ACT (ACTPol) Data Products - Point Source Catalog

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actpol_ps_cat_get.html

Description

Point Source Catalog
The file ACTPol-D56_sources.fits is a FITS table that contains the catalog of sources detected in the ACTPol map of the region which we call Deep56 (D56) observed during the second season (2014) of ACTPol observations. This region covers 680 square degrees of the sky between Declination -8.8 and 5.2 degrees and RA greater than 352 degrees and less than 40.6 degrees. The 2014 (S14) D56 catalog includes 581 sources above a 148 GHz flux density limit of 10 mJy (before deboosting) that were detected at a significance larger than 4.5-sigma in total intensity. The completeness and purity of this catalog are both greater than 97% above 10 mJy. Measurements of the Stokes Q and U amplitudes are reported for 169 sources that are brighter than 30 mJy in total intensity. Measurements of fractional polarization are reported for 65 sources, 25 of which were detected at a significance larger than 3-sigma in polarized intensity. Polarization angle measurements are also reported for these 25 sources following the IAU standard for polarization angle. The FITS table includes the information from Table A4 in the paper titled Two-season ACTPol Extragalactic Point Sources and their Polarization Properties (2018), arXiv, MNRAS. It can be read into Python using the astropy.table module.

The columns contain the following information:

Column Name Description
Name Name of the source (asterisk indicates that the source is irregular/extended)
RA J2000 right ascension of the source in hh:mm:ss
dec J2000 declination of the source in deg:min:sec
RA [deg] J2000 right ascension of the source in decimal degrees
dec [deg] J2000 declination of the source in decimal degrees
SNR Signal-to-noise ratio of the detection in total intensity
T_CMB [uK] Source amplitude in CMB temperature units (microKelvin)
T_CMB_err [uK] 1-sigma uncertainty in the measured source amplitude in CMB temperature units (microKelvin)
Stokes_Q [uK] Stokes Q amplitude in CMB temperature units (microKelvin) for sources brighter than 30 mJy in total intensity
Stokes_Q_err [uK] 1-sigma uncertainty in the measured Stokes Q amplitude in CMB temperature units (microKelvin)
Stokes_U [uK] Stokes U amplitude in CMB temperature units (microKelvin) following the IAU standard for sources brighter than 30 mJy in total intensity
Stokes_U_err [uK] 1-sigma uncertainty in the measured Stokes U amplitude in CMB temperature units (microKelvin)
S_raw [mJy] Raw measured flux density in milliJansky units at 147.6 GHz (assumes a source spectral index of -0.7)
S_raw_err [mJy] 1-sigma uncertainty in the raw measured flux density in milliJansky units at 147.6 GHz (does not include uncertainty in the measurement of the band central frequency and assumes a source spectral index of -0.7)
S_deb [mJy] Deboosted flux density in milliJansky units (only sources dimmer than 100 mJy are deboosted)
S_deb_err_Minus [mJy] Negative 1-sigma error in the deboosted flux density in milliJansky units
S_deb_err_Plus [mJy] Positive 1-sigma error in the deboosted flux density in milliJansky units
SNR_p Signal-to-noise ratio in polarization
p_WK [%] Percentage fractional polarization estimated using the Wardle-Kronberg estimator
p_WK_err_Minus [%] Negative 1-sigma error in the percentage fractional polarization as estimated using the Wardle-Kronberg estimator
p_WK_err_Plus [%] Positive 1-sigma error in the percentage fractional polarization as estimated using the Wardle-Kronberg estimator
p_x [%] Percentage fractional polarization estimated using the 2-way data splits
p_x_err_Minus [%] Negative 1-sigma error in the percentage fractional polarization as estimated using the 2-way data splits
p_x_err_Plus [%] Positive 1-sigma error in the percentage fractional polarization as estimated using the 2-way data splits
pol_ang [deg] Polarization angle of the source (only for sources detected in polarization at a significance larger than 3-sigma)
pol_ang_err [deg] 1-sigma uncertainty in the polarization angle measurement
Variability flag The flag V indicates that the variation in the measured source flux density between the 2013 (S13) and 2014 (S14) observing seasons is greater than 40%
cross_match_VLAF Y indicates that the source has a cross-match in the VLA FIRST 1.4 GHz catalog
cross_match_AT20G Y indicates that the source has a cross-match in the AT20G 20 GHz catalog
cross_match_SPIRE Y indicates that the source has a cross-match in the Herschel SPIRE 600 GHz catalog

The files ACTPol-D5_sources.fits and ACTPol-D6_sources.fits are FITS tables that contain the catalog of sources detected in the ACTPol maps of the regions which we call Deep5 (D5) and Deep6 (D6) observed during the first season (2013) of ACTPol observations. The D5 region covers 181 square degrees of the sky between Declination -3.8 and 4.8 degrees and RA greater than 350 degrees and less than 4.6 degrees. The D6 region covers 160 square degrees of the sky between Declination -8.4 and 0 degrees and RA between 26 and 42 degrees. The 2013 (S13) D5 and D6 catalogs include 132 and 235 sources above a 148 GHz flux density limit of 7 mJy and 5 mJy, respectively, that were detected at a significance larger than 4.5-sigma in total intensity. The completeness and purity of these catalogs are greater than 90% and 98%, respectively. Note that the D5 and D6 catalog tables do not include all columns from the list above.

For full details, refer to (Datta et al. 2018). .

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