Sasmirala Individual Information for H 0557-385
Description
H 0557-385 is a Sy 1.2 object [veron-cetty_catalogue_2010] in the highly-inclined early-type galaxy LEDA 75476 at a redshift of z = 0.0339 (D ~ 144 Mpc) that belongs to the nine-month BAT AGN sample. This object was observed with Spitzer/IRAC, IRS and MIPS where it appears as a nearly unresolved nuclear MIR source without any extended host emission. The PBCD IRAC 8.0 μm image is partly saturated and is not used. Our IRAC 5.8 photometry matches the values published in [kishimoto_mapping_2011]. The IRS LR staring-mode spectrum shows silicate 10 μm absorption, which is unusual for a type I AGN but matches the partial obscuration scenario proposed by [longinotti_obscuring_2009] for H 0557-385. The spectral slope is blue in νFν-space (see also [mullaney_defining_2011]). H 0557-385 was observed with VISIR in 2009 by us in three narrow N-band filters and by [kishimoto_mapping_2011] in another two. A compact nuclear MIR source was detected in all images, which appears marginally resolved in the SIV filter image (FWHM ~ 0.46arcsec ~ 300 pc) but not in the PAH1 and NEII images. Therefore, it remains uncertain, whether the MIR nucleus of H 0557-385 is resolved at subarcsecond resolution. Our photometry is consistent with the values of [kishimoto_mapping_2011] and the Spitzer spectrophotometry. Note that [kishimoto_mapping_2011] marginally resolve the nuclear MIR emission of H 0557-385 with MIDI interferometric observations (see also [burtscher_diversity_2013]).
- [burtscher_diversity_2013] L. Burtscher, K. Meisenheimer, K. R. W. Tristram, W. Jaffe, S. F. Hönig, R. I. Davies, M. Kishimoto, J.-U. Pott, H. Röttgering, M. Schartmann, G. Weigelt, and S. Wolf. A diversity of dusty AGN tori. data release for the VLTI/MIDI AGN large program and first results for 23 galaxies . A&A , 558 pp. 149, October 2013.
- [kishimoto_mapping_2011] M. Kishimoto, S. F. Hönig, R. Antonucci, F. Millour, K. R. W. Tristram, and G. Weigelt. Mapping the radial structure of AGN tori . A&A , 536 pp. 78, December 2011.
- [longinotti_obscuring_2009] A. L. Longinotti, S. Bianchi, L. Ballo, I. de La Calle, and M. Guainazzi. Obscuring clouds playing hide-and-seek in the active nucleus h0557-385 . MNRAS , 394 pp. L1–L5, March 2009.
- [mullaney_defining_2011] J. R. Mullaney, D. M. Alexander, A. D. Goulding, and R. C. Hickox. Defining the intrinsic AGN infrared spectral energy distribution and measuring its contribution to the infrared output of composite galaxies . MNRAS , page 474, April 2011.
- [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.