Sasmirala Individual Information for NGC 7590

Description

NGC 7590 is a highly-inclined late-type spiral galaxy at a distance of D = 26.5 ± 4.8 Mpc hosting a Sy 2 nucleus and circum-nuclear star formation [shi_unobscured_2010]. [tran_unified_2003] reclassified the nucleus as non-AGN, while we treat this object as an uncertain AGN/starburst composite. In fact, the X-ray morphology is complex and the nature of the nuclear source is uncertain [shu_xmm-newton_2010]. Furthermore, the nucleus has not been detected with arcsecond-resolution radio observations so far [morganti_radio_1999]. After its first MIR detection, NGC 7590 was followed up in the MIR with Spitzer/IRAC, IRS and MIPS observations. The corresponding IRAC images show an extended nucleus, elongated along the host major axis, and embedded within comparably bright spiral-like host emission, which dominates towards longer wavelengths. The nucleus is not visible in the MIPS 24 μm image, and we determine an upper limit on the nuclear flux (see also [shi_unobscured_2010]). Our nuclear IRAC 5.8 and 8.0 μm photometry is significantly lower than the values published in [gallimore_infrared_2010]. The IRS LR mapping-mode spectrum suffers from low S/N but exhibits strong PAH emission features and a red spectral slope in νF_ν-space (see also [tommasin_spitzer_2008, tommasin_spitzer-irs_2010, wu_spitzer/irs_2009, gallimore_infrared_2010]). It is significantly contaminated or even dominated by emission from the circum-nuclear starburst ring in the slit and should be regarded as an upper limit to the arcsecond-sale MIR SED. No AGN-indicative [Ne V] emission was detected in the IRS spectrum. The nuclear region of NGC 7590 was observed with T-ReCS in the broad N filter in 2005 (unpublished, to our knowledge), and with VISIR in two narrow N-band filters in 2009 [asmus_mid-infrared_2011]. No emission structures are detected in the images, and our corresponding flux upper limits are comparable to the Spitzer spectrophotometry. We conclude that there is no MIR evidence for an AGN in NGC 7590. However, the flux upper limits are consistent with the MIR–X-ray correlation even for the Compton-thick AGN scenario proposed by [shu_xmm-newton_2010] (2010; [asmus_mid-infrared_2011]).

• [asmus_mid-infrared_2011] D. Asmus, P. Gandhi, A. Smette, S. F. Hönig, and W. J. Duschl. Mid-infrared properties of nearby low-luminosity AGN at high angular resolution . A&A , 536 pp. 36, December 2011.
• [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.
• [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.
• [shi_unobscured_2010] Yong Shi, George H. Rieke, Paul Smith, Jane Rigby, Dean Hines, Jennifer Donley, Gary Schmidt, and Aleksandar M. Diamond-Stanic. Unobscured type 2 active galactic nuclei . ApJ , 714 pp. 115–129, May 2010.
• [shu_xmm-newton_2010] X. W. Shu, T. Liu, and J. X. Wang. XMM-Newton observations of the seyfert 2 galaxy NGC 7590: The nature of x-ray absorption . ApJ , 722 pp. 96–101, October 2010.
• [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.
• [tommasin_spitzer_2008] Silvia Tommasin, Luigi Spinoglio, Matthew A. Malkan, Howard Smith, Eduardo González-Alfonso, and Vassilis Charmandaris. Spitzer IRS high-resolution spectroscopy of the 12 μm seyfert galaxies. i. first results . ApJ , 676 pp. 836–856, April 2008.
• [tran_unified_2003] Hien D. Tran. The unified model and evolution of active galaxies: Implications from a spectropolarimetric study . ApJ , 583 pp. 632–648, February 2003.
• [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.