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J/ApJS/136/463 Distances and metallicities of HVCs and IVCs (Wakker, 2001)
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Distances and metallicities of high- and intermediate-velocity clouds.
Wakker B.P.
<Astrophys. J. Suppl. Ser. 136, 463 (2001)>
=2001ApJS..136..463W
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ADC_Keywords: Molecular clouds ; Abundances ; Stars, distances
Keywords: Galaxy: halo - SM: abundances - ISM: clouds - ISM: structure -
radio lines: ISM - ultraviolet: ISM
Description:
A table is presented that summarizes published absorption line
measurements for the high- and intermediate-velocity clouds (HVCs and
IVCs). New values are derived for N(HI) in the direction of observed
probes, in order to arrive at reliable abundances and abundance limits
(the HI data are described in Paper II, Wakker et al.,
2001ApJS..136..537W). Distances to stellar probes are revisited and
calculated consistently, in order to derive distance brackets or
limits for many of the clouds, taking care to properly interpret
nondetections.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2a.dat 134 251 Published results for all HV/IV clouds
table2b.dat 203 1078 Published results for all probes of each
HVC/IVC, sorted by cloud
cloud.dat 29 57 Cloud types
telescop.dat 65 22 Telescope names
refs.dat 264 129 References
notes.dat 80 278 Notes
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See also:
J/ApJS/79/77 : Bell Lab. H I Survey - High Velocity Clouds (Stark+ 1992)
Byte-by-byte Description of file: table2a.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- CNum Cloud number in cloud.dat file
4- 19 A16 --- Name Cloud name
21 A1 --- l_Distu Limit flag on Distu
22- 26 F5.2 kpc Distu ? Distance to cloud or upper limit if
Distl given
28 A1 --- l_Distl Limit flag on Distl
29- 33 F5.2 kpc Distl ? Lower limit on cloud distance
35 A1 --- l_Zupper Limit flag on Zupper
36- 40 F5.2 kpc Zupper ? Upper limit on cloud height above
galactic plane
42 A1 --- l_Zlower Limit flag on Zlower
43- 47 F5.2 kpc Zlower ? Lower limit on cloud height above
galactic plane
49- 54 A6 --- Ion Ion name
56- 67 E12.2 cm-2 Nion ? Expected column density
69 A1 --- l_Abd Limit flag on Abd
70- 82 E13.2 --- Abd ? Ion abundance (Nion/NHI)
84- 96 E13.2 --- e_Abd ? Uncertainty in Abd
98-110 E13.2 --- EAbd ? Expected ion abundance
112 A1 --- l_DAbd Limit flag on DAbd
115-123 F9.6 Sun DAbd ? Derived abundance relative to solar
125-134 A10 --- n_Name Notes on Name, comma-separated
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Byte-by-byte Description of file: table2b.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- CNum Cloud number in cloud.dat file
4 A1 --- f_Name [m] Indicates a mistaken claim of absorption
6- 18 A13 --- Name Probe name
20- 25 F6.2 deg GLON Galactic longitude
27- 32 F6.2 deg GLAT Galactic latitude
35- 39 F5.2 kpc Dis ? Probe distance
42- 45 F4.2 kpc e_Dis ? Error in Dis
47 A1 --- f_Dis Method of determination of Dis (2)
50- 54 F5.2 kpc Zheight ? Probe height above galactic plane
56- 63 A8 --- Type Spectral type of star or classification of
extra-galactic object
65- 71 A7 --- Cloud Name of HV or IV cloud or complex
73 A1 --- f_vHVC [abcu] Flag on vHVC (3)
75- 78 I4 km/s vHVC ? LSR velocity of HVC or IVC toward probe
80 A1 --- l_NHI Limit flag for NHI
81- 90 E10.2 cm-2 NHI ? HI column density of HVC/IVC
92- 99 E8.2 cm-2 e_NHI ? Error in NHI
101-102 A2 --- Tel Telescope used to measure NHI in
telescop.dat file
104 A1 --- f_Ion [(] Indicates Ion data is superseded by
newer measurements
105-110 A6 --- Ion Observed ion
112-115 I4 km/s vION ? LSR velocity of absorption
117 A1 --- l_Nion Limit flag for Nion
119-130 E12.2 cm-2 Nion Column density for ion
(see Note 5 when f_Nion = t)
132-143 E12.2 cm-2 e_Nion ? Error in Nion
145 A1 --- f_Nion Note on determination of Nion (5)
147 A1 --- l_Abd Limit flag for Abd
148-160 E13.2 --- Abd ? Ion abundance (Nion/NHI)
162-174 E13.2 --- e_Abd ? Error in Abd
176 A1 --- l_Asol Limit flag Asol
177-187 F11.6 --- Asol ? Ion abundance relative to solar abundance
(see Note 5 when f_Nion = t)
189 A1 --- Drelev Flag indicating whether probe gives relevant
distance information (6)
191-193 A3 --- r_Name Reference number in refs.dat file
194 A1 --- --- [)] Closes off the column labelled f_Ion
196-204 A9 --- n_Name Notes in notes.dat file, comma-separated
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Note (2): Method of determination of Distance:
p = 1/parallax, as measured by Hipparcos;
a = from detailed atmospheric analysis;
g = use the distance of a globular cluster or the LMC;
s = spectroscopic distance based on spectral type;
t = spectroscopic distance based on spectral type, even though
parallax was measured;
r = value quoted in reference;
E = extra-galactic object.
Note (3): Note on HVC velocity
u = HVC velocity at which an upper limit to the HI column density is set;
a = indicates the second component of a multicomponent absorption;
b = indicates the second component of a multicomponent absorption;
c = indicates the third component of a multicomponent absorption.
Note (5): Note on Column density for ion:
N = Proper derivation done in reference;
L = Log of column density given in reference;
W = Converted from equivalent width;
E = Detection inferred from large equivalent width;
t = indicates a 21-cm observation. Nion column contains the column
density of the absorbing cool HI and Abd column contains the
optical depth of the absorption.
S = Upper limit based on S/N ratio in spectrum.
Note (6): See Appendix A for further details.
U = Detection in stellar spectrum sets upper limit
l = Significant non-detection sets lower limit (limit on colum
density below (expected value)/(safety factor))
L = Significant non-detection sets lower limit (limit on column
density below (expected value)/(3 times safety factor))
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Byte-by-byte Description of file: cloud.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- CNum Cloud number
4 A1 --- --- [=]
6- 29 A24 --- Type Nature of the cloud
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Byte-by-byte Description of file: telescop.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Tel Telescope code
4 A1 --- --- [=]
6- 65 A60 --- Text Telescope
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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- 3 I3 --- Ref Reference number
5- 44 A40 --- BibCodes List of (up to 2) bibCode designating the
articles
46- 84 A39 --- Aut Author's name
86-285 A200 --- Com Comments
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Note Note code
5- 80 A76 --- Text Text of the note
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History:
From electronic version of the journal
References:
Wakker et al., Paper II 2001ApJS..136..537W
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(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 14-Jan-2002