2010A&A...521L..31V

Query : 2010A&A...521L..31V

2010A&A...521L..31V - Astronomy and Astrophysics, volume 521, L31-31 (2010/10-1)

Ortho-to-para ratio of interstellar heavy water.

VASTEL C., CECCARELLI C., CAUX E., COUTENS A., CERNICHARO J., BOTTINELLI S., DEMYK K., FAURE A., WIESENFELD L., SCRIBANO Y., BACMANN A., HILY-BLANT P., MARET S., WALTERS A., BERGIN E.A., BLAKE G.A., CASTETS A., CRIMIER N., DOMINIK C., ENCRENAZ P., GERIN M., HENNEBELLE P., KAHANE C., KLOTZ A., MELNICK G., PAGANI L., PARISE B., SCHILKE P., WAKELAM V., BAUDRY A., BELL T., BENEDETTINI M., BOOGERT A., CABRIT S., CASELLI P., CODELLA C., COMITO C., FALGARONE E., FUENTE A., GOLDSMITH P.F., HELMICH F., HENNING T., HERBST E., JACQ T., KAMA M., LANGER W., LEFLOCH B., LIS D., LORD S., LORENZANI A., NEUFELD D., NISINI B., PACHECO S., PEARSON J., PHILLIPS T., SALEZ M., SARACENO P., SCHUSTER K., TIELENS X., VAN DER TAK F., VAN DER WIEL M.H.D., VITI S., WYROWSKI F., YORKE H., CAIS P., KRIEG J.-M., OLBERG M. and RAVERA L.

Abstract (from CDS):

Despite the low elemental deuterium abundance in the Galaxy, enhanced molecular D/H ratios have been found in the environments of low-mass star-forming regions, and in particular the Class 0 protostar IRAS 16293-2422. The CHESS (Chemical HErschel Surveys of Star forming regions) key program aims to study the molecular complexity of the interstellar medium. The high sensitivity and spectral resolution of the Herschel/HIFI instrument provide a unique opportunity to observe the fundamental 11,1-00,0 transition of the ortho-D2O molecule, which is inaccessible from the ground, and determine the ortho-to-para D2O ratio. We detected the fundamental transition of the ortho-D2O molecule at 607.35GHz towards IRAS 16293-2422. The line is seen in absorption with a line opacity of 0.62±0.11 (1σ). From the previous ground-based observations of the fundamental 11,0-10,1 transition of para-D2O seen in absorption at 316.80GHz, we estimate a line opacity of 0.26±0.05 (1σ). We show that the observed absorption is caused by the cold gas in the envelope of the protostar. Using these new observations, we estimate for the first time the ortho-to-para D2O ratio to be lower than 2.6 at a 3σ level of uncertainty, which should be compared with the thermal equilibrium value of 2:1.

Abstract Copyright: ∼

Journal keyword(s): astrochemistry - ISM: molecules - submillimeter: ISM - ISM: abundances - molecular processes - line: identification

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 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1252 1

Query : 2010A&A...521L..31V

Basic data :
IRAS 16293-2422 -- Dense Core
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: 		smm (2008ApJ,JCMTLSG,...), IR (2013ApJS,HGBS,...), MIR (SSTc2d,WISEA,...), Y*O (2015MNRAS,[EES2009]), Y*? (2015ApJS,[HL2013]), mm (2009ApJ,[YEE2006]), cor (2020A&A), PoC ([FST86])
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) : 		16 32 22.56 -24 28 31.8 (Infrared) [ 300 300 90 ] C 2009ApJ...692..973E
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) : 		16 29 20.71 -24 22 11.7 [ 300 300 90 ]
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) : 		353.93571 +15.84097 [ 300 300 90 ]
Syntax of angular size is : "maj-axis min-axis angle (wtype) quality bibcode"
  • maj-axis : major axis size (arc minutes)
  • min-axis : minor axis size (arc minutes)
  • angle : orientation angle (in degrees)
  • (wtype) : wavelength class for the origin of the angular size (Rad, mm, IR, Opt, UV, Xray, Gam)
  • quality : flag of quality of the angular size values ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the angular size reference
Angular size (arcmin): 		0.35 0.13 136 (FIR) C 2020A&A...638A..74L
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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within arcsec The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR.
The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!). sed-help-icon
Some important notes on this object about identifications and objects associations.
notes:

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

: 1
The count displayed here is the number of children objects.
The list obtained by clicking the button may be larger, as some children may be linked with different references or probability.

%This number is the number of distinct objets linked, by using this button, you will obtain all links (may be more than one) from that object to his children

: 2 		: 2356 Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (19) :
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HGBS J163223.1-242836 NAME IRAS 1629A WISEA J163222.60-242833.6 [HL2013] 248.09427-24.47550
IRAS 16293-2422 NAME IRAS 16293 WISE J163222.62-242833.6 [JJK2008] SMM J163223-24284
JCMTLSG J163222.6-242833 NAME rho Oph East [EDJ2009] 1008 [NWA2006] SMM 20
JCMTSE J163222.8-242837 SSTc2d J163222.6-242832 [EES2009] Oph-emb 2 [YEE2006] 37
JCMTSF J163222.8-242837 SSTc2d J163222.6-242831 [FST86] rho Oph E

References (1252 between 1850 and 2024) (Total 1252)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Observing logs


herschel : 27    ISO : 23   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : IRAS 16293-2422

Link by name to the catalogue in VizieR :

IRAS 16293-2422 WISEA J163222.60-242833.6 WISE J163222.62-242833.6

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