Sasmirala Individual Information for Mrk 841
Description
Mrk 841 is an early-type galaxy at a redshift of z = 0.0364 (D ~ 157 Mpc) with a radio-quiet quasar-regime AGN optically classified as a Sy 1.5 [veron-cetty_catalogue_2010]. It has mainly been studies at X-rays and also belongs to the nine-month BAT AGN sample. Apart from IRAS, Mrk 841 was observed at MIR wavelengths by [neugebauer_continuum_1987], [ward_continuum_1987], [elvis_atlas_1994], [maiolino_new_1995] and [neugebauer_variability_1999] with photometers, while ISO imaging is reported in [haas_iso_2003] and [ramos_almeida_mid-infrared_2007]. The N-band photometry indicates a flux decrease by ~ 17% from 1981 to 1996 (see also [neugebauer_variability_1999]). A decreasing trend is also found in the IRAS 12 μm flux monitoring during 1983 reported in [edelson_far-infrared_1987]. Mrk 841 was also observed with Spitzer/IRAC, IRS and MIPS, and appears very compact in the corresponding images. The IRS LR staring-mode spectrum exhibits very weak silicate 10 and 18 μm emission, almost no PAH emission, and an emission peak at ~ 18 μm in νFν-space, i.e., the MIR SED seems totally AGN dominated. We observed Mrk 841 with VISIR in three narrow N-band filter in 2010 and detected a compact MIR nucleus without any host emission (see also [dudik_mid-infrared_2007, cao_mid-infrared_2008]). The nucleus appears possibly marginally resolved in all images (FWHM~ 0.36arcsec ~ 250 pc) but at least a second epoch of subarcsecond MIR imaging is required to confirm this finding. The nuclear photometry marginally agrees with the Spitzer spectrophotometry and the previous N-band photometry obtained in the 1990s. Note however, that the nuclear fluxes would be significantly lower if the presence of subarcsecond-extended emission can be verified.
- [cao_mid-infrared_2008] Chen Cao, X. Y. Xia, Hong Wu, S. Mao, C. N. Hao, and Z. G. Deng. Mid-infrared spectroscopic properties of ultra-luminous infrared quasars . MNRAS , 390 pp. 336–348, October 2008.
- [dudik_mid-infrared_2007] R. P. Dudik, J. C. Weingartner, S. Satyapal, Jacqueline Fischer, C. C. Dudley, and B. O'Halloran. Mid-infrared fine-structure line ratios in active galactic nuclei observed with the spitzer IRS: evidence for extinction by the torus . ApJ , 664 pp. 71–87, July 2007.
- [edelson_far-infrared_1987] R. A. Edelson and M. A. Malkan. Far-infrared variability in active galactic nuclei . ApJ , 323 pp. 516–535, December 1987.
- [elvis_atlas_1994] Martin Elvis, Belinda J. Wilkes, Jonathan C. McDowell, Richard F. Green, Jill Bechtold, S. P. Willner, M. S. Oey, Elisha Polomski, and Roc Cutri. Atlas of quasar energy distributions . ApJS , 95 pp. 1–68, November 1994.
- [haas_iso_2003] M. Haas, U. Klaas, S. A. H. Müller, F. Bertoldi, M. Camenzind, R. Chini, O. Krause, D. Lemke, K. Meisenheimer, P. J. Richards, and B. J. Wilkes. The ISO view of palomar-green quasars . A&A , 402 pp. 87–111, April 2003.
- [maiolino_new_1995] R. Maiolino, M. Ruiz, G. H. Rieke, and L. D. Keller. New constraints on the unified model of seyfert galaxies . ApJ , 446 pp. 561, June 1995.
- [neugebauer_continuum_1987] G. Neugebauer, R. F. Green, K. Matthews, M. Schmidt, B. T. Soifer, and J. Bennett. Continuum energy distributions of quasars in the palomar-green survey . ApJS , 63 pp. 615–644, March 1987.
- [neugebauer_variability_1999] G. Neugebauer and K. Matthews. Variability of quasars at 10 microns . AJ , 118 pp. 35–45, July 1999.
- [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.
- [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.
- [ward_continuum_1987] Martin Ward, Martin Elvis, G. Fabbiano, N. P. Carleton, S. P. Willner, and A. Lawrence. The continuum of type 1 seyfert galaxies. i - a single form modified by the effects of dust . ApJ , 315 pp. 74–91, April 1987.
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.