Sasmirala Individual Information for NGC 3094
Description
NGC 3094 is a low-inclination barred spiral galaxy at a redshift of z = 0.008 (D ~ 40.8 Mpc) with an obscured AGN [armus_long-slit_1989, imanishi_3.4-m_2000]. Not much is known about this AGN, there are not X-ray measurements available, and only a low-resolution radio map showing extended emission [condon_1.49_1990]. We conservatively treat this object as uncertain type II AGN. After the discovery of its MIR brightness through IRAS, NGC 3094 was observed spectroscopically by [roche_atlas_1991] who found a deep silicate feature dominating the whole N-band. No Spitzer data are available for this object but [roche_silicate_2007] obtained a T-ReCS LR N-band spectrum verifying the deep silicate 10 μm absorption feature. In an acquisition image, the nucleus appear extended along the north-south direction with ~ 1arcsec diameter. Here, we report three additional T-ReCS images in the broad N filter obtained between 2008 and 2009 (unpublished, to our knowledge). Again, the nucleus appears elongated north-south but the difference to the corresponding standard stars is not significant. Note that in the four WISE bands, NGC 3094 is also slightly elongated in the same direction. Our nuclear photometry is consistent with the T-ReCS spectrum reanalysed by [gonzalez-martin_dust_2013] and therefore we use the latter to correct our 12 μm continuum emission estimate for the silicate absorption.
- [armus_long-slit_1989] Lee Armus, Timothy M. Heckman, and George K. Miley. Long-slit optical spectroscopy of powerful far-infrared galaxies - the nature of the nuclear energy source . ApJ , 347 pp. 727–742, December 1989.
- [condon_1.49_1990] J. J. Condon, G. Helou, D. B. Sanders, and B. T. Soifer. A 1.49 GHz atlas of the IRAS bright galaxy sample . ApJS , 73 pp. 359–400, July 1990.
- [gonzalez-martin_dust_2013] O. González-Martín, J. M. Rodríguez-Espinosa, T. Díaz-Santos, C. Packham, A. Alonso-Herrero, P. Esquej, C. Ramos Almeida, R. Mason, and C. Telesco. Dust in active galactic nuclei. mid-infrared t-ReCS/Gemini spectra using the new RedCan pipeline . A&A , 553 pp. 35, May 2013.
- [imanishi_3.4-m_2000] M. Imanishi. The 3.4-μm absorption feature towards three obscured active galactic nuclei . MNRAS , 319 pp. 331–336, November 2000.
- [roche_atlas_1991] Patrick F. Roche, David K. Aitken, Craig H. Smith, and Martin J. Ward. An atlas of mid-infrared spectra of galaxy nuclei . MNRAS , 248 pp. 606–629, February 1991.
- [roche_silicate_2007] Patrick F. Roche, Christopher Packham, David K. Aitken, and Rachel E. Mason. Silicate absorption in heavily obscured galaxy nuclei . MNRAS , 375 pp. 99–104, February 2007.
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.