J/PASP/118/1077 Metal-strong damped Lyα systems (Herbert-Fort+, 2006)
The metal-strong damped Lyα systems.
Herbert-Fort S., Prochaska J.X., Dessauges-Zavadsky M., Ellison S.L.,
Howk J.C., Wolfe A.M., Prochter G.E.
<Publ. Astron. Soc. Pac., 118, 1077-1097 (2006)>
=2006PASP..118.1077H 2006PASP..118.1077H
ADC_Keywords: QSOs ; Redshifts ; Spectroscopy
Abstract:
We have identified a metal-strong [logN(Zn+)≥13.15 or
logN(Si+)≥15.95] damped Lyα (MSDLA) population from an automated
quasar (QSO) absorber search in the Sloan Digital Sky Survey (SDSS)
Data Release 3 quasar sample and find that MSDLAs comprise ≫5% of the
entire DLA population with zabs≥2.2 found in QSO sight lines with
r<19.5. We have also acquired 27 Keck ESI (Echellete Spectrograph and
Imager) follow-up spectra of metal strong candidates in order to
evaluate our automated technique and examine the MSDLA candidates at
higher resolution.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 75 435 *Metal-strong candidates from SDSS-DR3
tables.dat 61 874 Ionic column densities for 27 sources
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Note on table3.dat: systems identified in Simbad as
[HPD2006] SDSS JHHMMSS.ss+DDMMSS.s abs N.NNN, where N.NNN is zabs.
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See also:
VII/243 : SDSS quasar catalog. III. (Schneider+, 2005)
http://www.sdss.org/ : SDSS Home Page
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Plate SDSS plate number
6- 10 I5 --- MJD SDSS MJD number
12- 14 I3 --- Fiber SDSS fiber number
16- 17 I2 h RAh Right ascension (J2000)
19- 20 I2 min RAm Right ascension (J2000)
22- 26 F5.2 s RAs Right ascension (J2000)
28 A1 --- DE- Declination sign (J2000)
29- 30 I2 deg DEd Declination (J2000)
32- 33 I2 arcmin DEm Declination (J2000)
35- 38 F4.1 arcsec DEs [0/60] Declination (J2000)
40- 44 F5.2 mag rmag SDSS r magnitude
46- 50 F5.3 --- zem Emission redshift
52- 56 F5.3 --- zabs Absorption redshift
58- 59 I2 --- Qual [0,18] Quality (1)
61 I1 --- Rating [4/5] Metal rating flag (2)
63- 66 A4 --- --- [SDSS]
67- 75 A9 --- Name Name for objects with data in tables.dat
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Note (1): The automatically-assigned overall quality from sdss_search; 18
is the highest rating (for metal-strong systems showing corresponding
candidate DLAs detected by sdss_dla), otherwise 10.0 for metal-strong
systems without Lyα coverage. Three quality points are deducted
if no candidate DLA is detected when Lyα coverage is present.
Note (2): Metal rating flag determined from visual inspection of
our SDSS sample is
4 = strong;
5 = very strong.
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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- 4 A4 --- --- [SDSS]
5- 13 A9 --- Name Name (HHMM-DDMM)
15- 19 F5.3 --- z Redshift
21- 26 A6 --- Ion Ion designation
28- 35 F8.3 0.1nm lambda Wavelength
37 I1 --- Flag [0/5] Flag on ion detection (1)
39 A1 --- l_logN Limit flag on logN
40- 44 F5.2 [cm-2] logN ? Ionic column density
46- 49 F4.2 [cm-2] e_logN ? rms uncertainty on logN
51 A1 --- l_logNad Limit flag on logNadopt
52- 56 F5.2 [cm-2] logNad ? Adopted ionic column density (2)
58- 61 F4.2 [cm-2] e_logNad ? rms uncertainty on logNadopt
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Note (1): Flag as follows:
0 = Non-dominant ion or blended transition
1 = Dominant ion
2 = Saturated, non-dominant ion
3 = Saturated, dominant ion
4 = Upper limit, non-dominant ion
5 = Upper limit, dominant ion
Note (2): Weighted mean or most stringent limit
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 14-Dec-2007