J/ApJ/769/54 Spectroscopy of Damped Lyα (DLA) systems (Neeleman+, 2013)
The fundamental plane of damped Lyα systems.
Neeleman M., Wolfe A.M., Prochaska J.X., Rafelski M.
<Astrophys. J., 769, 54 (2013)>
=2013ApJ...769...54N 2013ApJ...769...54N
ADC_Keywords: Equivalent widths ; QSOs ; Redshifts ; Abundances
Keywords: galaxies: abundances; galaxies: evolution;
galaxies: fundamental parameters; galaxies: ISM;
galaxies: kinematics and dynamics; quasars: absorption lines
Abstract:
Using a sample of 100 H I-selected damped Lyα (DLA) systems,
observed with the High Resolution Echelle Spectrometer on the Keck I
telescope, we present evidence that the scatter in the well-studied
correlation between the redshift and metallicity of a DLA is largely
due to the existence of a mass-metallicity relationship at each
redshift. To describe the fundamental relations that exist between
redshift, metallicity, and mass, we use a fundamental plane
description, which is described by the following equation:
[M/H]=(-1.9±0.5)+(0.74±0.21)*logΔv90-(0.32±0.06)*z.
Here, we assert that the velocity width, Δv90, which is
defined as the velocity interval containing 90% of the integrated
optical depth, traces the mass of the underlying dark matter halo.
This description provides two significant improvements over the
individual descriptions of the mass-metallicity correlation and
metallicity-redshift correlation. Firstly, the fundamental equation
reduces the scatter around both relationships by about 20%, providing
a more stringent constraint on numerical simulations modeling DLAs.
Secondly, it confirms that the dark matter halos that host DLAs
satisfy a mass-metallicity relationship at each redshift between
redshifts 2 through 5.
Description:
All of the spectra in this sample were obtained with the High
Resolution Echelle Spectrometer (HIRES) on the Keck I 10m telescope
over the course of almost two decades of observing (1994/Sep/30 -
2011/Apr/23). Table 1 shows a detailed journal of observations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 63 145 Journal of observations
table2.dat 107 100 HIRES DLA sample
refs.dat 67 26 References
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See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
J/MNRAS/435/482 : DLA system from SDSS DR5 (Jorgenson+, 2013)
J/ApJ/755/89 : Metallicities of damped Lyα systems (Rafelski+, 2012)
J/A+A/547/L1 : SDSS-III DR9 DLA catalogue (Noterdaeme+, 2012)
J/A+A/530/A33 : Evolutionary tracks of DLA depletions (Vladilo+, 2011)
J/ApJ/721/1 : Keck ESI observations of Lyα systems (Penprase+, 2010)
J/A+A/505/1087 : DLAs in SDSS-DR7 (Noterdaeme+, 2009)
J/ApJ/683/321 : Metallicities of GRB, DLA, & Lyα gal. (Fynbo+, 2008)
J/A+A/478/701 : Color excess of SDSS QSOs with DLA systems (Vladilo+, 2008)
J/A+A/473/791 : CIV absorption in DLAs and sub-DLAs systems (Fox+, 2007)
J/ApJS/171/29 : UCSD/Keck DLA Abundance Database (Prochaska+, 2007)
J/PASP/118/1077 : Metal-strong damped Lyα systems (Herbert-Fort+, 2006)
J/AJ/130/1345 : Optical-infrared colors of CORALS QSOs (Ellison+, 2005)
J/ApJ/635/123 : The SDSS-DR3 damped Lyα survey (Prochaska+, 2005)
J/MNRAS/354/L31 : SDSS DR2 QSO and DLA properties (Murphy+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- QSO QSO name
13- 14 I2 h RAh Hour of Right Ascension (J2000)
16- 17 I2 min RAm Minute of Right Ascension (J2000)
19- 22 F4.1 s RAs Second of Right Ascension (J2000)
24 A1 --- DE- Sign of the Declination (J2000)
25- 26 I2 deg DEd Degree of Declination (J2000)
28- 29 I2 arcmin DEm Arcminute of Declination (J2000)
31- 34 F4.1 arcsec DEs Arcsecond of Declination (J2000)
36- 40 F5.3 --- zem [1.9/5.3] QSO emission line redshift
42- 52 A11 "YYYY/MMM/DD" Date UT date of observation
54- 58 I5 s Exp Exposure time
60 I1 km/s Res [5/8] FWHM resolution of the spectrum
62- 63 I2 --- SN [5/80] Signal-to-noise per pixel
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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 --- QSO QSO name
13- 18 F6.4 --- zabs [1.6/5.1] Absorption redshift of DLA
20- 24 F5.2 [cm-2] NHI [20.3/22] Log of the hydrogen column density
26- 29 F4.2 [cm-2] e_NHI [0.01/0.2] Error in NHI
31- 35 F5.2 [-] [M/H] [-2.7/-0.2] Log of "Metal" to hydrogen number
abundance
37- 40 F4.2 [-] e_[M/H] Error in [M/H]
42 A1 --- l_lc Limit flag on lc
43- 48 F6.2 [10-7W] lc [-28/-25.3]? Log of 158um cooling rate per
atom; in erg/s/H
50- 53 F4.2 [10-7W] e_lc ? Error in lc; erg/s/H
55- 59 F5.3 [0.1nm] EW [0.03/2.9]? Log of equivalent width of
SiII 1526 line; in Angstroms
61- 65 F5.3 [0.1nm] e_EW ? Error in ew; Angstroms
67- 69 I3 km/s DelV [17/484] Velocity width (ΔV90) (1)
71- 75 A5 --- Ion Transition element used for DelV measurement
77- 80 I4 0.1nm lambda Rest-frame wavelength of transition
82- 94 A13 --- Select Main selection criterion for observing DLA:
HI-selected, High redshift, or Serendipitous
96-107 A12 --- Ref Reference(s) (see refs.dat file)
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Note (1): The uncertainty on the DelV measurement is taken to be 10km/s
for each measurement.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference code
4- 22 A19 --- BibCode Bibcode
24- 48 A25 --- Aut Author's name(s)
50- 67 A18 --- Comm Comment
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 09-Dec-2014