2002ApJ...567...68W

Query : 2002ApJ...567...68W

2002ApJ...567...68W - Astrophys. J., 567, 68-72 (2002/March-1)

The metallicity of the redshift 4.16 quasar BR 2248-1242.

WARNER C., HAMANN F., SHIELDS J.C., CONSTANTIN A., FOLTZ C.B. and CHAFFEE F.H.

Abstract (from CDS):

We estimate the metallicity in the broad emission line region of the redshift z=4.16 quasar BR 2248-1242 by comparing line ratios involving nitrogen to theoretical predictions. BR 2248-1242 has unusually narrow emission lines with large equivalent widths, thus providing a rare opportunity to measure several line-ratio abundance diagnostics. The combined diagnostics indicate a metallicity of ∼2 times solar. This result suggests that an episode of vigorous star formation occurred near BR 2248-1242 prior to the observed z=4.16 epoch. The time available for this enrichment episode is only ∼1.5 Gyr at z=4.16 (for H0=65 km.s–1.Mpc–1, Ωm=0.3, and ΩΛ≲1). This evidence for high metallicities and rapid star formation is consistent with the expected early-epoch evolution of dense galactic nuclei.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Active - Galaxies: Formation - Galaxies: Quasars: Emission Lines - Galaxies: Quasars: Individual: Alphanumeric: BR 2248-1242

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 QSO B2248-1244 QSO 22 51 18.1049437608 -12 27 03.295641708     18.5     ~ 31 0

Query : 2002ApJ...567...68W

Basic data :
QSO B2248-1244 -- Quasar
Other object types: otypes_help 		QSO (2010A&A,QSO,...), * (Gaia)
ICRS coord. (ep=J2000) : 		22 51 18.1049437608 -12 27 03.295641708 (Optical) [ 0.2874 0.2911 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		22 48 39.8478431022 -12 42 59.239302145 [ 0.2874 0.2911 90 ]
Gal coord. (ep=J2000) : 		054.5402885160275 -58.2855175552123 [ 0.2874 0.2911 90 ]
Proper motions mas/yr : 		0.095 0.261 [0.379 0.334 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 277925 [~] / z(emission) 4.14 [~] / cz 1241141 [~]
   D 2015ApJ...806..109J
Fluxes (2) :
V 18.5 [~] E ~
G 19.217392 [0.005065] C 2020yCat.1350....0G
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Identifiers (13) :
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QSO B2248-1244 KODIAQ J225118-122703 [VV2006] J225118.1-122703 Gaia DR3 2603603750292410240
BR B2248-1242 QSO J2251-1227 [VV2010] J225118.1-122703
BR B2248-1244 [VV2000] J225118.1-122703 [VV98] J225118.1-122703
BR B2248-12 [VV2003] J225118.1-122703 Gaia DR2 2603603750292410240

References (31 between 1850 and 2026) (Total 31)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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