J/A+A/463/1227 Catalogue of far-infrared loops in the Galaxy (Konyves+, 2007)
Catalogue of far-infrared loops in the Galaxy.
Konyves V., Kiss Cs., Moor A., Kiss Z.T., Toth L.V.
<Astron. Astrophys. 463, 1227 (2007)>
=2007A&A...463.1227K 2007A&A...463.1227K
ADC_Keywords: Infrared sources ; Interstellar medium
Keywords: catalogs - ISM: bubbles - Galaxy: structure
Abstract:
An all-sky survey of loop- and arc-like intensity enhancements has
been performed in order to investigate the large-scale structure of
the diffuse far-infrared emission.
We used maps made of 60 and 100um processed IRAS data (Sky Survey
Atlas and dust infrared emission maps) to identify large-scale
structures: loops, arcs or cavities, in the far-infrared emission in
the Galaxy. Distances were attributed to a subsample of loops using
associated objects.
We identified 462 far-infrared loops, analyzed their individual FIR
properties and their distribution. This data forms the Catalogue of
Far-Infrared Loops in the Galaxy. We obtained observational estimates
of f_in∼30% and f_out∼5% for the hot gas volume filling factor of the
inward and outward Galactic neighbourhood of the Solar System. We
obtained a slope of the power law size luminosity function β=1.37
for low Galactic latitudes in the outer Milky Way.
Deviations in the celestial distribution of far-infrared loops clearly
indicate, that violent events frequently overwrite the structure of
the interstellar matter in the inner Galaxy. Our objects trace out the
spiral arm structure of the Galaxy in the neighbourhood of the Sun and
their distribution clearly suggests that there is an efficient process
that can generate loop-like features at high Galactic latitudes. Power
law indices of size luminosity distributions suggest, that the
structure of the ISM is ruled by supernovae and stellar winds at low
Galactic latitudes while it is governed by supersonic turbulence above
the Galactic plane.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
appenb.dat 83 317 Parameters of the far-infrared loops found in
the 1st, 3rd and 4th Galactic quadrants
appenc.dat 88 77 Distances to individual loops
append.dat 109 4300 Objects found to be (apparently) associated with
our loops (see Appendix A for details)
refs.dat 79 33 References
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See also:
I/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)
J/A+A/418/131 : Far-infrared loops in the 2nd Galactic Quadrant (Kiss+, 2004)
Byte-by-byte Description of file: appenb.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [GIRL]
6- 12 A7 --- GIRL GIRL designation (Glll+bb)
13 A1 --- m_GIRL [B] Multiplicity index on GIRL
15- 19 F5.1 deg GLON Galactic longitude of the centre of the
fitted ellipse
21- 25 F5.1 deg GLAT Galacitc latitude of the centre of the
fitted ellipse
27- 30 F4.1 deg Maj Semi major axis of the fitted ellipse
32- 35 F4.1 deg Min Semi minor axis of the fitted ellipse
37- 40 I4 deg PA [-90/163] Position angle of the ellipse,
relative to the Galactic longitude main
circles, from E to N
42- 45 F4.1 deg Iedge Inner edge of loop
47- 50 F4.1 deg Oedge Outer edge of loop
52- 56 F5.1 --- PsiI100 Significance parameter derived from
IRAS/ISSA 100um images (1)
58- 61 F4.1 --- PsiSDF100 Significance parameter derived from Schlegel
et al., 1998ApJ...500..525S 1998ApJ...500..525S, 100um map
63- 66 F4.1 --- PsiEBV Significance parameter derived from Schlegel
et al., 1998ApJ...500..525S 1998ApJ...500..525S, reddening
68- 72 F5.1 --- PsiI60 Significance parameter derived from
IRAS/ISSA 60um images (1)
74- 78 F5.2 mag CI Far-infrared colour index, DI60/DI100
80- 83 F4.2 mag e_CI Error of the far-infrared colour index
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Note (1): IRAS/ISSA survey, Wheelock et al., 1994, IRAS Sky Survey Atlas
Explanatory Supplement, JPL Publ. 91-11.
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Byte-by-byte Description of file: appenc.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [GIRL] GIRL for Galactic InfraRed Loop
6- 12 A7 --- GIRL Name of the loop (Glll+bb)
14- 18 F5.3 kpc Dist ? Derived distance
20- 24 F5.3 kpc Size1 ? Corresponding size
25 A1 --- --- [x]
26- 30 F5.3 kpc Size2 ? Corresponding size
32- 51 A20 --- AssObj Name of objects used to derive the distance of
the loop
53 A1 --- l_DistA1 Limit flag on DistA1
54- 58 F5.3 kpc DistA1 ? Distance of object used to derive the distance
of the loop
59 A1 --- --- [-]
60- 64 F5.3 kpc DistA2 ? Distance of object used to derive the distance
of the loop (upper limit in some cases)
66- 70 F5.3 kpc e_DistA ? rms uncertainty on DistA1 and DistA2
72- 88 A17 --- r_DistA Reference of DistA1 and DistA2
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Byte-by-byte Description of file: append.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [GIRL]
6- 12 A7 --- GIRL Name of the loop (Glll-bb)
14- 39 A26 --- Name Object name, sometimes multiple names are
provided
41- 45 A5 --- Type Code of object type (1)
47- 50 A4 --- Pos [in ring] Relative position to the loop wall (2)
52- 57 F6.2 deg GLON Galactic longitude of the associated object
59- 64 F6.2 deg GLAT Galactic latitude of the associated object
66- 71 F6.1 arcmin Deff ? Extent, effective diameter for HII regions
and dark clouds (3)
73- 78 F6.1 arcmin Maj ? Extent, major axis for dark clouds (3)
80- 85 F6.1 arcmin Min ? Extent, minor axis for dark clouds (3)
87- 91 F5.1 deg GLONl ? Lower limit of Galactic longitude of extent,
for OB associations (3)
93- 97 F5.1 deg GLONu ? Upper limit of Galactic longitude of extent,
for OB associations (3)
99-103 F5.1 deg GLATl ? Lower limit of Galactic latitude of extent,
for OB associations (3)
105-109 F5.1 deg GLATu ? Upper limit of Galactic latitude of extent,
for OB associations (3)
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Note (1): Code of object type as follows:
DC = dark cloud
SNR = supernova remnant
PSR = pulsar
HII = HII region
MC = IRAS point source with molecular core FIR colours
TT = IRAS point source with T Tau star-like FIR colours
ASSOC = OB association
Molecular cores and T Tauri stars were selected from the IRAS Point
Source Catalogue (Joint IRAS Science Worknig Group, 1988, II/125)
using the following criteria:
- point sources associated with galaxies were excluded
- photometric qualities are 2 or better at 12, 25, and 60um
- molecular cores:
0.4≤log(F(25)/F(12))≤1.0 and
0.4≤log(F(60)/F(25))≤1.3
- T Tauri stars:
0.0≤log(F(25)/F(12))≤0.5 and
-0.2≤log(F(60)/F(25))≤0.4
following the definitions by Emerson (1988, Formation and Evolution of
Low Mass Stars, NATO Advanced Institude (ASI) Series C, Vol. 241,
Kluwer, Dordrecht, p.193). F(12), F(25), and F(60) are the 12, 25,
and 60um uncorrected IRAS fluxes, respectively.
Note (2): An object is included if:
in = it is inside the inner edge of the loop wall (a≤ain)
ring = it is on the wall of the loop (ain≤a≤aout)
Note (3): Some object types has no extent.
- For HII regions an effective diameter is presented (arcmin).
- For dark clouds the size is specified via their effective diameter
or by major/minor axes (arcmin).
In the case of OB associations the limits of extent are supplied in
galactic coordinates (deg).
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Ref Reference code
19- 37 A19 --- BibCode BibCode
39- 58 A20 --- Aut Author's name
60- 79 A20 --- Com Comments
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Acknowledgements: Vera Konyves, v.konyves(at)astro.elte.hu
(End) Patricia Vannier [CDS] 12-Dec-2006