NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-17 T21:56:33 PDT
Help | Comment | NED Home

For refcode 2016MNRAS.458.4512G:
Retrieve 33 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by Royal Astronomical Society. 2016MNRAS.458.4512G The nuclear and integrated far-infrared emission of nearby Seyfert galaxies Garcia-Gonzalez, J.; Alonso-Herrero, A.; Hernan-Caballero, A.; Pereira-Santaella, M.; Ramos-Almeida, C.; Acosta-Pulido, J. A.; Diaz-Santos, T.; Esquej, P.; Gonzalez-Martin, O.; Ichikawa, K.; Lopez-Rodriguez, E.; Povic, M.; Roche, P. F.; Sanchez-Portal, M. Abstract. We present far-infrared (FIR) 70-500 micron imaging observations obtained with Herschel/Photodetector Array Camera (PACS) and Spectral and Photometric Imaging REceiver (SPIRE) of 33 nearby (median distance of 30 Mpc) Seyfert galaxies from the Revised Shapley-Ames (RSA) catalogue. We obtain the FIR nuclear (r = 1 kpc and r = 2 kpc) and integrated spectral energy distributions (SEDs). We estimate the unresolved nuclear emission at 70 micron and we fit the nuclear and integrated FIR SEDs with a grey body model. We find that the integrated FIR emission of the RSA Seyferts in our sample is dominated by emission from the host galaxy, with dust properties similar to those of normal galaxies (non-AGN). We use four criteria to select galaxies whose nuclear 70 micron emission has a significant AGN contribution: (1) elevated 70/160 micron flux ratios, (2) spatially resolved, high dust temperature gradient, (3) 70 micron excess emission with respect to the fit of the FIR SEDs with a grey body, and (4) excess of nuclear SFR obtained from 70 micron over SFR from mid-infrared indicators. 16 galaxies (48 per cent of the initial sample) satisfy at least one of these conditions, whereas 10 satisfy half or more. After careful examination of these, we select six bona fide candidates (18 per cent of the initial sample) and estimate that ~40-70 per cent of their nuclear (r = 1-2 kpc) 70 micron emission is contributed by dust heated by the AGN. Key words: galaxies: active, infrared: galaxies
Retrieve 33 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home