J/A+A/308/573 Ammonia on YSOs IRAS sources (Molinari+ 1996)
A search for precursors of ultracompact HII regions in a sample of luminous
IRAS sources. I. Association with ammonia cores.
Molinari S., Brand J., Cesaroni R., Palla F.
<Astron. Astrophys. 308, 573 (1996)>
=1996A&A...308..573M 1996A&A...308..573M (SIMBAD/NED BibCode)
ADC_Keywords: YSOs ; Radio lines
Keywords: stars: formation - stars: pre-main sequence -
stars: circumstellar matter - radio lines: ISM -
ISM: HII regions; molecules
Description:
We present observations of NH3 (1,1) and (2,2) lines in two
flux-limited samples of IRAS sources selected according to colour
criteria which should result in a high fraction of Young Stellar
Objects. The first sample contains sources (named 'LOW') whose
evolutionary status is essentially unknown, while the second sample
contains sources (named 'HIGH') possibly associated with ultracompact
HII regions, the distinction being based on the IRAS [25-12] colour.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 124 163 General informations about observed sources.
table2.dat 95 102 Ammonia line parameters and deduced physical
quantities
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See also:
J/A+A/336/339 : VLA observations. Paper II. (Molinari+ 1998)
J/ApJS/125/161 : A database of dense cores mapped in ammonia (Jijina+, 1999)
Byte-by-byte description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Mol Running number
6- 16 A11 --- IRAS IRAS name
18 A1 --- Type [HL] Source type (H --> HIGH; L --> LOW)
19 A1 --- n_Type [^] A '^' means a 12um flux upper limit for
that source
22- 23 I2 h RAh 1950 hours of Right Ascension
25- 26 I2 min RAm 1950 minutes of Right Ascension
28- 31 F4.1 s RAs 1950 seconds of Right Ascension
34 A1 --- DE- sign for declination
35- 36 I2 deg DEd 1950 degrees of Declination
38- 39 I2 arcmin DEm 1950 arcmin of Declination
41- 44 F4.1 arcsec DEs 1950 arcsec of Declination
47- 53 F7.3 deg GLON Galactic longitude
56- 61 F6.3 deg GLAT Galactic latitude
65- 69 F5.2 kpc Dist ? Distance from observer
70 A1 --- n_Dist [ab] Note on distance (1)
72- 79 E8.2 solLum Lum ? Bolometric luminosity
82 A1 --- NH3det Y/N flag indicating detection in ammonia
85 A1 --- H2Odet Y/N flag indicating detection in water maser
88-123 A36 --- IDent Other identification from the literature
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Note (1): 'a' means that the distance ambiguity has been resolved
'b' means the the distance of the tangent point has been assumed
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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- 3 I3 --- Mol Running number (as in Table1.dat)
5- 9 F5.2 K T11 Antenna temperature for line (J,K)=(1,1)
11-12 I2 % e_T11 Percentage uncertainty on T11
14-19 F6.1 km/s V11 (1,1) center line velocity
21-22 I2 % e_V11 Percentage uncertainty on V11
25-28 F4.2 km/s W11 (1,1) FWHM
30-31 I2 % e_W11 Percentage uncertainty on W11
34-38 F5.2 K T22 ? Antenna temperature for line (J,K)=(2,2)
40-41 I2 % e_T22 ? Percentage uncertainty on T22
43-48 F6.1 km/s V22 ? (2,2) center line velocity
50-51 I2 % e_V22 ? Percentage uncertainty on V22
54-57 F4.2 km/s W22 ? (2,2) FWHM
59-60 I2 % e_W22 ? Percentage uncertainty on W22
63-67 F5.2 K Tkin ? Ammonia kinetic temperature
68 A1 --- l_Tkin [ :] flag indicating that Tkin is a limit
69-70 I2 % e_Tkin ? Percentage uncertainty on Tkin
72-80 E9.2 cm-2 Ncol ? Ammonia column density
81 A1 --- l_Ncol [ :] flag indicating that Ncol is a limit
82-83 I2 % e_Ncol ? Percentage uncertainty on Ncol
86 A1 --- l_Tau [ <] indicates if the Tau value is upper limit
87-90 F4.2 --- Tau ? Optical depth of (1,1) line
92-93 I2 % e_Tau ? Percentage uncertainty on Tau
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Courtesy: Sergio Molinari,
(End) Patricia Bauer [CDS] 16-Apr-1996