Q2122-444: A naked active galactic nucleus fully dressed

M. Gliozzi, F. Panessa, F. La Franca, I. Saviane, L. Monaco, L. Foschini, L. Kedziora-Chudczer, S. Satyapal, R. M. Sambruna

Resultado de la investigación: Article

6 Citas (Scopus)

Resumen

Based on previous spectral and temporal optical studies, Q2122-444 has been classified as a naked active galactic nucleus (AGN) or true type 2 AGN, that is, an AGN that genuinely lacks a broad-line region (BLR). Its optical spectrum seemed to possess only narrow forbidden emission lines that are typical of type 2 (obscured) AGNs, but the long-term optical light curve, obtained from a monitoring campaign over more than two decades, showed strong variability, apparently ruling out the presence of heavy obscuration. Here we present the results from a ~40 ks XMM-Newton observation of Q2122-444 carried out to shed light on the energetics of this enigmatic AGN. The X-ray analysis was complemented with Australia Telescope Compact Array radio data to assess the possible presence of a jet, and with new NTT/EFOSC2 optical spectroscopic data to verify the actual absence of a BLR. The higher-quality optical data revealed the presence of strong and broad Balmer lines that are at odds with the previous spectral classification of this AGN. The lack of detection of radio emission rules out the presence of a jet. The X-ray data combined with simultaneous UV observations carried out by the Optical Monitor (OM) aboard XMM-Newton confirm that Q2122-444 is a typical type 1 AGN without any significant intrinsic absorption. New estimates of the black hole mass independently obtained from the broad Balmer lines and from a new scaling technique based on X-ray spectral data suggest that Q2122-444 is accreting at a relatively high rate in Eddington units.

Idioma originalEnglish
Páginas (desde-hasta)2071-2077
Número de páginas7
PublicaciónAstrophysical Journal
Volumen725
N.º2
DOI
EstadoPublished - 20 dic 2010

Huella dactilar

active galactic nuclei
XMM-Newton telescope
newton
radio
x rays
X-ray spectroscopy
occultation
radio emission
energetics
light curve
monitors
optical spectrum
telescopes
scaling
monitoring
estimates

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Gliozzi, M., Panessa, F., La Franca, F., Saviane, I., Monaco, L., Foschini, L., ... Sambruna, R. M. (2010). Q2122-444: A naked active galactic nucleus fully dressed. Astrophysical Journal, 725(2), 2071-2077. https://doi.org/10.1088/0004-637X/725/2/2071
Gliozzi, M. ; Panessa, F. ; La Franca, F. ; Saviane, I. ; Monaco, L. ; Foschini, L. ; Kedziora-Chudczer, L. ; Satyapal, S. ; Sambruna, R. M. / Q2122-444 : A naked active galactic nucleus fully dressed. En: Astrophysical Journal. 2010 ; Vol. 725, N.º 2. pp. 2071-2077.
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abstract = "Based on previous spectral and temporal optical studies, Q2122-444 has been classified as a naked active galactic nucleus (AGN) or true type 2 AGN, that is, an AGN that genuinely lacks a broad-line region (BLR). Its optical spectrum seemed to possess only narrow forbidden emission lines that are typical of type 2 (obscured) AGNs, but the long-term optical light curve, obtained from a monitoring campaign over more than two decades, showed strong variability, apparently ruling out the presence of heavy obscuration. Here we present the results from a ~40 ks XMM-Newton observation of Q2122-444 carried out to shed light on the energetics of this enigmatic AGN. The X-ray analysis was complemented with Australia Telescope Compact Array radio data to assess the possible presence of a jet, and with new NTT/EFOSC2 optical spectroscopic data to verify the actual absence of a BLR. The higher-quality optical data revealed the presence of strong and broad Balmer lines that are at odds with the previous spectral classification of this AGN. The lack of detection of radio emission rules out the presence of a jet. The X-ray data combined with simultaneous UV observations carried out by the Optical Monitor (OM) aboard XMM-Newton confirm that Q2122-444 is a typical type 1 AGN without any significant intrinsic absorption. New estimates of the black hole mass independently obtained from the broad Balmer lines and from a new scaling technique based on X-ray spectral data suggest that Q2122-444 is accreting at a relatively high rate in Eddington units.",
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Gliozzi, M, Panessa, F, La Franca, F, Saviane, I, Monaco, L, Foschini, L, Kedziora-Chudczer, L, Satyapal, S & Sambruna, RM 2010, 'Q2122-444: A naked active galactic nucleus fully dressed', Astrophysical Journal, vol. 725, n.º 2, pp. 2071-2077. https://doi.org/10.1088/0004-637X/725/2/2071

Q2122-444 : A naked active galactic nucleus fully dressed. / Gliozzi, M.; Panessa, F.; La Franca, F.; Saviane, I.; Monaco, L.; Foschini, L.; Kedziora-Chudczer, L.; Satyapal, S.; Sambruna, R. M.

En: Astrophysical Journal, Vol. 725, N.º 2, 20.12.2010, p. 2071-2077.

Resultado de la investigación: Article

TY - JOUR

T1 - Q2122-444

T2 - A naked active galactic nucleus fully dressed

AU - Gliozzi, M.

AU - Panessa, F.

AU - La Franca, F.

AU - Saviane, I.

AU - Monaco, L.

AU - Foschini, L.

AU - Kedziora-Chudczer, L.

AU - Satyapal, S.

AU - Sambruna, R. M.

PY - 2010/12/20

Y1 - 2010/12/20

N2 - Based on previous spectral and temporal optical studies, Q2122-444 has been classified as a naked active galactic nucleus (AGN) or true type 2 AGN, that is, an AGN that genuinely lacks a broad-line region (BLR). Its optical spectrum seemed to possess only narrow forbidden emission lines that are typical of type 2 (obscured) AGNs, but the long-term optical light curve, obtained from a monitoring campaign over more than two decades, showed strong variability, apparently ruling out the presence of heavy obscuration. Here we present the results from a ~40 ks XMM-Newton observation of Q2122-444 carried out to shed light on the energetics of this enigmatic AGN. The X-ray analysis was complemented with Australia Telescope Compact Array radio data to assess the possible presence of a jet, and with new NTT/EFOSC2 optical spectroscopic data to verify the actual absence of a BLR. The higher-quality optical data revealed the presence of strong and broad Balmer lines that are at odds with the previous spectral classification of this AGN. The lack of detection of radio emission rules out the presence of a jet. The X-ray data combined with simultaneous UV observations carried out by the Optical Monitor (OM) aboard XMM-Newton confirm that Q2122-444 is a typical type 1 AGN without any significant intrinsic absorption. New estimates of the black hole mass independently obtained from the broad Balmer lines and from a new scaling technique based on X-ray spectral data suggest that Q2122-444 is accreting at a relatively high rate in Eddington units.

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KW - Galaxies: active

KW - Galaxies: nuclei

KW - X-rays: galaxies

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Gliozzi M, Panessa F, La Franca F, Saviane I, Monaco L, Foschini L y otros. Q2122-444: A naked active galactic nucleus fully dressed. Astrophysical Journal. 2010 dic 20;725(2):2071-2077. https://doi.org/10.1088/0004-637X/725/2/2071