Bootes master catalogue¶
Preparation of NDWFS data¶
The catalogue comes from dmu0_NDWFS.
In the catalogue, we keep:
- The identifier (it's unique in the catalogue);
- The position;
- The stellarity;
- The magnitude for each band in 2 arcsec aperture.
- The kron magnitude to be used as total magnitude (no “auto” magnitude is provided).
We don't know when the maps have been observed. We will use the year of the reference paper.
In [1]:
from herschelhelp_internal import git_version
print("This notebook was run with herschelhelp_internal version: \n{}".format(git_version()))
In [2]:
%matplotlib inline
#%config InlineBackend.figure_format = 'svg'
import matplotlib.pyplot as plt
plt.rc('figure', figsize=(10, 6))
from collections import OrderedDict
import os
from astropy import units as u
from astropy.coordinates import SkyCoord
from astropy.table import Column, Table
import numpy as np
from herschelhelp_internal.flagging import gaia_flag_column
from herschelhelp_internal.masterlist import nb_astcor_diag_plot, remove_duplicates
from herschelhelp_internal.utils import astrometric_correction, mag_to_flux
In [3]:
OUT_DIR = os.environ.get('TMP_DIR', "./data_tmp")
try:
os.makedirs(OUT_DIR)
except FileExistsError:
pass
RA_COL = "ndwfs_ra"
DEC_COL = "ndwfs_dec"
I - Column selection¶
1.i - Aperture correction¶
TODO
In [4]:
imported_columns = OrderedDict({
'ndwfs_name': "ndwfs_id",
'ra': "ndwfs_ra",
'dec': "ndwfs_dec",
'k_class_star': "ndwfs_stellarity",
'r_mag_aper_02': "m_ap_mosaic_r",
'r_magerr_aper_02': "merr_ap_mosaic_r",
'r_mag_auto': "m_mosaic_r",
'r_magerr_auto': "merr_mosaic_r",
'i_mag_aper_02': "m_ap_mosaic_i",
'i_magerr_aper_02': "merr_ap_mosaic_i",
'i_mag_auto': "m_mosaic_i",
'i_magerr_auto': "merr_mosaic_i",
'b_mag_aper_02': "m_ap_mosaic_b",
'b_magerr_aper_02': "merr_ap_mosaic_b",
'b_mag_auto': "m_mosaic_b",
'b_magerr_auto': "merr_mosaic_b",
'k_mag_aper_02': "m_ap_mosaic_k",
'k_magerr_aper_02': "merr_ap_mosaic_k",
'k_mag_auto': "m_mosaic_k",
'k_magerr_auto': "merr_mosaic_k"
})
catalogue = Table.read("../../dmu0/dmu0_NDWFS/data/NDWFS_MLselected_20160801.fits")[list(imported_columns)]
for column in imported_columns:
catalogue[column].name = imported_columns[column]
epoch = 2011
# Clean table metadata
catalogue.meta = None
In [5]:
# Adding flux and band-flag columns
for col in catalogue.colnames:
if col.startswith('m_'):
errcol = "merr{}".format(col[1:])
# Some object have a magnitude to 0, we suppose this means missing value
mask = (catalogue[col] <= 0) | (catalogue[col] > 90.)
catalogue[col][mask] = np.nan
catalogue[errcol][mask] = np.nan
flux, error = mag_to_flux(np.array(catalogue[col]), np.array(catalogue[errcol]))
# Fluxes are added in µJy
catalogue.add_column(Column(flux * 1.e6, name="f{}".format(col[1:])))
catalogue.add_column(Column(error * 1.e6, name="f{}".format(errcol[1:])))
# Band-flag column
if "ap" not in col:
catalogue.add_column(Column(np.zeros(len(catalogue), dtype=bool), name="flag{}".format(col[1:])))
# TODO: Set to True the flag columns for fluxes that should not be used for SED fitting.
catalogue["ndwfs_stellarity"][catalogue["ndwfs_stellarity"] < 0.] = np.nan
In [6]:
catalogue[:10].show_in_notebook()
Out[6]:
II - Removal of duplicated sources¶
We remove duplicated objects from the input catalogues.
In [7]:
SORT_COLS = ['merr_ap_mosaic_b', 'merr_ap_mosaic_i', 'merr_ap_mosaic_r', 'merr_ap_mosaic_k']
FLAG_NAME = 'ndwfs_flag_cleaned'
nb_orig_sources = len(catalogue)
catalogue = remove_duplicates(catalogue, RA_COL, DEC_COL, sort_col=SORT_COLS,flag_name=FLAG_NAME)
nb_sources = len(catalogue)
print("The initial catalogue had {} sources.".format(nb_orig_sources))
print("The cleaned catalogue has {} sources ({} removed).".format(nb_sources, nb_orig_sources - nb_sources))
print("The cleaned catalogue has {} sources flagged as having been cleaned".format(np.sum(catalogue[FLAG_NAME])))
III - Astrometry correction¶
We match the astrometry to the Gaia one. We limit the Gaia catalogue to sources with a g band flux between the 30th and the 70th percentile. Some quick tests show that this give the lower dispersion in the results.
In [8]:
gaia = Table.read("../../dmu0/dmu0_GAIA/data/GAIA_Bootes.fits")
gaia_coords = SkyCoord(gaia['ra'], gaia['dec'])
In [9]:
nb_astcor_diag_plot(catalogue[RA_COL], catalogue[DEC_COL],
gaia_coords.ra, gaia_coords.dec)
In [10]:
delta_ra, delta_dec = astrometric_correction(
SkyCoord(catalogue[RA_COL], catalogue[DEC_COL]),
gaia_coords
)
print("RA correction: {}".format(delta_ra))
print("Dec correction: {}".format(delta_dec))
In [11]:
catalogue[RA_COL] += delta_ra.to(u.deg)
catalogue[DEC_COL] += delta_dec.to(u.deg)
In [12]:
nb_astcor_diag_plot(catalogue[RA_COL], catalogue[DEC_COL],
gaia_coords.ra, gaia_coords.dec)
IV - Flagging Gaia objects¶
In [13]:
catalogue.add_column(
gaia_flag_column(SkyCoord(catalogue[RA_COL], catalogue[DEC_COL]), epoch, gaia)
)
In [14]:
GAIA_FLAG_NAME = "ndwfs_flag_gaia"
catalogue['flag_gaia'].name = GAIA_FLAG_NAME
print("{} sources flagged.".format(np.sum(catalogue[GAIA_FLAG_NAME] > 0)))
V - Saving to disk¶
In [15]:
catalogue.write("{}/NDWFS.fits".format(OUT_DIR), overwrite=True)