J/A+A/604/A101 MUSE datacube of He 2-10 (Cresci+, 2017)
The MUSE view of He 2-10: No AGN ionization but a sparkling starburst.
Cresci G, Vanzi L., Telles E., Lanzuisi G., Brusa M., Mingozzi M.,
Sauvage M., Johnson K.
<Astron. Astrophys. 604, A101 (2017)>
=2017A&A...604A.101C 2017A&A...604A.101C (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra ; Spectra, infrared
Keywords: galaxies: dwarf - galaxies: individual: He 2-10 - galaxies: ISM -
galaxies: starburst - techniques: imaging spectroscopy -
ISM: jets and outflows
Abstract:
We study the physical and dynamical properties of the ionized gas in
the prototypical HII galaxy Henize 2-10 using MUSE integral field
spectroscopy. The large-scale dynamics are dominated by extended
outflowing bubbles that are probably the result of massive gas
ejection from the central star forming regions. We derived a mass
outflow rate dMout/dt∼0.30M☉/yr, corresponding to mass loading
factor η∼0.4, in the range of similar measurements in local LIRGs.
Such a massive outflow has a total kinetic energy that is sustainable
by the stellar winds and supernova remnants expected in the galaxy. We
studied the dust extinction, electron density, and ionization
conditions all across the galaxy with a classical emission line
diagnostic, confirming the extreme nature of the highly star forming
knots in the core of the galaxy, which show high density and high
ionization parameters. We measured the gas-phase metallicity in the
galaxy, taking the strong variation of the ionization parameter into
account, and found that the external parts of the galaxy have
abundances as low as 12+log(O/H)∼8.3, while the central star forming
knots are highly enriched with super solar metallicity. We found no
sign of AGN ionization in the galaxy, despite the recent claim of the
presence of a supermassive active black hole in the core of He 2-10.
We therefore reanalyzed the X-ray data that were used to propose the
presence of the AGN, but we concluded that the observed X-ray emission
can be better explained with sources of a different nature, such as a
supernova remnant.
Description:
MUSE pipeline reduced datacube of He2-10.
Objects:
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RA (2000) DE Designation(s)
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08 36 15.19 -26 24 33.7 Hen 2-10 = LEDA 24175
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 103 1 Information of fits datacube
cube_He2-10.fits 2880 1076611 MUSE datacube
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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 center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 F3.1 arcsec/pix scale Scale of the image
24- 26 I3 --- Nx Number of pixels along X-axis
28- 30 I3 --- Ny Number of pixels along Y-axis
32- 35 I4 --- Nz Number of pixels along Z-axis
37- 43 F7.2 0.1nm blambda Lower value of wavelength interval
45- 51 F7.2 0.1nm Blambda Upper value of wavelength interval
53- 56 F4.2 0.1nm dlambda Wavelength resolution
58- 64 I7 Kibyte size Size of FITS file
66- 81 A16 --- FileName Name of FITS file
83-103 A21 --- Title Title of the FITS file
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Acknowledgements:
Giovanni Cresci, gcresci(at)arcetri.astro.it
(End) Giovanni Cresci [INAF, Arcetri], Patricia Vannier [CDS] 10-May-2017