Sasmirala Individual Information for Fairall 49
Description
Fairall 49 is an early-type galaxy at a redshift of z = 0.0200 (D ~ 83.2 Mpc) with a Sy 2 nucleus [trippe_multi-wavelength_2010] with polarized broad lines [lumsden_spectropolarimetry_2004]. It was observed with Spitzer/IRS and MIPS and appears as an unresolved nuclear source without extended host emission in the MIPS 24 μm images from 2004 and 2006. The measured fluxes agree with the IRS LR staring-mode spectrum well, which shows silicate 10 μm absorption and PAH emission. Thus, star formation is probably affecting the Spitzer data. The MIR spectrum is rather flat with a peak at ~ 17 μm in νFν-space. We observed Fairall 49 with VISIR in three narrow N-band filters on one night in 2010. The detected MIR nucleus appears elongated in particular in the ARIII and PAH2_2 images (FWHM(major axis)~ 0.7arcsec ~ 270 pc; PA~ 40∘). At least another epoch of subarcsecond MIR imaging will be necessary to confirm this extension. The nuclear VISIR photometry is consistent with the Spitzer spectrophotometry, but it would be significantly lower if the presence of subarcsecond-extended emission can be verified.
- [lumsden_spectropolarimetry_2004] S. L. Lumsden, D. M. Alexander, and J. H. Hough. Spectropolarimetry of compton-thin seyfert 2 galaxies . MNRAS , 348 pp. 1451–1458, March 2004.
- [trippe_multi-wavelength_2010] M. L. Trippe, D. M. Crenshaw, R. P. Deo, M. Dietrich, S. B. Kraemer, S. E. Rafter, and T. J. Turner. A multi-wavelength study of the nature of type 1.8/1.9 seyfert galaxies . ApJ , 725 pp. 1749–1767, December 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.