J/A+A/609/A9 Local Swift-BAT AGN observed with Herschel (Lutz+, 2018)
Local Swift-BAT active galactic nuclei prefer circumnuclear star formation.
Lutz D., Shimizu T., Davies R.I., Herrera Camus R., Sturm E., Tacconi L.J.,
Veilleux S.
<Astron. Astrophys. 609, A9 (2018)>
=2018A&A...609A...9L 2018A&A...609A...9L (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Millimetric/submm sources
Keywords: galaxies: active - galaxies: structure
Abstract:
We use Herschel data to analyze the size of the far-infrared
70micrometer emission for z<0.06 local samples of 277 hosts of
Swift-BAT selected AGN, and 515 comparison galaxies that are not
detected by BAT. For modest far-infrared luminosities
8.5<log(LFIR)<10.5, we find large scatter of half light radii for both
populations, but a typical value ∼1kpc for the BAT hosts that is only
half that of comparison galaxies of same far-infrared luminosity. The
result mostly reflects a more compact distribution of star formation
(and hence gas) in the AGN hosts, but compact AGN heated dust may
contribute in some extremely AGN-dominated systems. Our findings are
in support of an AGN-host coevolution where accretion onto the central
black hole and star formation are fed from the same gas reservoir,
with more efficient black hole feeding if that reservoir is more
concentrated. The significant scatter in the far-infrared sizes
emphasizes that we are mostly probing spatial scales much larger than
those of actual accretion, and that rapid accretion variations can
smear the distinction between the AGN and comparison categories. Large
samples are hence needed to detect structural differences that favour
feeding of the black hole. No size difference AGN host vs. comparison
galaxies is observed at higher far-infrared luminosities
log(LFIR)>10.5 possibly because these are typically reached in more
compact regions.
Description:
Table A.1 lists the basic properties of the BAT AGN and reference
samples, and the derived far-infrared sizes. For guidance, part of the
table and related notes are also included in an appendix to the paper.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 79 792 BAT and reference samples
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 20 A20 --- Name Source name
22- 29 F8.4 deg RAdeg Right ascension (J2000)
31- 38 F8.4 deg DEdeg Declination (J2000)
40- 42 A3 --- Sample Member of BAT or reference (Ref) sample
44- 48 F5.3 kpc/arcsec Scale Adopted scale in kpc per arcsec
50 A1 --- l_Re70 Limit Flag for Re70
52- 57 F6.3 kpc Re70 Half light radius at 70um
59- 63 F5.3 kpc e_Re70 ? Error of Re70 (only statistical)
65- 67 I3 --- Band [70/100] Band used to derive Re70 (1)
69- 73 F5.2 [Lsun] logLFIR log10 of FIR 40-120micrometer luminosity
75- 79 F5.2 [10-7W] logLBAT ? log10 of BAT 14-195keV luminosity
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Note (1): Re70 is derived from Herschel-PACS 70um data, with few exceptions
where Re70 was scaled from Re100 (measured at 100um), using Re70=0.85*Re100.
These objects are marked 100 in the Band column
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Acknowledgements:
Dieter Lutz, lutz(at)mpe.mpg.de
(End) Dieter Lutz [MPE], Patricia Vannier [CDS] 13-Sep-2017