J/ApJ/702/1472 Column densities for HI, AlIII, SiIV, CIV, OVI (Savage+, 2009)
The extension of the transition temperature plasma into the lower Galactic halo.
Savage B.D., Wakker B.P.
<Astrophys. J., 702, 1472-1489 (2009)>
=2009ApJ...702.1472S 2009ApJ...702.1472S
ADC_Keywords: Abundances ; Ultraviolet ; Interstellar medium ; Milky Way
Keywords: Galaxy: halo - ISM: clouds - ISM: structure - ultraviolet: ISM
Abstract:
Column densities for HI, AlIII, SiIV, CIV, and OVI toward 109 stars
and 30 extragalactic objects have been assembled to study the
extensions of these species away from the Galactic plane into the
Galactic halo. HI and AlIII mostly trace the warm neutral and warm
ionized medium, respectively, while SiIV, CIV, and OVI trace a
combination of warm photoionized and collisionally ionized plasmas.
The much larger object sample compared to previous studies allows us
to consider and correct for the effects of the sample bias that has
affected earlier but smaller surveys of the gas distributions. The
observations are compared to the predictions of the various models for
the production of the transition temperature gas in the halo.
Description:
We have supplemented the IUE (FUSE surveys of OVI with the
International Ultraviolet Explorer satellite at a resolution of
25km/s, Savage et al. (2001, Cat. J/ApJS/136/631)) and FUSE (OVI
toward many of those stars with FUSE at a resolution of 20km/s by
Bowen et al. (2008, Cat. J/ApJS/176/59)) disk/halo star effort with
new measurements of SiIV and CIV absorption from the Space Telescope
Imaging Spectrograph (STIS) archive of 25 extragalactic objects for
which good quality OVI data exist from FUSE. These new observations
are from B. P. Wakker et al. (2010, in preparation).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 129 140 Column densities
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See also:
J/ApJS/176/59 : FUSE survey of OVI in the disk of the Milky Way (Bowen+, 2008)
J/ApJ/647/312 : FUSE survey of OVI in the Milky Way (Otte+, 2006)
J/AJ/125/2502 : Spectral indices of Galactic halo (Morrison+, 2003)
J/ApJS/146/1 : O VI absorption in FUSE survey (Wakker+, 2003)
J/ApJS/136/631 : IUE absorption toward 164 early-type stars (Savage+, 2001)
J/ApJS/93/211 : IUE survey of H I Lyα absorption. I. (Diplas+ 1994)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Star HD number or alternate name
18- 28 A11 --- Class Object type for AGN or MK spectral type (1)
30- 35 F6.2 deg GLON Galactic longitude
37- 42 F6.2 deg GLAT Galactic latitude
44- 47 F4.1 kpc Dist ? Stellar distance, d (1)
49- 52 F4.2 --- Sig ? The estimated logarithmic error (dex) in
the distance (1)
54- 57 A4 --- HII Prominent HII regions associated with the
star as identified via the footnotes
58 A1 --- f_HII [a-g] Note related with line of sight (2)
60 I1 --- [R] [0,3]? The 0.25-1.0keV brightness of the
X-ray sky in the direction of each object (3)
62- 66 F5.2 [cm-2] lgN(H1) ? Logarithmic HI column density (4)
68- 71 F4.2 [cm-2] e_lgN(H1) ? lgN(H1) uncertainty
73 A1 --- l_lgN(Al3) Limit flag on lgN(Al3)
74- 78 F5.2 [cm-2] lgN(Al3) ? Logarithmic AlIII column density
79 A1 --- u_lgN(Al3) [:] Uncertainty flag on lgN(Al3)
81- 84 F4.2 [cm-2] e_lgN(Al3) ? lgN(Al3) uncertainty
86 A1 --- l_lgN(Si4) Limit flag on lgN(Si4)
87- 91 F5.2 [cm-2] lgN(Si4) ? Logarithmic SiIV column density
93- 96 F4.2 [cm-2] e_lgN(Si4) ? lgN(Si4) uncertainty
98 A1 --- l_lgN(C4) Limit flag on lgN(C4)
99-103 F5.2 [cm-2] lgN(C4) ? Logarithmic CIV column density
104 A1 --- u_lgN(C4) [:] Uncertainty flag on lgN(C4)
106-109 F4.2 [cm-2] e_lgN(C4) ? lgN(C4) uncertainty
111 A1 --- l_lgN(O6) Limit flag on lgN(O6)
112-116 F5.2 [cm-2] lgN(O6) ? Logarithmic OVI column density
118-121 F4.2 [cm-2] e_lgN(O6) ? lgN(O6) uncertainty
123-129 A7 --- Ref AlIII, SiIV & CIV and OVI sources (5)
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Note (1): From Bowen et al. (2008, Cat. J/ApJS/176/59) and references therein.
Note (2): Flag as follows:
a = Line of sight samples gas in the Scutum Supershell (see Savage et al.
2001ApJ...547..907S 2001ApJ...547..907S).
b = Line of sight samples gas in the Gum nebula.
c = Line of sight samples gas in the Vela SNR.
d = Line of sight samples gas in the Carina HII region.
e = Line of sight samples gas in Gum 42 which is also R62.
f = Line of sight samples gas in Gum 56 which is within R113.
g = Line of sight samples gas in Gum 57a which is within S2.
Note (3): [R], a measure of the 0.25-1.0keV brightness of the X-ray sky in
the direction of each object from Bowen et al. with R=0, 1, 2, and 3
implying an increasing brightness of the X-ray sky in the immediate
vicinity of the star or AGN.
Note (4): The HI column densities for the stars are from the Lyα
observations of Diplas & Savage (1994ApJ...427..274D 1994ApJ...427..274D). For the AGNs,
the HI column densities are from the 21cm results compiled by Wakker
et al. (2003, Cat. J/ApJS/146/1).
Note (5): Up to 3 references are given, the last number referencing the
source of OVI column density, and PF=Profile Fit method.
The sources are as follows:
1 = Bowen et al. 2008, Cat. J/ApJS/176/59;
2 = Savage et al. 2001, Cat. J/ApJS/136/631;
3 = Zsargo et al. 2003ApJ...586.1019Z 2003ApJ...586.1019Z;
4 = Savage & Sembach 1994ApJ...434..145S 1994ApJ...434..145S;
5 = Fox et al. 2003ApJ...582..793F 2003ApJ...582..793F;
6 = Savage et al. 2001ApJ...547..907S 2001ApJ...547..907S;
7 = Jenkins 1978ApJ...219..845J 1978ApJ...219..845J;
8 = Edgar & Savage 1992ApJ...396..124E 1992ApJ...396..124E;
9 = Brandt et al. 1999AJ....117..400B 1999AJ....117..400B;
10 = Fitzpatrick & Spitzer 1997ApJ...475..623F 1997ApJ...475..623F;
11 = Huang et al. 1995ApJ...450..163H 1995ApJ...450..163H;
12 = Howk & Savage 1999ApJ...517..746H 1999ApJ...517..746H;
13 = AGN results from B. P. Wakker et al. (2010, in preparation);
14 = LMC results from Lehner & Howk, 2007MNRAS.377..687L 2007MNRAS.377..687L;
15 = Sembach & Savage, 1992ApJS...83..147S 1992ApJS...83..147S;
16 = Hoopes et al. 2002ApJ...569..233H 2002ApJ...569..233H.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 07-Oct-2011