2002A&A...389..446D


Query : 2002A&A...389..446D

2002A&A...389..446D - Astronomy and Astrophysics, volume 389, 446-463 (2002/7-2)

Chemistry as a probe of the structures and evolution of massive star-forming regions.

DOTY S.D., VAN DISHOECK E.F., VAN DER TAK F.F.S. and BOONMAN A.M.S.

Abstract (from CDS):

We present detailed thermal and gas-phase chemical models for the envelope of the massive star-forming region AFGL 2591. By considering both time- and space-dependent chemistry, these models are used to study both the physical structure proposed by van der Tak et al. (1999ApJ...522..991V, 2000ApJ...537..283V), as well as the chemical evolution of this region. The model predictions are compared with observed abundances and column densities for 29 species. The observational data cover a wide range of physical conditions within the source, but significantly probe the inner regions where interesting high-temperature chemistry may be occurring. Taking appropriate care when comparing models with both emission and absorption measurements, we find that the majority of the chemical structure can be well-explained. In particular, we find that the nitrogen and hydrocarbon chemistry can be significantly affected by temperature, with the possibility of high-temperature pathways to HCN. While we cannot determine the sulphur reservoir, the observations can be explained by models with the majority of the sulphur in CS in the cold gas, SO2 in the warm gas, and atomic sulphur in the warmest gas. Because the model overpredicts CO2 by a factor of 40, various high-temperature destruction mechanisms are explored, including impulsive heating events. The observed abundances of ions such as HCO+ and N2H+ and the cold gas-phase production of HCN constrain the cosmic-ray ionization rate to ∼5.6x10–17s–1, to within a factor of three. Finally, we find that the model and observations can simultaneously agree at a reasonable level and often to within a factor of three for 7x103≤t(yrs)≤5x104, with a strong preference for t∼3x104yrs since the collapse and formation of the central luminosity source.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: individual: AFGL 2591 - 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 - 2022
#notes
1 RAFGL 2591 Y*O 20 29 24.86688 +40 11 19.4100           ~ 595 0

Query : 2002A&A...389..446D

Basic data :
RAFGL 2591 -- Young Stellar Object
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:
Rad (), IR (2MASS,AKARI,...), smm (BLAST,JCMTSE,...), Y*O (2014MNRAS), mm (BGPS,[SSS2011]), Mas (2011MNRAS,[HLB98]), HII (2011MNRAS), out (2015MNRAS)
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) :
20 29 24.86688 +40 11 19.4100 (Near-IR) [ 90 80 2 ] C 2003yCat.2246....0C
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) :
20 27 35.94951 +40 01 14.5577 [ 90 80 2 ]
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) :
078.88669621 +00.70879129 [ 90 80 2 ]
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):
0.51 0.40 113 (mm) D 2010ApJS..188..123R
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (2) :
H 10.771 [0.042] E 2003yCat.2246....0C
K 6.575 [0.016] C 2003yCat.2246....0C
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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sedIcon
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!).
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The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (24) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

2MASS J20292486+4011194 JCMTSF J202924.5+401120 RAFGL 19 [MJF2000] A
AKARI-IRC-V1 J2029249+401118 MSX6C G078.8867+00.7087 WISE J202925.03+401120.3 [RAB2011b] C1
BGPS G078.888+00.709 NAME AFGL 2591 N3 [BE83] IR 078.89+00.71 [SSS2011] BGPS G78.889+0.711
BLAST J202925+401118 NAME AFGL 2591 IRS [C84c] 3 [TCC2003] AFGL 2591 VLA 3
IRAS 20275+4001 NAME NIRS 1 [ERG2015] 7226 [TFT95b] Rad 202735.975+400114.709
JCMTSE J202924.5+401120 RAFGL 2591 [HLB98] Onsala 135 [TGJ91] AFGL 2591 NIRS 1

References (595 between 1850 and 2022) (Total 595)
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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Collections of Measurements


distance : 1   

   

Observing logs


herschel : 78    ISO : 25   

   


External archives :

Data at NED - NASA/IPAC Extragalactic Database : RAFGL 2591

Link by name to the catalogue in VizieR :

2MASS J20292486+4011194 AKARI-IRC-V1 J2029249+401118 IRAS 20275+4001 MSX6C G078.8867+00.7087 RAFGL 2591
RAFGL 19 WISE J202925.03+401120.3

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2022.05.21-23:31:53

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