Sasmirala Individual Information for NGC 7212
Description
NGC 7212 is a system of three interacting galaxies with one containing an AGN [wasilewski_new_1981]. In the following we refer to the largest, central galaxy, NGC 7212 NED02 as NGC 7172. This galaxy is an inclined spiral at a redshift of z = 0.0266 (D ~ 116 Mpc) containing a Sy 2 nucleus [de_robertis_analysis_1986] with broad emission lines in polarized light [tran_nature_1995]. A double radio source along PA~ 170∘ with ~ 1arcsec ~ 0.5 kpc length was detected in its nucleus [falcke_hst_1998] with an aligned extended kiloparsec-scale NLR ,(e.g. [schmitt_hubble_2003, cracco_origin_2011]). After being detected in the MIR with IRAS for the first time, NGC 7212 was followed up with Spitzer/IRS and was also imaged with WISE. All three galaxies are detected in the corresponding WISE images but no substructure is visible. The IRS LR staring-mode spectrum exhibits weak silicate 10 μm absorption, weak PAH features, prominent forbidden emission lines, and a continuum emission peak at ~ 18 μm (see also [sargsyan_infrared_2011]). Thus, the arcsecond-scale MIR SED appears to be AGN dominated. The nuclear region of NGC 7212 was observed with T-ReCS in the Qa filter in 2007 (unpublished, to our knowledge). In the image, an elongated nucleus without further host emission was detected (FWHM(major axis)~ 0.79arcsec ~ 0.4 kpc; PA~ 177∘). At least a second epoch of subarcsecond MIR imaging is required to verify this extension. However, it is parallel to the ionization cone direction and indicates dust in the ionization cone as suggested by [cracco_origin_2011]. The nuclear Qa flux is consistent with the IRS spectrum, and, thus, we use the latter to calculate the 12 μm continuum emission estimate. Note, however, that the nuclear flux would be significantly lower if the subarcsecond-extended emission can be verified. For now, the resulting synthetic flux is scaled by half of the ratio between FνPSF and FνGau to account for the possibly nuclear extension.
- [cracco_origin_2011] V. Cracco, S. Ciroi, F. di Mille, L. Vaona, A. Frassati, A. A. Smirnova, G. La Mura, A. V. Moiseev, and P. Rafanelli. The origin of gas in extended narrow-line regions of nearby seyfert galaxies - i. NGC 7212 . MNRAS , 418 pp. 2630–2641, December 2011.
- [de_robertis_analysis_1986] M. M. De Robertis and D. E. Osterbrock. An analysis of the narrow line profiles in seyfert 2 galaxies . ApJ , 301 pp. 727–741, February 1986.
- [falcke_hst_1998] Heino Falcke, Andrew S. Wilson, and Chris Simpson. HST and VLA observations of seyfert 2 galaxies: The relationship between radio ejecta and the narrow-line region . ApJ , 502 pp. 199, July 1998.
- [sargsyan_infrared_2011] Lusine Sargsyan, Daniel Weedman, Vianney Lebouteiller, James Houck, Donald Barry, Ashot Hovhannisyan, and Areg Mickaelian. Infrared spectra and spectral energy distributions for dusty starbursts and active galactic nuclei . ApJ , 730 pp. 19, March 2011.
- [schmitt_hubble_2003] H. R. Schmitt, J. L. Donley, R. R. J. Antonucci, J. B. Hutchings, and A. L. Kinney. A hubble space telescope survey of extended [o III] λ5007 emission in a far-infrared selected sample of seyfert galaxies: Observations . ApJS , 148 pp. 327–352, October 2003.
- [tran_nature_1995] Hien D. Tran. The nature of seyfert 2 galaxies with obscured broad-line regions. II. individual objects . ApJ , 440 pp. 578, February 1995.
- [wasilewski_new_1981] A. J. Wasilewski. A new seyfert galaxy with asymmetric forbidden-line profiles in an interacting system . PASP , 93 pp. 560–563, October 1981.
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.