Sasmirala Individual Information for ESO 209-12
Description
ESO 209-12 is a highly inclined spiral galaxy at a redshift of z = 0.0405 (D ~ 175 Mpc) hosting an AGN with optical Sy 1.5 classification [veron-cetty_catalogue_2010]. It was observed with Spitzer/IRAC and IRS, with which a compact MIR nucleus with extended host galaxy emission was detected. The shortest wavelength part of the IRS LR mapping-mode spectrum is missing, but the other part of the spectrum matches with the IRAC 5.8 and 8.0 μm photometry. Weak silicate and PAH emission is evident, while the spectral slope is rather flat in νFν-space with a maximum at ~ 18 μm. We observed ESO 209-12 with VISIR in 2007 in four narrow N-band filters (one epoch) and detected the nucleus but no host galaxy emission. The nucleus is unresolved in the sharpest images (PAH1 and SIV) and is thus classified as unresolved at subarcsecond scales in the MIR. Nuclear photometry of the PAH2 and NEII images was already published in [gandhi_resolving_2009]. Our new measurements are consistent with the previous values. The average subarcsecond flux level is ~ 13% lower than the Spitzer spectrophotometry.
- [gandhi_resolving_2009] P. Gandhi, H. Horst, A. Smette, S. Hönig, A. Comastri, R. Gilli, C. Vignali, and W. Duschl. Resolving the mid-infrared cores of local seyferts . A&A , 502 pp. 457–472, August 2009.
- [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.