Warm molecular and ionized gas kinematics in the Type-2 quasar J0945+1737

G. Speranza, C. Ramos Almeida, J. A. Acosta-Pulido, R. A. Riffel, C. Tadhunter, J. C. S. Pierce, A. Rodríguez-Ardila, M. Coloma Puga, M. Brusa, B. Musiimenta, D. M. Alexander, A. Lapi, F. Shankar, C. Villforth

Submitted on 30 June 2022


We analyze Near-Infrared Integral Field Spectrograph (NIFS) observations of the type-2 quasar (QSO2) SDSS J094521.33+173753.2 to investigate its warm molecular and ionized gas kinematics. This QSO2 has a bolometric luminosity of 1045.7 erg s1 and a redshift of z = 0.128. The K-band spectra provided by NIFS cover a range of 1.99-2.40 μm where low-ionization (Paα and Brδ), high ionization ([S XI]λ1.920 μm and [Si~VI]λ1.963 μm) and warm molecular lines (from H2 1-0S(5) to 1-0S(1)) are detected, allowing us to study the multi-phase gas kinematics. Our analysis reveals gas in ordinary rotation in all the emission lines detected and also outflowing gas in the case of the low- and high-ionization emission lines. In the case of the nuclear spectrum, which corresponds to a circular aperture of 0.3\arcsec~(686 pc) in diameter, the warm molecular lines can be characterized using a single Gaussian component of full width at half maximum (FWHM)= 350-400 km s1, while Paα, Brδ, and [Si~VI] are best fitted with two blue-shifted Gaussian components of FWHM800 and 1700 km s1, in addition to a narrow component of 300 km s1. We interpret the blue-shifted broad components as outflowing gas, which reaches the highest velocities, of up to 840 km s1, in the south-east direction (PA125), extending up to a distance of 3.4 kpc from the nucleus. The ionized outflow has a maximum mass outflow rate of {M}˙{out, max}=42-51 M yr1, and its kinetic power represents 0.1% of the quasar bolometric luminosity.


Comment: 24 pages, 20 figures and 5 tables. Accepted for publication in A&A

Subject: Astrophysics - Astrophysics of Galaxies