Spatially resolved kinematics, galactic wind, and quenching of star formation in the luminous infrared galaxy IRAS F11506-3851

摘要: We present a multi-wavelength integral field spectroscopic (IFS) study of the low-z luminous infrared galaxy IRAS F11506-3851 (ESO 320-G030) on basis moderate spectral resolution observations (R 3400 4000) taken with VIMOS and SINFONI instruments at ESO VLT. The morphology 2D kinematics gaseous (neutral ionized) stellar components have been mapped in central regions (<3 kpc) using NaD 5890, 5896 A absorption doublet, H 6563 line, near-IR CO(2‐0) 2.293 m CO(3‐1) 2.322 bands. ionized gas stars are dominated by rotation, large observed velocity amplitudes ( V(H ) = 203 4 km s 1 ; V(CO) 188 11 , respectively) centrally peaked dispersion maps c(H 95 c(CO) 136 20 ). lag behind warm represent dynamically hotter system, as indicated V/ ratios (4.5 2.4 for stars, respectively). Thanks to these IFS data we disentangled contribution interstellar medium feature, finding that it is neutral clouds 2/3 total EW). shows complex structure two main components. On one hand, thick slowly rotating disk V(NaD) 81 12 lags significantly compared has an irregular o -center map (with values up 150 kpc from nucleus). other kpc-scale outflow perpendicular disk, revealed blueshifted velocities (in range 30 154 along galaxy’s semi-minor axis (within inner 1.4 kpc). simple free wind scenario, derive outflowing mass rate ˙ Mw) about 48 M yr . Although this implies global loading factor (i.e., Mw/SFR) 1.4, distribution ongoing SF traced emission suggests much larger value associated < 200 pc), where current star formation (SF) represents only 3 percent total. However, relatively strong supernovae regions, [FeII] emission, indicates recent episodes SF. Therefore, our show clear evidence presence factors nuclear starburst activity took place 7 Myr ago, although currently modest levels. All together results strongly suggest witnessing (nuclear) quenching due feedback F11506-3851. molecular detected region via H2 0S(1) line further may take again.