J/A+A/587/A78 LARS VIII. Spatially resolved Halpha kinematics (Herenz+, 2016)
The Lyman alpha reference sample. VII. Spatially resolved Halpha kinematics.
Herenz E.C., Gruyters P., Orlitova I., Hayes M., Ostlin G., Cannon J.M.,
Roth M., Bik A., Pardy S., Oti-Floranes H., Mas-Hesse J.M., Adamo A.,
Atek H., Duval F., Guaita L., Kunth D., Laursen P., Melinder J.,
Puschnig J., Rivera-Thorsen T.E., Schaerer D., Verhamme A.
<Astron. Astrophys. 587, A78 (2016)>
=2016A&A...587A..78H 2016A&A...587A..78H (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra ; Galaxies, optical
Keywords: galaxies: ISM - galaxies: starburst -
cosmology: observations - ultraviolet: galaxies - radiative transfer
Abstract:
We present integral field spectroscopic observations with the Potsdam
Multi-Aperture Spectrophotometer of all 14 galaxies in the z∼0.1 Lyman
Alpha Reference Sample (LARS). We produce 2D line-of-sight velocity
maps and velocity dispersion maps from the Balmer α (Hα)
emission in our data cubes. These maps trace the spectral and spatial
properties of the LARS galaxies' intrinsic Lyα radiation field.
We show our kinematic maps that are spatially registered onto the
Hubble Space Telescope Hα and Lymanα (Lyα) images.
We can conjecture a causal connection between spatially resolved
Hα kinematics and Lyα photometry for individual galaxies.
However, no general trend can be established for the whole sample.
Furthermore, we compute the intrinsic velocity dispersion σ0,
the shearing velocity vshear, and the vshear/σ0 ratio from
our kinematic maps. In general LARS galaxies are characterised by high
intrinsic velocity dispersions (54km/s median) and low shearing
velocities (65km/s median). The vshear/σ0 values range from
0.5 to 3.2 with an average of 1.5. It is noteworthy that five galaxies
of the sample are dispersion-dominated systems with
vshear/σ0<1, and are thus kinematically similar to turbulent
star-forming galaxies seen at high redshift. When linking our
kinematical statistics to the global LARS Lyα properties, we
find that dispersion-dominated systems show higher Lyα
equivalent widths and higher Lyα escape fractions than systems
with vshear/σ0>1. Our result indicates that turbulence in
actively star-forming systems is causally connected to interstellar
medium conditions that favour an escape of Lyα radiation.
Description:
The FITS files contain the reduced Calar-Alto 3.5m PMAS flux
datacubes. Observations and datareduction are described in Sects. 2
and 3 of the paper. We also provide errorcubes and the resolving power
maps that were used in our derivation of the Hα velocity fields.
WCS information is included only in the fluxcubes. The cubes were
registered to our HST imaging data, so the WCS information might not
be correct in an absolute sense. Wavelengths are in air as measured,
i.e. no barycentric correction is applied.
Objects:
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RA (2000) DE Designation(s)
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13 28 44.0 +43 55 51 LARS 1 = Mrk 259
09 07 04.9 +53 26 57 LARS 2 = Shoc 240
13 15 35.1 +62 07 29 LARS 3 = Arp 238
13 07 28.2 +54 26 51 LARS 4 = SDSS J130728.45+542652.3
13 59 50.9 +57 26 23 LARS 5 = Mrk 1486
15 45 44.5 +44 15 49 LARS 6 = KISSR 2019
13 16 03.9 +29 22 54 LARS 7 = IRAS F13136+2938
12 50 13.7 +07 34 42 LARS 8 = SDSS-J125013.50+073441.5
08 23 54.9 +28 06 22 LARS 9 = IRAS 08208+2816
13 01 41.5 +29 22 53 LARS 10 = Mrk 0061
14 03 47.1 +06 28 15 LARS 11 = SDSS J140347.22+062812.1
09 38 13.5 +54 28 25 LARS 12 = LEDA 27453
01 50 28.4 +13 08 59 LARS 13 = IRAS 01477+1254
09 26 00.3 +44 27 36 LARS 14 = SDSS J092600.41+442736.1
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 125 48 List of fits files
fits/* . 48 Individual fits files
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg ? Right ascension of image center (J2000)
10- 18 F9.5 deg DEdeg ? Declination of image center (J2000)
20- 21 I2 --- Nx Number of pixels along X-axis
23- 24 I2 --- Ny Number of pixels along X-axis
26- 29 I4 --- Nz ? Number of slices for data cubes
31- 37 F7.2 0.1nm blambda ? Lower value of wavelength interval
39- 45 F7.2 0.1nm Blambda ? Upper value of wavelength interval
47- 54 F8.6 0.1nm dlambda ? Wavelength resolution
56- 59 I4 Kibyte size Size of FITS file
61- 85 A25 --- FileName Name if the fits file in subdirectory fits
87-125 A39 --- Title Title of the file
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Acknowledgements:
Christian Herenz, cherenz(at)aip.de
References:
Hayes et al., Paper I 2013ApJ...765L..27H 2013ApJ...765L..27H
Hayes et al., Paper II 2014ApJ...782....6H 2014ApJ...782....6H
Pardy et al., Paper III 2014ApJ...794..101P 2014ApJ...794..101P
Guaita et al., Paper IV 2015A&A...576A..51G 2015A&A...576A..51G
Rivera-Thorsen et al., Paper V 2015ApJ...805...14R 2015ApJ...805...14R
(End) Patricia Vannier [CDS] 04-Dec-2015