VLT + UVES spectroscopy of the low-ionization intrinsic absorber in SDSS J001130.56+005550.7

Hutsemékers, Damien; Brinkmann, J.

doi:10.1051/0004-6361:20031688

Cited by 12 publications

(10 citation statements)

References 41 publications

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“…Assuming homogeneous partial coverage (Hamann & Sabra 2003), we find from these intensities that the covering factor of the absorption region is around 20% (see e.g. the relations given in Hutsemékers et al 2004). This suggests that the absorption is intrinsic to the quasar, and exterior to the BLR.…”

Section: The Intrinsic Absorption Linesmentioning

confidence: 68%

Multi-wavelength study of the gravitational lens system RXS J1131-1231

Sluse

Claeskens

Hutsemékers

et al. 2007

A&A

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Aims. We discuss and characterize micro-lensing among the 3 brightest lensed images (A-B-C) of the gravitational lens system RXS J1131-1231 (a quadruply imaged AGN) by means of long slit optical and NIR spectroscopy. Qualitative constraints on the size of different emission regions are derived. We also perform a spectroscopic study of two field galaxies located within 1.6 arcmin radius from the lens. Methods. We decompose the spectra into their individual emission components using a multi-component fitting approach. A complementary decomposition of the spectra enables us to isolate the macro-lensed fraction of the spectra independently of any spectral modelling.Results. 1. The data support micro-lensing de-amplification of images A and C. Not only is the continuum emission microlensed in those images but also a fraction of the Broad Line emitting Region (BLR).2. Micro-lensing of a very broad component of Mg ii emission line suggests that the corresponding emission occurs in a region more compact than the other components of the emission line.3. We find evidence that a large fraction of the Fe ii emission arises in the outer parts of the BLR. We also find a very compact emitting region in the ranges 3080-3540 Å and 4630-4800 Å that is likely associated with Fe ii. 4. The [O iii] narrow emission line regions are partly spatially resolved. This enables us to put a lower limit of ∼110h −1 pc on their intrinsic size.5. Analysis of Mg ii absorption found in the spectra indicates that the absorbing medium is intrinsic to the quasar, has a covering factor of 20%, and is constituted of small clouds homogeneously distributed in front of the continuum and BLRs. 6. Two neighbour galaxies are detected at redshifts z = 0.10 and z = 0.289. These galaxies are possible members of galaxy groups reported at those redshifts.

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Section: The Intrinsic Absorption Linesmentioning

confidence: 68%

Multi-wavelength study of the gravitational lens system RXS J1131-1231

Sluse

Claeskens

Hutsemékers

et al. 2007

A&A

Self Cite

108

114

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“…3 and 5), shows evidence for partial covering. We estimate a covering factor of ∼70% from the C iv doublet ratio using formulae given in Hutsemékers et al (2004). Finally, although the data are of lesser quality, the spectra obtained in 2015 ( Fig.…”

Section: Implications For the Quasar Structurementioning

confidence: 99%

Spatially separated continuum sources revealed by microlensing in the gravitationally lensed broad absorption line quasar SDSS J081830.46+060138.0

Hutsemékers

Sluse

Kumar

2020

A&A

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Gravitational microlensing is a powerful tool for probing the inner structure of distant quasars. In this context, we have obtained spectropolarimetric observations of the two images of the broad absorption line (BAL) quasar SDSS J081830.46+060138.0 (J0818+0601) at redshift z ≃ 2.35. We first show that J0818+0601 is actually gravitationally lensed, and not a binary quasar. A strong absorption system detected at z = 1.0065±0.0002 is possibly due to the lensing galaxy. Microlensing is observed in one image and it magnifies the emission lines, the continuum, and the BALs differently. By disentangling the part of the spectrum that is microlensed from the part that is not microlensed, we unveil two sources of continuum that must be spatially separated: a compact one, which is microlensed, and an extended one, which is not microlensed and contributes to two thirds of the total continuum emission. J0818+0601 is the second BAL quasar in which an extended source of rest-frame ultraviolet continuum is found. We also find that the images are differently polarized, suggesting that the two continua might be differently polarized. Our analysis provides constraints on the BAL flow. In particular, we find that the outflow is seen with a nonzero onset velocity, and stratified according to ionization. ⋆ Based on observations made with ESO Very Large Telescope at the Paranal Observatory under program ID 100.B-0590. The reduced spectra are available at the CDS via anonymous ftp to

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“…The most reliable results based on BAL column densities suggest metallicity ranges between solar and ten times solar (Arav et al 2001). Previous studies of NALs in low‐redshift samples have found super‐solar metallicities and highly ionized gas, and have successfully probed several other NAL outflow characteristics (Hamann & Ferland 1999; Ganguly et al 2003; D’Odorico et al 2004; Hutsemékers, Hall & Brinkmann 2004; Ganguly et al 2006; Gabel, Arav & Kim 2006). These lower redshift samples cover a wide range of luminosities, observed in the UV spectral range, where many useful metal and hydrogen lines occur.…”

Section: Introductionmentioning

confidence: 99%

The origins of a rich absorption line complex in a quasar at redshift 3.45

Simon¹,

Hamann

2010

Monthly Notices of the Royal Astronomical Society

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We discuss the nature and origin of a rich complex of narrow absorption lines in the quasar J102325.31+514251.0 at redshift 3.447. We measure nine C IV(λλ1548, 1551) absorption line systems with velocities from −1400 to −6200 km s −1 , and full widths at half-minimum ranging from 16 to 350 km s −1 . We also detect other absorption lines in these systems, including H I, C III, N V, O VI and Si IV. Lower ionization lines are not present, indicating a generally high degree of ionization in all nine systems. The total hydrogen column densities range from 10 17.2 to 10 19.1 cm −2 . The tight grouping of these lines in the quasar spectrum suggests that most or all of the absorbing regions are physically related. We examine several diagnostics to estimate more directly the location and origin of each absorber. Four of the systems can be attributed to a quasar-driven outflow based on line profiles that are smooth and broad compared to thermal linewidths and to the typical absorption lines formed in intergalactic gas or galaxy haloes. Several systems also have other indicators of a quasar outflow origin, including partial covering of the quasar emission source (e.g. in systems with speeds too high for a starburstdriven flow), O VI column densities above 10 15 cm −2 and an apparent line-lock in C IV (in two of the narrow profile systems). A search for line variability yielded null results, although with very poor constraints because the comparison spectra have much lower resolution. Altogether (but not including the tentative line-lock) there is direct evidence for six of the nine systems forming in a quasar outflow. Consistent with a near-quasar origin, eight of the systems have metallicity values or lower limits in the range Z 1-8 Z . The lowest velocity system, which has an ambiguous location based on the diagnostics mentioned above, also has the lowest metallicity, Z 0.3 Z , and might form in a non-outflow environment farther from the quasar. Overall, however, this complex of narrow absorption lines can be identified with a highly structured, multicomponent outflow from the quasar. The high metallicities are similar to those derived for other quasars at similar redshifts and luminosities, and are consistent with evolution scenarios wherein quasars appear after the main episodes of star formation and metal enrichment in the host galaxies.

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VLT + UVES spectroscopy of the low-ionization intrinsic absorber in SDSS J001130.56+005550.7

Cited by 12 publications

References 41 publications

Multi-wavelength study of the gravitational lens system RXS J1131-1231

Multi-wavelength study of the gravitational lens system RXS J1131-1231

Spatially separated continuum sources revealed by microlensing in the gravitationally lensed broad absorption line quasar SDSS J081830.46+060138.0

The origins of a rich absorption line complex in a quasar at redshift 3.45

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