1999A&A...344..955W

Query : 1999A&A...344..955W

1999A&A...344..955W - Astronomy and Astrophysics, volume 344, 955-964 (1999/4-3)

A molecular cloud forming in the disk-halo interface.

WEISS A., HEITHAUSEN A., HERBSTMEIER U. and MEBOLD U.

Abstract (from CDS):

We present medium and high angular resolution I and CO observations of the galactic cirrus cloud IVC 135+54-45 and compare the line emission with intensities of the IRAS 100µm and 60µm bands. Its distance above the galactic plane is about 220pc, thus well outside the scale height of normal molecular gas (≃74pc). Thus IVC 135+54-45 offers a unique possibility to study the cold interstellar medium in the transition zone between the galactic plane and the halo. We establish a linear relation between the IRAS 100µm intensities and the proton column densities in the outer part of the cloud where the H2 content is negligible. In the centre of the cloud we find two clumps which have more FIR-emission than can be accounted for by a linear N(I)/I100 correlation. The clumps are connected to I filaments. A detailed analysis of one of the clumps reveals that the FIR-excess is associated mainly with the filament and to a lesser degree with the clump. This result is in contradiction to our CO observations which show strong emission in the clump and only weak emission in the filament. We have evidence that the FIR-excess in the filament is partly caused by an increased dust temperature and not due to the existence of H2 alone. We conclude that the filament and the clump represent different epochs in the transition from atomic to molecular gas. The clump is more evolved and might be close to chemical equilibrium while formation of molecular gas has not reached equilibrium in the filament. We ascribe the increased temperature in the filament to chemical energy released by H2 formation on dust grains.

Abstract Copyright: ∼

Journal keyword(s): ISM: abundances - ISM: clouds - ISM: individual objects: IVC 135+54-45 - ISM: molecules - infrared: ISM: continuum - radio lines: ISM

Nomenclature: Table 1: [WHH99] Clump A (Nos A-C).

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 HRK 135.3+54.5 Cld 11 51 39 +61 13.3           ~ 23 0

Query : 1999A&A...344..955W

Basic data :
HRK 135.3+54.5 -- 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: 		Cld (HRK,IVC,...)
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) : 		11 51 39.0 +61 13 18 [ ] E ~
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) : 		11 49 00.1 +61 29 59 [ ]
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) : 		135.2640 +54.4519 [ ]
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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The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (5) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HRK 135.3+54.5 IVC 135.5+54.5-47 [H75b] 135.5+54.5-47
IVC 135+54-45 IVC 135+54-46

References (23 between 1850 and 2024) (Total 23)
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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