J/ApJS/97/1 HST Quasar Absorption Line Key Project. X. (Lockman+ 1995)
The Hubble Space Telescope Quasar Absorption Line Key Project. X.
Galactic H I 21 centimeter emission toward 143 quasars and
active galactic nuclei.
Lockman F.J., Savage B.D.
<Astrophys. J. Suppl. Ser. 97, 1 (1995)>
=1995ApJS...97....1L 1995ApJS...97....1L
ADC_Keywords: QSOs ; Radial velocities ; Redshifts ; H I data
Mission_Name: HST
Keywords: galaxies: active - galaxies: quasars: absorption lines -
Galaxy: halo - ISM: clouds - radio lines: ISM
Abstract:
Sensitive H I 21cm emission line spectra have been measured for the
directions to 143 quasars and AGNs chosen from the observing lists for
the HST Quasar Absorption Line Key Project. Narrow-band and wide-band
data were obtained with the NRAO 43m radio telescope for each object.
The narrow-band data have a velocity resolution of 1km/s, extend from
-220 to +170km/s, and are corrected for stray 21cm radiation. The
wide-band data have a resolution of 4km/s and extend from -1000 to
+1000km/s. The data are important for the interpretation of
ultraviolet absorption lines near zero redshift in Key Project
spectra. Twenty-two percent of the quasars lie behind Galactic
high-velocity H I clouds with |VLSR|>100km/s whose presence can
increase the equivalent width of interstellar absorption lines
significantly. This paper contains the emission spectra and measures
of the H I velocities and column densities along the sight line to
each quasar. We discuss how the measurements can be used to estimate
the visual and ultraviolet extinction toward each quasar and to
predict the approximate strength of the strong ultraviolet resonance
lines of neutral gas species in the HST Key Project spectra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 98 143 Objects, velocities, and column densities
notes.dat 80 30 Numbered notes
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See also:
J/PASP/106/646 : HST QSO absorption-line key project. VIII. (Kirhakos+ 1994)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Object name
14- 15 I2 h RAh Right ascension (1950.0)
17- 18 I2 min RAm Right ascension (1950.0)
20- 23 F4.1 s RAs Right ascension (1950.0)
25 A1 --- DE- Declination sign
26- 27 I2 deg DEd Declination
29- 30 I2 arcmin DEm Declination
32- 33 I2 arcsec DEs Declination
35- 40 F6.2 deg GLON Galactic longitude
42- 47 F6.2 deg GLAT Galactic latitude
49- 53 F5.2 mag Vmag V magnitude
55- 59 F5.3 --- z Redshift
61 A1 --- l_E(B-V) Limit flag on E(B-V)
62- 66 F5.3 mag E(B-V) B-V colour excess
68- 71 I4 km/s V- Observed negative LSR velocity limit
of HI emission
73- 75 I3 km/s V+ Observed positive LSR velocity limit
of HI emission
77- 79 I3 km/s Average LSR velocity of the HI emission
81- 85 F5.1 10+19cm-2 N(HI)i Integrated HI column density assuming
the emission to be optically thin
87- 91 F5.1 10+19cm-2 N(HI)200 Integrated HI column density assuming
a spin temperature of 200K
93- 98 A6 --- Note Comma-separated notes (see file notes.dat)
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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- 2 I2 --- NoteNo Note number, repeated when several lines
4- 80 A77 --- Text Text of note
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History: Prepared via OCR at CDS.
* 09-Jul-1997: about a dozen missing notes (1) detected by H. Andernach
were corrected.
* 03-Apr-2000: notes inserted in a dedicated file.
References:
Bahcall et al., Paper I =1993ApJS...87....1B 1993ApJS...87....1B
Schneider et al., Paper II =1993ApJS...87...45S 1993ApJS...87...45S
Savage et al., Paper III =1993ApJ...413..116S 1993ApJ...413..116S
Turnshek et al., Paper IV =1994ApJ...428...93T 1994ApJ...428...93T
Stengler-Larrea et al., Paper V =1995ApJ...444...64S 1995ApJ...444...64S
Bergeron et al., Paper VI =1994ApJ...436...33B 1994ApJ...436...33B
Bahcall et al., Paper VII =1996ApJ...457...19B 1996ApJ...457...19B
Kirhakos et al., Paper VIII =1994PASP..106..646K 1994PASP..106..646K, Cat. J/PASP/106/646
Espey et al., Paper IX =1994ApJ...434..484E 1994ApJ...434..484E
Jannuzi et al., =1996ApJ...470L..11J 1996ApJ...470L..11J
Jannuzi et al., Paper XIII =1998ApJS..118....1J 1998ApJS..118....1J
Weymann et al., Paper XIV =1998ApJ...506....1W 1998ApJ...506....1W
Savage et al., Paper XV =2000ApJS..129..563S 2000ApJS..129..563S
(End) James Marcout, Patricia Bauer [CDS] 27-Mar-1997