Sasmirala Individual Information for ESO 506-27
Description
ESO 506-27 is an edge-on spiral galaxy at a redshift of z = 0.0250 (D ~ 110 Mpc) hosting a Sy 2 nucleus [veron-cetty_catalogue_2010]. It belongs to the nine-month BAT AGN sample and is an X-ray “buried” AGN candidate [noguchi_new_2009]. ESO 506-27 was observed with Spitzer/IRS, and the LR staring-mode spectrum shows an extremely deep silicate 10 μm absorption feature (see also [mullaney_defining_2011]). Silicate 18 μm absorption and PAH emission seems present as well but less prominent. The general MIR spectral slope is blue in νFν-space. We observed ESO 506-27 with VISIR in three narrow N-band filters in one night of 2010 and detected a compact MIR nucleus without any sign of extended host emission. The nucleus is unresolved in the sharper SIV and PAH2_2 images and thus classified as unresolved in the MIR at subarcsecond scales. The corresponding photometric measurements agree with the IRS spectrum and indicate the same deep silicate feature. Therefore, we use the IRS spectrum to correct our 12 μm continuum emission estimate for the silicate feature.
- [mullaney_defining_2011] J. R. Mullaney, D. M. Alexander, A. D. Goulding, and R. C. Hickox. Defining the intrinsic AGN infrared spectral energy distribution and measuring its contribution to the infrared output of composite galaxies . MNRAS , page 474, April 2011.
- [noguchi_new_2009] Kazuhisa Noguchi, Yuichi Terashima, and Hisamitsu Awaki. A new sample of buried active galactic nuclei selected from the second XMM-Newton serendipitous source catalogue . ApJ , 705 pp. 454–467, November 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.
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.