2014MNRAS.438..476P

Query : 2014MNRAS.438..476P

2014MNRAS.438..476P - Mon. Not. R. Astron. Soc., 438, 476-486 (2014/February-2)

Towards a unified description of the intergalactic medium at redshift z ∼ 2.5.

PROCHASKA J.X., MADAU P., O'MEARA J.M. and FUMAGALLI M.

Abstract (from CDS):

We examine recent measurements of the z ~ 2.5 intergalactic medium (IGM) which constrain the H i frequency distribution f(N_H I) and the mean free path λ_mfp^912 to ionizing radiation. We argue that line-blending and the clustering of strong absorption-line systems have led previous authors to systematically overestimate the effective Lyman limit opacity, yielding too small of a λ_mfp^912 for the IGM. We further show that recently published measurements of f(N_H I) at N_H I~10^16   cm^-2 lie in strong disagreement, implying underestimated uncertainty from sample variance and/or systematics like line-saturation. Allowing for a larger uncertainty in the f(N_H I) measurements, we provide a new cubic Hermite spline model for f(N_H I) which reasonably satisfies all of the observational constraints under the assumption of randomly distributed absorption systems. We caution, however, that this formalism is invalid in the light of absorber clustering and use a toy model to estimate the effects. Future work must properly account for the non-Poissonian nature of the IGM.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): intergalactic medium

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 J1551+1911 QSO 15 51 52.4688797112 +19 11 04.014875400           ~ 66 0

Query : 2014MNRAS.438..476P

Basic data :
QSO J1551+1911 -- Quasar
Other object types: otypes_help 		QSO (2012A&A,QSO,...), G (2019MNRAS,[LCS2019]), * (Gaia), smm (2019MNRAS), NIR (2MASS), Opt (SDSS)
ICRS coord. (ep=J2000) : 		15 51 52.4688797112 +19 11 04.014875400 (Optical) [ 0.0302 0.0261 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		15 49 38.4223316502 +19 19 59.636354661 [ 0.0302 0.0261 90 ]
Gal coord. (ep=J2000) : 		031.9486951672726 +47.9940704266612 [ 0.0302 0.0261 90 ]
Proper motions mas/yr : 		0.074 0.061 [0.037 0.035 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 261769 [~] / z(emission) 2.843 [~] / cz 852310 [~]
   (Opt) C 2017AJ....154..114O
Fluxes (9) :
G 15.868393 [0.002886] C 2020yCat.1350....0G
J 14.417 [0.031] C 2003yCat.2246....0C
H 14.024 [0.045] C 2003yCat.2246....0C
K 13.641 [0.034] C 2003yCat.2246....0C
u (AB) 17.0400 [0.0260] C 2020ApJS..250....8L
g (AB) 16.0449 [0.0142] C 2020ApJS..250....8L
r (AB) 15.8685 [0.0171] C 2020ApJS..250....8L
i (AB) 15.7446 [0.0151] C 2020ApJS..250....8L
z (AB) 15.6536 [0.0147] C 2020ApJS..250....8L
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Identifiers (11) :
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QSO J1551+1911 2MASS J15515248+1911042 SDSS J155152.46+191104.0 Gaia DR2 1203704618098140672
HS 1549+1919 QSO B1549+1919A TIC 422975273 Gaia DR3 1203704618098140672
KODIAQ J155152+191104 SDSS J155152.46+191104.1 [LCS2019] 1549.1 3

References (66 between 1850 and 2026) (Total 66)
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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Velocities : 9    PM : 2   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : QSO J1551+1911

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2MASS J15515248+1911042 SDSS J155152.46+191104.1 SDSS J155152.46+191104.0 Gaia DR2 1203704618098140672 Gaia DR3 1203704618098140672

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