three SNR thresholds.

Scatter plot of the magnitude true error Scatter plot of the magnitude true error

Scatter plot of the magnitude true error

With the mean and standard deviation of the magnitude true error.

Scatter plot of the flux true error Scatter plot of the flux true error

Scatter plot of the flux true error

With the mean and standard deviation of the flux true error.

Standard deviation of fluxes Standard deviation of fluxes

Standard deviation of fluxes

With flux errors converted to a magnitude scale.

Estimated SNR from residual Estimated SNR from residual

Estimated SNR from residual

With a comparison to the theoretical SNR.