The MUSE Ultra Deep Field (MUDF). IV. A pair of X-ray weak quasars at the heart of two extended Ly$\alpha$ nebulae - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2023

The MUSE Ultra Deep Field (MUDF). IV. A pair of X-ray weak quasars at the heart of two extended Ly$\alpha$ nebulae

Elisabeta Lusso
  • Fonction : Auteur
Emanuele Nardini
  • Fonction : Auteur
Michele Fumagalli
  • Fonction : Auteur
Matteo Fossati
  • Fonction : Auteur
Fabrizio Arrigoni Battaia
  • Fonction : Auteur
Mitchell Revalski
  • Fonction : Auteur
Marc Rafelski
  • Fonction : Auteur
Valentina d'Odorico
  • Fonction : Auteur
Stefano Cristiani
  • Fonction : Auteur
Pratika Dayal
  • Fonction : Auteur
Francesco Haardt
  • Fonction : Auteur
Emma K Lofthouse
  • Fonction : Auteur

Résumé

We present the results obtained from follow-up observations of the MUSE Ultra Deep Field (MUDF) at X-ray energies with XMM-Newton. The MUDF is centred on a unique field with two bright, physically associated quasars at $z\simeq3.23$, separated by $\sim$500 kpc in projection. Both quasars are embedded within extended Ly$\alpha$ nebulae ($\gtrsim 100~\rm kpc$ at a surface brightness flux level of $\approx 6\times 10^{-19} \rm erg~s^{-1}~cm^{-2}~arcsec^{-2}$), whose elongated morphology is suggestive of an extended filament connecting the quasar haloes. The new X-ray observations presented here allow us to characterise the physical properties (e.g. X-ray slope, luminosities, gas column densities) in the innermost region of the MUDF quasars. We find that both quasars are X-ray underluminous compared to objects at similar ultraviolet luminosities. Based on our X-ray spectral analysis, absorbing columns of $N_H(z)\gtrsim$ 10$^{23}$ cm$^{-2}$ appear unlikely, therefore such a weakness is possibly intrinsic. When also including literature data, we do not observe any detectable trend between the area of the nebulae and nuclear luminosities at both the rest-frame 2 keV and 2500 $\rm \mathring{A}$. The area is also not correlated with the X-ray photon index nor with the integrated band flux in the hard band (2$-$10 keV). We also do not find any trend between the extended Ly$\alpha$ emission of the nebulae and the nuclear X-ray luminosity. Finally, the properties of the MUDF quasars' nebulae are consistent with the observed relation between the Ly$\alpha$ integrated luminosity of the nebulae and their area. Our results suggest that the quasar ionization power is not a strong driver of the morphology and size of the nebulae.
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Dates et versions

hal-04204442 , version 1 (04-01-2024)

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Elisabeta Lusso, Emanuele Nardini, Michele Fumagalli, Matteo Fossati, Fabrizio Arrigoni Battaia, et al.. The MUSE Ultra Deep Field (MUDF). IV. A pair of X-ray weak quasars at the heart of two extended Ly$\alpha$ nebulae. Monthly Notices of the Royal Astronomical Society, 2023, 525 (3), pp.4388-4404. ⟨10.1093/mnras/stad2564⟩. ⟨hal-04204442⟩
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