Stellar feedback in M83 as observed with MUSE : I. Overview, an unprecedented view of the stellar and gas kinematics and evidence of outflowing gas
(2022) In Astronomy and Astrophysics 660.- Abstract
Context. Young massive stars inject energy and momentum into the surrounding gas, creating a multi-phase interstellar medium (ISM) and regulating further star formation. The main challenge of studying stellar feedback proves to be the variety of scales spanned by this phenomenon, ranging from the immediate surrounding of the stars (Ha II regions, 10s pc scales) to galactic-wide kiloparsec scales. Aims. We present a large mosaic (3.8a A - a 3.8 kpc) of the nearby spiral galaxy M83, obtained with the MUSE instrument at ESO Very Large Telescope. The integral field spectroscopy data cover a large portion of the optical disk at a resolution of a 14;20 pc, allowing the characterisation of single Ha II regions while sampling diverse dynamical... (More)
Context. Young massive stars inject energy and momentum into the surrounding gas, creating a multi-phase interstellar medium (ISM) and regulating further star formation. The main challenge of studying stellar feedback proves to be the variety of scales spanned by this phenomenon, ranging from the immediate surrounding of the stars (Ha II regions, 10s pc scales) to galactic-wide kiloparsec scales. Aims. We present a large mosaic (3.8a A - a 3.8 kpc) of the nearby spiral galaxy M83, obtained with the MUSE instrument at ESO Very Large Telescope. The integral field spectroscopy data cover a large portion of the optical disk at a resolution of a 14;20 pc, allowing the characterisation of single Ha II regions while sampling diverse dynamical regions in the galaxy. Methods. We obtained the kinematics of the stars and ionised gas, and compared them with molecular gas kinematics observed in CO(2-1) with the ALMA telescope array. We separated the ionised gas into Ha II regions and diffuse ionised gas (DIG) and investigated how the fraction of Hα luminosity originating from the DIG (fDIG) varies with galactic radius. Results. We observe that both stars and gas trace the galactic disk rotation, as well as a fast-rotating nuclear component (30a 3; 700 pc in diameter), likely connected to secular processes driven by the galactic bar. In the gas kinematics, we observe a stream east of the nucleus (50a 3; 1250 pc in size), redshifted with respect to the disk. The stream is surrounded by an extended ionised gas region (1000a A - a 1600 pc) with enhanced velocity dispersion and a high ionisation state, which is largely consistent with being ionised by slow shocks. We interpret this feature as either the superposition of the disk and an extraplanar layer of DIG, or as a bar-driven inflow of shocked gas. A double Gaussian component fit to the Hα line also reveals the presence of a nuclear biconic structure whose axis of symmetry is perpendicular to the bar. The two cones (20a 3; 500 pc in size) appear blue- and redshifted along the line of sight. The cones stand out for having an Hα emission separated by up to 200 km sa 1 from that of the disk, and a high velocity dispersion a 14;80a 200 km sa 1. At the far end of the cones, we observe that the gas is consistent with being ionised by shocks. These features had never been observed before in M83; we postulate that they are tracing a starburst-driven outflow shocking into the surrounding ISM. Finally, we obtain fDIGa 14;13% in our field of view, and observe that the DIG contribution varies radially between 0.8 and 46%, peaking in the interarm region. We inspect the emission of the Ha II regions and DIG in aBPTa diagrams, finding that in Ha II regions photoionisation accounts for 99.8% of the Hα flux, whereas the DIG has a mixed contribution from photoionisation (94.9%) and shocks (5.1%).
(Less)
- author
- organization
- publishing date
- 2022-04-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Galaxies: general, Galaxies: individual: NGC 5236, Galaxies: ISM, Galaxies: kinematics and dynamics, Ha II regions, ISM: structure
- in
- Astronomy and Astrophysics
- volume
- 660
- article number
- A77
- publisher
- EDP Sciences
- external identifiers
-
- scopus:85128451974
- ISSN
- 0004-6361
- DOI
- 10.1051/0004-6361/202142315
- language
- English
- LU publication?
- yes
- id
- bd9c1297-2b50-4b3a-b6a9-7df9d7ed1c17
- date added to LUP
- 2022-07-06 14:25:49
- date last changed
- 2024-04-18 04:53:50
@article{bd9c1297-2b50-4b3a-b6a9-7df9d7ed1c17,
abstract = {{<p>Context. Young massive stars inject energy and momentum into the surrounding gas, creating a multi-phase interstellar medium (ISM) and regulating further star formation. The main challenge of studying stellar feedback proves to be the variety of scales spanned by this phenomenon, ranging from the immediate surrounding of the stars (Ha II regions, 10s pc scales) to galactic-wide kiloparsec scales. Aims. We present a large mosaic (3.8a A - a 3.8 kpc) of the nearby spiral galaxy M83, obtained with the MUSE instrument at ESO Very Large Telescope. The integral field spectroscopy data cover a large portion of the optical disk at a resolution of a 14;20 pc, allowing the characterisation of single Ha II regions while sampling diverse dynamical regions in the galaxy. Methods. We obtained the kinematics of the stars and ionised gas, and compared them with molecular gas kinematics observed in CO(2-1) with the ALMA telescope array. We separated the ionised gas into Ha II regions and diffuse ionised gas (DIG) and investigated how the fraction of Hα luminosity originating from the DIG (fDIG) varies with galactic radius. Results. We observe that both stars and gas trace the galactic disk rotation, as well as a fast-rotating nuclear component (30a 3; 700 pc in diameter), likely connected to secular processes driven by the galactic bar. In the gas kinematics, we observe a stream east of the nucleus (50a 3; 1250 pc in size), redshifted with respect to the disk. The stream is surrounded by an extended ionised gas region (1000a A - a 1600 pc) with enhanced velocity dispersion and a high ionisation state, which is largely consistent with being ionised by slow shocks. We interpret this feature as either the superposition of the disk and an extraplanar layer of DIG, or as a bar-driven inflow of shocked gas. A double Gaussian component fit to the Hα line also reveals the presence of a nuclear biconic structure whose axis of symmetry is perpendicular to the bar. The two cones (20a 3; 500 pc in size) appear blue- and redshifted along the line of sight. The cones stand out for having an Hα emission separated by up to 200 km sa 1 from that of the disk, and a high velocity dispersion a 14;80a 200 km sa 1. At the far end of the cones, we observe that the gas is consistent with being ionised by shocks. These features had never been observed before in M83; we postulate that they are tracing a starburst-driven outflow shocking into the surrounding ISM. Finally, we obtain fDIGa 14;13% in our field of view, and observe that the DIG contribution varies radially between 0.8 and 46%, peaking in the interarm region. We inspect the emission of the Ha II regions and DIG in aBPTa diagrams, finding that in Ha II regions photoionisation accounts for 99.8% of the Hα flux, whereas the DIG has a mixed contribution from photoionisation (94.9%) and shocks (5.1%). </p>}},
author = {{Della Bruna, Lorenza and Adamo, Angela and Amram, Philippe and Rosolowsky, Erik and Usher, Christopher and Sirressi, Mattia and Schruba, Andreas and Emsellem, Eric and Leroy, Adam and Bik, Arjan and Blair, William P. and McLeod, Anna F. and Astlin, Goran and Renaud, Florent and Robert, Carmelle and Rousseau-Nepton, Laurie and Smith, Linda J.}},
issn = {{0004-6361}},
keywords = {{Galaxies: general; Galaxies: individual: NGC 5236; Galaxies: ISM; Galaxies: kinematics and dynamics; Ha II regions; ISM: structure}},
language = {{eng}},
month = {{04}},
publisher = {{EDP Sciences}},
series = {{Astronomy and Astrophysics}},
title = {{Stellar feedback in M83 as observed with MUSE : I. Overview, an unprecedented view of the stellar and gas kinematics and evidence of outflowing gas}},
url = {{http://dx.doi.org/10.1051/0004-6361/202142315}},
doi = {{10.1051/0004-6361/202142315}},
volume = {{660}},
year = {{2022}},
}