A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä

Cold molecular gas outflow encasing the ionized one in the Seyfert galaxy NGC 3281




Tekijätde Oliveira Bruno Dall’Agnol de, Storchi-Bergmann Thaisa, Morganti Raffaella, Riffel Rogemar A., Ramakrishnan Venkatessh

KustantajaOxford University Press

Julkaisuvuosi2023

JournalMonthly Notices of the Royal Astronomical Society

Tietokannassa oleva lehden nimiMonthly Notices of the Royal Astronomical Society

Vuosikerta522

Numero3

Aloitussivu3753

Lopetussivu3765

eISSN1365-2966

DOIhttps://doi.org/10.1093/mnras/stad1076

Verkko-osoitehttps://academic.oup.com/mnras/article/522/3/3753/7118045

Rinnakkaistallenteen osoitehttps://research.utu.fi/converis/portal/detail/Publication/179814357


Tiivistelmä

We present ALMA CO (2-1) observations of the Seyfert 2 galaxy NGC 3281 at ∼100 pc spatial resolution. This galaxy was previously known to present a bi-conical ionized gas outflow extending to 2 kpc from the nucleus. The analysis of the CO moment and channel maps, as well as kinematic modelling, reveals two main components in the molecular gas: one rotating in the galaxy plane and another outflowing and extending up to ∼1.8–2.6 kpc from the nucleus, partially encasing the ionized component. The mass of the outflowing molecular gas component is Mmol, out = (2.5 ± 1.6) × 106 M , representing ∼1.7–2 per cent of the total molecular gas seen in emission within the inner 2.3 kpc. The corresponding mass outflow rate and power are out,mol = 0.12–0.72 Myr−1 and out,mol = (0.045–1.6) ×1040 erg s−1 , which translates to a kinetic coupling efficiency with the AGN power of only 10−4–0.02 per cent. This value reaches up to 0.1 per cent when including both the feedback in the ionized and molecular gas, as well as considering that only part of the energy couples kinetically with the gas. Some of the non-rotating CO emission can also be attributed to inflow in the galaxy plane towards the nucleus. The similarity of the CO outflow – encasing the ionized gas one and the X-ray emission – to those seen in other sources, suggests that this may be a common property of galactic outflows.


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