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18 April 2024 |
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VALES VII: Molecular and ionized gas properties in pressure balanced interstellar medium of starburst galaxies at z ~ 0.15 | | Juan Molina
; Edo Ibar
; Nicolas Godoy
; Andres Escala
; Tomonari Michiyama
; Cheng Cheng
; Thomas M. Hughes
; Maarten Baes
; Yongquan Xue
; Michał J. Michałowski
; Paul van der Werf
; Xue-Jian Jiang
; | | Date: |
17 Sep 2020 | | Abstract: | Context. Spatially resolved observations of the ionized and molecular gas are
critical for understanding the physical processes that govern the interstellar
medium (ISM) in galaxies. Aims. To study the morpho-kinematic properties of the
ionized and molecular gas in three dusty starburst galaxies at $z = 0.12-0.17$
to explore the relation between molecular ISM gas phase dynamics and the
star-formation activity. Methods. We analyse $sim$kpc-scale ALMA CO(1--0) and
seeing limited SINFONI Paschen-$alpha$ observations. We use a dynamical mass
model, which accounts for beam-smearing effects, to constrain the CO-to-H$_2$
conversion factor. Results. One starburst galaxy shows irregular morphology
which may indicate a major merger, while the other two systems show disc-like
morpho-kinematics. The two disc-like starbursts show molecular gas velocity
dispersion values comparable with that seen in local LIRG/ULIRGs, but in an ISM
with molecular gas fraction and surface density values consistent to that
reported for local star-forming galaxies. These molecular gas velocity
dispersion values can be explained by assuming vertical pressure equilibrium.
The star-formation activity is correlated with the molecular gas content
suggesting depletion times of the order of $sim 0.1-1$ Gyr. The star formation
rate surface density ($Sigma_{
m SFR}$) correlates with the ISM pressure set
by self-gravity ($P_{
m grav}$) following a power law with an exponent close
to 0.8. Conclusions. In dusty disc-like starburst galaxies, our data support
the scenario in which the molecular gas velocity dispersion values are driven
by the ISM pressure set by self-gravity, responsible to maintain the vertical
pressure balance. The correlation between $Sigma_{
m SFR}$ and $P_{
m grav}$
suggests that, in these dusty starbursts galaxies, the star formation activity
arises as a consequence of the ISM pressure balance. | | Source: | arXiv, 2009.08446 | | Services: | Forum | Review | PDF | Favorites | |
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