Sasmirala Individual Information for Mrk 915
Description
Mrk 915 is an inclined spiral galaxy at a redshift of z = 0.0241 (D ~ 96.1 Mpc) with an AGN either classified as a Sy 1.5 [bennert_size_2006], Sy 1.8 or Sy 1.9 [trippe_multi-wavelength_2010]. We treat it as Sy 1.9 following the argumentation of [trippe_multi-wavelength_2010]. It possesses an extended NLR (diameter~ 4arcsec ~ 1.8 kpc; PA~ 5∘; [schmitt_hubble_2003]), and appears essentially unresolved at radio wavelengths with only a weak emission blob to the south-west [schmitt_jet_2001]. Apart from IRAS, Mrk 915 was observed with Spitzer/IRS and the LR staring-mode spectrum shows strong forbidden emission lines, weak silicate 10 and 18 μm emission, a weak PAH 11.3 μm feature and an emission peak at ~ 18 μm in νFν-space (see also [sargsyan_infrared_2011]). The MIR SED thus appears to be AGN-dominated. Mrk 915 was observed with T-ReCS in the Qa filter in 2007 (unpublished, to our knowledge), and a compact nucleus was detected in the image. The nucleus is possibly marginally extended but without at least a second epoch of MIR imaging the MIR subarcsecond morphology remains uncertain. The measured nuclear Qa flux is consistent with the IRS spectrum and therefore, we use the latter to compute the 12 μm continuum emission estimate for the nucleus of Mrk 915.
- [bennert_size_2006] N. Bennert, B. Jungwiert, S. Komossa, M. Haas, and R. Chini. Size and properties of the NLR in the seyfert-2 galaxy NGC 1386 . A&A , 446 pp. 919–932, February 2006.
- [sargsyan_infrared_2011] Lusine Sargsyan, Daniel Weedman, Vianney Lebouteiller, James Houck, Donald Barry, Ashot Hovhannisyan, and Areg Mickaelian. Infrared spectra and spectral energy distributions for dusty starbursts and active galactic nuclei . ApJ , 730 pp. 19, March 2011.
- [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.
- [schmitt_jet_2001] H. R. Schmitt, J. S. Ulvestad, R. R. J. Antonucci, and A. L. Kinney. Jet directions in seyfert galaxies: Radio continuum imaging data . ApJS , 132 pp. 199–209, February 2001.
- [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.
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.