A Catalog of Quasar Properties from the Baryon Oscillation Spectroscopic Survey

Chen, Zhi-Fu; Pan, Da-Sheng; Pang, Ting-Ting; Huang, Yong

doi:10.3847/1538-4365/aa9d90

Cited by 11 publications

(13 citation statements)

References 41 publications

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“…More recently, once the SDSS DR12 Quasar Catalog (Pâris et al 2017) was released, K17 followed using SDSS photometry as a proxy for monochromatic luminosities. Chen et al (2018) added a detailed analysis of continuum luminosities in the Hα, Hβ regions for low-redshift quasars. Using the spectra from the Chinese LAMOST survey, Dong et al (2018) also sought to estimate virial black hole masses, and the results, while consistent with Shen et al (2011), suffered from the necessity of pegging the noncalibrated spectra to the SDSS photometry, which was taken at a different epoch.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Improving Damped Random Walk Parameters for SDSS Stripe 82 Quasars with Pan-STARRS1

Suberlak

Ivezić

MacLeod

2021

ApJ

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We use the Panoramic Survey Telescope and Rapid Response System 1 Survey (Pan-STARRS1, PS1) data to extend the Sloan Digital Sky Survey (SDSS) Stripe 82 quasar light curves. Combining PS1 and SDSS light curves provides a 15 yr baseline for 9248 quasars -5 yr longer than prior studies that used only SDSS. We fit the light curves with the damped random walk (DRW) model model -a statistical description of their variability. We correlate the resulting DRW model parameters: asymptotic variability amplitude SF ∞ , and characteristic timescale τ , with quasar physical properties -black hole mass, bolometric luminosity, and redshift. Using simulated light curves, we find that a longer baseline allows us to better constrain the DRW parameters. After adding PS1 data, the variability amplitude is a stronger function of the black hole mass, and has a weaker dependence on quasar luminosity. In addition, the characteristic timescale τ dependence on quasar luminosity is marginally weaker. We also make predictions for the fidelity of DRW model parameter retrieval when light curves will be further extended with Zwicky Transient Facility (ZTF) and the Rubin Observatory Legacy Survey of Space and Time (LSST) data. Finally, we show how updated DRW parameters offer an independent method of discovering changing-look quasar candidates (CLQSOs). The candidates are outliers in terms of differences in magnitude and scatter between SDSS and PS1 segments. We identify 40 objects (35 newly reported) with tenfold increase in variability timescale between SDSS and SDSS-PS1 data, which is due to a large change in brightness (over 0.5 mag) -characteristic for CLQSOs.

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Section: Acknowledgmentsmentioning

confidence: 99%

Improving Damped Random Walk Parameters for SDSS Stripe 82 Quasars with Pan-STARRS1

Suberlak

Ivezić

MacLeod

2021

ApJ

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“…Therefore, a clustering distribution of absorption systems is often detected around the quasar emission redshift relative to the cosmological absorptions (e.g., Nestor et al 2008;Wild et al 2008;Chen et al 2015Chen et al , 2018a. We reanalyze the velocity distribution of Mg ii NALs included in Chen et al (2018a), after removing quasars with z em ≥ 1.07 so that the quasar redshifts can be better determined from emission lines (e.g., Chen et al 2018b). This cut reduces the number of Mg ii NALs from the 17 316 in Chen et al (2018a), leaving 6349 in the sample studied here.…”

Section: Data Sample and Spectral Analysismentioning

confidence: 99%

“…The Eddington ratios of the nine quasars with inflowing Mg ii NALs are shown. We calculate the Eddingtong ratios for all the quasars with z em < 1.07 included in Chen et al (2018a), where their black hole mass is available from previous works (e.g., Shen et al 2011;Chen et al 2018bChen et al , 2019. The results are shown in Figure 6, which includes 2724 quasars.…”

Section: Eddington Ratiosmentioning

confidence: 99%

Detections of inflowing gas from narrow absorption lines at parsec scales

Chen

et al. 2022

A&A

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The detection of inflows at the scale of the dusty torus and smaller is crucial for investigating the process of supermassive black hole (SMBH) accretion. However, only a few cases of inflowing gas at small scales have been reported through redshifted broad absorption lines so far. Here we report nine redshifted narrow absorption lines (NALs) of Mg + ions with inflowing speeds of 1071 -1979 km s −1 , which are likely along the directions close to the axes of accretion disks. The quasars showing inflowing Mg ii NALs have, on average, slightly smaller Eddington ratios than the sources with outflowing Mg ii NALs. The upper limits on the locations of the detected NALs are at parsec scale, that is, the distance from dusty tori to their central SMBHs. One possible origin of these infalling NALs is from dusty tori. However, these infalling NALs could also be naturally explained by chaotic cold accretion resulting from the nonlinear interaction of active galactic nucleus (AGN) jets with the interstellar medium (ISM), and these cold gaseous blobs may originally precipitate in metal-rich trailing outflows uplifted by AGN jet ejecta. The infalling NALs may therefore provide direct evidence for cold gas precipitation and accretion in AGN feedback processes, and provide direct evidence of inflowing gas along the directions close to quasar jets and at parsec scale. Regardless of whether these infalling NALs are from the dusty tori or the interaction of AGN jets with the ISM, the infalling NALs cannot provide sufficient fuel to power the quasars.

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“…Therefore, a clustering distribution of absorption systems is often detected around the quasar emission redshift relative to the cosmological absorptions (e.g., Nestor et al 2008;Wild et al 2008;Chen et al 2015Chen et al , 2018a. We reanalyze the velocity distribution of Mg ii NALs included in (Chen et al 2018a), after cutting their quasars with z em < 1.07 so that the quasar redshifts can be better determined from emission lines (e.g., Chen et al 2018b). This cut reduces the numbers of Mg ii NALs from 17, 316 of Chen et al (2018a) to 6349 of this paper.…”

Section: Data Sample and Spectral Analysismentioning

confidence: 99%

“…The Eddington ratios of the 9 quasars with inflowing Mg ii NALs are shown with red solid-line in Figure 6. We calculate the Eddingtong ratios for all the quasars with z em < 1.07, included in Chen et al (2018a), when their black hole mass can be available from previous works (e.g., Shen et al 2011;Chen et al 2018bChen et al , 2019. The results are shown with black solid-line in Figure 6, which includes 2724 quasars.…”

Section: The Eddington Ratiosmentioning

confidence: 99%

The detections of inflowing gas from narrow absorption lines at the parsec scale

Chen,

Gu,

et al. 2021

Preprint

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Inflows at the dusty torus and smaller scales is crucial to investigate the process of supermassive black hole accretion. However, only few cases of inflowing gas at small scales have been reported through redshifted broad absorption lines so far. Here we report 9 redshifted narrow absorption lines (NALs) of Mg + ions with inflowing speeds of 1071 -1979 km s −1 , which are likely along the directions close to the axes of accretion disks. The quasars showing inflowing Mg ii NALs have on average slightly smaller Eddington ratios when compared to the sources with outflow Mg ii NALs. The upper limits of locations of the detected NALs are at parsec scale, around the distances of dusty tori to central SMBHs. The one possible origin of these infalling NALs is from dusty tori. Of course, these infalling NALs can also be naturally explained by chaotic cold accretion resulted from the nonlinear interaction of active galactic nucleus (AGN) jets with the interstellar medium, and these cold gaseous blobs may originally precipitate in metal-rich trailing outflows uplifted by AGN jet ejecta. The infalling NALs may thus provide direct evidence for cold gas precipitation and accretion in AGN feedback processes, and provide the direct evidence of inflowing gas along the directions close to quasar jets and at parsec scale. It does not matter whether these infalling NALs are from the dusty tori or the interaction of AGN jets with the ISM, the infalling NALs cannot provide sufficient fuels to power the quasars.

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A Catalog of Quasar Properties from the Baryon Oscillation Spectroscopic Survey

Cited by 11 publications

References 41 publications

Improving Damped Random Walk Parameters for SDSS Stripe 82 Quasars with Pan-STARRS1

Improving Damped Random Walk Parameters for SDSS Stripe 82 Quasars with Pan-STARRS1

Detections of inflowing gas from narrow absorption lines at parsec scales

The detections of inflowing gas from narrow absorption lines at the parsec scale

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