J/A+AS/124/205 W3 star-forming region 345 GHz survey (Helmich+ 1997)
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 1997A&AS..124..205H (SIMBAD/NED BibCode)
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(H2O). 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 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, ≥106cm-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(H2O). The chemical differences between the three
sources are very striking: silicon- and sulfur-bearing molecules such
as SiO and SO2 are prominent toward IRS5, whereas organic molecules
like CH3OH, CH3OCH3 and CH3OCHO are at least an order of
magnitude more abundant toward W 3(H2O). 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(H2O) somewhat older and IRS4, although still enigmatic, the
oldest.
Objects:
----------------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------------
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)
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table7 141 276 *Gaussian fit parameters
table8 49 22 CH3OH Gaussian fit parameters W 3 IRS4
table9 49 13 CH3OH Gaussian fit parameters W 3 IRS5
table10 75 126 CH3OH Gaussian fit parameters W 3(H2O)
table11 64 38 CH3OCH3 Gaussian fit parameters W 3(H2O)
table12 77 51 CH3OCHO Gaussian fit parameters W 3(H2O)
tables.tex 78 1310 LaTeX version of the tables
--------------------------------------------------------------------------------
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(H2O) 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(H2O) respectively in the 230GHz region and 550, 940 and 360K.km/s
in the 345GHz window.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table7
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
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
--------------------------------------------------------------------------------
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 CH3OCH3 339491.
b: Blended with C34S 7--6.
c: H13CN 4--3 always blended with SO2 345338.
d: HC15N 3--2 blended with CH3OCH3 260754/56/58/61.
e: HNC 4--3 blended with SO2 359770.
f: HN13C 3--2 blended with SO2 258666.
g: Blended with CH3OCH3 358447-358456.
h: In wing SO2 351257.
i: H2CS 244047 blended with HNCO 240875/6.
j: CH3CCH 358818 blended with CH3CCH 358811.
k: Uncertain, could also be a base-line ripple
l: H2CO 542-441 and 541-440 are always blended.
m: H2CO 364289 blended with CH3OH 360849.
n: Blended with H2CS and CN.
o: H213CO 354898 blended with SO2 358013.
p: H213CO 355041 blended with SO2 355045.
q: CH3CN 257507/22/27 blended with CH3OCHO 260384/392 /404/415.
r: CH3CN 257522 blended with CH3OCH3 260400/1/3/5
s: Blended with CCH 349337/8.
t: CH3CN 349446 blended with CH3CN 349453.
u: Blended with CH3OH 243915.
v: SO 346528 always blended with SO2 346523.
w: 34SO 337582 blended with CH3OH 337581.
x: Large frequency error in line catalogues.
y: Four hyperfine components of 33SO blended with CH3OH 337198.
z: Blended with CH3OH 7K-6K band.
aa: SO 219949 Slightly blended with SO2 222689.
ab: SO2 254280 blended with SO2 254283 and 34SO2 254278.
ac: SO2 258667 blended with CH3OCH3 261245/46/48/50.
ad: CH3OH 338615 blended with SO2 338611 and SO2 335773.
ae: CH3OH 338615 blended with SO2 338611.
af: SO2 346652 blended with CH3OH 349845.
ag: SO2 363925 blended with CH3OH 361236.
ah: 34SO2 243935 blended with CH3OCH3 240978/82/85/89.
ai: 34SO2 260327 blended with CH3OCH3 26027/29/31.
aj: 34SO2 342231 blended with 34SO2 345678.
ak: 34SO2 348117 blended with 34SO2 345519.
al: 34SO2 358988 blended with 34SO2 355920.
am: 34SO2 358988 blended with DCN 5--4 362046.
an: HCN υ2 356255.6 blended with 34SO2 359651.
ao: Blended with H213CO 343325.
ap: H2CS 343408 blended with H2CS 343412.
aq: OCS 30-29 blended with CH3OH 364746 and CH3OH 364757.
ar: Blended with CH3CN 145--135 and CH3OH 257402.
as: HCS+ 8--7 blended with CH3OCHO 344539.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table8 table9
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
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
--------------------------------------------------------------------------------
Note (1): 1: On edge of spectrum
2: Bad base line
3: CH3OH 360849 slightly blended with H2CO 364289
a: Blended with 34SO 337582
b: Not a certain detection
c: CH3OH 338615 blended with SO2 338611
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table10
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
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
--------------------------------------------------------------------------------
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 13CO 2--1
b: CH3OH 241791 blended with CH3OH 244330
c: CH3OH 241829 blended with CH3CN 239096
d: CH3OH 241904 blended with CH3CN 239022 and CH3OCH3 239020/1
e: CH3OH 241590 blended with CH3OH 244338 and CH3OH 244330
f: CH3OH 257402 blended with CH3CN 257403 and SiO 6-5
g: CH3OH 260381 blended with CH3OCHO 260384
h: CH3OH 337135 blended with CN 340261
i: CH3OH 338615 blended with SO2 338611
j: CH3OH 340141 blended with CH3OCHO 343435/43
k: CH3OH 360849 blended with H2CO 364289
l: CH3OH 334426 blended with CH3OH 337312
m: CH3OH 337295 blended with CH3OH 337297
n: CH3OH 337707 blended with CH3OCH3 337708/12
o: CH3OH 349845 blended with SO2 346652
p: CH3OH 359676 blended with H2CO 362735
q: CH3OH 361237 blended with SO2 363890
r: CH3OH 361852 and CH3OH 364508 blended with
CH3OCH3 361863 and CH3OCH3 361871/4/7
s: CH3OH 364757 blended with CH3OH 364746 and OCS 30-29
t: CH3OH 337198 blended with 33SO 337198
u: CH3OH 337252 blended with CH3OH 340141
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table11
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 20 A20 MHz nu Frequency
22- 44 A23 --- Jk Jk0,kp 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
--------------------------------------------------------------------------------
Note (1): 1: On edge of spectrum
2: Bad base line
a: CH3OCH3 239020/1 blended with CH3OH 241904 and CH3CN 239022
b: CH3OCH3 241523/28/30 blended with CH3OCHO 244594
c: CH3OCH3 241635/7/8 may be AOS spike
d: CH3OCH3 244503/08/12 blended with SO2 241615
e: CH3OCH3 260400/1/3/5 thoroughly blended with CH3CN257522 and
CH3OCHO 260392/404
f: CH3OCH3 260754/56/58/61 blended with HC15N 3--2
g: CH3OCH3 261145/47/48/50 blended with CH3OCHO 261148
h: CH3OCH3 261245/46/48/50 blended with SO2 258666
i: CH3OCH3 339491 blended with CN 339493
j: CH3OCH3 342608 blended with 34SO2 345285
k: CH3OCH3 356705/12/16/23/24 on wing of HCO+ 4--3
l: CH3OCH3 361863 and CH3OCH3 361871/4/7 blended with
CH3OH 361852 and CH3OH 364508.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table12
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
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)
--------------------------------------------------------------------------------
Note (1): 1: On edge of spectrum
2: Bad base line
a: CH3OCHO 225900 in wing HDO 225896.
b: CH3OCHO 258476/82/99 blended with CH3OCHO 261433/6 and
CH3OCHO 258490/496/502/508/518/523.
c: CH3OCHO 260384/392/404/415 thoroughly blended with
CH3CN 257507/22/27 and CH3OCH3 260400/1/3/5.
d: CH3OCHO 261148 blended with CH3OCH3 261145/47/48/50.
e: CH3OCHO 334851 blended with CH3OH 337546.
f: CH3OCHO 334877 blended with CH3OH 337519.
g: CH3OCHO 338338 and CH3OCHO 338355 in wings CH3OH 338344.
h: CH3OCHO 338396 and CH3OCHO 338414 in wings CH3OH 338404/408.
i: CH3OCHO 343435/43 blended with CH3OH 340141.
j: On wing OCS 28--27.
k: CH3OCHO 344322/36/47 blended with SO 344310 and H13CO+ 4--3.
l: CH3OCHO 344539 blended with HCS+ 8--7.
m: CH3OCHO 345090 in wing H2CS 348531.
n: CH3OCHO 358591 in wing CH3OH 358605.
--------------------------------------------------------------------------------
Acknowledgements: Frank Helmich
References:
Helmich et al., Paper I. 1994A&A...283..626H 1994A&A...283..626H
(End) Patricia Bauer [CDS] 30-Jul-1997