ATLASSPECZ - AT Large Area Survey (ATLAS) Spectroscopic Classes & Redshifts Catalog

Overview

The Australia Telescope Large Area Survey (ATLAS) has surveyed 7 square degrees of sky around the Chandra Deep Field South (CDF-S) and the European Large Area ISO Survey-South 1 (ELAIS-S1) fields at 1.4 GHz. ATLAS aims to reach a uniform sensitivity of 10 µJy (µJy) beam^-1 rms over the entire region with first data release currently reaching ~ 30 uJy beam^-1 rms. Here the authors present 466 new spectroscopic redshifts for radio sources in ATLAS as part of their optical follow-up program. Of the 466 radio sources with new spectroscopic redshifts, 142 have star-forming optical spectra, 282 show evidence for active galactic nuclei (AGN) in their optical spectra, 10 have stellar spectra and 32 have spectra revealing redshifts, but with insufficient features to classify. The authors compare their spectroscopic classifications with two mid-infrared diagnostics and find them to be in broad agreement. ATLAS is a pathfinder for the forthcoming Evolution Map of the Universe (EMU) survey and the data presented in this paper will be used to guide EMU's survey design and early science papers.

This paper uses H₀ = 70 km s^-1 Mpc^-1, Omega_M = 0.3 and Omega_Lambda = 0.7, and the web-based calculator of Wright (2006, PASP, 118, 1711) to estimate the distance-dependent physical parameters.

Catalog Bibcode

2012MNRAS.426.3334M

References

The Australia Telescope Large Area Survey: spectroscopic catalogue and radio
luminosity functions.
    Mao M.Y., Sharp R., Norris R.P., Hopkins A.M., Seymour N., Lovell J.E.J.,
    Middelberg E., Randall K.E., Sadler E.M., Saikia D.J., Shabala S.S.,
    Zinn P.-C.
    <Mon. Not. Royal Astr. Soc. 426, 3334 (2012)>
    =2012MNRAS.426.3334M      (SIMBAD/NED BibCode)

Provenance

This table was created by the HEASARC in March 2013 based on an electronic version of Table 2 from the reference paper which was obtained from the MNRAS web site. Some of the values for the name parameter in the HEASARC's implementation of this table were corrected in April 2018.

Parameters

Source_ID
The source identifier from Norris et al. (2006, AJ, 132, 2409) and Middelberg et al. (2008, AJ, 135, 1276).

Name
The source designation ('[MSN2012] JHHMMSS.s-DDMMSS') using the MSN2012 prefix (for Mao, Sharp, Norris 2012) and the J2000.0 equatorial coordinates of the source. This was created by the HEASARC using the position-based IAU style recommended by the Dictionary of Nomenclature of Celestial Objects.

RA
The Right Ascension of the optical counterpart to the ATLAS radio source in the selected equinox. This was given in J2000.0 equatorial coordinates to a precision of 0.01 seconds of time in the original table.

Dec
The Declination of the optical counterpart to the ATLAS radio source in the selected equinox. This was given in J2000.0 equatorial coordinates to a precision of 0.01 arcseconds in the original table.

LII
The Galactic Longitude of the optical counterpart to the ATLAS radio source.

BII
The Galactic Latitude of the optical counterpart to the ATLAS radio source.

Flux_1p4_GHz
The radio source flux density at 20 cm (1.4 GHz), in mJy. The radio flux densities are from Norris et al. (2006, AJ, 132, 2409) and Middelberg et al. (2008, AJ, 135, 1276) and are uncorrected for effects such as bandwidth smearing.

Rmag
The SuperCOSMOS R-band Vega magnitude of the optical counterpart to the ATLAS radio source (Hambly et al. 2001, MNRAS, 326, 1279)

Bmag
The SuperCOSMOS B-band Vega magnitude of the optical counterpart to the ATLAS radio source (Hambly et al. 2001, MNRAS, 326, 1279)

Redshift
The spectroscopic redshift of the optical counterpart to the ATLAS radio source as determined herein.

Broad_Type
The spectroscopic classification of the optical counterpart to the ATLAS radio source as determined herein. In the course of measuring the redshift, each spectrum was inspected visually to determine whether the dominant physical process responsible for the radio emission was star formation (SF) or an AGN. SF galaxy spectra are typically dominated by strong, narrow emission lines including the Balmer series. The authors classified such spectra as 'SF'. AGN, on the other hand, can have pure absorption-line spectra ('E'), absorption-line spectra with some low-ionization emission lines such as [O II] 3726 and 3729 Angstrom ('E+OII'), emission-line spectra whose line ratios are indicative of AGN activity ('AGNa') and broad-line spectra ('AGNb'). Ten sources had stellar spectra (classified as 'mstar', 'gstar', etc.) and, upon visual inspection of the field, the authors attributed this to chance alignments and discarded these data from further analysis in this work.

Abs_Rmag
The absolute R-band magnitude of the optical counterpart to the ATLAS radio source.

Log_Lum_1p4_GHz
The 1.4-GHz monochromatic radio luminosity of the ATLAS radio source, in W Hz^-1.

Contact Person

Questions regarding the ATLASSPECZ database table can be addressed to the HEASARC Help Desk.

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Last Modified: Monday, 16-Sep-2024 17:24:49 EDT