2006A&A...453..969F


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.08CET18:50:53

2006A&A...453..969F - Astronomy and Astrophysics, volume 453, 969-978 (2006/7-3)

Spitzer/IRAC and ISOCAM/CVF insights on the origin of the near to mid-IR Galactic diffuse emission.

FLAGEY N., BOULANGER F., VERSTRAETE L., MIVILLE-DESCHENES M.A., NORIEGA-CRESPO A. and REACH W.T.

Abstract (from CDS):

Spitzer/IRAC images of extended emission provide a new insight on the nature of small dust particles in the Galactic diffuse interstellar medium. We measure IRAC colors of extended emission in several fields covering a range of Galactic latitudes and longitudes outside of star forming regions. We determine the nature of the Galactic diffuse emission in Spitzer/IRAC images by combining them with spectroscopic data. We show that PAH features make the emission in the IRAC 5.8 and 8.0µm channels, whereas the 3.3µm feature represents only 20 to 50% of the IRAC 3.6µm channel. A NIR continuum is necessary to account for IRAC 4.5µm emission and the remaining fraction of the IRAC 3.6µm emission. This continuum cannot be accounted by scattered light. It represents 9% of the total power absorbed by PAHs and 120% of the interstellar UV photon flux. The 3.3µm feature is observed to vary from field-to-field with respect to the IRAC 8.0µm channel. The continuum and 3.3µm feature intensities are not correlated. We present model calculations which relate our measurements of the PAHs spectral energy distribution to the particles size and ionization state. Cation and neutral PAHs emission properties are inferred empirically from NGC 7023 observations. PAHs caracteristics are best constrained in a line of sight towards the inner Galaxy, dominated by the Cold Neutral Medium phase: we find that the PAH cation fraction is about 50% and that their mean size is about 60 carbon atoms. A significant field-to-field dispersion in the PAH mean size, from 40 to 80 carbon atoms, is necessary to account for the observed variations in the 3.3µm feature intensity relative to the IRAC 8.0µm flux. However, one cannot be secure about the feature interpretation as long as the continuum origin remains unclear. The continuum and 3.3µm feature emission process could be the same even if they do not share carriers.

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Journal keyword(s): dust, extinction - ISM: clouds - Galaxy: general - infrared: ISM

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 - 2021
#notes
1 NGC 7023 RNe 21 01 36.9 +68 09 48           ~ 642 0

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2021.03.08CET18:50:53

Available data : Basic data  •  Identifiers  •  Plot & images  •  Bibliography  •  Measurements  •  External archives  •  Notes  •  Annotations


Basic data :
NGC 7023 -- Reflection Nebula
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:
* (), Cl* (C,Cl,...), IR (IRAS,PSCz,...), OpC (OCISM,OCl), RNe ([RK68]), HII (LBN), ISM (GN), V* (AAVSO), UV ([SPB96])
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) :
21 01 36.9 +68 09 48 [ ] 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) :
21 00 59.7 +67 57 55 [ ]
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) :
104.0616 +14.1926 [ ]
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: 14
Display criteria :

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Identifiers (20) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

NGC 7023 IRAS F20599+6755 NAME IRIS Nebula RAFGL 2695
C 2059+679 IRAS F21009+6758 OCISM 50 [BDB2003] G104.06+14.19
Cl VDB 139 IRAS 21009+6758 OCl 235 [RK68] 105
GN 21.01.0 LBN 104.08+14.21 PSCz P20599+6755 [SPB96] 2161
IRAS 20599+6755 LBN 487 PSCz P21009+6758 AAVSO 2044+67

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References (642 between 1850 and 2021) (Total 642)
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


ISO : 236    herschel : 52   

   


External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : NGC 7023

Link by name to the catalogue in VizieR :

NGC 7023 IRAS 20599+6755 IRAS F20599+6755 IRAS F21009+6758 IRAS 21009+6758
RAFGL 2695

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2021.03.08-18:50:53

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