Artículos de revistas
Comparing the pre-SNe feedback and environmental pressures for 6000 HII regions across 19 nearby spiral galaxies
Fecha
2021Registro en:
MNRAS 000, 1–27 (2021)
10.1093/mnras/stab2958
Autor
Barnes, A. T.
Glover, S. C. O.
Kreckel, K.
Ostriker, E. C.
Bigiel, F.
Belfiore, F.
Beslic, I.
Blanc Mendiberri, Guillermo Alberto Neville
Chevance, M.
Dale, D. A.
Egorov, O.
Eibensteiner, C.
Emsellem, E.
Grasha, K.
Groves, B. A.
Klessen, R. S.
Kruijssen, J. M. D.
Leroy, A. K.
Longmore, S. N.
López, L.
McElroy, R.
Meidt, S. E.
Murphy, E. J.
Rosolowsky, E.
Saito, T.
Santoro, F.
Schinnerer, E.
Schruba, A.
Sun, J.
Watkins, E. J.
Williams, T. G.
Institución
Resumen
The feedback from young stars (i.e. pre-supernova) is thought to play a crucial role in molecular cloud destruction. In this paper, we assess the feedback mechanisms acting within a sample of 5810 Hii regions identified from the PHANGS-MUSE survey of 19 nearby (<20Mpc) star-forming, main-sequence spiral galaxies [log(M-star/M-circle dot) = 9.4-11]. These optical spectroscopic maps are essential to constrain the physical properties of the Hii regions, which we use to investigate their internal pressure terms. We estimate the photoionized gas (P-therm), direct radiation (P-rad), and mechanical wind pressure (P-wind), which we compare to the confining pressure of their host environment (P-de). The Hii regions remain unresolved within our similar to 50-100pc resolution observations, so we place upper (P-max) and lower (P-min) limits on each of the pressures by using a minimum (i.e. clumpy structure) and maximum (i.e. smooth structure) size, respectively. We find that the P-max measurements are broadly similar, and for P-min the P-therm is mildly dominant. We find that the majority of Hii regions are overpressured, P-tot/P-de = (P-therm + P-wind + P-rad)/P-de > 1, and expanding, yet there is a small sample of compact Hii regions with P-tot,P-max/P-de < 1 (similar to 1 per cent of the sample). These mostly reside in galaxy centres (R-gal < 1kpc), or, specifically, environments of high gas surface density; log(Sigma(gas)/M(circle dot)pc(-2)) similar to 2.5 (measured on kpc-scales). Lastly, we compare to a sample of literature measurements for P-therm and P(rad)to investigate how dominant pressure term transitions over around 5dex in spatial dynamic range and 10dex in pressure.