Sasmirala Individual Information for PG 0052+251
Description
PG 0052+251 is a radio-quiet quasar at a redshift of z = 0.154 (D~ 759 Mpc) with an optical Sy 1.2 classification [veron-cetty_catalogue_2010] in a low-inclination spiral host galaxy [bahcall_apparently_1996]. It was detected at radio wavelengths with a slightly elongated core in the east-west direction, while its [O III] emission is extended in the north-south direction [leipski_radio_2006, bennert_size_2002]. PG 0052+251 was first detected in the MIR by [neugebauer_continuum_1987], and then followed up with ISO [haas_dust_2000] and Spitzer/IRS and MIPS. It appears as a point source in the corresponding MIPS 24 μm image, while the IRS LR staring-mode spectrum exhibits prominent silicate 10 and 18 μm emission, a very weak PAH 11.3 μm feature, and a blue spectral slope in νFν-space (see also [shi_9.7_2006, shi_aromatic_2007]). PG 0052+252 was imaged with COMICS in the N11.7 filter in 2006 (unpublished, to our knowledge), and a compact nucleus without further host emission has been weakly detected. However, the current MIR data are insufficient to reach any robust conclusion about the nuclear extension at subarcsecond scales in the MIR. Our nuclear N11.7 photometry is ~ 29% lower than the Spitzer spectrophotometry, indicating that host emission contributes to the arcsecond-scale MIR SED.
- [bahcall_apparently_1996] John N. Bahcall, Sofia Kirhakos, and Donald P. Schneider. The apparently normal galaxy hosts for two luminous quasars . ApJ , 457 pp. 557, February 1996.
- [bennert_size_2002] Nicola Bennert, Heino Falcke, Hartmut Schulz, Andrew S. Wilson, and Beverley J. Wills. Size and structure of the narrow-line region of quasars . ApJL , 574 pp. L105–L109, August 2002.
- [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_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.
- [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.
- [shi_aromatic_2007] Yong Shi, Patrick Ogle, George H. Rieke, Robert Antonucci, Dean C. Hines, Paul S. Smith, Frank J. Low, Jeroen Bouwman, and Christopher Willmer. Aromatic features in AGNs: star-forming infrared luminosity function of AGN host galaxies . ApJ , 669 pp. 841–861, 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.
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.