Mon. Not. R. Astron. Soc., 494, 1784-1816 (2020/May-2)
Local AGN survey (LASr): I. Galaxy sample, infrared colour selection, and predictions for AGN within 100 Mpc.
ASMUS D., GREENWELL C.L., GANDHI P., BOORMAN P.G., AIRD J., ALEXANDER D.M., ASSEF R.J., BALDI R.D., DAVIES R.I., HONIG S.F., RICCI C., ROSARIO D.J., SALVATO M., SHANKAR F. and STERN D.
Abstract (from CDS):
To answer major questions on supermassive black hole (SMBH) and galaxy evolution, a complete census of SMBH growth, i.e. active galactic nuclei (AGN), is required. Thanks to all-sky surveys by the Wide-field Infrared Survey Explorer (WISE) and the Spectrum-Roentgen-Gamma (SRG) missions, this task is now feasible in the nearby Universe. We present a new survey, the Local AGN Survey (LASr), with the goal of identifying AGN unbiased against obscuration and determining the intrinsic Compton-thick (CT) fraction. We construct the most complete all-sky galaxy sample within 100 Mpc (90 per cent completeness for log (M*/M☉) ∼ 9.4), four times deeper than the current reference, the Two Micron All-Sky Survey Redshift Survey (2MRS), which misses ∼20 per cent of known luminous AGN. These 49k galaxies serve as parent sample for LASr, called LASr-GPS. It contains 4.3k already known AGN, ≥82 per cent of these are estimated to have Lnuc(12 µm)< 1042.3 erg s–1, i.e. are low-luminosity AGN. As a first method for identifying Seyfert-like AGN, we use WISE-based infrared colours, finding 221 galaxies at Lnuc(12 µm)≥1042.3 erg s–1 to host an AGN at 90 per cent reliability. This includes 61 new AGN candidates and implies an optical type 2 fraction of 50-71 per cent. We quantify the efficiency of this technique and estimate the total number of AGN with Lint( 2-10keV)≥1042 erg s–1 in the volume to be 362+145–116 (8.6+3.5–2.8 ×10–5 Mpc–3). X-ray brightness estimates indicate the CT fraction to be 40-55 per cent to explain the Swift non-detections of the infrared selected objects. One third of the AGN within 100 Mpc remain to be identified, and we discuss the prospects for the eROSITA all-sky survey to detect them.
© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
galaxies: active - galaxies: Seyfert - infrared: galaxies - X-rays: galaxies
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