J/ApJ/867/165 CO molecular clumps in Henize 2-10 dwarf galaxy (Beck+, 2018)
Dense molecular filaments feeding a starburst: ALMA maps of CO(3-2) in
Henize 2-10.
Beck S.C., Turner J.L., Consiglio S.M.
<Astrophys. J., 867, 165 (2018)>
=2018ApJ...867..165B 2018ApJ...867..165B
ADC_Keywords: Carbon monoxide; Galaxies, radio; Interstellar medium;
Molecular data
Keywords: galaxies: dwarf; galaxies: individual (He 2-10); galaxies: starburst;
galaxies: star clusters: general; ISM: molecules
Abstract:
We present Atacama Large Millimeter/Submillimeter Array CO(3-2)
observations at 0.3" resolution of He 2-10, a starburst dwarf galaxy
and possible high-z galaxy analog. The warm dense gas traced by
CO(3-2) is found in clumpy filaments that are kinematically and
spatially distinct. The filaments have no preferred orientation or
direction; this may indicate that the galaxy is not evolving into a
disk galaxy. Filaments appear to be feeding the active starburst; the
velocity field in one filament suggests acceleration onto an embedded
star cluster. The relative strengths of CO(3-2) and radio continuum
vary strongly on decaparsec scales in the starburst. There is no
CO(3-2) clump coincident with the nonthermal radio source that has
been suggested to be an AGN, nor unusual kinematics. The kinematics of
the molecular gas show significant activity that is apparently
unrelated to the current starburst. The longest filament, east of the
starburst, has a pronounced shear of FWHM ∼40km/s across its ∼50pc
width over its entire ∼0.5kpc length. The cause of the shear is not
clear. This filament is close in projection to a "dynamically
distinct" CO feature previously seen in CO(1-0). The most complex
region and the most highly disturbed gas velocities are in a region
200pc south of the starburst. The CO(3-2) emission there reveals a
molecular outflow, of line width FWZI∼120-140km/s, requiring an energy
≳1053erg/s. There is at present no candidate for the driving source
of this outflow.
Description:
We have obtained ALMA observations of Hen 2-10 at 0.3" resolution in
the CO(3-2) emission line at 345GHz.
Hen 2-10 was observed with ALMA in the C40-4 array on 2016 November 15
in the program 2016.1.00492 (S. Beck, PI).
Objects:
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RA (ICRS) DE Designation(s)
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08 36 15.19 -26 24 33.7 He 2-10 = Hen 2-10
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 65 71 Molecular clumps in He 2-10
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See also:
J/A+A/574/A126 : HeViCS. XVIII. Star-forming dwarf galaxies (Grossi+, 2015)
J/ApJ/829/93 : CO, [CI] & [NII] lines from Herschel spectra (Kamenetzky+, 2016)
J/A+A/604/A101 : MUSE datacube of He 2-10 (Cresci+, 2017)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [0/70] Clump ID, running sequence number
4- 14 F11.7 deg RAdeg [129.059/129.07] Right Ascension (J2000)
16- 27 F12.8 deg DEdeg [-26.42/-26.4] Declination (J2000)
29- 34 F6.2 pc Lmaj [5.6/136.2]? Major axis, ellipsoidal fit with
Dist=9Mpc, deconvolved
36- 40 F5.1 km/s Vel [819.4/898.1] Peak line velocity
42- 45 F4.1 km/s FWHM [4.8/96.5] Velocity, full width at half maximum,
deconvolved
47- 49 I3 K.km/s Flux [1/449] Flux
51- 57 E7.1 Lsun Lum [2200/860000] Luminosity
59- 65 E7.1 Msun Mass [11000/4500000] Mass, from CO line flux
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 21-Oct-2019