The SAMI Galaxy Survey: shocks and outflows in a normal star-forming galaxy
By I. Ho, Lisa J. Kewley, M. Dopita, A. Medling, J. Allen, Joss Bland-Hawthorn, J. Bloom, J. Bryant, Scott M. Croom, L. Fogarty and 8 more. 2014
138 citations recorded by the source corpus.
We demonstrate the feasibility and potential of using large integral field spectroscopic surveys to investigate the prevalence of galactic-scale outflows in the local Universe. Using integral field data from SAMI and the Wide Field Spectrograph, we study the nature of an isolated disk galaxy, SDSS J090005.05+000446.7 (z = 0.05386). In the integral field datasets, the galaxy presents skewed line profiles changing with position in the galaxy. The skewed line profiles are caused by different kinematic components overlapping in the line-of-sight direction. We perform spectral decomposition to separate the line profiles in each spatial pixel as combinations of (1) a narrow kinematic component consistent with HII regions, (2) a broad kinematic component consistent with shock excitation, and (3) an intermediate component consistent with shock excitation and photoionisation mixing. The three kinematic components have distinctly different velocity fields, velocity dispersions, line ratios, and electron densities. We model the line ratios, velocity dispersions, and electron densities with our MAPPINGS IV shock and photoionisation models, and we reach remarkable agreement between the data and the models. The models demonstrate that the different emission line properties are caused by major galactic outflows that introduce shock excitation in addition to photoionisation by star-forming activities. Interstellar shocks embedded in the outflows shock-excite and compress the gas, causing the elevated line ratios, velocity dispersions, and electron densities observed in the broad kinematic component. We argue from energy considerations that, with the lack of a powerful active galactic nucleus, the outflows are likely to be driven by starburst activities. Our results set a benchmark of the type of analysis that can be achieved by the SAMI Galaxy Survey on large numbers of galaxies.
Subfields: Astronomy and Astrophysics, Global and Planetary Change
View Paper: https://www.semanticscholar.org/paper/d0c20a1457abb571eff155b93d37980fb7dc8579
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In Astronomy and Astrophysics
- P. Hopkins
- L. Hernquist
- C. Conroy
- R. Dav'e
- Simon D. M. White
- M. Cappellari
- R. Somerville
- Christopher J. Conselice
In Global and Planetary Change
Citations in the corpus
- SDSS IV MaNGA – spatially resolved diagnostic diagrams: a proof that many galaxies are LIERs (2016, background): “It is well known that the BPT diagram does not represent a good test for shock ionisation, as shock models cover larger areas of both the LIER and SF sequences (Allen et al. 2008; Rich et al. 2010, 2011; Ho et al. 2014; Alatalo et al. 2016).”
- The SAMI Galaxy Survey: Instrument specification and target selection (2014, background): “The high spectral resolution of SAMI is ideal for de-blending complex line profiles (see, for example Fogarty et al. 2014; Ho et al. 2014) across the broad range of galaxy types.”
- PyNeb: a new tool for analyzing emission lines - I. Code description and validation of results (2014, unknown): “…of papers (GarcíaRojas et al. 2012, 2013, 2014; Esteban et al. 2013, 2014; Kameswara Rao et al. 2013; Nicholls et al. 2013, 2014; Marino et al. 2013; Delgado-Inglada et al. 2014; Delgado-Inglada & Rodríguez 2014; Mesa-Delgado et al. 2014; Sankrit et al. 2014; Ho et al. 2014; Pérez-Montero 2014).”