Sasmirala Individual Information for 3C 227
Description
3C 227 is a FR II radio source identified with the elliptical galaxy SDSS J094745.14+072520.5 at a redshift of z = 0.0858 (D ~ 414 Mpc), containing a radio-loud Sy 1.5 nucleus [veron-cetty_catalogue_2010]. In addition to the supergalactic-scale biconical radio lobes in the east-west directions (PA~ 90∘; e.g., [black_study_1992]), 3C 227 possesses one of the most extended emission line regions with our line of sight grazing the edge of the AGN ionization cone (> 200 kpc; [baum_extended_1988, prieto_extended_1993]). Spitzer/IRS and MIPS data are available for this object, in which it appears point-like. Our nuclear MIPS photometry matches the value given in [dicken_origin_2008]. The IRS LR mapping mode spectrum suffers from low S/N but clearly exhibits silicate emission and a shallow blue spectral slope in νFν-space (see also [dicken_spitzer_2012]). 3C 227 was imaged with VISIR in the SIC filter in 2006, and a compact nucleus was detected [van_der_wolk_dust_2010]. Our nuclear VISIR flux is consistent with the value by [van_der_wolk_dust_2010] and the Spitzer spectrophotometry. The silicate emission feature demonstrates the presence of warm dust in the central ~ 0.6 kpc of 3C 227.
- [baum_extended_1988] Stefi Alison Baum, Timothy M. Heckman, Alan Bridle, Wil J. M. van Breugel, and George K. Miley. Extended optical-line-emitting gas in radio galaxies - broad-band optical, narrow-band optical, and radio imaging of a representative sample . ApJS , 68 pp. 643–714, December 1988.
- [black_study_1992] A. R. S. Black, S. A. Baum, J. P. Leahy, R. A. Perley, J. M. Riley, and P. A. G. Scheuer. A study of FRII radio galaxies with z less than 0.15. i - high-resolution maps of eight sources at 3.6 CM . MNRAS , 256 pp. 186–208, May 1992.
- [dicken_origin_2008] D. Dicken, C. Tadhunter, R. Morganti, C. Buchanan, T. Oosterloo, and D. Axon. The origin of the infrared emission in radio galaxies. i. new mid- to far-infrared and radio observations of the 2 jy sample . ApJ , 678 pp. 712–728, May 2008.
- [dicken_spitzer_2012] D. Dicken, C. Tadhunter, D. Axon, R. Morganti, A. Robinson, M. B. N. Kouwenhoven, H. Spoon, P. Kharb, K. J. Inskip, J. Holt, C. Ramos Almeida, and N. P. H. Nesvadba. Spitzer mid-IR spectroscopy of powerful 2 jy and 3CRR radio galaxies. i. evidence against a strong starburst-AGN connection in radio-loud AGN . ApJ , 745 pp. 172, February 2012.
- [prieto_extended_1993] M. A. Prieto, J. R. Walsh, R. A. E. Fosbury, and S. di Serego Alighieri. The extended nebulosity in the radio galaxy 3C 227 . MNRAS , 263 pp. 10–24, July 1993.
- [van_der_wolk_dust_2010] G. van der Wolk, P. D. Barthel, R. F. Peletier, and J. W. Pel. Dust tori in radio galaxies . A&A , 511 pp. 64, February 2010.
- [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.