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J/ApJ/683/L115         Intermediate-line region in quasars           (Hu+, 2008)

Hβ profiles in quasars: evidence for an intermediate-line region. Hu C., Wang J.-M., Ho L.C., Chen Y.-M., Bian W.-H., Xue S.-J. <Astrophys. J., 683, L115-L118 (2008)> =2008ApJ...683L.115H
ADC_Keywords: Equivalent widths ; Line Profiles ; Redshifts ; QSOs Keywords: galaxies: nuclei - galaxies: Seyfert - line: profiles - quasars: emission lines - quasars: general Abstract: We report on a systematic investigation of the Hβ and FeII emission lines in a sample of 568 quasars within z<0.8 selected from the Sloan Digital Sky Survey quasar catalog (DR5, Cat. VII/252). The conventional broad Hβ emission line can be decomposed into two components: one with intermediate velocity width and another with very broad width. The velocity shift and equivalent width of the intermediate-width component do not correlate with those of the very broad component of Hβ, but its velocity shift and width do resemble FeII. Moreover, the width of the very broad component is roughly 2.5 times that of the intermediate-width component. These characteristics strongly suggest the existence of an intermediate-line region, whose kinematics seem to be dominated by infall, located at the outer portion of the broad-line region. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 145 568 Line measurements
See also: VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010) J/ApJ/674/668 : SDSS J102839.11+450009.4 Fe II emission lines (Wang+, 2008) J/ApJ/687/78 : FeII emission in quasars (Hu+, 2008) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 18 A18 --- SDSS SDSS DR5 designation ( 20- 24 F5.3 --- z Redshift determined using the peak of [OIII]5007 26- 30 F5.1 0.1nm EW(Fe) EW of FeII lines between 4434 & 4686Å (1) 32- 34 F3.1 0.1nm e_EW(Fe) Error in EW(Fe) (1) 36- 41 F6.1 km/s W(Fe) FeII FWHM 43- 48 F6.1 km/s e_W(Fe) Error in W(Fe) 50- 56 F7.1 km/s v(Fe) FeII velocity shift with respect to [OIII]5007 (2) 58- 62 F5.1 km/s e_v(Fe) Error in v(Fe) 64- 67 F4.1 0.1nm EW(HbI) EW of Hβ intermediate-width component (1) 69- 72 F4.1 0.1nm e_EW(HbI) Error in EW(HbIC) (1) 74- 79 F6.1 km/s W(HbI) FWHM of Hβ intermediate-width component 81- 85 F5.1 km/s e_W(HbI) Error in W(HbIC) 87- 93 F7.1 km/s v(HbI) Hβ intermediate-width component velocity shift (2) 95- 99 F5.1 km/s e_v(HbI) Error in v(HbIC) 101-105 F5.1 0.1nm EW(HbVB) EW of Hβ very broad component (1) 107-110 F4.1 0.1nm e_EW(HbVB) Error in EW(HbVBC) (1) 112-118 F7.1 km/s W(HbVB) FWHM of Hβ very broad component 120-125 F6.1 km/s e_W(HbVB) Error in W(HbVBC) 127-133 F7.1 km/s v(HbVB) Hβ very broad component velocity shift (2) 135-139 F5.1 km/s e_v(HbVB) Error in v(HbVBC) 141-145 F5.3 --- chi2 Reduced χ2 in the double-Gaussian model
Note (1): In units of Angstroms. All EW measurements refer to the continuum at 5100Å. Note (2): Positive velocity indicates a redward shift.
History: From electronic version of the journal References: Hu et al. Paper I. 2008ApJ...687...78H Cat J/ApJ/687/78.
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 25-Nov-2010
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