Sasmirala Individual Information for ESO 121-28
Description
ESO 121-28 is a spiral galaxy at a redshift of z = 0.0405 (D ~ 187 Mpc), interacting with a compact galaxy to the south. It was only recently discovered to host a Sy 2 nucleus [donzelli_spectroscopic_2000], which remained unstudied until it was detected in the SWIFT/BAT survey [tueller_swift_2008] and became a member of the nine-month BAT AGN sample. After its first but faint MIR detection with IRAS, ESO 121-28 was also observed with Spitzer/IRS. No IRAC or MIPS images are available, and the object appears compact without any structure in the WISE images. The rather noisy IRS LR staring-mode spectrum has a red spectral slope in νFν-space with prominent silicate 10 μm absorption but no PAH emission (see also [sargsyan_infrared_2011]). We observed ESO 121-28 with VISIR in 2009 in three narrow N-band filters during one night and weakly detected an unresolved nucleus. The VISIR photometry agrees with the IRS spectrum well. Therefore, we use this spectrum to correct our 12 μm continuum flux estimate for the silicate absorption.
- [donzelli_spectroscopic_2000] C. J. Donzelli and M. G. Pastoriza. Spectroscopic observations of merging galaxies . AJ , 120 pp. 189–202, July 2000.
- [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.
- [tueller_swift_2008] J. Tueller, R. F. Mushotzky, S. Barthelmy, J. K. Cannizzo, N. Gehrels, C. B. Markwardt, G. K. Skinner, and L. M. Winter. Swift BAT survey of AGNs . ApJ , 681 pp. 113–127, July 2008.
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.