Sasmirala Individual Information for PG 0026+129
Description
PG 0026+129 is a radio-quiet quasar at a redshift of z = 0.142 (D~ 691 Mpc) with an optical Sy 1.2 classification [veron-cetty_catalogue_2010]. It was detected at radio wavelengths with a compact core and extended kiloparsec-scale biconical emission in the north-south direction while its [O III] emission is unresolved [leipski_radio_2006]. Pioneering MIR observations were performed by [neugebauer_absolute_1979, neugebauer_continuum_1987], followed by [elvis_atlas_1994] and [neugebauer_variability_1999]. PG 0026+129 was also observed in the MIR with ISO [haas_dust_2000] and Spitzer/IRS and MIPS, and appears as a point source in the corresponding MIPS 24 μm image. The IRS LR staring-mode spectrum exhibits prominent silicate 10 and 18 μm emission and a blue spectral slope in νFν-space, but no PAH features were detected (see also [schweitzer_spitzer_2006, schweitzer_extended_2008]). PG 0026+129 was imaged with COMICS in the N11.7 filter in 2006 (unpublished, to our knowledge), and a compact nucleus without further host emission has been weakly detected. More and deeper subarcsecond MIR imaging is required to investigate the source extension. Our nuclear N11.7 photometry is higher but still consistent with the Spitzer spectrophotometry. Therefore, we use the latter to compute the nuclear 12 μm continuum emission estimate corrected for the silicate feature. Comparison with the historical N-band photometry shows apparent flux variations on the order of ~ 17% during the last ~ 30 years. This indicates intrinsic variability in the N-band emission of PG 0026+129 despite uncertainties and systematics of the different instruments, filters and measurement methods.
- [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_dust_2000] M. Haas, S. A. H. Müller, R. Chini, K. Meisenheimer, U. Klaas, D. Lemke, E. Kreysa, and M. Camenzind. Dust in PG quasars as seen by ISO . A&A , 354 pp. 453–466, February 2000.
- [leipski_radio_2006] C. Leipski, H. Falcke, N. Bennert, and S. Hüttemeister. The radio structure of radio-quiet quasars . A&A , 455 pp. 161–172, August 2006.
- [neugebauer_absolute_1979] G. Neugebauer, J. B. Oke, E. E. Becklin, and K. Matthews. Absolute spectral energy distribution of quasi-stellar objects from 0.3 to 10 microns . ApJ , 230 pp. 79–94, May 1979.
- [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.
- [schweitzer_extended_2008] M. Schweitzer, B. Groves, H. Netzer, D. Lutz, E. Sturm, A. Contursi, R. Genzel, L. J. Tacconi, S. Veilleux, D.-C. Kim, D. Rupke, and A. J. Baker. Extended silicate dust emission in palomar-green QSOs . ApJ , 679 pp. 101–117, May 2008.
- [schweitzer_spitzer_2006] M. Schweitzer, D. Lutz, E. Sturm, A. Contursi, L. J. Tacconi, M. D. Lehnert, K. M. Dasyra, R. Genzel, S. Veilleux, D. Rupke, D.-C. Kim, A. J. Baker, H. Netzer, A. Sternberg, J. Mazzarella, and S. Lord. Spitzer quasar and ULIRG evolution study (QUEST). i. the origin of the far-infrared continuum of QSOs . ApJ , 649 pp. 79–90, September 2006.
- [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.