J/ApJ/652/1230 H2CO absorption toward Galactic anticenter (Rodriguez+, 2006)
Anomalous H2CO absorption toward the Galactic anticenter:
a blind search for dense molecular clouds.
Rodriguez M.I., Allen R.J., Loinard L., Wiklind T.
<Astrophys. J., 652, 1230-1239 (2006)>
=2006ApJ...652.1230R 2006ApJ...652.1230R
ADC_Keywords: Molecular clouds ; Interstellar medium
Keywords: galaxies: ISM - ISM: clouds - ISM: molecules - radio lines: ISM -
stars: formation
Abstract:
We have carried out a blind search in the general direction of the
Galactic anticenter for absorption of the cosmic microwave background
(CMB) radiation near 4.83GHz by molecular clouds containing gaseous
ortho-formaldehyde (H2CO). The observations were done using the 25m
radio telescope at Onsala in Sweden and covered strips in Galactic
latitude, 1°≤b≤+1°, at several longitudes in the region
170°≤l≤190°. Spectra were obtained in these strips with a
grid spacing corresponding to the telescope resolution of 10'. We have
detected H2CO CMB absorption at 10% of the survey pointings.
Description:
The observations were obtained during two sessions, the first in 2004
September-October and the second in 2005 May, with the 25m Onsala
radio telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 56 113 Profile moments for each position of Fig. 2
table4.dat 56 150 Moments for each survey position of Fig. 3
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See also:
J/ApJS/145/355 : Interstellar NaI lines toward anticenter (Genova+, 2003)
Byte-by-byte Description of file: table[34].dat
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Bytes Format Units Label Explanations
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1- 3 I3 arcmin oGLON Galactic longitude offset (1)
5- 7 I3 arcmin oGLAT Galactic latitude offset (1)
9 A1 --- l_I(H2CO) The 3σ upper limit on I(H2CO)
10- 14 F5.1 100K.km/s I(H2CO) ? The H2CO intensity
16- 18 F3.1 100K.km/s e_I(H2CO) ? Uncertainty in I(H2CO)
20 A1 --- f_I(H2CO) [n] No reliable fit on I(H2CO)
22- 26 F5.1 km/s V(H2CO) ? Average H2CO line width
28- 30 F3.1 km/s e_V(H2CO) ? Uncertainty in V(H2CO)
32 A1 --- f_V(H2CO) [n] No reliable fit on V(H2CO)
34 A1 --- l_I(CO) The 3σ upper limit on I(CO)
35- 38 F4.1 K.km/s I(CO) The CO intensity
40- 42 F3.1 K.km/s e_I(CO) ? Uncertainty in I(CO)
44- 48 F5.1 km/s V(CO) ? Average CO line width
50- 52 F3.1 km/s e_V(CO) ? Uncertainty in V(CO)
54 A1 --- f_V(CO) [n] No reliable fit on V(CO)
56 A1 --- Fig7 [Y] Included in Figure 7?
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Note (1): Offset from direction:
GLON=182°, GLAT=0° for table3
GLON=190°, GLAT=0° for table4
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 29-Jul-2008