J/ApJ/679/194 Low-z intergalactic medium. III. (Danforth+, 2008)
The low-z intergalactic medium.
III. H I and metal absorbers at z<0.4.
Danforth C.W., Shull J.M.
<Astrophys. J., 679, 194-219 (2008)>
=2008ApJ...679..194D 2008ApJ...679..194D
ADC_Keywords: Active gal. nuclei ; Equivalent widths ; Ultraviolet ; Redshifts ;
H I data
Keywords: cosmology: observations - quasars: absorption lines -
cosmological parameters - intergalactic medium - ultraviolet: general
Abstract:
We conduct an ultraviolet (HST and FUSE) spectroscopic survey of HI
(Lyman lines) and seven metal ions (OVI, NV, CIV, CIII, SiIV, SiIII,
FeIII) in the low-redshift IGM at z<0.4. We analyzed 650 Lyα
absorbers over redshift path length Δz=5.27, detecting numerous
absorbers: 83 OVI systems, 39 CIII, 53 SiIII, 24 CIV, 24 NV, and so
on. In the low-z IGM, we have accounted for ∼40% of the baryons: 30%
in the photoionized Lyα forest and 10% in the (T=105-106)
WHIM traced by OVI. Statistical metallicities are consistent with the
canonical value of 10% solar, with considerable scatter.
Description:
We have performed detailed FUSE+STIS analyses on sight lines toward 35
bright AGNs. The combined data set covers 905-1710Å at a resolution
of 20km/s or better, at a signal-to-noise ratio (S/N) per resolution
element (S/N)res≳5 in most cases. Our final sample of 28 AGN sight
lines is presented in Table 1. We retrieved the FUSE data from the
Multimission Archive at the Space Telescope Science Institute (MAST)
archive and reduced them as in Paper II (2006ApJ...640..716D 2006ApJ...640..716D). The
archival STIS/E140M data were reduced at the University of Colorado by
S. V. Penton.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 54 28 FUSE+STIS IGM sight lines
table2.dat 98 657 H I absorbers
table4.dat 81 83 O VI detections
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See also:
J/ApJ/647/328 : FUSE survey of OVI in ISM (Dixon+, 2006)
J/ApJ/643/680 : Imaging and spectroscopy around PKS 0405-123 (Prochaska+,
2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- SLine AGN name (sight line) (G1)
13- 14 I2 h RAh Hour of right ascension (J2000)
16- 17 I2 min RAm Arcminute of right ascension (J2000)
19- 22 F4.1 s RAs Arcsecond of right ascension (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Degree of declination (J2000)
28- 29 I2 arcmin DEm Arcminute of declination (J2000)
31- 32 I2 arcsec DEs Arcsecond of declination (J2000)
34- 41 F8.6 --- z AGN redshift
43- 46 F4.1 ks STIS Exposure time with the Space Telescope Imaging
Spectrograph (STIS) aboard HST
48- 52 F5.1 ks FUSE Exposure time with the Far Ultraviolet
Spectroscopic Explorer (FUSE)
54 A1 --- Prev [Y/N] Sight line included in papers I
(2005ApJ...624..555D 2005ApJ...624..555D) and II (2006ApJ...640..716D 2006ApJ...640..716D)?
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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- 11 A11 --- SLine Sight Line (G1)
13- 19 F7.5 --- z Absorption redshift
21 A1 --- l_WLya Limit flag on WLya
22- 25 I4 10-13m WLya ? Lyα equivalent width (in mÅ)
27- 29 I3 10-13m e_WLya ? Error in WLya
31 A1 --- l_WLyb Limit flag on WLyb
32- 35 I4 10-13m WLyb ? Lyβ equivalent width (in mÅ)
37- 39 I3 10-13m e_WLyb ? Error in WLyb
41 A1 --- l_WLyg Limit flag on WLyg
42- 45 I4 10-13m WLyg ? Lyγ equivalent width (in mÅ)
47- 48 I2 10-13m e_WLyg ? Error in WLyg
50 A1 --- l_WLyd Limit flag on WLyd
51- 54 I4 10-13m WLyd ? Lyδ equivalent width (in mÅ)
56- 57 I2 10-13m e_WLyd ? Error in WLyd
59 A1 --- f_bHI Approximate flag on bHI
60- 62 I3 km/s bHI The HI doppler parameter
64- 65 I2 km/s E_bHI ? Upper error in bHI
67- 68 I2 km/s e_bHI ? Lower error in bHI (1)
70- 74 F5.2 [cm-2] logNHI Log of the HI column density
76- 79 F4.2 [cm-2] E_logNHI ? Upper error in logNHI
81- 84 F4.2 [cm-2] e_logNHI Lower error in logNHI (1)
86- 98 A13 --- Meth The HI solution method (2)
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Note (1): Or just the error if E_bHI or E_logNHI are blank.
Note (2): Method as follows:
AOD = integrated apparent optical depth;
fit = Voigt fit;
COG = multi-line curve of growth solution;
poor COG = poorly-constrained curve of growth.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- SLine Sight Line (G1)
13- 19 F7.5 --- z Absorption redshift
21 A1 --- f_b1032 Approximate flag on b1032
22- 24 I3 km/s b1032 ? The OVI (1032A) doppler parameter
26- 27 I2 km/s e_b1032 ? Error in b1032
29 A1 --- l_W1032 Limit flag on W1032
30- 33 I4 10-13m W1032 ? OVI (1032A) equivalent width (in mÅ)
35- 36 I2 10-13m e_W1032 ? Error in W1032
38 A1 --- f_b1038 Approximate flag on b1038
39- 41 I3 km/s b1038 ? The OVI (1038A) doppler parameter
43- 44 I2 km/s e_b1038 ? Error in b1038
46 A1 --- l_W1038 Limit flag on W1038
47- 50 I4 10-13m W1038 ? OVI (1038A) equivalent width (in mÅ)
52- 53 I2 10-13m e_W1038 ? Error in W1038
55 A1 --- f_bOVI Approximate flag on bOVI
56- 58 I3 km/s bOVI ? The OVI doppler parameter
60- 61 I2 km/s e_bOVI ? Error in bOVI
63- 67 F5.2 cm-2 logNOVI Log of the OVI column density
69- 72 F4.2 cm-2 e_logNOVI Error in logNOVI
74- 81 A8 --- Meth Solution method (1)
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Note (1): Method as follows:
AOD = integrated apparent optical depth;
fit = Voigt fit;
COG = multi-line curve of growth solution.
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Global notes:
Note (G1): In original tables, HE 0226-4410 is a misprint for HE 0226-4110.
Data corrected in these tables.
History:
From electronic version of the journal
References:
Danforth & Shull. Paper I. 2005ApJ...624..555D 2005ApJ...624..555D
Danforth et al. Paper II. 2006ApJ...640..716D 2006ApJ...640..716D
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 01-Oct-2010