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J/MNRAS/439/1648    Subarcsecond mid-infrared atlas of local AGN  (Asmus+, 2014)

The subarcsecond mid-infrared view of local active galactic nuclei: I. The N- and Q-band imaging atlas. Asmus D., Hoenig S.F., Gandhi P., Smette A., Duschl W.J. <Mon. Not. R. Astron. Soc. 439, 1648 (2014)> =2014MNRAS.439.1648A (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Atlases ; Galaxies, IR ; Galaxies, nearby ; Galaxies, photometry ; Galaxies, Seyfert ; Photometry, infrared Keywords: atlases - galaxies: active - galaxies: nuclei - infrared: galaxies Abstract: We present the first subarcsecond-resolution mid-infrared (MIR) atlas of local active galactic nuclei (AGN). Our atlas contains 253 AGN with a median redshift of z=0.016, and includes all publicly available MIR imaging performed to date with ground-based 8-m class telescopes, a total of 895 independent measurements. Of these, more than 60% are published here for the first time. We detect extended nuclear emission in at least 21% of the objects, while another 19% appear clearly point-like, and the remaining objects cannot be constrained. Where present, elongated nuclear emission aligns with the ionization cones in Seyferts. Subarcsecond resolution allows us to isolate the AGN emission on scales of a few tens of parsecs and to obtain nuclear photometry in multiple filters for the objects. Median spectral energy distributions (SEDs) for the different optical AGN types are constructed and individual MIR 12 and 18um continuum luminosities are computed. These range over more than six orders of magnitude. In comparison to the arcsecond-scale MIR emission as probed by Spitzer, the continuum emission is much lower on subarcsecond scales in many cases. The silicate feature strength is similar on both scales and generally appears in emission (absorption) in type I (II) AGN. However, the polycyclic aromatic hydrocarbon emission appears weaker or absent on subarcsecond scales. The differences of the MIR SEDs on both scales are particularly large for AGN/starburst composites and close-by (and weak) AGN. The nucleus dominates over the total emission of the galaxy only at luminosities ≳1044erg/s. The AGN MIR atlas is well suited not only for detailed investigation of individual sources but also for statistical studies of AGN unification. Description: The Subarcsecond mid-infrared (MIR) atlas of local active galactic nuclei (AGN) is a collection of all available N- and Q-band images obtained at ground-based 8-meter class telescopes with public archives (Gemini/Michelle, Gemini/T-ReCS, Subaru/COMICS, and VLT/VISIR). It includes in total 895 images, of which 60% are perviously unpublished. These correspond to 253 local AGN with a median redshift of 0.016. The atlas contains the uniformly processed and calibrated images and nuclear photometry obtained through Gauss and PSF fitting for all objects and filters. This also includes measurements of the nuclear extensions. In addition, the classifications of extended emission (if present) and derived nuclear monochromatic 12 and 18 micron continuum fluxes are available. Finally, flux ratios with the circumnuclear MIR emission (measured by Spitzer) and total MIR emission of the galaxy (measured by IRAS) are presented. The observations have been taken in the mid-infrared (N-band, 7-13micron, and Q-band, 17-20micron) between 2003-12-02 and 2011-06-15 and cover the whole sky. The objects have redshifts between -0.0001 and 0.3571. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 134 253 Basic object properties and nuclear 12 & 18um continuum fluxes/ratios table2.dat 276 901 Photometric parameters for all nuclear measurements
See also: J/ApJ/610/128 : NIR colors of hard X-ray-selected AGN (Watanabe+, 2004) J/ApJ/680/130 : Mid-IR colors of AGNs in the MUSYC ECDF-S (Cardamone+, 2008) J/ApJ/705/14 : Seyfert galaxies in the mid-IR (Deo+, 2009) J/ApJ/725/2270 : Mid-IR emission lines in AGNs (Pereira-Santaella+, 2010) J/ApJS/208/24 : Spitzer MIR AGN survey. I. (Lacy+, 2013) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 23 A23 --- Name Common object name 25- 34 F10.6 deg RAdeg Right ascension (J2000.0) 36- 45 F10.6 deg DEdeg Declination (J2000.0) 47- 53 F7.4 --- z Redshift 55- 60 F6.1 Mpc Dist Distance (1) 62- 70 A9 --- Class Optical classification (2) 72 A1 --- Doubt [F/T] Uncertain AGN flag (3) 74- 76 I3 --- BATID ? BAT ID from 9-month catalog (from Winter et al., 2009ApJ...690.1322W) 78- 83 A6 --- ExtCl Nuclear MIR extension classification (4) 85 A1 --- l_F12um [F/T] Limit flag for the nuclear 12um flux (5) 87- 93 F7.1 mJy F12um Nuclear 12um restframe continuum flux (6) 95-100 F6.1 mJy e_F12um ? 1-sigma uncertainty of the 12um flux 102 A1 --- l_F18um [F/T] Limit flag for the nuclear 18um flux (7) 104-110 F7.1 mJy F18um ? Nuclear 18um restframe continuum flux 112-117 F6.1 mJy e_F18um ? 1-sigma uncertainty of the 18um continuum flux 119-122 I4 pc Dunr Size constraint on unresolved emission (8) 124-127 F4.2 --- N/I ? Flux ratio of nuclear to intermediate scale (9) 129-134 F6.4 --- N/L ? Flux ratio of nuclear to large scale (10)
Note (1): Mostly redshift-based luminosity distance, corrected for the Earth's motion relative to the cosmic microwave background reference frame with H0=67.3, Omegam=0.315, and Omegavac=0.685, or redshift-independent distance (See App. B of the paper). Note (2): References for the collected optical AGN classifications are given in App. B of the paper. Note (3): If 'T' (True), the presence of an AGN is uncertain (App. B of the paper). Note (4): nuclear morphology at subarcsecond resolution as follows: - = point-like o = possibly extended ? = unknown extension circ. = spherical extended ellip. = elliptical and bar-like extended spir. = spiral-like extended comp. = complex extended emission Note (5): if 'T' (True) the object was not detected at 12um. In that case, F12um represents the 3-sigma upper limit. Note (6): nuclear subarcsecond-scale monochromatic flux density at restframe 12micron. Note (7): if 'T' (True) the object was not detected at 18um. In that case, F18um represents the 3-sigma upper limit. Note (8): size constraint on the nuclear unresolved emission in pc, which is set equal to the minimum PSF FWHM (major axis) measured for the object. Note (9): The in Spitzer/IRS unresolved flux component is used as measure for the intermediate-scale emission. Note (10): The IRAS 12micron flux is used as measure for the large-scale emission.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 23 A23 --- Name Common object name 25- 34 F10.6 deg RAdeg Right ascension (J2000.0) 36- 45 F10.6 deg DEdeg Declination (J2000.0) 47- 53 A7 --- Filter Filter name 55- 59 F5.2 um lambc Filter central wavelength (observing frame) 61- 64 F4.2 um HWHM Filter half-width-half-maximum 66- 73 A8 --- Inst Instrument used to obtain data 75- 79 F5.3 arcsec/pix Scale Pixel size of field of view 81- 84 I4 s ExpTim Total exposure time on-source 86- 89 A4 --- ChpMod Chop & nod mode 91- 92 I2 arcsec ChpThw Chop throw 94- 97 I4 deg ChpAng Chop angle East of North 99-102 I4 deg InsRot Instrument rotation angle on sky, W of N 104-119 A16 --- ProgID Observation programme ID 121-132 A12 --- CalStr Calibrator star name 134-149 A16 --- CalDat Calibrator star obervational date 151-159 F9.3 d CalMJD ? Calibrator star obervational MJD 161-176 A16 --- ObsDat Obervational date 178-186 F9.3 d ObsMJD Obervational MJD 188-195 F8.5 mJy/ct CnvFac Conversion factor measured from the Cal 197-203 F7.5 mJy/ct e_CnvFac 1-sigma uncertainty of the Conv. factor 205-214 F10.1 mJy CalFlx ? Calibrator star flux 216 A1 --- l_FGau [F/T] Limit flag on the Gauss flux (1) 218-224 F7.1 mJy FGau Nuclear flux from 2D Gauss fitting 226-231 F6.1 mJy e_FGau ? 1-sigma uncertainty of the Gauss flux 233 A1 --- l_FPSF [F/T] Limit flag on the PSF flux (2) 235-241 F7.1 mJy FPSF Nuclear flux from PSF scaling 243-248 F6.1 mJy e_FPSF ? 1-sigma uncertainty of the PSF flux 250-253 F4.2 arcsec CalMaj ? Calibrator Star major axis FWHM 255-258 F4.2 arcsec CalMin ? Calibrator Star minor axis FWHM 260-262 I3 deg CalPA ? Calibrator Star position angle E of N 264-267 F4.2 arcsec amaj ? Major axis FWHM (constrained to ≤1arcsec) 269-272 F4.2 arcsec bmaj ? Minor axis FWHM (constrained to ≤1arcsec) 274-276 I3 deg PA ? Position angle of Gauss fit East of North
Note (1): if 'T' (True) the object was not detected. In that case, FGau represents the 3-sigma upper limit. Note (2): if 'T' (True) the object was not detected or no matching Calibrator Star was available. In that case, FPSF represents the 3-sigma upper limit.
Acknowledgements: Daniel Asmus, asmus(at)
(End) Daniel Asmus [MPIfR, Germany], Patricia Vannier [CDS] 12-Mar-2014
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