J/A+A/453/911 VLA and IR observations of the S235A-B region (Felli+, 2006)
New signposts of massive star formation in the S235A-B region.
Felli M., Massi F., Robberto M., Cesaroni R.
<Astron. Astrophys., 453, 911-922 (2006)>
=2006A&A...453..911F 2006A&A...453..911F
ADC_Keywords: H II regions ; Radio sources ; Infrared sources
Keywords: stars: formation - ISM: individual objects: S235A-B -
ISM: jets and outflows - radio continuum: ISM - masers
Abstract:
We report on new aspects of the star-forming region S235AB revealed
through high-resolution observations at radio and mid-infrared
wavelengths.
Using the Very Large Array, we carried out sensitive observations of
S235AB in the cm continuum (6, 3.6, 1.3, and 0.7) and in the 22GHz
water maser line. These were complemented with Spitzer Space Telescope
Infrared Array Camera archive data to clarify the correspondence
between radio and IR sources. We made also use of newly presented data
from the Medicina water maser patrol, started in 1987, to study the
variability of the water masers found in the region.
Description:
The observations carried out with the VLA of the National Radio
Astronomy Observatory (NRAO) were made with the VLA in the C
configuration on February 26 and on March 7, 2004.
The single-dish Medicina radio telescope (HPBW 1.9') observations are
part of a monitoring project of a large sample of water masers.
Spitzer-IRAC observations of a large area around the S235A-B region in
the four wavelengths (3.6, 4.5, 5.8, and 8µm) were extracted from
the Spitzer public archive. The observations are part of the GTO
program 201 "The Role of Photodissociation Regions in High Mass Star
Formation" (Principal Investigator G. Fazio).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 66 15 MIR fluxes for the Spitzer-IRAC sources towards
the mm core
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Sequential number, [FMR2006b] IR NN in Simbad
3 A1 --- n_Seq [a] N-E of a close by source only visible in
the 5.8um band
5- 14 A10 --- OName Other name
16- 17 I2 h RAh Right ascension (J2000)
19- 20 I2 min RAm Right ascension (J2000)
22- 25 F4.1 s RAs Right ascension (J2000)
27 A1 --- DE- Declination sign (J2000)
28- 29 I2 deg DEd Declination (J2000)
31- 32 I2 arcmin DEm Declination (J2000)
34- 35 I2 arcsec DEs Declination (J2000)
37 A1 --- l_F3.6um Limit flag on F3.6um
38- 41 F4.1 mJy F3.6um Flux density at 3.6um
43- 45 F3.1 mJy e_F3.6um ? rms uncertainty on F3.6um
47- 50 F4.1 mJy F4.5um Flux density at 4.5um
52- 54 F3.1 mJy e_F4.5um rms uncertainty on F4.5um
56 A1 --- l_F5.8um Limit flag on F5.8um
57- 58 I2 mJy F5.8um Flux density at 5.8um
60 I1 mJy e_F5.8um ? rms uncertainty on F5.8um
62 A1 --- l_F8.0um Limit flag on F8.0um
63- 64 I2 mJy F8.0um Flux density at 8.0um
66 I1 mJy e_F8.0um ? rms uncertainty on F8.0um
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Table 3: Radio continuum fluxes. Upper limits are 3sigma noise levels.
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Source Position Flux density (in mJy)
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RA (J2000) DE S0.7cm S1.3cm S3.6cm S6cm
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S235A 05 40 52.70 35 42 21 114.±3. a 172.±1 248.±2 257.±7
VLA-1 05 40 53.60 35 41 43 0.59±0.08 0.44±0.03 0.39±0.08 <0.27
VLA-2 05 40 52.40 35 41 30 0.48±0.08 0.47±0.03 <0.24 <0.27
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Note: a: Corrected for primary beam attenuation.
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Table 45: Water masers: fluxes, positions and line luminosities
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Name RA (J2000) DE L(H2O) ΔVlsr Vlsr Snu
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H2O/1 05 40 53.27 +35 41 50.0 3.1 9 to -1 7 1.20
3 0.50
H2O/2 05 40 53.63 +35 41 43.0 3.3 -17 to -30 -18 0.16
-25 0.52
-29 1.66
H2O/3 05 40 53.38 +35 41 48.6 4.1 -55 to -71 -58 0.37
-62 0.23
-64 0.22
-68 1.44
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Jan-2007