J/A+A/611/A99 Cores in HII regions parameters (Klaassen+, 2018)
The evolution of young HII regions.
I. Continuum emission and internal dynamics.
Klaassen P.D., Johnston K.G., Urquhart J.S., Mottram J.C., Peters T.,
Kuiper R., Beuther H., van der Tak F.F.S., Goddi C.
<Astron. Astrophys. 611, A99 (2018)>
=2018A&A...611A..99K 2018A&A...611A..99K (SIMBAD/NED BibCode)
ADC_Keywords: H II regions ; Radio sources ; Millimetric/submm sources
Keywords: stars: massive - stars: formation - HII regions -
ISM: kinematics and dynamics - submillimetre: ISM
Abstract:
High-mass stars form in much richer environments than those associated
with isolated low-mass stars, and once they reach a certain mass,
produce ionised (HII) regions. The formation of these pockets of
ionised gas are unique to the formation of high-mass stars
(M>8M☉), and present an excellent opportunity to study the final
stages of accretion, which could include accretion through the HII
region itself.
This study of the dynamics of the gas on both sides of these
ionisation boundaries in very young HII regions aims to quantify the
relationship between the HII regions and their immediate environments.
We present high-resolution (∼0.5") ALMA observations of nine HII
regions selected from the Red MSX Source (RMS, Lumsden et al., Cat.
J/ApJS/208/11) survey with compact radio emission and bolometric
luminosities greater than 104L☉. We focus on the initial
presentation of the data, including initial results from the radio
recombination line H29α some complementary molecules, and the
256GHz continuum emission.
Description:
File tableA2 contains the positions, areas, derived fluxes, masses and
column densities of the cores identified by the clump finding
algorithm Fellwalker.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 88 9 Source locations and beam properties
tablea2.dat 86 68 Clump positions, areas, derived fluxes, masses,
and column densities
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See also:
J/A+A/487/253 : The RMS survey: 13CO observations of YSOs (Urquhart+ 2008)
J/A+A/501/539 : RMS survey. 6cm observations of YSOs (Urquhart+, 2009)
J/ApJS/208/11 : Red MSX Source Survey: massive protostars (Lumsden+, 2013)
J/MNRAS/452/4029 : RMS survey (Urquhart+, 2015)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name HII region name
15- 16 I2 h RAh Peak right ascension (J2000)
18- 19 I2 min RAm Peak right ascension (J2000)
21- 25 F5.2 s RAs Peak right ascension (J2000)
27 A1 --- DE- Peak declination sign (J2000)
28- 29 I2 deg DEd Peak declination (J2000)
31- 32 I2 arcmin DEm Peak declination (J2000)
34- 38 F5.2 arcsec DEs Peak declination (J2000)
39- 43 F5.1 km/s Vlsr LSR velocity
45- 48 F4.2 arcsec Bmaj Synthetised beam major axis
50- 53 F4.2 arcsec Bmin Synthetised beam minor axis
55- 61 F7.2 deg BPA [] Synthetised beam position angle
63- 66 F4.2 mJy/beam rms Continuum rms noise
68- 74 A7 --- SName Short HII region name
76- 83 E8.3 cm-3 ne [1.00e+07] Electron density
85- 88 F4.1 K T [33/99] Temperature
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- SName Short HII region name
10- 11 I2 --- ID Number of the identified core within the
HII region
13- 14 I2 h RAh Peak right ascension (J2000)
16- 17 I2 min RAm Peak right ascension (J2000)
19- 23 F5.2 s RAs Peak right ascension (J2000)
25 A1 --- DE- Peak declination sign (J2000)
26- 27 I2 deg DEd Peak declination (J2000)
29- 30 I2 arcmin DEm Peak declination (J2000)
32- 36 F5.2 arcsec DEs Peak declination (J2000)
38- 42 F5.2 arcsec+2 Area Enclosed area of identified core
44- 49 F6.2 mJy Flux Flux of the identified core of H29α line
51- 56 F6.2 Msun M20K Core mass assuming T=20K
58- 62 F5.2 Msun M50K Core mass assuming T=50K
64- 68 F5.2 Msun M100K Core mass assuming T=100K
70- 74 F5.2 [cm/s2] logN20K Column density assuming T=20K
76- 80 F5.2 [cm/s2] logN50K Column density assuming T=50K
82- 86 F5.2 [cm/s2] logN100K Column density assuming T=100K
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Acknowledgements:
Pamela Klassen, pamela.klaassen(at)stfc.ac.uk
(End) Patricia Vannier [CDS] 14-Dec-2017