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J/A+AS/124/205 W3 star-forming region 345 GHz survey (Helmich+ 1997)
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Physical and chemical variations within the W 3 star-forming region.
II. The 345 GHz spectral line survey
Helmich F.P., Van Dishoeck E.F.
<Astron. Astrophys. Suppl. Ser. 124, 205 (1997)>
=1997A&AS..124..205H (SIMBAD/NED BibCode)
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ADC_Keywords: Interstellar medium ; Infrared sources ; Radio lines
Keywords: ISM: molecules - ISM: clouds -
ISM: individual: W 3 IRS5, W 3 IRS4, W 3(H2O) - surveys -
radio lines: ISM
Abstract:
Results are presented of the 345 GHz spectral survey toward three
sources in the W 3 Giant Molecular Cloud: W 3 IRS4, W 3 IRS5 and W
3(H_2_O). Nearly 90% of the atmospheric window between 334 and 365GHz
has been scanned using the James Clerk Maxwell Telescope (JCMT) down
to a noise level of ~80mK per resolution element. These observations
are complemented by a large amount of data in the 230GHz
atmospheric window. From this data set physical conditions and
beam-averaged column densities are derived for more than 14 chemically
different species (over 24 different isotopes). The physical
parameters derived in Paper I (Helmich et al., 1994A&A...283..626H)
are confirmed by the analysis of the excitation of other species,
although there is evidence that the silicon- and sulfur-bearing
molecules exist in a somewhat denser and warmer environment. The
densities are high, >=10^6^cm^-3^, in the three sources and the
kinetic temperatures for the bulk of the gas range from 55K for IRS4
to 220K for W 3(H_2_O). The chemical differences between the three
sources are very striking: silicon- and sulfur-bearing molecules such
as SiO and SO_2_ are prominent toward IRS5, whereas organic molecules
like CH_3_OH, CH_3_OCH_3_ and CH_3_OCHO are at least an order of
magnitude more abundant toward W 3(H_2_O). Vibrationally excited
molecules are also detected toward this source. Only simple molecules
are found toward IRS4. The data provide constraints on the amount of
deuterium fractionation and the ionization fraction in the observed
regions as well. These chemical characteristics are discussed in the
context of an evolutionary sequence, in which IRS5 is the youngest, W
3(H_2_O) somewhat older and IRS4, although still enigmatic, the
oldest.
Objects:
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RA (2000) DE Designation(s)
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02 25 30.8 +62 06 21 W 3 IRS 4
02 25 40.6 +62 05 52 W 3 IRS 5
02 27 04.6 +61 52 25 W 3 (H2O)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table7 141 276 *Gaussian fit parameters
table8 49 22 CH_3_OH Gaussian fit parameters W 3 IRS4
table9 49 13 CH_3_OH Gaussian fit parameters W 3 IRS5
table10 75 126 CH_3_OH Gaussian fit parameters W 3(H_2_O)
table11 64 38 CH_3_OCH_3_ Gaussian fit parameters W 3(H_2_O)
table12 77 51 CH_3_OCHO Gaussian fit parameters W 3(H_2_O)
tables.tex 78 1310 LaTeX version of the tables
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Note on table7: The sums of the integrated intensities of the lines
listed in tables 7-12 except for CO and its isotopomers are 160, 330
and 850K.km/s for W 3 IRS4, W 3 IRS5 and W 3(H_2_O) respectively in
the 230 GHz window and 410, 920 and 1760K.km/s in the 345GHz window.
The sums of the integrated intensities of CO and its isotopomers in
table 7 are 380, 720 and 180K.km/s for W 3 IRS4, W 3 IRS5 and W
3(H_2_O) respectively in the 230GHz region and 550, 940 and 360K.km/s
in the 345GHz window.
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Byte-by-byte Description of file: table7
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Bytes Format Units Label Explanations
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1- 19 A19 --- Species Species
21- 22 A2 --- n_Species Note on species (2)
24- 31 F8.1 MHz nu Frequency
33- 69 A37 --- J Transition designation
70 A1 --- l_TMBa Limit flag on TMBa (1)
71- 76 F6.3 K TMBa ? W3 IRS4 temperature
77 A1 --- n_TMBa Note on TMBa (2)
79- 82 F4.2 km/s DVa ? W3 IRS4 {DELTA}V
84- 89 F6.2 K.km/s Wa ? W3 IRS4 integrated intensity
91 A1 --- l_TMBb Limit flag on TMBb (1)
92- 97 F6.3 K TMBb ? W3 IRS5 temperature
98-100 A3 --- n_TMBb Note on TMBb (2)
103-107 F5.2 km/s DVb ? W3 IRS5 {DELTA}V
109-114 F6.2 K.km/s Wb ? W3 IRS5 integrated intensity
116 A1 --- l_TMBc Limit flag on TMBc (1)
117-122 F6.3 K TMBc ? W3 (H2O) temperature
123-126 A4 --- n_TMBc Note on TMBa (2)
128-131 F4.2 km/s DVc ? W3 (H2O) {DELTA}V
133 A1 --- n_DVc Note on DVc (2)
136-141 F6.2 K.km/s Wc ? W3 (H2O) integrated intensity
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Note (1): All upper limits are 2 times the rms noise in one resolution element
(generally two channels).
Note (2): 1: Gaussian decomposition not unique because of selfreversed profile
and strong wings, only integral under line given.
2: Distorted profile, cause unknown.
3: Gaussian decomposition not unique because of strong wings, only
peak temperature given.
4: The {DELTA}V is kept fixed in the Gaussian fit.
5: On edge of spectrum.
6: Bad base line.
7: Line offset by 3 MHz, incorrect identification?
a: Blended with CH_3_OCH_3_ 339491.
b: Blended with C^34^S 7--6.
c: H^13^CN 4--3 always blended with SO_2_ 345338.
d: HC^15^N 3--2 blended with CH_3_OCH_3_ 260754/56/58/61.
e: HNC 4--3 blended with SO_2_ 359770.
f: HN^13^C 3--2 blended with SO_2_ 258666.
g: Blended with CH_3_OCH_3_ 358447-358456.
h: In wing SO_2_ 351257.
i: H_2_CS 244047 blended with HNCO 240875/6.
j: CH_3_CCH 358818 blended with CH_3_CCH 358811.
k: Uncertain, could also be a base-line ripple
l: H_2_CO 5_42_-4_41_ and 5_41_-4_40_ are always blended.
m: H_2_CO 364289 blended with CH_3_OH 360849.
n: Blended with H_2_CS and CN.
o: H_2_^13^CO 354898 blended with SO_2_ 358013.
p: H_2_^13^CO 355041 blended with SO_2_ 355045.
q: CH_3_CN 257507/22/27 blended with CH_3_OCHO 260384/392 /404/415.
r: CH_3_CN 257522 blended with CH_3_OCH_3_ 260400/1/3/5
s: Blended with CCH 349337/8.
t: CH_3_CN 349446 blended with CH_3_CN 349453.
u: Blended with CH_3_OH 243915.
v: SO 346528 always blended with SO_2_ 346523.
w: ^34^SO 337582 blended with CH_3_OH 337581.
x: Large frequency error in line catalogues.
y: Four hyperfine components of ^33^SO blended with CH_3_OH 337198.
z: Blended with CH_3_OH 7_K_-6_K_ band.
aa: SO 219949 Slightly blended with SO_2_ 222689.
ab: SO_2_ 254280 blended with SO_2_ 254283 and ^34^SO_2_ 254278.
ac: SO_2_ 258667 blended with CH_3_OCH_3_ 261245/46/48/50.
ad: CH_3_OH 338615 blended with SO_2_ 338611 and SO_2_ 335773.
ae: CH_3_OH 338615 blended with SO_2_ 338611.
af: SO_2_ 346652 blended with CH_3_OH 349845.
ag: SO_2_ 363925 blended with CH_3_OH 361236.
ah: ^34^SO_2_ 243935 blended with CH_3_OCH_3_ 240978/82/85/89.
ai: ^34^SO_2_ 260327 blended with CH_3_OCH_3_ 26027/29/31.
aj: ^34^SO_2_ 342231 blended with ^34^SO_2_ 345678.
ak: ^34^SO_2_ 348117 blended with ^34^SO_2_ 345519.
al: ^34^SO_2_ 358988 blended with ^34^SO_2_ 355920.
am: ^34^SO_2_ 358988 blended with DCN 5--4 362046.
an: HCN {upsilon}_2_ 356255.6 blended with ^34^SO_2_ 359651.
ao: Blended with H_2_^13^CO 343325.
ap: H_2_CS 343408 blended with H_2_CS 343412.
aq: OCS 30-29 blended with CH_3_OH 364746 and CH_3_OH 364757.
ar: Blended with CH_3_CN 14_5_--13_5_ and CH_3_OH 257402.
as: HCS^+^ 8--7 blended with CH_3_OCHO 344539.
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Byte-by-byte Description of file: table8 table9
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Bytes Format Units Label Explanations
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1- 8 F8.1 MHz nu Frequency
10- 30 A21 --- NJ Transition designation
33- 36 F4.2 K TMB Temperature
38 A1 --- n_TMB Note (1)
40- 43 F4.2 km/s DV {DELTA}V
45- 49 F5.2 K.km/s W Integrated intensity
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Note (1): 1: On edge of spectrum
2: Bad base line
3: CH_3_OH 360849 slightly blended with H_2_CO 364289
a: Blended with ^34^SO 337582
b: Not a certain detection
c: CH_3_OH 338615 blended with SO_2_ 338611
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Byte-by-byte Description of file: table10
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Bytes Format Units Label Explanations
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1 I1 --- nut [0/2] Quantum number of the torsional mode
3- 10 F8.1 MHz nu Frequency
12- 50 A39 --- NJ Transition designation
52 A1 --- l_TMB Limit flag on TMB (1)
53- 57 F5.3 K TMB ? Temperature
59 A1 --- n_TMB Note (2)
61- 65 F5.2 km/s DV ? {DELTA}V
68- 72 F5.2 K.km/s W ? Integrated intensity
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Note (1): All upper limits are 2 times the rms noise in one resolution element
(generally two channels)
Note (2): 1: Strange profile
2: On edge of spectrum
a: Blended with ^13^CO 2--1
b: CH_3_OH 241791 blended with CH_3_OH 244330
c: CH_3_OH 241829 blended with CH_3_CN 239096
d: CH_3_OH 241904 blended with CH_3_CN 239022 and CH_3_OCH_3_ 239020/1
e: CH_3_OH 241590 blended with CH_3_OH 244338 and CH_3_OH 244330
f: CH_3_OH 257402 blended with CH3CN 257403 and SiO 6-5
g: CH_3_OH 260381 blended with CH_3_OCHO 260384
h: CH_3_OH 337135 blended with CN 340261
i: CH_3_OH 338615 blended with SO_2_ 338611
j: CH_3_OH 340141 blended with CH_3_OCHO 343435/43
k: CH_3_OH 360849 blended with H_2_CO 364289
l: CH_3_OH 334426 blended with CH_3_OH 337312
m: CH_3_OH 337295 blended with CH_3_OH 337297
n: CH_3_OH 337707 blended with CH_3_OCH_3_ 337708/12
o: CH_3_OH 349845 blended with SO_2_ 346652
p: CH_3_OH 359676 blended with H_2_CO 362735
q: CH_3_OH 361237 blended with SO_2_ 363890
r: CH_3_OH 361852 and CH_3_OH 364508 blended with
CH_3_OCH_3_ 361863 and CH_3_OCH_3_ 361871/4/7
s: CH_3_OH 364757 blended with CH_3_OH 364746 and OCS 30-29
t: CH_3_OH 337198 blended with ^33^SO 337198
u: CH_3_OH 337252 blended with CH_3_OH 340141
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Byte-by-byte Description of file: table11
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Bytes Format Units Label Explanations
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1- 20 A20 MHz nu Frequency
22- 44 A23 --- Jk J_k_0_,k_p__ transition designation
46 A1 --- l_TMB Limit flag on TMB
47- 50 F4.2 K TMB ? Temperature
52 A1 --- n_TMB Note (1)
54- 58 F5.2 km/s DV ? {DELTA}V
60- 64 F5.2 K.km/s W ? Integrated intensity
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Note (1): 1: On edge of spectrum
2: Bad base line
a: CH_3_OCH_3_ 239020/1 blended with CH_3_OH 241904 and CH_3_CN 239022
b: CH_3_OCH_3_ 241523/28/30 blended with CH_3_OCHO 244594
c: CH_3_OCH_3_ 241635/7/8 may be AOS spike
d: CH_3_OCH_3_ 244503/08/12 blended with SO_2_ 241615
e: CH_3_OCH_3_ 260400/1/3/5 thoroughly blended with CH_3_CN257522 and
CH_3_OCHO 260392/404
f: CH_3_OCH_3_ 260754/56/58/61 blended with HC^15^N 3--2
g: CH_3_OCH_3_ 261145/47/48/50 blended with CH_3_OCHO 261148
h: CH_3_OCH_3_ 261245/46/48/50 blended with SO_2_ 258666
i: CH_3_OCH_3_ 339491 blended with CN 339493
j: CH_3_OCH_3_ 342608 blended with ^34^SO_2_ 345285
k: CH_3_OCH_3_ 356705/12/16/23/24 on wing of HCO^+^ 4--3
l: CH_3_OCH_3_ 361863 and CH_3_OCH_3_ 361871/4/7 blended with
CH_3_OH 361852 and CH_3_OH 364508.
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Byte-by-byte Description of file: table12
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Bytes Format Units Label Explanations
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1- 25 A25 MHz nu Frequency
27- 39 A13 --- J Transition designation
41 A1 --- l_TMB Limit flag on TMB
42- 46 F5.3 K TMB ? Temperature
48 A1 --- n_TMB Note (1)
50- 54 F5.2 km/s DV ? {DELTA}V
57- 61 F5.2 K.km/s W ? Integrated intensity
63 A1 --- n_W Note (1)
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Note (1): 1: On edge of spectrum
2: Bad base line
a: CH_3_OCHO 225900 in wing HDO 225896.
b: CH_3_OCHO 258476/82/99 blended with CH_3_OCHO 261433/6 and
CH_3_OCHO 258490/496/502/508/518/523.
c: CH_3_OCHO 260384/392/404/415 thoroughly blended with
CH_3_CN 257507/22/27 and CH_3_OCH_3_ 260400/1/3/5.
d: CH_3_OCHO 261148 blended with CH_3_OCH_3_ 261145/47/48/50.
e: CH_3_OCHO 334851 blended with CH_3_OH 337546.
f: CH_3_OCHO 334877 blended with CH_3_OH 337519.
g: CH_3_OCHO 338338 and CH_3_OCHO 338355 in wings CH_3_OH 338344.
h: CH_3_OCHO 338396 and CH_3_OCHO 338414 in wings CH_3_OH 338404/408.
i: CH_3_OCHO 343435/43 blended with CH_3_OH 340141.
j: On wing OCS 28--27.
k: CH_3_OCHO 344322/36/47 blended with SO 344310 and H^13^CO^+^ 4--3.
l: CH_3_OCHO 344539 blended with HCS^+^ 8--7.
m: CH_3_OCHO 345090 in wing H_2_CS 348531.
n: CH_3_OCHO 358591 in wing CH_3_OH 358605.
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Acknowledgements: Frank Helmich <fph@deuterium.strw.LeidenUniv.nl>
References:
Helmich et al., Paper I. 1994A&A...283..626H
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(End) Patricia Bauer [CDS] 30-Jul-1997