Milky-Way-Like 2175 Å Dust Extinction Feature Observed toward the Quasar SDSS J0916<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:mo>+</mml:mo></mml:math>2921

Xue-cao, Shi; Xiang, Pan; Li-ming, Dou; Wang, Jianguo; Jiang, Peng; Yang, Chenwei; Zhou, Hongyan

doi:10.1016/j.chinastron.2020.05.004

Chinese Astronomy and Astrophysics

2020

DOI: 10.1016/j.chinastron.2020.05.004

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Milky-Way-Like 2175 Å Dust Extinction Feature Observed toward the Quasar SDSS J0916+2921

Shi Xue-cao

Pan Xiang

Dou Li-ming

et al.

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2022

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Cited by 2 publications

References 23 publications

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The 2175 Å bump features in FeLoBAL quasars: One indicator of MW-like dust in the nuclear region of quasars

Zhang

et al. 2022

A&A

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To investigate the properties of dust in the nuclear region of quasars, we explored the extinction curves of the iron low-ionisation broad absorption line (FeLoBAL) quasar SDSS J163004.29+311957.6 and its two analogues. The parametrised extinction curves indicated the Milky Way-like 2175 Å bump features in underlying extinction, which are similar to those seen in the Local Group and in a subset of high-redshift star-forming galaxies. Compared to the bump features in the Large Magellanic Cloud (LMC), the detections in this work are much closer to those in the Milky Way (MW). These bump features, as well as those in the high- and low-ionisation broad absorption line (BAL) quasars with 2175 Å bumps, are probably the counterpart of the 2175 Å bump features in the quasar environment. This type of dust grain is generally small, easily disrupted by high-energy photons, and has difficulty surviving in the radiation field of the active galactic nucleus. However, due to the presence of absorption-line outflows, the 2175 Å bump feature in quasars, which should be rare, is seen many times in BAL quasars. The shielding effect of outflow clouds allows the MW-like dust grains to be assembled or extends the survival period in the quasar nuclear region. The process and physical and chemical conditions deserve further observational study and investigation.

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The 2175 Å bump features in FeLoBAL quasars: One indicator of MW-like dust in the nuclear region of quasars

Zhang

et al. 2022

A&A

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Fundamental differences in the properties of red and blue quasars: measuring the reddening and accretion properties with X-shooter

Fawcett

Alexander

Rosario

et al. 2022

Monthly Notices of the Royal Astronomical Society

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We have recently found fundamental differences in the radio properties of red quasars when compared to typical blue quasars. In this paper we use data from the X-shooter spectrograph on the Very Large Telescope, providing spectral coverage from ∼3000–25000 Å, of a sample of 40 red and blue luminous quasars at 1.45 < z < 1.65 to explore the connections between the radio, emission-line, and accretion-disc properties. We fit various dust-extinction curves to the data and find that dust reddening can fully explain the observed colours for the majority of the red quasars in our sample, with moderate extinctions ranging from AV ∼ 0.06–0.7 mags. We confront our spectra with a simple thin accretion-disc model and find this can describe the continua of both the blue and red quasars, once corrected for dust extinction; we also find no significant differences in the accretion properties. We detect ionized outflows in a number of red and blue quasars, but do not find any significant evidence that they are more prevalent in the red quasar population. Overall our findings imply that the radio emission is more closely connected to circumnuclear/ISM opacity rather than accretion disc or outflow differences.

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Milky-Way-Like 2175 Å Dust Extinction Feature Observed toward the Quasar SDSS J0916+2921

Cited by 2 publications

References 23 publications

The 2175 Å bump features in FeLoBAL quasars: One indicator of MW-like dust in the nuclear region of quasars

The 2175 Å bump features in FeLoBAL quasars: One indicator of MW-like dust in the nuclear region of quasars

Fundamental differences in the properties of red and blue quasars: measuring the reddening and accretion properties with X-shooter

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