Sasmirala Individual Information for NGC 3783

Description

NGC 3783 is a barred face-on spiral galaxy at a redshift of z = 0.0097 (D ~ 48.4 Mpc) with a well-studied variable Sy 1.5 nucleus [veron-cetty_catalogue_2010], which also belongs to the nine-month BAT AGN sample. The nucleus is unresolved at radio wavelengths [morganti_radio_1999, kinney_jet_2000], embedded within a halo-like extended NLR with 1.9arcsec(~ 0.4 kpc) size [schmitt_hubble_2003]. The first MIR observations of NGC 3873 were carried out by [kleinmann_10-micron_1974], followed by [rieke_infrared_1978] [frogel_8-13_1982], [glass_mid-infrared_1982], [devereux_spatial_1987], and [roche_atlas_1991]. The first subarcsecond N-band image of NGC 3783 was taken in 2001 with 3.6 m/TIMMI2 [raban_core_2008] where it appeared as point source. The Spitzer/IRAC and MIPS images reveal faint spiral-like host emission apart from the compact nucleus. Note that the IRAC 8 μm PBCD image is saturated in the nucleus and thus not analysed. The Spitzer/IRS LR staring-mode spectrum exhibits silicate 10 μm and possibly silicate 18 μm emission and an emission peak at ~ 20 μm in νF_ν-space but no PAH features (see also [shi_9.7_2006, mullaney_defining_2011]). The nuclear region of NGC 3783 was extensively imaged with VISIR with imaging in six different narrow N-band filters in total and two Q band filters between 2005 and 2011 (part of which published in [horst_small_2006, horst_mid-infrared_2009, haas_visir_2007, honig_dusty_2010-1, reunanen_vlt_2010, kishimoto_mapping_2011]). In addition, a VISIR LR N-band spectrum was obtained [honig_dusty_2010-1]. A compact MIR nucleus without other host emission was detected in all cases. In the sharpest image with the highest S/N taken in the PAH1 filter the nucleus is unresolved, while in the best PAH2_2 image, it is possibly marginally resolved (FWHM ~ 0.34arcsec ~ 80 pc). This is also the case in the Q-band images. Therefore, NGC 3783 might be marginally extended at longer MIR wavelengths, and we classify its extension as in general uncertain at subarcsecond resolution. Our reanalysis of the already published images provides in general consistent value with the previous publications, except for [reunanen_vlt_2010], which have stated a ~ 20% lower PAH2_2 flux value. The multiple measurements in the PAH1 and PAH2_2 filters indicate possible flux variations on the order of 20% over six years, which will be analysed elsewhere (Hönig et al., in prep.). Similarly strong variations also appear in the historical data obtained in the 1970-1980s. In general, the VISIR spectrophotometry is consistent with the Spitzer spectrophotometry, demonstrating that the AGN completely dominates the MIR emission of NGC 3783 also on arcsecond scales (~ 1 kpc). No significant star formation seems to be present in this object. Note that the nucleus of NGC 3783 has also been studied extensively with MIR interferometry using MIDI, in which the nuclear structure is resolved with an polar-elongated size of a few parsec [honig_dust_2013, beckert_probing_2008].

• [beckert_probing_2008] T. Beckert, T. Driebe, S. F. Hönig, and G. Weigelt. Probing the dusty environment of the seyfert 1 nucleus in NGC 3783 with MIDI/VLTI interferometry . A&A , 486 pp. L17–L20, August 2008.
• [devereux_spatial_1987] Nicholas Devereux. The spatial distribution of 10 micron luminosity in spiral galaxies . ApJ , 323 pp. 91–107, December 1987.
• [frogel_8-13_1982] J. F. Frogel, J. H. Elias, and M. M. Phillips. 8-13 micron observations of nine emission-line galaxies . ApJ , 260 pp. 70–74, September 1982.
• [glass_mid-infrared_1982] I. S. Glass, A. F. M. Moorwood, and W. Eichendorf. Mid-infrared observations of seyfert 1 and narrow-line x-ray galaxies . A&A , 107 pp. 276–282, March 1982.
• [haas_visir_2007] M. Haas, R. Siebenmorgen, E. Pantin, H. Horst, A. Smette, H.-U. Käufl, P.-O. Lagage, and R. Chini. VISIR / VLT mid-infrared imaging of seyfert nuclei: nuclear dust emission and the seyfert-2 dichotomy . A&A , 473 pp. 369–376, October 2007.
• [honig_dust_2013] S. F. Hönig, M. Kishimoto, K. R. W. Tristram, M. A. Prieto, P. Gandhi, D. Asmus, R. Antonucci, L. Burtscher, W. J. Duschl, and G. Weigelt. Dust in the polar region as a major contributor to the infrared emission of active galactic nuclei . ApJ , 771 pp. 87, July 2013.
• [honig_dusty_2010-1] S. F. Hönig, M. Kishimoto, P. Gandhi, A. Smette, D. Asmus, W. Duschl, M. Polletta, and G. Weigelt. The dusty heart of nearby active galaxies. i. high-spatial resolution mid-IR spectro-photometry of seyfert galaxies . A&A , 515 pp. 23, June 2010.
• [horst_mid-infrared_2009] H. Horst, W. J. Duschl, P. Gandhi, and A. Smette. Mid-infrared imaging of 25 local AGN with VLT-VISIR . A&A , 495 pp. 137–146, February 2009.
• [horst_small_2006] H. Horst, A. Smette, P. Gandhi, and W. J. Duschl. The small dispersion of the mid IR - hard x-ray correlation in active galactic nuclei . A&A , 457 pp. L17–L20, October 2006.
• [kinney_jet_2000] A. L. Kinney, H. R. Schmitt, C. J. Clarke, J. E. Pringle, J. S. Ulvestad, and R. R. J. Antonucci. Jet directions in seyfert galaxies . ApJ , 537 pp. 152–177, July 2000.
• [kishimoto_mapping_2011] M. Kishimoto, S. F. Hönig, R. Antonucci, F. Millour, K. R. W. Tristram, and G. Weigelt. Mapping the radial structure of AGN tori . A&A , 536 pp. 78, December 2011.
• [kleinmann_10-micron_1974] D. E. Kleinmann and E. L. Wright. 10-MICRON observations of southern-hemisphere galaxies . ApJL , 191 pp. L19, July 1974.
• [morganti_radio_1999] R. Morganti, Z. I. Tsvetanov, J. Gallimore, and M. G. Allen. Radio continuum morphology of southern seyfert galaxies . A&AS , 137 pp. 457–471, June 1999.
• [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.
• [raban_core_2008] D. Raban, B. Heijligers, H. Röttgering, K. Meisenheimer, W. Jaffe, H. U. Käufl, and T. Henning. The core flux of the brightest 10 μm galaxies in the southern sky . A&A , 484 pp. 341–345, June 2008.
• [reunanen_vlt_2010] J. Reunanen, M. A. Prieto, and R. Siebenmorgen. VLT diffraction-limited imaging at 11 and 18μm of the nearest active galactic nuclei . MNRAS , 402 pp. 879–894, February 2010.
• [rieke_infrared_1978] G. H. Rieke. The infrared emission of seyfert galaxies . ApJ , 226 pp. 550–558, December 1978.
• [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.
• [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.
• [shi_9.7_2006] Y. Shi, G. H. Rieke, D. C. Hines, V. Gorjian, M. W. Werner, K. Cleary, F. J. Low, P. S. Smith, and J. Bouwman. 9.7 μm silicate features in active galactic nuclei: New insights into unification models . ApJ , 653 pp. 127–136, December 2006.
• [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

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.