J/other/IJAA/4.571 Methanol masers in HII regions (Farmer, 2014)
Disk-outflow models as applied to high mass star forming regions through
methanol and water maser observations.
Farmer H.
<Int. J. Astron. Astrophys., 4, 571 (2014)>
=2014IJAA....4..571F 2014IJAA....4..571F
ADC_Keywords: H II regions ; Masers
Keywords: masers - methanol - massive star formation - stars: evolution -
stars: distances
Abstract:
As the recent publication by Breen et al. (2013MNRAS.435..524B 2013MNRAS.435..524B) found,
Class II methanol masers are exclusively associated with high mass
star forming regions. Based on the positions of the Class I and II
methanol and H2O masers, UC HII regions and 4.5um infrared
sources, and the center velocities (vLSR) of the Class I methanol and
H2O masers, compared to the vLSR of the Class II methanol masers, we
propose three disk-outflow models that may be traced by methanol
masers. In all three models, we have located the Class II methanol
maser near the protostar, and the Class I methanol maser in the
outflow, as is known from observations during the last twenty years.
In our first model, the H2O masers trace the linear extent of the
outflow. In our second model, the H2O masers are located in a
circumstellar disk. In our third model, the H2O masers are located
in one or more outflows near the terminating shock where the outflow
impacts the ambient interstellar medium. Together, these models
reiterate the utility of coordinated high angular resolution
observations of high mass star forming regions in maser lines and
associated star formation tracers.
Description:
The data in these tables will allow the reconstruction of the line
spectra and maps created for my study. Each table gives the positions
(RA,Dec) of each object. Their distances from the Class II Methanol
Masers. and their line of sight velocities LSR.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tables.dat 105 69 *Positions and associated information for sources
associated with 8 regions (tables 1-8 of the paper)
table9.dat 68 20 *Regions with high resolution data for methanol
masers only
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Note on tables.dat: Sources consulted for data presented reported different
significant figures. For convenience the data have been rounded to the least
number of significant figures.
Note on table9.dat: For a valid comparison across sources, the data has been
rounded to the least number of significant figures.
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See also:
J/A+AS/120/283 : Water maser features in UC HII regions (Hofner+ 1996)
J/ApJS/155/149 : CH3OH 70-61 A+ maser sources (Kurtz+, 2004)
J/AZh/84/579 : Catalog of Class I methanol masers (Val'tts+, 2007)
J/A+A/501/539 : RMS survey. 6cm observations of YSOs (Urquhart+, 2009)
Byte-by-byte Description of file: tables.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Region Name of the HII region (GLL.ll+B.bb) (1)
13- 43 A31 --- Type Associated maser type
45 A1 --- r_Type Reference for source type (2)
47- 48 I2 h RAh Associated maser right ascension (J2000)
50- 51 I2 min RAm Associated maser right ascension (J2000)
53- 57 F5.2 s RAs Associated maser right ascension (J2000)
59 A1 --- DE- Associated maser declination sign (J2000)
60- 61 I2 deg DEd Associated maser declination (J2000)
63- 64 I2 arcmin DEm Associated maser declination (J2000)
66- 67 I2 arcsec DEs Associated maser declination (J2000)
69- 74 A6 --- Tel Observing telescope (3)
76 A1 --- n_Tel Note on telescope (3)
78- 82 F5.3 arcsec Beam1 [0.001/3.5] Synthesized Beam (4)
83 A1 --- --- [x]
84- 88 F5.3 arcsec Beam2 [0.001/1.8] Synthesized Beam (4)
90- 95 F6.2 km/s Vlsr [-18/124]? Associated maser LSR velocity
96 A1 --- n_Vlsr [m] Ultra-compact HII region (5)
98-104 F7.2 Jy Int [0.3/5500]? Associated maser intensity
105 A1 --- n_Int [m] Ultra-compact HII region (5)
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Note (1): Studied regions are G9.62+0.19 (table1), G10.47+0.03 (table2),
G12.20-0.11 (table3), G31.41+0.31 (table4), G35.03+0.35 (table5),
G45.07+0.13 (table6), G45.47+0.07 (table7), G75.78+0.34 (table8).
Note (2): References for source type as follows:
a = Kurtz et al., 2004ApJS..155..149K 2004ApJS..155..149K , Cat. J/ApJS/155/149
b = Caswell et al., 1995MNRAS.272...96C 1995MNRAS.272...96C
c = Hofner & Churchwell, 1996A&AS..120..283H 1996A&AS..120..283H, Cat. J/A+AS/120/283
d = Wood & Churchwell, 1989ApJS...69..831W 1989ApJS...69..831W
e = Urquhart et al., 2009A&A...501..539U 2009A&A...501..539U, Cat. J/A+A/501/539
f = Pandian et al., 2011ApJ...730...55P 2011ApJ...730...55P
g = All 44GHz class I methanol masers in this section were found in Val'tts
et al. (2007ARep...51..519V 2007ARep...51..519V, Cat. J/AZh/84/579) and Kurtz et al.
(2004ApJS..155..149K 2004ApJS..155..149K, Cat. J/ApJS/155/149)
h = Minier et al., 2001A&A...369..278M 2001A&A...369..278M
i = All of these UC HII regions were reported in Forster & Caswell
(2000ApJ...530..371F 2000ApJ...530..371F). They explain that their observations were taken
at both 8.2 and 9.2GHz.
Note (3): The telescopes are:
VLA = The Karl G. Jansky Very Large Array (j)
VLBA = The Very Long Baseline Array (h)
ATCA = The Australia Telescope Compact Array (k)
MERLIN = Multi-Element Radio Linked Interferometer Network (l)
Note (4): Information on the resolution of each observing instrument differs
between instruments and configurations of the same instrument.
Note (5): UC-HII regions are continuum data and, therefore, produce no
line profile information.
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Region HII region name
13 A1 --- n_Region Data origin (1)
15- 16 I2 h RAh HII region right ascension (J2000)
18- 19 I2 min RAm HII region right ascension (J2000)
21- 25 F5.2 s RAs HII region right ascension (J2000)
27 A1 --- DE- HII region declination sign (J2000)
28- 29 I2 deg DEd HII region declination (J2000)
31- 32 I2 arcmin DEm HII region declination (J2000)
34- 37 F4.1 arcsec DEs HII region declination (J2000)
39- 42 F4.2 pc Offset [0/2.2] Distance between Class-I and Class-II
methanol masers (2)
44- 47 F4.2 pc e_Offset [0.01/0.06] rms uncertainty on Offset (2)
49- 51 I3 km/s Vlsr1 LSR velocity for 44GHz Class I CH3OH maser
53- 57 F5.2 Jy Int1 Intensity for 44GHz Class I CH3OH maser
59- 61 I3 km/s Vlsr2 LSR velocity for 6.7GHz Class II CH3OH maser
63- 67 F5.2 Jy Int2 ? Intensity for 6.7GHz Class II CH3OH maser
68 A1 --- n_Int2 [d] Note on Int2 (1)
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Note (1): Note as follows:
a = Kurtz et al., 2004ApJS..155..149K 2004ApJS..155..149K , Cat. J/ApJS/155/149
b = Cyganowski et al., 2009ApJ...702.1615C 2009ApJ...702.1615C, Cat. J/ApJ/702/1615
c = Pestalozzi et al., 2005A&A...432..737P 2005A&A...432..737P, Cat. J/A+A/432/737
d = Pestalozzi et al., 2005A&A...432..737P 2005A&A...432..737P, Cat. J/A+A/432/737 reports a
position fix only
Note (2): Class-I CH3COH masers (MMI, 44GHz) are associated to outflows,
while Class-II masers (MMII, 6.7GHz) are associated to mass protostars.
The values in this column were computed using a measurement of the
distance from our sun to the region in question, the error indicates the
propagated uncertainty in the determination of the heliocentric distance.
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Acknowledgements:
Hontas F. Farmer, hfarmer(at)ccc.edu
(End) H. Farmer [Richard J. Daley College], P. Vannier [CDS] 22-Dec-2014