Keck HIRES Observations of the QSO FIRST J104459.6+365605: Evidence for a Large‐Scale Outflow

Kool, M. de; Arav, Nahum; Becker, R. H.; Gregg, Michael D.; White, R. L.; Laurent-Muehleisen, S. A.; Price, Trevor; Korista, K. T.

doi:10.1086/318996

Cited by 145 publications

(200 citation statements)

References 25 publications

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“…As recently claimed for associated absorption lines (e.g. Srianand & Petitjean 2000;de Kool et al 2001;Hamann et al 2001), the observed absorption systems could arise in gas expelled by a galactic "superwind" in a luminous starburst associated with the formation of the quasar itself. Superwinds contain cool dense clouds which justify the presence of low ionisation lines, embedded in a hot (∼10 7 K) X-ray-emitting plasma (see Heckman et al 1996, and references therein).…”

Section: Discussionsupporting

confidence: 52%

High matter density peaks from UVES observations of QSO pairs: Correlation properties and chemical abundances

D’Odorico

Petitjean

Cristiani

2002

A&A

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Abstract. We study the transverse clustering properties of high matter density peaks as traced by high column density absorption systems (either Lyman limit systems characterized by N(H ) ≥ 2 × 10 17 cm −2 or C  systems with W r > 0.5 Å) at redshifts between 2 and 3 with UVES spectra of two QSO pairs (UM680/UM681 at 56 arcsec angular separation and Q2344+1228/Q2343+1232 at 5 arcmin angular separation) and a QSO triplet (Q2139-4433/Q2139-4434/Q2138-4427 at 1, 7 and 8 arcmin angular separation). We find 3 damped Lyman-α systems (N(H ) ≥ 2 × 10 20 cm −2 ): 2 coinciding with strong metal systems in the nearby line of sight and 1 matching the emission redshift of the paired QSO; plus 7 Lyman limit systems: 4 forming two matching couples and 3 without a corresponding metal system within ∼3000 km s −1 in the coupled line of sight. In summary, we detect five out of ten matching systems within 1000 km s −1 , indicating a highly significant overdensity of strong absorption systems over separation lengths from ∼1 to 8 h −1 Mpc. The observed coincidences could arise in gas due to starburst-driven superwinds associated with a quasar or a galaxy, or gas belonging to large scale structures like filaments or sheets. We also determine chemical abundance ratios for three damped Lyman-α systems. In particular, for the damped system at z ∼ 2.53788 in the spectrum of Q2344+1228, new estimates of the ratios O/Fe, C/Fe are obtained: −0.02 < [C/Fe] < 0.06, −0.06 < [O/Fe] < 0.2. They indicate that O and C are not over-solar in this system.

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Section: Discussionsupporting

confidence: 52%

High matter density peaks from UVES observations of QSO pairs: Correlation properties and chemical abundances

D’Odorico

Petitjean

Cristiani

2002

A&A

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“…Velocity and ionization dependent partial covering is often seen in NALs Hamann et al 2001), and has also been reported for mini-BAL and BAL QSOs (Arav et al 1999;Srianand & Petitjean 2000;de Kool et al 2001de Kool et al , 2002bHall et al 2003). The partial covering proves the intrinsic nature of the absorbers.…”

Section: Discussionmentioning

confidence: 57%

“…Absorbers apparently can be found at large distances from the ionizing source in both RLQs and RQQs. (de Kool et al 2001). On the basis of excited Fe  lines and velocity correspondence between Fe  and Mg  lines, r ∼ 630 pc was found.…”

Section: Discussionmentioning

confidence: 80%

“…The usual problems of cloud (or density inhomogeneity) survival and confinement (e.g. Hamann et al 2001;de Kool et al 2001) are exacerbated by the requirement that such structures must survive for the time needed to reach such large distances. Also, if such outflows are seen in ∼10% of quasars, they cover somewhere between ∼10% of the unobscured lines of sight around all quasars and all such sightlines in ∼10% of quasars at distances of ∼10 kpc, implying outflows of very large masses (∼10 8 −10 9 M ; Hamann et al 2001).…”

Section: Discussionmentioning

confidence: 99%

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

Hutsemékers

Brinkmann²

2004

A&A

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Abstract. We analyse high-resolution VLT+UVES spectra of the low-ionization intrinsic absorber observed in the BAL QSO SDSS J001130.56+005550.7. Two narrow absorption systems at velocities −600 km s −1 and −22 000 km s −1 are detected. The low-velocity system is part of the broad absorption line (BAL), while the high-velocity one is well detached. While most narrow absorption components are only detected in the high-ionization species, the lowest velocity component is detected in both highand low-ionization species, including in the excited Si  and C  lines. From the analysis of doublet lines, we find that the narrow absorption lines at the low-velocity end of the BAL trough are completely saturated but do not reach zero flux, their profiles being dominated by a velocity-dependent covering factor. The covering factor is significantly smaller for Mg  than for Si  and N , which demonstrates the intrinsic nature of absorber. From the analysis of the excited Si  and C  lines in the lowest velocity component, we find an electron density 10 3 cm −3 . Assuming photoionization equilibrium, we derive a distance 20 kpc between the low-ionization region and the quasar core. The correspondence in velocity of the high-and low-ionization features suggests that all these species must be closely associated, hence formed at the same distance of ∼20 kpc, much higher than the distance usually assumed for BAL absorbers.

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“…For example, Lípari & Terlevich (2006) first proposed that Broad Absorption Line Quasars (BAL QSOs, e.g. Dunn et al 2010) may be objects in the transition phase between the ULIRGs and unobscured QSO phase, where the outflowing wind in the ionized component is seen directly in optical-UV spectra (e.g., de Kool et al 2001;Hamann et al 2002). Extensive works in the past years uniquely contributed to our understanding of the winds physics, in terms of spatial location, ionization level and energetics involved (see, e.g., Moe et al 2009;Borguet et al 2013 andArav et al 2013).…”

Section: Introductionmentioning

confidence: 99%

X-shooter reveals powerful outflows in z ∼ 1.5 X-ray selected obscured quasi-stellar objects

Brusa

Bongiorno

Cresci

et al. 2014

Monthly Notices of the Royal Astronomical Society

158

218

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We present X-shooter@VLT observations of a sample of 10 luminous, X-ray obscured QSOs at z∼ 1.5 from the XMM-COSMOS survey, expected to be caught in the transitioning phase from starburst to AGN dominated systems. The main selection criterion is X-ray detection at bright fluxes (L X > ∼ 10 44 erg s −1 ) coupled to red optical-to-NIR-to-MIR colors. Thanks to its large wavelength coverage, X-shooter allowed us to determine accurate redshifts from the presence of multiple emission lines for five out of six targets for which we had only a photometric redshift estimate, with a 80% success rate, significantly larger than what is observed in similar programs of spectroscopic follow-up of red QSOs. We report the detection of broad and shifted components in the [OIII]λλ5007,4959 complexes for 6 out of 8 sources with these lines observable in regions free from strong atmospheric absorptions. The FWHM associated with the broad components are in the range FWHM∼ 900 − 1600 km s −1 , larger than the average value observed in SDSS Type 2 AGN samples at similar observed [OIII] luminosity, but comparable to those observed for QSO/ULIRGs systems for which the presence of kpc scale outflows have been revealed through IFU spectroscopy. Although the total outflow energetics (inferred under reasonable assumptions) may be consistent with winds accelerated by stellar processes, we favour an AGN origin for the outflows given the high outflow velocities oberved (v> 1000 km s −1 ) and the presence of strong winds also in objects undetected in the far infrared.

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Keck HIRES Observations of the QSO FIRST J104459.6+365605: Evidence for a Large‐Scale Outflow

Cited by 145 publications

References 25 publications

High matter density peaks from UVES observations of QSO pairs: Correlation properties and chemical abundances

High matter density peaks from UVES observations of QSO pairs: Correlation properties and chemical abundances

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

X-shooter reveals powerful outflows in z ∼ 1.5 X-ray selected obscured quasi-stellar objects

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