1997A&A...323L..25C

Query : 1997A&A...323L..25C

1997A&A...323L..25C - Astronomy and Astrophysics, volume 323, L25-28 (1997/7-1)

Widespread water vapour absorption in Sgr B2.

CERNICHARO J., LIM T., COX P., GONZALEZ-ALFONSO E., CAUX E., SWINYARD B.M., MARTIN-PINTADO J., BALUTEAU J.-P. and CLEGG P.

Abstract (from CDS):

We report the discovery of widespread water vapour absorption in the 212-101 179.5µm transition toward the SgrB2 molecular cloud. The data were obtained with the Long Wavelength Spectrometer (LWS) on board the ISO satellite. A raster map centered on SgrB2 made with the LWS grating clearly shows the 179.5µm H2O line in absorption against the far-infrared continuum at all observed positions with a line absorption depth of ∼15%. The grating data are complemented with Fabry-Perot observations of the H2O 179.5 and 174.6µm lines, and the H218O 181.05µm. The transitions connecting the ground level show a broad absorption profile between -150 and 100km/s proving that water vapour is present in the molecular gas along the line of sight toward SgrB2. The H2O absorption lines probably arise in the tenuous and extended envelope of SgrB2 where collisional excitation is negligible and the excitation is mainly due to absorption of photons emitted by the dust. We derive a lower limit to the H2O abundance in SgrB2 of 10–5.

Abstract Copyright: ∼

Journal keyword(s): Line: Identification - Molecular Processes - ISM: individual objects: Sgr B2 - ISM: molecules

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2266 1

Query : 1997A&A...323L..25C

Basic data :
NAME Sgr B2 -- Molecular Cloud
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types: 		MoC (), SFR (2016MNRAS), X ([SKM2002])
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) : 		17 47 20.4 -28 23 07 [ ] D ~
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) : 		17 44 10.6 -28 22 05 [ ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) : 		000.6667 -00.0362 [ ]
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, ∼=unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz : 		V(km/s) 61.6 [~] / z(~) 0.000205 [~] / cz 61.61 [~]
   D 1973ApJ...181..781F
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Some important notes on this object about identifications and objects associations.
notes:

  • also GMC

Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1 : 1 Display criteria :

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Identifiers (3) :
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NAME Sagittarius B2 NAME Sgr B2 [SKM2002] G000.7+1

References (2266 between 1850 and 2024) (Total 2266)
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