Journal article
A ∼15 kpc outflow cone piercing through the halo of the blue compact metal-poor galaxy SBS 0335-052E
Astronomy and astrophysics (Berlin), Vol.670, p.A121
02/01/2023
DOI: 10.1051/0004-6361/202244930
Abstract
Context. Outflows from low-mass star-forming galaxies are a fundamental ingredient for models of galaxy evolution and cosmology. Despite seemingly favourable conditions for outflow formation in compact starbursting galaxies, convincing observational evidence for kiloparsec-scale outflows in such systems is scarce. Aims. The onset of kiloparsec-scale ionised filaments in the halo of the metal-poor compact dwarf SBS 0335-052E was previously not linked to an outflow. In this paper we investigate whether these filaments provide evidence for an outflow. Methods. We obtained new VLT/MUSE WFM and deep NRAO/VLA B-configuration 21 cm data of the galaxy. The MUSE data provide morphology, kinematics, and emission line ratios of H beta/H alpha and [O III]lambda 5007/H alpha of the low surface-brightness filaments, while the VLA data deliver morphology and kinematics of the neutral gas in and around the system. Both datasets are used in concert for comparisons between the ionised and the neutral phase. Results. We report the prolongation of a lacy filamentary ionised structure up to a projected distance of 16 kpc at SBH alpha = 1.5 x 10(-18) erg s cm(-2) arcsec(-2). The filaments exhibit unusual low H alpha/H beta approximate to 2.4 and low [O III]/H alpha similar to 0.4 - 0.6 typical of diffuse ionised gas. They are spectrally narrow (similar to 20 km s(-1)) and exhibit no velocity sub-structure. The filaments extend outwards from the elongated H I halo. On small scales, the N-HI peak is offset from the main star-forming sites. The morphology and kinematics of H I and H II reveal how star-formation-driven feedback interacts differently with the ionised and the neutral phase. Conclusions. We reason that the filaments are a large-scale manifestation of star-formation- driven feedback, namely limb-brightened edges of a giant outflow cone that protrudes through the halo of this gas-rich system. A simple toy model of such a conical structure is found to be commensurable with the observations.
Details
- Title: Subtitle
- A ∼15 kpc outflow cone piercing through the halo of the blue compact metal-poor galaxy SBS 0335-052E
- Creators
- E. C. Herenz - European Southern ObservatoryJ. Inoue - Macalester CollegeH. Salas - Leibniz Institute for Astrophysics PotsdamB. Koenigs - Macalester CollegeC. Moya-Sierralta - Pontificia Universidad Católica de ChileJ. M. Cannon - Macalester CollegeM. Hayes - AlbaNovaP. Papaderos - Institute of Astrophysics and Space SciencesG. Oestlin - Stockholm UniversityA. Bik - AlbaNovaA. Le Reste - AlbaNovaH. Kusakabe - University of GenevaA. Monreal-Ibero - Leiden UniversityJ. Puschnig - University of Bonn
- Resource Type
- Journal article
- Publication Details
- Astronomy and astrophysics (Berlin), Vol.670, p.A121
- Publisher
- Edp Sciences S A
- DOI
- 10.1051/0004-6361/202244930
- ISSN
- 0004-6361
- eISSN
- 1432-0746
- Number of pages
- 22
- Grant note
- Macalester College 17B-234 / Karl G. Jansky Very Large Array (VLA) AST-2009894 / NSF; National Science Foundation (NSF) ESO Office for Science in Santiago 21211528 / Becas-ANID scholarship 096.B-0690; 0104.B-0834 / ESO Telescopes at the La Silla Paranal Observatory
- Language
- English
- Date published
- 02/01/2023
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627236502771
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