ATLASD2CPT - AT Large Area Survey (ATLAS) CDF-S & ELAIS-S1 1.4-GHz DR2 Components Catalog
The authors use the term 'component' to refer to an isolated region of emission that is best described by a single 2D elliptical Gaussian. Blended regions of contiguous emission may consist of multiple individual components. Following the terminology from Hales et al. (2012, MNRAS, 425, 979), a 'blob' is an agglomerated island of pixels above an SNR cutoff, which may encapsulate a single component or a blended region of emission. In Section 6 of the reference paper, the authors use the term 'source' to refer to single or multiple components belonging to the same astronomical object.
This HEASARC table contains the ATLAS 1.4 GHz DR2 component catalog, a portion of which is displayed in Table A1 of the reference paper for guidance regarding its form and content. The catalog lists a total of 2,588 components in total intensity and linear polarization; no components were discovered in circular polarization. A list of the ATLAS 1.4 GHz DR2 sources, a portion of which is displayed in Table B1 of the reference paper for guidance regarding its form and content, is not included in this HEASARC table.
ATLAS 1.4 GHz Data Release 2 - I. Observations of the CDF-S and ELAIS-S1 fields and methods for constructing differential number counts Hales C.A., Norris R.P., Gaensler B.M., Middelberg E., Chow K.E., Hopkins A.M., Huynh M.T., Lenc E., Mao M.Y. <Mon. Not. Royal Astr. Soc. 441, 2555 (2014)> =2014MNRAS.441.2555H
The component identification number. This gives the internal designation of the component used within the data processing. The form is a composite of three descriptors plus an optional fourth. The first is a single character that represents the ATLAS field, given by C for CDF-S or E for ELAIS-S1. The second descriptor is a single character that represents the nature of detection, given by T for total intensity or L for linear polarization. The third descriptor is an integer that gives the blob identification number assigned by BLOBCAT (cf. Section 5.1 of the reference paper). The fourth descriptor is only suffixed for those components that were obtained through refitting all or part of the original blob using IMFIT, denoted by Cj, or BLOBCAT, denoted by Fj, for the jth extracted component from a given blob.
The full ATLAS DR2 component name. This has been provided in a form acceptable for International Astronomical Union (IAU) designation (Lortet, Borde & Ochsenbein 1994, A&AS, 107, 193). The form is 'ATLAS2 JHHMMSS.ss+DDMMSS.sC', where ATLAS2 is the survey acronym, 'J' specifies the J2000.0 coordinate equinox, 'HHMMSS.ss' are the hours, minutes and truncated (not rounded) seconds of Right Ascension, '+' or '-' is the sign of the Declination, 'DDMMSS.s' are the degrees, arcminutes and truncated arcseconds of the Declination, and the final single character specifier 'C' indicates the nature of the detection as 'T' (total intensity) or 'L' (linear polarization). Note that that the HEASARC has removed the '_' character that was included in these names by the authors, viz., 'ATLAS2_JHHMMSS.ss+DDMMSS.sC'.
The Right Ascension of the intensity-weighted centroid of the 1.4-GHz component in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-6 degrees in the original table.
The Declination of the intensity-weighted centroid of the 1.4-GHz component in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-6 degrees in the original table.
The Galactic Longitude of the intensity-weighted centroid of the 1.4-GHz component.
The Galactic Latitude of the intensity-weighted centroid of the 1.4-GHz component.
The absolute astrometric uncertainty in RA, in arcseconds. The minimum and maximum errors are 0.11 and 1.1 arcseconds in Right Ascension, and 0.17 and 2.1 arcseconds in Declination, respectively.
The absolute astrometric uncertainty in Declination, in arcseconds. The minimum and maximum errors are 0.11 and 1.1 arcseconds in Right Ascension, and 0.17 and 2.1 arcseconds in Declination, respectively.
The signal-to-noise ratio of the raw detection of the 1.4-GHz component.
The local rms noise value, in mJy/beam, near the radio component.
The local bandwidth smearing (chromatic aberration) value at the position of the radio component, cf. Section 4.2 of the reference paper.
The peak surface brightness (Speak) of the 1.4-GHz component corrected for the effect of bandwidth smearing, in mJy/beam.
The rms error in the peak surface brightness of the 1.4-GHz component corrected for the effect of bandwidth smearing, in mJy/beam.
The integrated surface brightness (Sint) of the 1.4-GHz component, in mJy.
The rms error in the integrated surface brightness of the 1.4-GHz component, in mJy.
The visibility area for the 1.4-GHz component. This is the fraction of the survey area over which the blob could have been detected due to rms noise and bandwidth smearing fluctuations.
If the 1.4-GHz component is not resolved, this parameter is set to '<'.
The estimated deconvolved angular size (or upper bound thereof if the parameter angular_size_limit = '<'), Theta, in arcseconds. If the angular-size_error value is not null, then the component is resolved with a flux density given by Sint (the int_flux_1p4_ghz parameter). If the angular_size_error value is null, then the component is unresolved with the quoted angular_size value representing an upper bound to the deconvolved angular size, and the component flux density is given by Speak (the flux_1p4_ghz parameter).
The rms error in the estimated deconvolved angular size, Theta, in arcseconds. This is not given if the component is unresolved.
The deboosted flux density of the 1.4-GHz component, in mJy. See Section 5.4 of the reference paper for more details on the deboosting procedures.