Sasmirala Individual Information for NGC 4593

Description

NGC 4593 is a low-inclination barred spiral galaxy at a redshift of z = 0.009 (D ~ 45.6 Mpc) hosting a Sy 1.0 nucleus [veron-cetty_catalogue_2010] that belongs to the nine-month BAT AGN sample. The AGN is highly variable at all wavelengths shorter than L-band (e.g., [santos-lleo_multifrequency_1994, santos-lleo_multifrequency_1995]) and possess a compact radio core without any evidence for a jet component [ulvestad_radio_1984, kinney_jet_2000]). The NLR is halo-like with a slight elongation of ~ 1.7arcsec ~ 370 pc (PA~ 100^∘; [schmitt_hubble_2003]). The first ground-based N- and Q-band photometry was obtained with UKIRT in 1982 and 1984 [ward_continuum_1987], and IRTF in 1986 [devereux_spatial_1987]. Additional MIR observations with the MMT [maiolino_new_1995], and ISO [clavel_2.5-11_2000, ramos_almeida_mid-infrared_2007] followed. The first subarcsecond-resolution N-band images were taken with Palomar 5 m/MIRLIN in 2000 [gorjian_10_2004]. The Spitzer/IRAC and MIPS images show a dominating compact nuclear source embedded within much weaker spiral-like host emission. Our nuclear IRAC 5.8 and 8.0 μm fluxes are in reasonable agreement with [gallimore_infrared_2010]. The Spitzer/IRS spectrum exhibits weak silicate 10 and 18 μm emission, a moderate PAH 11.3 μm feature and a shallow blue spectral slope in νF_ν-space (see also [shi_9.7_2006, wu_spitzer/irs_2009, tommasin_spitzer-irs_2010, gallimore_infrared_2010]). Therefore, the arcsecond scales appear to be AGN-dominated. We observed the nuclear region of NGC 4593 with VISIR in six N and one Q-band filter in 2005, 2008 and 2010 (partly published in [horst_mid_2008, horst_mid-infrared_2009, honig_dusty_2010-1]). In addition, we obtained a VISIR LR N-band spectrum in 2008. A compact nucleus was detected in all cases without further host emission. It appears marginally resolved in many images including those with the best achieved angular resolution (FWHM ~ 10% larger as standard star). The PA is ~ 110^∘ in these cases, which would roughly match the NLR orientation. Thus, we classify the nucleus as resolved at subarcsecond resolution in the MIR. Our reanalysis of the published VISIR images provides results consistent with the previous works, while the VISIR photometry is on average ~ 22% lower than the Spitzer spectrophotometry. Interestingly, the VISIR spectrum indicates a different spectral shape of the MIR SED at subarcsecond resolution, in particular a stronger silicate 10 μm emission feature might be present. Furthermore, the nuclear photometry indicates possible flux variations on the order of ~ 20% between 2005 and 2010, which is subject of a future a work (Hönig et al., in prep.). The nuclear MIR emission of NGC 4593 has been further resolved with MIDI interferometric observations and was modelled as two equally bright components, one extending for tens of parsecs and one remaining unresolved [burtscher_diversity_2013].

• [burtscher_diversity_2013] L. Burtscher, K. Meisenheimer, K. R. W. Tristram, W. Jaffe, S. F. Hönig, R. I. Davies, M. Kishimoto, J.-U. Pott, H. Röttgering, M. Schartmann, G. Weigelt, and S. Wolf. A diversity of dusty AGN tori. data release for the VLTI/MIDI AGN large program and first results for 23 galaxies . A&A , 558 pp. 149, October 2013.
• [clavel_2.5-11_2000] J. Clavel, B. Schulz, B. Altieri, P. Barr, P. Claes, A. Heras, K. Leech, L. Metcalfe, and A. Salama. 2.5-11 micron spectroscopy and imaging of AGNs. implication for unification schemes . A&A , 357 pp. 839–849, May 2000.
• [devereux_spatial_1987] Nicholas Devereux. The spatial distribution of 10 micron luminosity in spiral galaxies . ApJ , 323 pp. 91–107, December 1987.
• [gallimore_infrared_2010] J. F. Gallimore, A. Yzaguirre, J. Jakoboski, M. J. Stevenosky, D. J. Axon, S. A. Baum, C. L. Buchanan, M. Elitzur, M. Elvis, C. P. O'Dea, and A. Robinson. Infrared spectral energy distributions of seyfert galaxies: Spitzer space telescope observations of the 12 μm sample of active galaxies . ApJS , 187 pp. 172–211, March 2010.
• [gorjian_10_2004] V. Gorjian, M. W. Werner, T. H. Jarrett, D. M. Cole, and M. E. Ressler. 10 micron imaging of seyfert galaxies from the 12 micron sample . ApJ , 605 pp. 156–167, April 2004.
• [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_mid_2008] H. Horst, P. Gandhi, A. Smette, and W. J. Duschl. The mid IR - hard x-ray correlation in AGN and its implications for dusty torus models . A&A , 479 pp. 389–396, February 2008.
• [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.
• [maiolino_new_1995] R. Maiolino, M. Ruiz, G. H. Rieke, and L. D. Keller. New constraints on the unified model of seyfert galaxies . ApJ , 446 pp. 561, June 1995.
• [ramos_almeida_mid-infrared_2007] C. Ramos Almeida, A. M. Pérez García, J. A. Acosta-Pulido, and J. M. Rodríguez Espinosa. The mid-infrared emission of seyfert galaxies: A new analysis of ISOCAM data . AJ , 134 pp. 2006–2019, November 2007.
• [santos-lleo_multifrequency_1994] M. Santos-Lleo, J. Clavel, P. Barr, I. S. Glass, D. Pelat, B. M. Peterson, and G. Reichert. Multifrequency monitoring of the SEYFERT-1 galaxy NGC4593 - part one - isolating the nuclear emission . MNRAS , 270 pp. 580, October 1994.
• [santos-lleo_multifrequency_1995] M. Santos-Lleo, J. Clavel, P. Barr, I. S. Glass, D. Pelat, B. M. Peterson, and G. Reichert. Multifrequency monitoring of the seyfert 1 galaxy NGC 4593 - II. a small, compact nucleus? . MNRAS , 274 pp. 1–19, May 1995.
• [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.
• [tommasin_spitzer-irs_2010] Silvia Tommasin, Luigi Spinoglio, Matthew A. Malkan, and Giovanni Fazio. Spitzer-IRS high-resolution spectroscopy of the 12 μm seyfert galaxies. II. results for the complete data set . ApJ , 709 pp. 1257–1283, February 2010.
• [ulvestad_radio_1984] J. S. Ulvestad and A. S. Wilson. Radio structures of seyfert galaxies. VI - VLA observations of a nearby sample . ApJ , 285 pp. 439–452, October 1984.
• [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.
• [ward_continuum_1987] Martin Ward, Martin Elvis, G. Fabbiano, N. P. Carleton, S. P. Willner, and A. Lawrence. The continuum of type 1 seyfert galaxies. i - a single form modified by the effects of dust . ApJ , 315 pp. 74–91, April 1987.
• [wu_spitzer/irs_2009] Yanling Wu, Vassilis Charmandaris, Jiasheng Huang, Luigi Spinoglio, and Silvia Tommasin. Spitzer/IRS 5-35 μm low-resolution spectroscopy of the 12 μm seyfert sample . ApJ , 701 pp. 658–676, August 2009.

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.