Sasmirala Individual Information for 3C 445

Description

3C 445 is a FR II radio source identified with the elliptical galaxy LEDA 68751 [madrid_hubble_2006] at a redshift of z = 0.0559 (D ~ 254 Mpc) with a Sy 1.5 nucleus [veron-cetty_catalogue_2010]. It features the typical supergalactic-scale biconical radio lobes with only a partial jet in the direction to the southern lobe (PA~-10^∘; e.g., [leahy_study_1997]). After first being detected in the MIR with IRAS, 3C 445 was followed up with ISO/ISOCAM [siebenmorgen_isocam_2004] and Palomar 5 m/MIRLIN [gorjian_10_2004], where it appeared point-like. 3C 445 was also observed with Spitzer/IRS and MIPS in 2004 and IRAC in 2008. The MIR emission remains nearly unresolved in all Spitzer images, and our nuclear MIPS 24 μm flux agrees with that given in [dicken_origin_2008]. Interestingly, there is a discrepancy between the IRS and MIPS fluxes while IRS and IRAC fluxes agree. The IRS LR staring-mode spectrum shows strong silicate emission and a blue spectral slope in νF_ν-space but no PAH emission (see also [haas_spitzer_2005, shi_9.7_2006, tommasin_spitzer-irs_2010, dicken_spitzer_2012]). VISIR N-band imaging of 3C 445 was performed in 2005 [van_der_wolk_dust_2010] and 2006 [horst_mid_2008, horst_mid-infrared_2009]. T-ReCS Si2 imaging and N-band spectroscopy followed in 2010 [gonzalez-martin_dust_2013]. The nuclear emission of 3C 445 appears possibly marginally resolved in the VISIR and T-ReCS images (FWHM ~ 410 pc) but with inconsistent position angles. Thus, it remains uncertain, whether 3C 445 is indeed resolved at subarcsecond scales in the MIR. Our nuclear photometry is consistent with the values published by [horst_mid_2008] and [van_der_wolk_dust_2010]. The T-ReCS spectrum verifies that the strong silicate emission originates on the projected nuclear scales (< 360 pc) and indicates strong thermal dust emission in 3C 445.

• [dicken_origin_2008] D. Dicken, C. Tadhunter, R. Morganti, C. Buchanan, T. Oosterloo, and D. Axon. The origin of the infrared emission in radio galaxies. i. new mid- to far-infrared and radio observations of the 2 jy sample . ApJ , 678 pp. 712–728, May 2008.
• [dicken_spitzer_2012] D. Dicken, C. Tadhunter, D. Axon, R. Morganti, A. Robinson, M. B. N. Kouwenhoven, H. Spoon, P. Kharb, K. J. Inskip, J. Holt, C. Ramos Almeida, and N. P. H. Nesvadba. Spitzer mid-IR spectroscopy of powerful 2 jy and 3CRR radio galaxies. i. evidence against a strong starburst-AGN connection in radio-loud AGN . ApJ , 745 pp. 172, February 2012.
• [gonzalez-martin_dust_2013] O. González-Martín, J. M. Rodríguez-Espinosa, T. Díaz-Santos, C. Packham, A. Alonso-Herrero, P. Esquej, C. Ramos Almeida, R. Mason, and C. Telesco. Dust in active galactic nuclei. mid-infrared t-ReCS/Gemini spectra using the new RedCan pipeline . A&A , 553 pp. 35, May 2013.
• [gorjian_10_2004] V. Gorjian, M. W. Werner, T. H. Jarrett, D. M. Cole, and M. E. Ressler. 10 micron imaging of seyfert galaxies from the 12 micron sample . ApJ , 605 pp. 156–167, April 2004.
• [haas_spitzer_2005] M. Haas, R. Siebenmorgen, B. Schulz, E. Krügel, and R. Chini. Spitzer IRS spectroscopy of 3CR radio galaxies and quasars: testing the unified schemes . A&A , 442 pp. L39–L43, November 2005.
• [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.
• [leahy_study_1997] J. P. Leahy, A. R. S. Black, J. Dennett-Thorpe, M. J. Hardcastle, S. Komissarov, R. A. Perley, J. M. Riley, and P. A. G. Scheuer. A study of FRII radio galaxies with z<0.15 - II. high-resolution maps of 11 sources at 3.6 CM . MNRAS , 291 pp. 20–53, October 1997.
• [madrid_hubble_2006] Juan P. Madrid, Marco Chiaberge, David Floyd, William B. Sparks, Duccio Macchetto, George K. Miley, David Axon, Alessandro Capetti, Christopher P. O'Dea, Stefi Baum, Eric Perlman, and Alice Quillen. Hubble space telescope near-infrared snapshot survey of 3CR radio source counterparts at low redshift . ApJS , 164 pp. 307–333, June 2006.
• [shi_9.7_2006] Y. Shi, G. H. Rieke, D. C. Hines, V. Gorjian, M. W. Werner, K. Cleary, F. J. Low, P. S. Smith, and J. Bouwman. 9.7 μm silicate features in active galactic nuclei: New insights into unification models . ApJ , 653 pp. 127–136, December 2006.
• [siebenmorgen_isocam_2004] R. Siebenmorgen, W. Freudling, E. Krügel, and M. Haas. ISOCAM survey and dust models of 3CR radio galaxies and quasars . A&A , 421 pp. 129–145, July 2004.
• [tommasin_spitzer-irs_2010] Silvia Tommasin, Luigi Spinoglio, Matthew A. Malkan, and Giovanni Fazio. Spitzer-IRS high-resolution spectroscopy of the 12 μm seyfert galaxies. II. results for the complete data set . ApJ , 709 pp. 1257–1283, February 2010.
• [van_der_wolk_dust_2010] G. van der Wolk, P. D. Barthel, R. F. Peletier, and J. W. Pel. Dust tori in radio galaxies . A&A , 511 pp. 64, February 2010.
• [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

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.