J/A+A/418/131 Far-infrared loops in the 2nd Galactic Quadrant (Kiss+, 2004)
Far-infrared loops in the 2nd Galactic Quadrant.
Kiss C., Moor A., Toth L.V.
<Astron. Astrophys. 418, 131 (2004)>
=2004A&A...418..131K 2004A&A...418..131K
ADC_Keywords: Infrared sources ; Interstellar medium
Keywords: catalogs - ISM: bubbles - Galaxy: structure
Abstract:
We present the results of an investigation of the large structure
of the diffuse interstellar medium in the 2nd Galactic Quadrant
(90°≤l≤180°). 145 loops were identified on IRAS based
on far-infrared maps. Our catalogue lists their basic physical
properties. The distribution clearly suggests that there is an
efficient process that can generate loop-like features at high
galactic latitudes. Distances are provided for 30 loops. We also give
an observational estimate on the volume filling factor of the hot gas
in the Local Arm, 4.6%≤f2nd<6.4%.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea.dat 82 145 Parameters of the far infrared loops found in
the 2nd Galactic Quadrant.
table2n.dat 102 60 Distances to individual loops
refs.dat 106 25 References
tablec.dat 134 1302 Objects found to be (apparently) associated with
our loops (see Sect. 3.1 for details).
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See also:
I/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)
Byte-by-byte Description of file: tablea.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [GIRL]
5 A1 --- --- [_]
6- 12 A7 --- GIRL GIRL designation (Glll+bb)
14- 18 F5.1 deg GLON Galactic longitude of the centre of the
fitted ellipse
20- 24 F5.1 deg GLAT Galacitc latitude of the centre of the
fitted ellipse
26- 29 F4.1 deg maj Semi major axis of the fitted ellipse
31- 34 F4.1 deg min Semi minor axis of the fitted ellipse
36- 38 I3 deg PA [-87/89] position angle of the ellipse,
relative to the galactic longitude main
circles, from W to N
40- 43 F4.1 deg Iedge Inner edge of loop
45- 48 F4.1 deg Oedge Outer edge of loop
50- 53 F4.1 --- PsiI100 Significance parameter derived from
IRAS/ISSA 100um images (1)
55- 58 F4.1 --- PsiSDF100 Significance parameter derived from Schlegel
et al., 1998ApJ...500..525S 1998ApJ...500..525S, 100um map
60- 63 F4.1 --- PsiEBV Significance parameter derived from Schlegel
et al., 1998ApJ...500..525S 1998ApJ...500..525S, reddening
65- 69 F5.1 --- PsiI60 Significance parameter derived from
IRAS/ISSA 60um images (1)
71- 75 F5.2 mag CI Far-infrared colour index, DI60/DI100
77- 80 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: table2n.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)
15- 19 F5.3 kpc Dist ? Derived distance
21- 25 F5.3 kpc Size1 ? Corresponding size
26 A1 --- --- [x]
27- 31 F5.3 kpc Size2 ? Corresponding size
33- 53 A21 --- AssObj Name of objects used to derive the distance
of the loop
56- 60 F5.3 kpc DistA ? Distance of object used to derive the
distance of the loop
62- 66 F5.3 kpc e_DistA ? rms uncertainty on DistA
70- 77 A8 --- Note Note
80 A1 --- f_DistA [*] *: the reference refer to a previous
description of the loop itself.
81-110 A30 --- r_DistA Reference of DistA
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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- 14 A14 --- Ref Reference code
16- 34 A19 --- BibCode BibCode
36- 56 A21 --- Aut Author's name
59-106 A48 --- Com Comments
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Byte-by-byte Description of file: tablec.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)
17- 46 A30 --- Name Object name; sometimes multiple names are
provided
50- 54 A5 --- Type Code of object type (1)
58- 61 A4 --- Pos Relative position to the loop wall
(in or ring) (2)
65- 70 F6.2 deg GLON Galactic longitude of the associated object
74- 79 F6.2 deg GLAT Galactic latitude of the associated object
83- 87 F5.1 arcmin Deff ? Extent, effective diameter for HII regions
and dark clouds (3)
90- 95 F6.1 arcmin Maj ? Extent, major axis for dark clouds (3)
96 A1 --- --- [x]
97-102 F6.1 arcmin Min ? Extent, minor axis for dark clouds (3)
106-110 F5.1 deg GLONl ? Lower limit of Galactic longitude of extent,
for OB associations (3)
111-113 A3 --- --- [<l< ]
114-118 F5.1 deg GLONu ? Upper limit of Galactic longitude of extent,
for OB associations (3)
120 A1 --- --- [;]
122-126 F5.1 deg GLATl ? Lower limit of Galactic latitude of extent,
for OB associations (3)
127-129 A3 --- --- [<b< ]
130-134 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:
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 objects is included if:
in: it is inside the inner edge of the loop wall (a≤ain
ring: f 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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Acknowledgements: Csaba Kiss
(End) Patricia Bauer [CDS] 22-Jan-2004