The WISSH quasars project

Bischetti, M.; Piconcelli, E.; Vietri, G.; Bongiorno, A.; Fiore, F.; Sani, E.; Marconi, A.; Duras, F.; Zappacosta, L.; Brusa, M.; Comastri, A.; Cresci, G.; Feruglio, C.; Giallongo, E.; Franca, F. La; Mainieri, V.; Mannucci, F.; Martocchia, S.; Ricci, F.; Schneider, Raffaella; Testa, V.; Vignali, C.

doi:10.1051/0004-6361/201629301

Cited by 185 publications

(232 citation statements)

References 76 publications

Supporting

Mentioning

214

Contrasting

Order By: Relevance

“…Information about optical rest-frame spectral properties are also reported since 14 out of 41 X-WISSH sources, i.e. ∼ 35% of the sample, have available LBT/LUCI spectroscopy (Bischetti et al 2017;Vietri et al in prep. ) In the right panel of Fig.…”

Section: The X-ray-to-optical Flux Ratio (X/o)mentioning

confidence: 99%

“…Accordingly, we are able to study the behaviour of k Bol,X as a function of M BH and Eddington ratio (λ EDD = L Bol /L EDD ). The SMBH mass for 14 out of 41 objects (∼ 35% of X-WISSH) are estimated from Hβ lines (Bischetti et al 2017;Vietri et al in prep. ), while the remaining ones are calculated from CIV lines (Weedman et al 2012).…”

Section: X-ray Bolometric Corrections and Eddington Ratiosmentioning

confidence: 99%

“…and at larger galaxy-wide scales as massive [OIII] outflows ( 2000 M yr −1 ; Bischetti et al 2017). We can envisage a program to follow-up these two categories and investigate the link between the UFOs and their outflow manifestations.…”

Section: Future Perspective With Athenamentioning

confidence: 99%

“…This sample has been obtained by cross-correlating the WISE All-Sky source catalog (for 22µm flux density S ν (22µm) > 3 mJy) and the SDSS DR7 quasar catalog (for 1.5 < z < 5). We refer to Bischetti et al (2017) for a detailed description of the WISSH quasar sample and the main goals of this multi-band project aimed at performing a systematic study of the nuclear, outflows and host galaxy properties of the most powerful quasars. This paper has been organized as follows.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The WISSH quasars project

Martocchia

Piconcelli

Zappacosta

et al. 2017

A&A

Self Cite

126

View full text Add to dashboard Cite

We perform a survey of the X-ray properties of 41 objects from the WISE/SDSS selected Hyper-luminous (WISSH) quasars sample, which includes 86 broad-line quasars with bolometric luminosity L Bol > ∼ 2 × 10 47 erg s −1 shining at z ∼ 2-4. We use both proprietary and archival Chandra and XMM-Newton observations. Twenty-one quasars have sufficient quality data to perform a spectroscopic analysis, while for the remaining sources, X-ray properties are derived through hardness-ratio analysis (apart for six sources which result to be undetected). The bulk (∼ 70%) of the detected WISSH quasars exhibit N H < 5 × 10 22 cm −2 , in agreement with their optical Type 1 AGN classification. All but three quasars show unabsorbed 2-10 keV luminosities L 2−10 ≥ 10 45 erg s −1 . Thanks to their extreme radiative output across the Mid-IR-to-X-ray range, WISSH quasars therefore offer the opportunity to significantly extend and validate the existing relations involving L 2−10 . Specifically, we study the X-ray luminosity as a function of (i) X-ray-to-Optical (X/O) flux ratio, (ii) mid-IR luminosity (L MIR ), (iii) L Bol as well as (iv) α OX versus the 2500Å luminosity. We find that the WISSH quasars show (i) unreported very low X/O (< 0.1) compared to typical AGN values; (ii) L 2−10 /L MIR ratios significantly smaller than those derived for AGN with lower luminosity; (iii) a large X-ray bolometric correction k Bol,X ≈ 100-1000; and (iv) steep -2 > ∼ α OX > ∼ -1.7. These results lead to a scenario in which the X-ray emission of hyper-luminous quasars is relatively weaker compared to lower-luminosity AGN. Models predict that such an X-ray weakness can be relevant for the acceleration of powerful high-ionization emission line-driven winds, commonly detected in the UV spectra of WISSH quasars, which can in turn perturb the X-ray corona and weaken its emission. Accordingly, hyper-luminous quasars represent the ideal laboratory to study the link between the AGN energy output and wind acceleration. Additionally, WISSH quasars exhibit very large SMBH masses (log[M BH /M ] > ∼ 9.5). This enables a more robust modeling of the Γ-M BH relation by increasing the statistics at high masses. We derive a flatter Γ dependence than previously found over the broad range 5 < ∼ log(M BH /M ) < ∼ 11. Finally, we estimate that only 300 ks observation of X-IFU on board Athena will offer a detailed view of the properties of absorption features associated to powerful X-ray SMBH winds for a representative sample of WISSH quasars.

show abstract

Section: The X-ray-to-optical Flux Ratio (X/o)mentioning

confidence: 99%

Section: X-ray Bolometric Corrections and Eddington Ratiosmentioning

confidence: 99%

Section: Future Perspective With Athenamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The WISSH quasars project

Martocchia

Piconcelli

Zappacosta

et al. 2017

A&A

Self Cite

126

View full text Add to dashboard Cite

show abstract

“…The IR luminosities of the 36 IR-bright DOG sample are log L IR [L ⊙ ] = 10.5 -13.1, and 25/36 (∼ 69 %) objects are classified as ULIRGs/HyLIRGs (see Table 1). Recently some authors have discovered many (obscured) ULIRGs/HyLIRGs based on the SDSS and WISE data and reported powerful ionized outflows seen in their spectra (Ross et al 2015;Zakamska et al 2016;Bischetti et al 2017;Hamann et al 2017;Zhang et al 2017), although they basically focus on high-z (z > 2) objects.…”

Section: Data and Analysismentioning

confidence: 99%

Ionized Gas Outflows in Infrared-bright Dust-obscured Galaxies Selected with WISE and SDSS

Toba

Bae

Nagao

et al. 2017

ApJ

View full text Add to dashboard Cite

We present the ionized gas properties of infrared (IR)-bright dust-obscured galaxies (DOGs) that show an extreme optical/IR color, (i − [22]) AB > 7.0, selected with the Sloan Digital Sky Survey (SDSS) and Wide-field Infrared Survey Explorer (WISE). For 36 IR-bright DOGs that show [O iii]λ5007 emission in the SDSS spectra, we performed a detailed spectral analysis to investigate their ionized gas properties. In particular, we measured the velocity offset (the velocity with respect to the systemic velocity measured from the stellar absorption lines) and the velocity dispersion of the [O iii] line. We found that the derived velocity offset and dispersion of most IR-bright DOGs are larger than those of Seyfert 2 galaxies (Sy2s) at z < 0.3, meaning that the IR-bright DOGs show relatively strong outflows compared to Sy2s. This can be explained by the difference of IR luminosity contributed from active galactic nucleus, L IR (AGN), because we found that (i) L IR (AGN) correlates with the velocity offset and dispersion of [O iii] and (ii) our IR-bright DOGs sample has larger L IR (AGN) than Sy2s. Nevertheless, the fact that about 75% IR-bright DOGs have a large (> 300 km s −1 ) velocity dispersion, which is a larger fraction compared to other AGN populations, suggests that IRbright DOGs are good laboratories to investigate AGN feedback. The velocity offset and dispersion of [O iii] and [Ne iii]λ3869 are larger than those of [O ii]λ3727, which indicates that the highly ionized gas tends to show more stronger outflows.

show abstract

X‐HESS: A large sample of highly accreting serendipitous AGN under the XMM‐Newton microscope

et al. 2023

Self Cite

View full text Add to dashboard Cite

The bulk of X-ray spectroscopic studies of active galactic nuclei (AGN) are focused on local (z < 0.1) sources with low-to-moderate (<0.3) Eddington ratio (𝜆 Edd ). It is then mandatory to overcome this limitation and improve our understanding of highly accreting AGN. In this work, we present the preliminary results from the analysis of a sample of ∼ 70 high-𝜆 Edd radio-quiet AGN at 0.06 ≤ z ≤ 3.3, based on the 10th release of the XMM-Newton serendipitous source catalog, that we named as XMM-Newton High-Eddington Serendipitous AGN Sample (X-HESS). Almost ∼ 35% of the X-HESS AGN have multi-epoch archival observations and ∼ 70% of the sources can rely on simultaneous OM optical data. First results reveal sources showing signatures of ultra-fast outflows and remarkable long-and short-term X-ray flux variations. Indeed in SDSS J095847.88+690532.7 (z ∼ 1.3), one of the most densely monitored objects hosting a ∼ 10 9 M ⊙ supermassive black hole, we discovered a variation of the soft X-ray flux by a factor of >2 over approximately one week (rest-frame). Large variations in the power-law continuum photon index Γ are also observed, questioning expectations from previously reported Γ − 𝜆 Edd relations, for which Γ ≥ 2 would be a ubiquitous hallmark of AGN with 𝜆 Edd ∼ 1.

show abstract

The WISSH quasars project

Cited by 185 publications

References 76 publications

The WISSH quasars project

The WISSH quasars project

Ionized Gas Outflows in Infrared-bright Dust-obscured Galaxies Selected with WISE and SDSS

X‐HESS: A large sample of highly accreting serendipitous AGN under the XMM‐Newton microscope

Contact Info

Product

Resources

About