Sasmirala Individual Information for 3C 327

Description

3C 327 is a FR II radio source identified with the flattened elliptical galaxy LEDA 56797 at a redshift of z = 0.1048 (D ~ 505 Mpc) with a Sy 1 nucleus [veron-cetty_catalogue_2010]. 3C 327 features supergalactic-scale double radio lobes in the east-west directions without prominent jets (PA~ 100; e.g., [baum_extended_1988, leahy_study_1997]). 3C 327 was first detected in the MIR with IRAS, and was followed up with Spitzer/IRS and MIPS observations. A point-like nucleus was detected in the MIPS 24 μm image. Our corresponding nuclear MIPS 24 μm flux agrees with the literature values by [shi_far-infrared_2005] and [dicken_origin_2008]. The IRS LR staring-mode spectrum possibly shows weak silicate 10 μm absorption, strong forbidden high ionization lines and a red spectral slope in νFν-space but no PAH emission (see also [dicken_spitzer_2012]). Silicate absorption would be atypical for a type I AGN. 3C 327 was imaged with VISIR in the broad SIC filter in 2005, and a compact nucleus was weakly detected [van_der_wolk_dust_2010]. It appears extended in the image (FWHM ~ 1.2 kpc) but a second epoch of deep subarcsecond MIR imaging is required to verify this extension. [van_der_wolk_dust_2010] conclude that the observed MIR emission must be dominated by thermal dust emission because of the high excess above the predicted synchrotron emission from extrapolating the radio wavelengths. Our nuclear SIC flux is 20% lower than theirs but matches the Spitzer spectrophotometry.

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.

Photometry details and reduced FITS files

ObjectRA
[deg]
Dec
[deg]
FilterImageInfoλ_c
[um]
HWHM
[um]
InstrPix. size
[arcsec/pix]
T_exp
[s]
ModeChop Throw
[arcsec]
Chop Angle
[deg]
Rot
[deg]
Prog IdCal. StarCal. DateDate Obs.Factor
[mJy/ct]
Err. Factor
[mJy/ct]
Cal. Flux
[mJy]
Upper Lim. Gauss?F_Gauss
[mJy]
E(F_Gauss)
[mJy]
Upper Lim. PSF?F_PSF
[mJy]
E(F_PSF)
[mJy]
Cal. Maj.
[arcsec]
Cal. Min.
[arcsec]
Cal. PA.
[deg]
Maj. Ax
[arcsec]
Min. Ax
[arcsec]
Pos. Ang.
[deg]
3C 327240.6141671.965556SIC3C327_SIC_2005-07-02T01-45.fits[Details]11.852.34VISIR0.0751794.0PARA8.00.00.0075.B-0621(A)HD1331652005-07-02T02:24:00Z2005-07-02T01:45:07Z0.05750.002215332.7False58.47.6False40.31.80.560.47120.00.660.6197.0