J/ApJS/145/355 Interstellar NaI lines toward anticenter (Genova+, 2003)
Kinematical structure of the local interstellar medium:
the Galactic anticenter hemisphere.
Genova R., Beckman J.E.
<Astrophys. J. Suppl. Ser. 145, 355 (2003)>
=2003ApJS..145..355G 2003ApJS..145..355G
ADC_Keywords: Interstellar medium ; Radial velocities
Keywords: ISM: atoms - ISM: clouds - ISM: general -
ISM: kinematics and dynamics - ISM: molecules - ISM: structure
Abstract:
A survey of interstellar NaI D1 and D2 absorption features in the
spectra of 104 early-type stars in the second and third Galactic
quadrants reveals the large-scale kinematics of the interstellar gas
within the Galactic anticenter hemisphere at distances from the Sun
between ∼70 and ∼250pc. Employing a technique that uses both the
radial velocities and column densities of the NaI absorptions
produced by the intervening gas we have identified the velocity
vectors and determined the spatial distribution of eight interstellar
clouds in the volume explored.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 77 104 Program stars
table2.dat 85 160 Interstellar NaI D lines detected
table3.dat 58 11 Stars rejected
table4.dat 238 11 Velocity Vectors Identified
tables.dat 72 118 Stars in whose lines of sight cloud AG1-AG8
is detected (table5 to 12)
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Star sequence number
5- 10 I6 --- HD HD number
12- 24 A13 --- Name Star name
26- 31 F6.2 deg GLON Galactic longitude
33- 38 F6.2 deg GLAT Galactic latitude
40- 43 F4.2 mag Vmag The V band magnitude
45- 50 A6 --- SpType MK spectral type
52- 56 F5.2 mas plx Hipparcos parallax in units of milliarcseconds
58- 61 F4.2 mas e_plx The 1σ error in plx
63 A1 --- l_Dist Limit flag on Dist
65- 70 F6.1 pc Dist Central heliocentric distances
72- 76 F5.1 pc e_Dist ? The 1σ error in Dist
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Star sequence number
5- 10 I6 --- HD HD number
12- 24 A13 --- Name Star name
26- 31 F6.2 km/s RVOB Observed LSR radial velocity component
33- 36 F4.2 km/s e_RVOB Uncertainty in RVOB
38- 45 E8.2 cm-2 N(NaI) The NaI column density
47- 54 E8.2 cm-2 e_N(NaI) Uncertainty in N(NaI)
56- 60 F5.2 km/s bvel Internal velocity dispersion (1)
62- 65 F4.2 km/s e_bvel Uncertainty in bvel
67- 72 F6.2 10-13m EWD2 D2 equivalent width in milliAngstroms
74- 78 F5.1 10-13m EWD1 ? D1 equivalent width in milliAngstroms
80- 85 A6 --- f_EWD1 Descriptive flag for EWD1
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Note (1): Internal velocity dispersion given by
b=[(2kT)/m+2(vt)2]0.5
where vt is the rms turbulent velocity along the line of sight.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Star sequence number
5- 10 I6 --- HD HD number
13- 62 A50 --- Note Reason of the reject
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Cloud Cloud name
5- 8 F4.1 km/s VLSR LSR Velocity
10- 12 F3.1 km/s e_VLSR ? rms uncertainty on VLSR
15- 19 F5.1 deg GLONlsr LSR Galactic longitude
21- 23 F3.1 deg e_GLONlsr ? rms uncertainty on GLONlsr
25- 29 F5.1 deg GLATlsr LSR Galactic latitude
31- 33 F3.1 deg e_GLATlsr ? rms uncertainty on GLATlsr
35- 38 F4.1 km/s VHel Heliocentric velocity
40- 42 F3.1 km/s e_VHel ? rms uncertainty on VHel
44- 48 F5.1 deg GLONhel Heliocentric Galactic longitude
50- 52 F3.1 deg e_GLONhel ? rms uncertainty on GLONhel
54- 58 F5.1 deg GLAThel Heliocentric Galactic latitude
60- 62 F3.1 deg e_GLAThel ? rms uncertainty on GLAThel
64-244 A181 ---- Note Note for previously identified objects
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Byte-by-byte Description of file: tables.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Cloud Name of the cloud detected
5- 7 I3 --- Seq Star sequence number
9- 14 I6 --- HD HD number
16- 21 F6.2 km/s RVOB Observed LSR radial velocity
23- 26 F4.2 km/s e_RVOB rms uncertainty on RVOB
28- 32 F5.1 km/s Vel Projection of cloud velocity vector
34- 36 F3.1 km/s e_Vel rms uncertainty on Vel
38- 41 F4.1 km/s Delta Difference, VROB-Vel
43- 45 F3.1 km/s e_Delta rms uncertainty on Delta
47- 54 E8.2 cm-2 N(NaI) Cloud NaI column density
56- 63 E8.2 cm-2 e_N(NaI) rms uncertainty on cloud NaI column density
65- 68 F4.1 km/s bvel b-value of the absorption produced by the cloud
70- 72 F3.1 km/s e_bvel rms uncertainty on bvel
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Table 15: Physical Parameters of the Clouds
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Range
Cloud n(NaI) n(HI+H2) Mass ρn ρf GLON GLAT
10-9cm-3 cm-3 100M☉ pc pc deg deg
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AG1 7.5 ±1.8 1.3 ±0.2 18. ∼110 ∼240 90- 110 -25- +5
AG2 3.1 ±1.1 0.6 ±0.2 11. ∼110 ∼210 100- 135 -30- -10
AG3 0.37±0.25 0.08±0.05 0.8 ∼ 95 ∼115 160- 200 -25- +15
AG4 ∼5.1 ∼1.0 7.5 ∼260 ∼300 90- 100 -20- -15
AG5 9.2 ±2.1 1.7 ±0.4 80. 100-300 225-340 90- 115 -25- +15
AG6 2.2 ±0.7 0.4 ±0.2 100. ∼ 90 ∼275 120- 200 -50- +10
AG7 2.2 ±1.7 0.4 ±0.3 35. ∼110 ∼160 170- 220 -10- +20
AG8 0.37±0.18 0.03±0.01 1.1 ∼130 ∼190 175->210 -40- -15
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 31-Mar-2003