Sasmirala Individual Information for ESO 141-55
Description
ESO 141-55 is a rather face-on spiral galaxy at a redshift of z = 0.0371 (D ~ 156 Mpc) with a Sy 1.2 nucleus [veron-cetty_catalogue_2010]. The first photometric N-band measurements of ESO 141-55 were performed by [glass_mid-infrared_1982] with the ESO infrared photometer system at the 3 m telescope. Later, it was observed with ISO/ISOCAM and Spitzer/IRAC and IRS. The ISOCAM total fluxes published by [ramos_almeida_mid-infrared_2007] agree with the Spitzer data well. The IRAC 5.8 and 8.0 μm images show a nearly unresolved nucleus, and the spiral arms are only weakly detected in the 8.0 μm image. The IRS LR staring mode spectrum shows strong silicate 10 and 18 μm emission and weak PAH features (see [tommasin_spitzer_2008] for an IRS HR spectrum). The MIR slope is blue in νFν-space. We observed ESO 141-55 with VISIR in 2006 (one epoch) in three narrow N-band filters and detected a compact MIR nucleus without any sign of significant extended or non-nuclear emission (see also [horst_mid-infrared_2009]). However, the PSF comparison indicates that the nucleus is possibly marginally resolved (FWHM ~ 0.42arcsec ~ 300 pc). Our new measurement of the nuclear fluxes is consistent with the previously published values [horst_mid_2008]. The subarcsecond fluxes are on average ~ 24% lower than the flux levels of the Spitzer spectrophotometry and would be even lower if the presence of subarcsecond-extended emission can be verified. Thus, no silicate correction is attempted in our 12 μm continuum flux estimate.
- [glass_mid-infrared_1982] I. S. Glass, A. F. M. Moorwood, and W. Eichendorf. Mid-infrared observations of seyfert 1 and narrow-line x-ray galaxies . A&A , 107 pp. 276–282, March 1982.
- [horst_mid-infrared_2009] H. Horst, W. J. Duschl, P. Gandhi, and A. Smette. Mid-infrared imaging of 25 local AGN with VLT-VISIR . A&A , 495 pp. 137–146, February 2009.
- [horst_mid_2008] H. Horst, P. Gandhi, A. Smette, and W. J. Duschl. The mid IR - hard x-ray correlation in AGN and its implications for dusty torus models . A&A , 479 pp. 389–396, February 2008.
- [ramos_almeida_mid-infrared_2007] C. Ramos Almeida, A. M. Pérez García, J. A. Acosta-Pulido, and J. M. Rodríguez Espinosa. The mid-infrared emission of seyfert galaxies: A new analysis of ISOCAM data . AJ , 134 pp. 2006–2019, November 2007.
- [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.
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.