Sasmirala Individual Information for Mrk 1018
Description
Mrk 1018 is a lenticular galaxy at a redshift of z = 0.0424 (D ~ 191 Mpc) with an active nucleus that belongs to the nine-month BAT AGN sample. It was initially optically classified as a Sy 1.9 but intrinsically changed to Sy 1.0 type in 1984 [cohen_variability_1986, trippe_multi-wavelength_2010]. At radio wavelengths, the nucleus appears unresolved at subarcsecond resolution [ulvestad_radio_1986]. The first successful MIR observation of Mrk 1018 was performed with IRTF [rudy_infrared_1985], followed by Spitzer/IRS spectroscopy. The corresponding IRS LR staring-mode spectrum exhibits silicate 10 and 18 μm emission, no significant PAH features and a blue spectral slope in νFν-space. Thus, the arcsecond-scale MIR SED appears to be dominated by an unobscured AGN. The object appears compact in the WISE images. Mrk 1018 was imaged with VISIR in five filters covering the whole N-band in 2009 (unpublished, to our knowledge) and an unresolved nucleus was detected in all cases. The corresponding nuclear photometry agrees with the IRS spectrum, and therefore we use the latter to compute the nuclear 12 μm continuum emission estimate corrected for the silicate feature.
- [cohen_variability_1986] Ross D. Cohen, R. C. Puetter, Richard J. Rudy, T. B. Ake, and Craig B. Foltz. Variability of markarian 1018 - seyfert 1.9 to seyfert 1 . ApJ , 311 pp. 135–141, December 1986.
- [rudy_infrared_1985] R. J. Rudy and J. M. Rodriguez-Espinosa. Infrared photometry of seyfert 1.8 and 1.9 galaxies . ApJ , 298 pp. 614–618, November 1985.
- [trippe_multi-wavelength_2010] M. L. Trippe, D. M. Crenshaw, R. P. Deo, M. Dietrich, S. B. Kraemer, S. E. Rafter, and T. J. Turner. A multi-wavelength study of the nature of type 1.8/1.9 seyfert galaxies . ApJ , 725 pp. 1749–1767, December 2010.
- [ulvestad_radio_1986] James S. Ulvestad. Radio properties of type 1.8 and 1.9 seyfert galaxies . ApJ , 310 pp. 136–144, November 1986.
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.