A multiwavelength study of a massive, active galaxy at z similar to 2: coupling the kinematics of the ionized and molecular gasLoiacono, F., Talia, M., Fratemali, F., Cimatti, A., Di Teodoro, E. M. & Caminha, G. B., Oct-2019, In : Monthly Notices of the Royal Astronomical Society. 489, 1, p. 681-698 18 p.
Research output: Contribution to journal › Article › Academic › peer-review
We report a multiwavelength study of the massive ( M-* greater than or similar to 10(11)M(circle dot)), z similar to 2 star-forming galaxy GMASS 0953, which hosts an obscured AGN. We combined near-infrared observations of the GNIRS, SINFONI and KMOS spectrographs to study the kinematics of the [O III] lambda 5007 and H alpha emission lines. Our analysis shows that GMASS 0953 may host an ionized disc extending up to 13 kpc, which rotates at a velocity of V-ion = 203(-20)(+17) km s(-1) at the outermost radius. Evidence of rotation on a smaller scale (R similar to 1 kpc) arises from the CO(J = 6-5) line. The central velocity V-CO = 320(-53)(+92) km s(-1) traced by the molecular gas is higher than V-ion, suggesting that the galaxy harbours a multiphase disc with a rotation curve that peaks in the very central regions. The galaxy appears well located on the z = 0 baryonic Tully-Fisher relation. We also discuss the possibility that the [O III] lambda 5007 and H alpha velocity gradients are due to a galactic-scale wind. Besides, we found evidence of an AGN-driven outflow traced by a broad blueshifted wing affecting the [O III] lambda 5007 line, which presents a velocity offset Delta v = -535 +/- 152 km s(-1) from the systemic velocity. Because of the short depletion time-scale (tau(dep) similar to 10(8) yr) due to gas ejection and gas consumption by star formation activity, GMASS 0953 may likely evolve into a passive galaxy. However, the role of the AGN in depleting the gas reservoir of the galaxy is quite unclear because of the uncertainties affecting the outflow rate.
|Number of pages||18|
|Journal||Monthly Notices of the Royal Astronomical Society|
|Early online date||8-Aug-2019|
|Publication status||Published - Oct-2019|
- galaxies: active, galaxies: evolution, galaxies: high-redshift, galaxies: kinematics and dynamics, GMASS ULTRADEEP SPECTROSCOPY, STAR-FORMATION, ROTATION CURVES, ULTRAVIOLET-SPECTRA, BILLION YEARS, AGN OUTFLOWS, BLACK-HOLES, Z-SIMILAR-TO-2, FEEDBACK, STELLAR