Sasmirala Individual Information for Fairall 9
Description
Fairall 9 is a spiral galaxy behind the Magellanic Stream at a redshift of z = 0.0470 (D ~ 199 Mpc) with a Sy 1.2 nucleus [veron-cetty_catalogue_2010] that belongs to the nine-month BAT AGN sample. Apart from IRAS, first N-band observations of Fairall 9 were performed with ISO [ramos_almeida_mid-infrared_2007], where an unresolved MIR nucleus was detected. It was also observed with Spitzer/IRAC, IRS and MIPS and appears also as a nearly-unresolved nuclear source without any extended host emission being detected. Three epochs of MIPS 24 μm images are available (2004, 2006, and 2010), which all provide the same source flux. The IRS LR staring-mode spectrum shows silicate 10 and 18 μm emission, weak PAH emission and a blue spectral slope in νFν-space (see also [shi_9.7_2006]). We observed Fairall 9 with VISIR in seven different narrow N-band filters in 17 observations spread over 2005 and 2010. The data from 2005 were analysed in [horst_small_2006, horst_mid-infrared_2009]. A compact nuclear MIR source without any extended host emission is visible in all images. The nucleus is unresolved in the sharpest PAH1 images and thus classified as unresolved in the MIR at subarcsecond resolution. The VISIR photometry agrees in general well with the Spitzer spectrophotometry and the ISO measurements. Only the PAH2_2 flux from 2010 is significantly lower for unknown reasons.
- [horst_mid-infrared_2009] H. Horst, W. J. Duschl, P. Gandhi, and A. Smette. Mid-infrared imaging of 25 local AGN with VLT-VISIR . A&A , 495 pp. 137–146, February 2009.
- [horst_small_2006] H. Horst, A. Smette, P. Gandhi, and W. J. Duschl. The small dispersion of the mid IR - hard x-ray correlation in active galactic nuclei . A&A , 457 pp. L17–L20, October 2006.
- [ramos_almeida_mid-infrared_2007] C. Ramos Almeida, A. M. Pérez García, J. A. Acosta-Pulido, and J. M. Rodríguez Espinosa. The mid-infrared emission of seyfert galaxies: A new analysis of ISOCAM data . AJ , 134 pp. 2006–2019, November 2007.
- [shi_9.7_2006] Y. Shi, G. H. Rieke, D. C. Hines, V. Gorjian, M. W. Werner, K. Cleary, F. J. Low, P. S. Smith, and J. Bouwman. 9.7 μm silicate features in active galactic nuclei: New insights into unification models . ApJ , 653 pp. 127–136, December 2006.
- [veron-cetty_catalogue_2010] M.-P. Véron-Cetty and P. Véron. A catalogue of quasars and active nuclei: 13th edition . A&A , 518 pp. 10, July 2010.
Images
Optical image (DSS, red filter). Displayed are the central 4 arcmin with North being up and East to the left. The colour scaling is linear with white corresponding to the median background (BG) and black to the 0.01% pixels with the highest intensity.
Spitzer MIR images. Displayed are the inner 40 arcsec with North being up and East to the left. The colour scaling is logarithmic with white corresponding to median BG and black to the 0.1% pixels with the highest intensity. The label in the bottom left states instrument and central wavelength of the filter in micron (I: IRAC, M: MIPS).
Subarcsecond-resolution MIR images sorted by increasing filter central wavelength. Displayed are the inner 4 arcsec with North being up and East to the left. The colour scaling is logarithmic with white corresponding to median BG and black to the 75% of the highest intensity of all images in units of sig_bg. The inset image (where present; either bottom or top right) shows the central arcsecond of the PSF from the calibrator star, scaled to match the science target. The labels in the bottom left state instrument and filter names (C: COMICS, M: Michelle, T: T-ReCS, V: VISIR).
SEDs
MIR SED. The description of the symbols in all the SED plots (where present) is the following: Grey crosses and solid lines mark the Spitzer/IRAC, MIPS and IRS data. The colour coding of the other symbols is as follows: green for COMICS, magenta for Michelle, blue for T-ReCS and red for VISIR data. Darker-coloured solid lines mark spectra of the corresponding instrument. The black filled circles mark the nuclear 12 and 18 micron continuum emission estimate from the data (where present). The ticks on the top axis mark positions of common MIR emission lines, while the light grey horizontal bars mark wavelength ranges affected by the silicate 10 and 18 micron features.