2002A&A...391....1A


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST21:30:37

2002A&A...391....1A - Astronomy and Astrophysics, volume 391, 1-12 (2002/8-3)

HST STIS observations of four QSO pairs.

ARACIL B., PETITJEAN P., SMETTE A., SURDEJ J., MUECKET J.P. and CRISTIANI S.

Abstract (from CDS):

We present HST STIS observations of four quasar pairs with redshifts 0.84<zem<1.56 and angular separation 2-3arcmin corresponding to ∼1-1.5h–150Mpc transverse proper distance at z∼0.9. We study the distribution of velocity differences between nearest neighbor HI Lyman-α absorption lines detected in the spectra of adjacent QSOs in order to search for the possible correlation caused by the extent or the clustering properties of the structures traced by the absorption lines over such a scale. The significance of the correlation signal is determined by comparison with Monte-Carlo simulations of spectra with randomly distributed absorption lines. We find an excess of lines with a velocity separation smaller than ΔV=500km/s significant at the 99.97% level. This clearly shows that the Lyman-α forest is correlated on scales larger than 1h–150Mpc at z∼1. However, out of the 20 detected coincidences within this velocity bin, 12 have Δ V>200km/s. This probably reflects the fact that the scale probed by our observations is not related to the real size of individual absorbers but rather to large scale correlation. Statistics are too small to conclude about any difference between pairs separated by either 2 or 3 arcmin. A damped Lyman-α system is detected at zabs=1.2412 toward LBQS 0019-0145A with log N(HI)∼20.5. From the absence of ZnII absorption, we derive a metallicity relative to solar [Zn/H]←1.75.

Abstract Copyright:

Journal keyword(s): quasars: absorption lines - galaxies: ISM - galaxies: halo

Simbad objects: 8

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Number of rows : 8

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 LBQS 0019-0145A QSO 00 21 51.6808901692 -01 28 34.080506815   18 18.1     ~ 15 0
2 LBQS 0019-0145B QSO 00 22 04.8913204625 -01 28 47.879110719   18 18.1     ~ 14 1
3 QSO B0035-3518 QSO 00 38 05.5739051411 -35 01 40.582221786   18.06 17.08     ~ 6 0
4 QSO B0035-3520 QSO 00 38 17.5197573576 -35 04 05.368410917   18.38 18.30     ~ 6 0
5 QSO B0037-3545 QSO 00 39 37.3346866919 -35 29 17.118750443   18.09 18.47     ~ 6 0
6 QSO B0037-3544 QSO 00 39 42.6231618178 -35 28 00.843216858   18.2 17.63 17.9   ~ 11 0
7 [VV96] J132239.4+473929 QSO 13 22 39.2947272967 +47 39 28.551637498   18.69 18.46     ~ 22 0
8 QSO B1320+4755B QSO 13 22 50.7041005866 +47 39 37.153567206   17.8 19.01 17.9   ~ 23 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-21:30:37

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