1999ApJ...512L...5K

Query : 1999ApJ...512L...5K

1999ApJ...512L...5K - Astrophys. J., 512, L5-L8 (1999/February-2)

The detection of two distinct high ionization states in a QSO lyman-limit absorption system: evidence for hierarchical galaxy formation at z ∼ 3?.

KIRKMAN D. and TYTLER D.

Abstract (from CDS):

We have detected two high ionization phases of gas in the z∼2.77 partial Lyman-limit system (LLS) toward QSO 1157+3143. We detect the first phase by C IV and Si IV absorption and the second phase–which is either warmer or undergoing larger random bulk motions than the first–via O VI absorption. Both phases of gas are present in similar column density ratios in each of the five velocity components, making it appear that this LLS is constructed of five very similar building blocks. We find that this system displays some of the properties expected of a hierarchical merging event, although published models may have trouble explaining the Si IV absorption we observe. When different ions show similar velocity structure, we commonly assume that they arise in the same gas, and we compare their column densities to derive the ionization and abundances. For this one absorption system, the different ions have similar velocity, but they do not arise in the same gas.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Quasars: Absorption Lines - Galaxies: Quasars: Individual: Alphanumeric: 1157+3143

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 B1157+3143 QSO 12 00 06.2491993344 +31 26 30.837671952   16.76 16.47     ~ 72 0

Query : 1999ApJ...512L...5K

Basic data :
QSO B1157+3143 -- Quasar
Other object types: otypes_help 		QSO (2008ApJ,QSO,...), * (Gaia), blu (CSO), Rad (ILT), NIR (2MASS), MIR (WISEA), IR (2MASSI), Opt (SDSS)
ICRS coord. (ep=J2000) : 		12 00 06.2491993344 +31 26 30.837671952 (Optical) [ 0.0682 0.0528 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		11 57 32.2836431716 +31 43 12.872459268 [ 0.0682 0.0528 90 ]
Gal coord. (ep=J2000) : 		188.7903519170413 +78.0143321080915 [ 0.0682 0.0528 90 ]
Proper motions mas/yr : 		-0.024 0.075 [0.066 0.061 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 264339 [~] / z(emission) 2.989 [~] / cz 896080 [~]
   (Opt) C 2017AJ....154..114O
Fluxes (11) :
B 16.76 [~] D 2010A&A...518A..10V
V 16.47 [~] D 2010A&A...518A..10V
G 16.627880 [0.004234] C 2020yCat.1350....0G
J 15.324 [0.045] C 2010AJ....139.2360S
H 14.908 [0.062] C 2010AJ....139.2360S
K 14.508 [0.075] C 2010AJ....139.2360S
u (AB) 17.9810 [0.0184] C 2020ApJS..250....8L
g (AB) 16.6262 [0.0198] C 2020ApJS..250....8L
r (AB) 16.4170 [0.0184] C 2020ApJS..250....8L
i (AB) 16.3552 [0.0231] C 2020ApJS..250....8L
z (AB) 16.3398 [0.0186] C 2020ApJS..250....8L
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Identifiers (20) :
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QSO B1157+3143 2MASS J12000626+3126308 TIC 173047865 [VV2006] J120006.3+312630
CSO 118 2MASSI J1200062+312630 WISEA J120006.25+312630.8 [VV2010] J120006.3+312630
HS 1157+3143 QSO J1200+3126 [SSO2007] 180.026060+31.441907 [VV98] J120006.3+312630
ILT J120006.26+312631.1 SDSS J120006.25+312630.8 [VV2000] J120006.3+312630 Gaia DR3 4026640524148455680
KODIAQ J120006+312630 SDSS J120006.24+312630.8 [VV2003] J120006.3+312630 Gaia DR2 4026640524148455680

References (72 between 1850 and 2026) (Total 72)
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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Collections of Measurements Description of Measurements

Velocities : 13    PM : 2   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : QSO B1157+3143

Link by name to the catalogue in VizieR :

2MASS J12000626+3126308 2MASSI J1200062+312630 SDSS J120006.25+312630.8 SDSS J120006.24+312630.8 WISEA J120006.25+312630.8
Gaia DR3 4026640524148455680 Gaia DR2 4026640524148455680

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