Nicole Drakos

Research Blog

Welcome to my Research Blog.

This is mostly meant to document what I am working on for myself, and to communicate with my colleagues. It is likely filled with errors!

This project is maintained by ndrakos

Make Mosaic Image

I want to make a pretty image of the DREaM mosaic for the paper. I’m going to use the code Trilogy

Mosaic files

There are 20 tiles, each with four different filters (80 FITS files). There are also two different resolutions (60mas and 30 mas). I’ll be working with the 60 mas files, since they are smaller.

I downloaded the A1 file, but strangely the file sizes are different — they are 12 GB for the F115W and F150W files, but 5 GB for the F266 and F444 files. I’m not sure why this should be the case if they are the same resolution. It seems what is different in the FITS files is the parameter “PXSCLRT”, the “Pixel scale ratio relative to native detector”. I’ll need to check in about this.

Running Trilogy


B
mosaic_nircam_f115w_DREaM_COSMOS-Web_60mas_A1_i2d.fits[1]

G
mosaic_nircam_f150w_DREaM_COSMOS-Web_60mas_A1_i2d.fits[1]

R
mosaic_nircam_f277w_DREaM_COSMOS-Web_60mas_A1_i2d.fits[1]
mosaic_nircam_f444w_DREaM_COSMOS-Web_60mas_A1_i2d.fits[1]

indir  /Users/nicoledrakos/Work/Research/Projects/CW_Image/mosaics
outname  test
samplesize 1000
stampsize  1000
showstamps  0
satpercent  0.001
noiselum    0.15
colorsatfac  1
deletetests  0
sampledx  0
sampledy  0

Initial Results

Here are my initial results (low-resolution):

One thing that I noticed are some of the F444W galaxies seem to be oriented wrong compared to the other galaxies:

I need to dig into this, but I suspect that some of the visits weren’t updated with the correct orientations when the mosaic was made.

Playing with Parameters

Here’s how the tile changes with the new parameters (still very low resolution)

It doesn’t look that different from the initial parameters, but I’m pretty happy with that for now.

To Figure Out


« Crossmatch Catalog Part II
Crossmatch Catalog Part III »