Query : 2001A&A...373..816S

2001A&A...373..816S - Astronomy and Astrophysics, volume 373, 816-826 (2001/7-3)

A near-solar metallicity damped Lyman-α system toward the BAL quasar Tol 1037-2703.


Abstract (from CDS):

We report the detection of a Broad Absorption Line (BAL) outflow in the spectrum of the zem(Mg II)=2.201 QSO Tol 1037-2703 with three main BALs at 36000, 25300 and 22300km/s outflow velocities. Although the overall flow is dominated by high ionization lines like N V and C IV, the gas of highest velocity shows absorption from Mg I, Mg II and Fe II. Covering factor arguments suggest that the absorbing complexes are physically associated with the QSO and have transverse dimensions smaller than that of the UV continuum emitting region (r<0.1pc). We show that the C IV absorption at zabs=2.082 has a covering factor fc∼0.86 and the absorption profile has varied over the last four years. The detection of absorption from excited fine structure levels of C II and Si II in narrow components embedded in the C IV trough reveals large density inhomogeneities. IR pumping is the most likely excitation process. The zabs=2.139 system is a moderately damped Lyman-α system with log N(H I)∼19.7. The weakness of the metal lines together with the high quality of the data make the metallicity measurements particularly reliable. The absolute metallicity is close to solar with [Zn/H]=-0.26. The α-chain elements have metallicities consistently solar (respectively +0.05, -0.02, -0.03 and -0.15 for [Mg/H], [Si/H], [P/H] and [S/H]) and iron peak elements are depleted by a factor of about two ([Fe/Zn], [Cr/Zn], [Mn/Zn] and [Ni/Zn] are equal to -0.39, -0.27, -0.49, -0.30). Lines from C I are detected but H2 is absent with a molecular to neutral hydrogen fraction less than 8x10–6. From the ionization state of the gas, we argue that the system is situated ∼few Mpc away from the QSO. High metallicity and low nitrogen abundance, [N/Zn]=-1.40, favor the idea that metals have been released by massive stars during a starburst of less than 0.5Gyr of age. Using the upper limit on the C I* column density in two components, we obtain upper limits on the background temperature of 16.2 and 13.2K respectively.

Abstract Copyright:

Journal keyword(s): galaxies: intergalactic medium - galaxies: quasars: absorption lines

Nomenclature: Text: [SP2001] QSO J1039-2719 abs N.NNN N=2, [SP2001] QSO J1039-2719 abs N.NNNN N=3.

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 LBQS 0013-0029 QSO 00 16 02.4050159808 -00 12 25.077257064   18.67 18.36     ~ 188 0
2 QSO J0831+5245 QSO 08 31 41.7108197808 +52 45 17.616994560   19.2   14.5 13.9 ~ 518 1
3 QSO J1039-2719 QSO 10 39 21.8517992640 -27 19 16.435341732     17.4     ~ 88 0
4 PG 1101-264 QSO 11 03 25.2993421704 -26 45 15.808554720   16.08 16.02     ~ 241 0
5 QSO B1331+170 QSO 13 33 35.7827544072 +16 49 04.013500728   16.84 16.71 16.41   ~ 428 0
6 QSO J1759+2343 QSO 17 59 00.3579931800 +23 43 46.950464136     18.0 15.76   ~ 84 1

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