2004A&A...414...79E


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.11CET01:43:48

2004A&A...414...79E - Astronomy and Astrophysics, volume 414, 79-93 (2004/1-4)

The sizes and kinematic structure of absorption systems towards the lensed quasar APM08279+5255.

ELLISON S.L., IBATA R., PETTINI M., LEWIS G.F., ARACIL B., PETITJEAN P. and SRIANAND R.

Abstract (from CDS):

We have obtained spatially resolved spectra of the zem=3.911 triply imaged QSO APM08279+5255 using the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope (HST). We study the line of sight equivalent width (EW) differences and velocity shear of high and low ionization absorbers (including a damped Lyman alpha [DLA] system identified in a spatially unresolved ground based spectrum) in the three lines of sight. The combination of a particularly rich spectrum and three sight-lines allow us to study 27 intervening absorption systems over a redshift range 1.1<zabs<3.8, probing proper transverse dimensions of 30h70–1pc up to 2.7h70–1kpc. We find that high ionization systems (primarily C IV absorbers) do not exhibit strong EW variations on scales <0.4h70–1kpc; their fractional EW differences are typically less than 30%. When combined with previous work on other QSO pairs, we find that the fractional variation increases steadily with separation out to at least ∼100h70–1kpc. Conversely, low ionization systems (primarily Mg II absorbers) show strong variations (often >80%) over kpc scales. A minimum radius for strong (EW>0.33) Mg II systems of >1.4h70–1kpc is inferred from absorption coincidences in all lines of sight. For weak Mg II absorbers (EW<0.33), a maximum likelihood analysis indicates a most probable coherence scale of 2.0h70–1kpc for a uniform spherical geometry, with 95% confidence limits ranging between 1.5 and 4.4h70–1kpc. The weak Mg II absorbers may therefore represent a distinct population of smaller galaxies compared with the strong Mg II systems which we know to be associated with luminous galaxies whose halos extend over tens of kpc. Alternatively, the weak systems may reside in the outer parts of larger galaxies, where their filling factor may be lower. By cross-correlating spectra along different lines of sight, we infer shear velocities of typically less than 20km/s for both high and low ionization absorbers. Finally, for systems with weak absorption that can be confidently converted to column densities, we find constant N(C IV)/N(Si IV) across the three lines of sight. Similarly, the [Al/Fe] ratios in the zabs=2.974 DLA are consistent with solar relative abundances over a transverse distance of ∼0.35h70–1kpc.

Abstract Copyright:

Journal keyword(s): quasars: absorption lines - quasars: individual: APM 08279+5255 - galaxies: ISM - galaxies: kinematics and dynamics - gravitational lensing

Nomenclature: Table 2: [EIP2004] QSO J0831+5245 abs N.NNN N=29, [EIP2004] NN (Nos 1-40).

Simbad objects: 33

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Number of rows : 33

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 JCMTSF J083141.3+524518 LeQ 08 31 41.64 +52 45 17.5           ~ 15 0
2 [ILI99] APM 08279+5255 C G 08 31 41.65 +52 45 17.6           ~ 13 1
3 [ILI99] APM 08279+5255 B LeQ 08 31 41.65 +52 45 17.8           ~ 12 0
4 [EIP2004] QSO J0831+5245 abs 3.134 ALS 08 31 41.7 +52 45 17           ~ 1 0
5 [EIP2004] QSO J0831+5245 abs 3.857 ALS 08 31 41.7 +52 45 17           ~ 1 0
6 [EIP2004] QSO J0831+5245 abs 3.893 ALS 08 31 41.7 +52 45 17           ~ 1 0
7 [EIP2004] QSO J0831+5245 abs 3.899 ALS 08 31 41.7 +52 45 17           ~ 1 0
8 [EIP2004] QSO J0831+5245 abs 3.912 ALS 08 31 41.7 +52 45 17           ~ 1 0
9 [EIP2004] QSO J0831+5245 abs 3.913 ALS 08 31 41.7 +52 45 17           ~ 1 0
10 [EIP2004] QSO J0831+5245 abs 3.917 ALS 08 31 41.7 +52 45 17           ~ 1 0
11 [EIP2004] QSO J0831+5245 abs 1.209 ALS 08 31 41.7 +52 45 17           ~ 1 0
12 [EIP2004] QSO J0831+5245 abs 1.211 ALS 08 31 41.7 +52 45 17           ~ 1 0
13 [EIP2004] QSO J0831+5245 abs 1.291 ALS 08 31 41.7 +52 45 17           ~ 1 0
14 [EIP2004] QSO J0831+5245 abs 1.444 ALS 08 31 41.7 +52 45 17           ~ 1 0
15 [EIP2004] QSO J0831+5245 abs 1.550 ALS 08 31 41.7 +52 45 17           ~ 1 0
16 [EIP2004] QSO J0831+5245 abs 2.042 ALS 08 31 41.7 +52 45 17           ~ 1 0
17 [EIP2004] QSO J0831+5245 abs 2.067 ALS 08 31 41.7 +52 45 17           ~ 1 0
18 [EIP2004] QSO J0831+5245 abs 3.109 ALS 08 31 41.7 +52 45 17           ~ 1 0
19 [EIP2004] QSO J0831+5245 abs 3.171 ALS 08 31 41.7 +52 45 17           ~ 1 0
20 [EIP2004] QSO J0831+5245 abs 3.203 ALS 08 31 41.7 +52 45 17           ~ 1 0
21 [EIP2004] QSO J0831+5245 abs 3.239 ALS 08 31 41.7 +52 45 17           ~ 1 0
22 [EIP2004] QSO J0831+5245 abs 3.379 ALS 08 31 41.7 +52 45 17           ~ 1 0
23 [EIP2004] QSO J0831+5245 abs 3.386 ALS 08 31 41.7 +52 45 17           ~ 1 0
24 [EIP2004] QSO J0831+5245 abs 3.502 ALS 08 31 41.7 +52 45 17           ~ 2 0
25 [EIP2004] QSO J0831+5245 abs 3.514 ALS 08 31 41.7 +52 45 17           ~ 1 0
26 [EIP2004] QSO J0831+5245 abs 3.558 ALS 08 31 41.7 +52 45 17           ~ 1 0
27 [EIP2004] QSO J0831+5245 abs 3.655 ALS 08 31 41.7 +52 45 17           ~ 1 0
28 [EIP2004] QSO J0831+5245 abs 1.813 ALS 08 31 41.70 +52 45 17.3           ~ 3 0
29 [EIP2004] QSO J0831+5245 abs 2.974 DLA 08 31 41.70 +52 45 17.3           ~ 7 0
30 [EIP2004] QSO J0831+5245 abs 1.062 DLA 08 31 41.70 +52 45 17.3           ~ 4 0
31 [EIP2004] QSO J0831+5245 abs 1.552 ALS 08 31 41.70 +52 45 17.3           ~ 2 0
32 [EIP2004] 1 DLA 08 31 41.70 +52 45 17.3           ~ 6 0
33 QSO J0831+5245 QSO 08 31 41.7095363198 +52 45 17.620340544   19.2   14.5 13.9 ~ 474 1

    Equat.    Gal    SGal    Ecl

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2019.12.11-01:43:48

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