Sasmirala Individual Information for Mrk 897
Description
Mrk 897 is a compact early-type galaxy at a redshift of z = 0.0263 (D ~ 107 Mpc) with an active nucleus classified optically either as Sy 2 [veron-cetty_catalogue_2010] or AGN/starburst composite ([yuan_role_2010]; adopted). The galaxy is interacting with UGC 11680 NED01, which is 1.1arcmimin (~ 32 kpc) towards the west, forming the galaxy pair CPG 552 (UGC 11680). A compact radio core was detected in Mrk 897 (e.g., [thean_high-resolution_2000]). The first MIR detection was reported by [maiolino_new_1995] with MMT N-band photometry, while it remained undetected in the Palomar 5 m/MIRLIN subarcsecond imaging [gorjian_10_2004]. Mrk 897 was also observed with ISO/ISOCAM [domingue_multiwavelength_2003], and Spitzer/IRS and MIPS. It appears compact in the corresponding images. The IRS LR mapping-mode spectrum is very noisy but indicates PAH emission and weak silicate 10 μm absorption, indicating significant star formation (see also [tommasin_spitzer_2008]). The MIR SED peaks at ~ 18 μm in νFν-space. Mrk 897 was observed with T-ReCS in the N filter in 2003 [videla_nuclear_2013], and a compact MIR nucleus embedded within weak diffuse emission is weakly detected. The extended emission is roughly circular with a diameter of ~ 2arcsec ~ 1 kpc. We measure the flux of the unresolved nuclear emission alone, which is consistent with [videla_nuclear_2013] and only 7% of the Spitzer spectrophotometry. These results suggest indeed the existence of an AGN deeply embedded within a bright starburst region dominating the MIR emission of Mrk 897.
- [domingue_multiwavelength_2003] Donovan L. Domingue, Jack W. Sulentic, Cong Xu, Joseph Mazzarella, Yu Gao, and Roberto Rampazzo. Multiwavelength insights into mixed-morphology binary galaxies. i. ISOCAM, ISOPHOT, and hα imaging . AJ , 125 pp. 555–571, February 2003.
- [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.
- [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.
- [thean_high-resolution_2000] Andy Thean, Alan Pedlar, Marek J. Kukula, Stefi A. Baum, and Christopher P. O'Dea. High-resolution radio observations of seyfert galaxies in the extended 12-μm sample - i. the observations . MNRAS , 314 pp. 573–588, May 2000.
- [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.
- [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.
- [videla_nuclear_2013] Liza Videla, Paulina Lira, Heather Andrews, Almudena Alonso-Herrero, David M. Alexander, and Martin Ward. Nuclear infrared spectral energy distribution of type II active galactic nuclei . ApJS , 204 pp. 23, February 2013.
- [yuan_role_2010] T.-T. Yuan, L. J. Kewley, and D. B. Sanders. The role of starburst-active galactic nucleus composites in luminous infrared galaxy mergers: Insights from the new optical classification scheme . ApJ , 709 pp. 884–911, February 2010.
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.
Spitzer MIR images. Displayed are the inner 40 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 0.1% pixels with the highest intensity. The label in the bottom left states instrument and central wavelength of the filter in micron (I: IRAC, M: MIPS).
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.