J/ApJ/904/28 MgII absorbers high-resolution QSOs spectra. I. (Churchill+, 2020)
Mg II absorbers in high-resolution quasar spectra.
I. Voigt profile models.
Churchill C.W., Evans J.L., Stemock B., Nielsen N.M., Kacprzak G.G.,
Murphy M.T.
<Astrophys. J., 904, 28 (2020)>
=2020ApJ...904...28C 2020ApJ...904...28C
ADC_Keywords: QSOs; Spectra, optical; Spectra, infrared; Redshifts; Abundances
Keywords: Circumgalactic medium ; Quasar absorption line spectroscopy ;
Galaxy kinematics
Abstract:
We present the Voigt profile (VP) models, column densities, Doppler b
parameters, kinematics, and distribution of components for 422 MgII
absorbers found in a survey of 249 HIRES and UVES quasar spectra. The
equivalent width range of the sample is 0.006≲Wr(2796)≲6.23Å
and the redshift range is 0.19≲z≲2.55, with a mean of =1.18.
Based on historical precedent, we classified 180 absorbers as weak
systems (Wr(2796)<0.3Å) and 242 as strong systems
(Wr(2796)≳0.3Å). Assuming a minimum number of significant
components per system, the VP fitting, yielded a total of 2989
components, with an average of 2.7 and 10.3 components found for the
weak and strong MgII subsamples, respectively. The VP component line
density for the full sample is 8.62±0.23clouds/Å. The
distribution of VP component column density over the range
12.4≲logN(MgII)≲17.0/cm2 is well modeled with a power-law slope of
-1.45±0.01. The median Doppler b parameters are 4.5±3.5km/s,
6.0±4.5km/s, and 5.7±4.4km/s for the weak, strong, and full
samples. We modeled the probability of component velocity splitting
(the two-point velocity correlation function) of our full sample using
a three-component composite Gaussian function. Our resulting velocity
dispersions are σ1=25.4km/s, σ2=68.7km/s, and
σ3=207.1km/s. These data provide an excellent database for
studying the cosmic evolution of MgII absorber kinematic evolution.
Description:
We have analyzed 249 high-resolution, high signal-to-noise High
Resolution Echelle Spectrometer (HIRES) and Ultraviolet and Visual
Echelle Spectrograph (UVES) quasar spectra obtained from the Keck and
Very Large Telescope (VLT) observatories, respectively. The wavelength
coverage of the spectra ranges from approximately 3000-10000Å,
though there is variable coverage in this range from spectrum to
spectrum.
The resolving power of both instruments is R=45000, or ∼6.6km/s, and
the spectra have three pixels per resolution element. The resolution
is approximately constant in velocity as a function of observed
wavelength. The signal-to-noise ratios are typically 25-80.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 97 249 List of QSO spectra
table3.dat 97 481 Data of MgII system properties
table4.dat 163 2989 Voigt profile fitted parameters
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See also:
J/A+A/283/759 : CIV QSO absorption systems (Petitjean+ 1994)
J/MNRAS/371/495 : Catalogue 1806 MgII absorbers from SDSS DR3 (Bouche+, 2006)
J/ApJ/639/766 : SDSS-DR3 strong MgII absorbers (Prochter+, 2006)
J/ApJ/636/610 : Damped Lyα systems at z<1.65 (Rao+, 2006)
J/ApJS/171/29 : UCSD/Keck Damped Lya Abundance Database (Prochaska+, 2007)
J/ApJS/177/39 : Survey of low-redshift OVI absorbers (Tripp+, 2008)
J/ApJ/761/112 : High-redshift MgII absorption QSOs with FIRE (Matejek+, 2012)
J/MNRAS/434/1765 : Catalog of galaxies around PKS 0405-123 (Johnson+, 2013)
J/MNRAS/435/482 : DLA system from SDSS DR5 (Jorgenson+, 2013)
J/ApJ/788/119 : Properties of the highly ionized gas of quasars (Lehner+, 2014)
J/AJ/150/111 : KODIAQ DR1 (O'Meara+, 2015)
J/ApJS/221/2 : Keck+Magellan survey for LLSs. III. (Prochaska+, 2015)
J/ApJ/833/283 : HI-selected Lyman limit systems metallicities (Lehner+, 2016)
J/ApJS/230/8 : Compilation atomic data for key heavy elements (Cashman+, 2017)
J/MNRAS/467/3172 : HI photoionization rate z<0.5 for 79 QSOs (Gaikwad+, 2017)
J/AJ/154/114 : KODIAQ DR2 (O'Meara+, 2017)
J/ApJ/866/33 : The COS CGM compendium. I. Initial results (Lehner+, 2018)
J/ApJ/887/5 : COS CGM compendium. III. z≤1 Lyα syst. (Lehner+, 2019)
J/ApJ/883/78 : Column densities of CGM absorption lines (Pointon+, 2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- QSO QSO name in J2000 format
18- 43 A26 --- NEDID QSO name resolved in NED
45- 69 A25 --- Simbad QSO name resolved in Simbad
71- 75 F5.3 --- z [0.05/4.7] QSO emission redshift
77- 80 I4 0.1nm wavem [3001/6438] QSO spectrum minimum wavelength (Å)
82- 86 I5 0.1nm waveM [4640/10489] QSO spectrum maximum wavelength (Å)
88- 97 A10 --- Tel QSO spectrum observation facility
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- QSO QSO name in J2000 format
19- 26 F8.6 --- zabs [0.19/2.56] MgII system absorption redshift
30- 35 F6.3 0.1m W2796 [0.006/6.17] MgII 2796 rest-frame equivalent
width, Angstroms
38- 42 F5.3 0.1m e_W2796 [0/0.07] Uncertainty in W2796, Angstroms
45- 45 A1 --- l_Naod Limit flag for upper limit in Naod
47- 52 F6.3 [cm-2] Naod [11.1/14.7] log10, Apparent Optical Depth
column density
54- 58 F5.2 [cm-2] e_Naod [-0.1/-0]? Downward uncertainty in Naod (2)
60- 64 F5.2 [cm-2] E_Naod [0.01/0.2]? Upward uncertainty in Naod (2)
70- 74 F5.3 --- DR [0.02/2.47] Doublet ratio W2796/W2803
76- 81 F6.3 --- e_DR [-1/1] Uncertainty in DR
86- 91 F6.2 km/s OmegaV [2.1/267] flux weighted velocity spread
MgII 2796A
94- 97 F4.2 km/s e_OmegaV [0.07/6] Uncertainty in OmegaV
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Note (2): For upper limits the uncertainty are given as null values, i.e.,
as blanks.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- QSO QSO name in J2000 format
18- 25 F8.6 --- z [0.19/2.56] MgII absorption redshift
27- 28 I2 --- Ncld [1/43] Number of VP components
30- 36 F7.2 km/s vcld [-578/523] Velocity of VP component
38- 42 F5.2 [cm-2] N-MgII [10.5/17.2] log10, MgII VP column density
44- 48 F5.3 [cm-2] e_N-MgII [0.001/10] Uncertainty in N-MgII (1)
50- 54 F5.2 km/s b-MgII [0.15/32.32] Doppler b for MgII VP component
56- 60 F5.3 km/s e_b-MgII [0.001/9.999] Uncertainty in b-MgII (1)
62- 66 F5.2 [cm-2] N-FeII [9.66/16.4]?=0.0 log10, FeII VP column density
(2)
68- 73 F6.3 [cm-2] e_N-FeII [-1.0/10]?=0.0 Uncertainty in N-FeII (1)
75- 79 F5.2 km/s b-FeII [0.24/32.4]?=0.0 Doppler b for FeII VP component
(2)
81- 86 F6.3 km/s e_b-FeII [-1/10]?=0.0 Uncertainty in b-FeII (1)
88- 92 F5.2 [cm-2] N-MgI [9.48/13.6]?=0.0 log10, MgI VP column density,
(2)
94- 99 F6.3 [cm-2] e_N-MgI [-1/10]?=0.0 Uncertainty in N-MgI (1)
101-105 F5.2 km/s b-MgI [0.39/32.4]?=0.0 Doppler b for MgI VP component
(2)
107-112 F6.3 km/s e_b-MgI [-1/10]?=0.0 Uncertainty in b-MgI (1)
114-118 F5.2 [cm-2] N-MnII [9.53/13.4]?=0.0 log10, MnII VP column density
(2)
120-125 F6.3 [cm-2] e_N-MnII [-1/10]?=0.0 Uncertainty in N-MnII (1)
127-131 F5.2 km/s b-MnII [0.39/29.9]?=0.0 Doppler b for MnII VP component
(2)
133-138 F6.3 km/s e_b-MnII [-1/10]?=0.0 Uncertainty in b-MnII (1)
140-144 F5.2 [cm-2] N-CaII [9.65/12.3]?=0.0 log10, CaII VP column density
(2)
146-151 F6.3 [cm-2] e_N-CaII [-1/10]?=0.0 Uncertainty in N-CaII (1)
153-157 F5.2 km/s b-CaII [0.81/27.3]?=0.0 Doppler b for CaII VP component
(2)
159-163 F5.3 km/s e_b-CaII [0.03/10]?=0.0 Uncertainty in b-CaII (1)
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Note (1): Uncertainty flags -- Lower limits on column densities for ion X
indicated by uncertainties that are equal to -1.0. Unconstrained
column density or Doppler b for ion X are indicated by uncertainties set
equal to 9.999. For entries with no data the uncertainties are set to zero.
Note (2): Entries with no data have their values set to zero.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 03-Mar-2022