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J/ApJ/679/962     Quasars with strong nitrogen emission lines     (Jiang+, 2008)

A sample of quasars with strong nitrogen emission lines from the Sloan Digital Sky Survey. Jiang L., Fan X., Vestergaard M. <Astrophys. J., 679, 962-966 (2008)> =2008ApJ...679..962J
ADC_Keywords: QSOs ; Line Profiles Keywords: galaxies: active - quasars: emission lines - quasars: general Abstract: We report on 293 quasars with strong NIV] λ1486 or NIII] λ1750 emission lines (rest-frame equivalent width >3Å) at 1.7<z<4.0 selected from the Sloan Digital Sky Survey (SDSS) Fifth Data Release (Cat. VII/252). These nitrogen-rich (N-rich) objects comprise ∼1.1% of the SDSS quasars. The comparison between the N-rich quasars and other quasars shows that the two quasar subsets share many common properties. We also confirm previous results that N-rich quasars have much stronger Lyα and NV λ1240 emission lines. Strong nitrogen emission in all ionization states indicates high overall nitrogen abundances in these objects. We find evidence that the nitrogen abundance is closely related to quasar radio properties. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 90 293 SDSS DR5 N-rich quasar catalog
See also: VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010) J/ApJ/613/129 : Equivalent widths of QSOs (Wise+, 2004) J/MNRAS/354/L31 : SDSS DR2 QSO and DLA properties (Murphy+, 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [SDSS] 6- 24 A19 --- SDSS Quasar identification ( 26- 30 F5.3 --- z SDSS redshift 32- 36 F5.2 mag imag SDSS i band magnitude, corrected for Galactic extinction. 38- 42 F5.2 --- alpha Power-law continuum slope 44- 46 F3.1 0.1nm [NIV] ? [NIV] (1486) equivalent width 48- 51 F4.1 0.1nm [NIII] ? [NIII] (1750) equivalent width 53- 56 F4.1 0.1nm SiIV ? SiIV (1396) equivalent width 58- 62 F5.1 0.1nm CIV ? CIV (1549) equivalent width 64- 67 F4.1 0.1nm [CIII] ? [CIII] (1909) equivalent width 69- 72 F4.1 0.1nm MgII ? MgII (2800) equivalent width 74- 76 F3.1 --- Fe/Mg ? The FeII/MgII ratio 78- 83 F6.2 mag 2500MAG Absolute AB mag at rest-frame 2500Å 85- 90 F6.1 --- R ? Radio loudness (2)
Note (2): Defined by f(6cm)/f(2500), where f(6cm) is the observed flux density at rest-frame 6cm derived from FIRST (if detected) assuming a power-law slope of -0.5 and f(2500) is the monochromatic flux density at rest-frame 2500Å.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 11-Oct-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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