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Published March 2018 | Published + Submitted
Journal Article Open

MALS–NOT: Identifying Radio-bright Quasars for the MeerKAT Absorption Line Survey


We present a preparatory spectroscopic survey to identify radio-bright, high-redshift quasars for the MeerKAT Absorption Line Survey. The candidates have been selected on the basis of a single flux density limit at 1.4 GHz (>200 mJy), together with mid-infrared color criteria from the Wide-field Infrared Survey Explorer. Through spectroscopic observations using the Nordic Optical Telescope, we identify 72 quasars out of 99 candidates targeted. We measure the spectroscopic redshifts based on characteristic, broad emission lines present in the spectra. Of these 72 quasars, 64 and 48 objects are at sufficiently high redshift (z > 0.6 and z > 1.4) to be used for the L-band and UHF-band spectroscopic follow-up with the Square Kilometre Array precursor in South Africa: the MeerKAT.

Additional Information

© 2018 American Astronomical Society. Received 2017 November 28. Accepted 2018 January 26. Published 2018 March 2. J.K.K. acknowledges financial support from the Danish Council for Independent Research (EU-FP7 under the Marie-Curie grant agreement No. 600207) with reference DFF-MOBILEX–5051-00115. A.R., N.G., R.S., P.N., and P.P.J. acknowledge the support from the Indo-French Centre for the Promotion of Advance Research (IFCPAR) under project No. 5504-2. This work is based on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. The Digitized Sky Survey is based on photographic data obtained using The UK Schmidt Telescope. The UK Schmidt Telescope was operated by the Royal Observatory Edinburgh, with funding from the UK Science and Engineering Research Council, until 1988 June, and thereafter by the Anglo-Australian Observatory. Original plate material is copyright of the the Royal Observatory Edinburgh and the Anglo-Australian Observatory. The plates were processed into the present compressed digital form with their permission. The Digitized Sky Survey was produced at the Space Telescope Science Institute under US Government grant NAG W-2166.

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Published - Krogager_2018_ApJS_235_10.pdf

Submitted - 1802.00482.pdf


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