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16 April 2024 |
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The Lyman alpha reference sample. VII. Spatially resolved H$alpha$ kinematics | | Edmund Christian Herenz
; Pieter Gruyters
; Ivana Orlitova
; Matthew Hayes
; Göran Östlin
; John M. Cannon
; Martin M. Roth
; Arjan Bik
; Stephen Pardy
; Héctor Otí-Floranes
; J. Miguel Mas-Hesse
; Angela Adamo
; Hakim Atek
; Florent Duval
; Lucia Guaita
; Daniel Kunth
; Peter Laursen
; Jens Melinder
; Johannes Puschnig
; Thøger E. Rivera-Thorsen
; Daniel Schaerer
; Anne Verhamme
; | | Date: |
17 Nov 2015 | | Abstract: | We present integral field spectroscopic observations with the Potsdam Multi
Aperture Spectrophotometer of all 14 galaxies in the $zsim 0.1$ Lyman Alpha
Reference Sample (LARS). We produce 2D line of sight velocity maps and velocity
dispersion maps from the Balmer $alpha$ (H$alpha$) emission in our data
cubes. These maps trace the spectral and spatial properties of the LARS
galaxies’ intrinsic Ly$alpha$ radiation field. We show our kinematic maps
spatially registered onto the Hubble Space Telescope H$alpha$ and Lyman
$alpha$ (Ly$alpha$) images. Only for individual galaxies a causal connection
between spatially resolved H$alpha$ kinematics and Ly$alpha$ photometry can
be conjectured. However, no general trend can be established for the whole
sample. Furthermore, we compute non-parametric global kinematical statistics --
intrinsic velocity dispersion $sigma_0$, shearing velocity $v_mathrm{shear}$,
and the $v_mathrm{shear}/sigma_0$ ratio -- from our kinematic maps. In
general LARS galaxies are characterised by high intrinsic velocity dispersions
(54,km,s$^{-1}$ median) and low shearing velocities (65,km,s$^{-1}$
median). $v_mathrm{shear}/sigma_0$ values range from 0.5 to 3.2 with an
average of 1.5. Noteworthy, five galaxies of the sample are dispersion
dominated systems with $v_mathrm{shear}/sigma_0 <1$ and are thus
kinematically similar to turbulent star forming galaxies seen at high redshift.
When linking our kinematical statistics to the global LARS Ly$alpha$
properties, we find that dispersion dominated systems show higher Ly$alpha$
equivalent widths and higher Ly$alpha$ escape fractions than systems with
$v_mathrm{shear}/sigma_0 > 1$. Our result indicates that turbulence in
actively star-forming systems is causally connected to interstellar medium
conditions that favour an escape of Ly$alpha$ radiation. | | Source: | arXiv, 1511.5406 | | Services: | Forum | Review | PDF | Favorites | |
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