Jin‐Ming Bai
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View article: Unprecedented Continuum Time Delay Variation Phenomenon in an Active Supermassive Black Hole
Unprecedented Continuum Time Delay Variation Phenomenon in an Active Supermassive Black Hole Open
Resolving the accretion disks and broad-line regions of active galactic nuclei (AGNs) can probe the physics behind supermassive black hole (SMBH) fueling and weigh SMBHs. With time-domain observations, the reverberation mapping (RM) techni…
View article: Monitoring AGNs with H<i>β</i> Asymmetry. V. Long-term Variation and Evolution of the Broad H<i>β</i> Emission-line Profiles
Monitoring AGNs with H<i>β</i> Asymmetry. V. Long-term Variation and Evolution of the Broad H<i>β</i> Emission-line Profiles Open
The physical origins of the diverse emission-line asymmetries observed in the spectra of active galactic nuclei (AGNs) are not completely understood. Monitoring the temporal variations of line profiles offers a promising approach to invest…
View article: Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. XIV. Long-duration High-cadence Reverberation Mapping Results for 11 PG Quasars
Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. XIV. Long-duration High-cadence Reverberation Mapping Results for 11 PG Quasars Open
We report the results of a long-duration high-cadence reverberation mapping campaign of a second batch of 11 PG quasars using the 2.2 m telescope at the Calar Alto Observatory. This follows a similar earlier study of another sample of 15 o…
View article: Properties of Interstellar Medium in the S0 Galaxy NGC 1222: Evidence for Shock-enhanced Line Emission
Properties of Interstellar Medium in the S0 Galaxy NGC 1222: Evidence for Shock-enhanced Line Emission Open
In this paper, we present a comprehensive study on the properties of the interstellar medium in NGC 1222, a star-forming early-type merging galaxy that forms a triple system, using optical and far-infrared spectroscopic, and multiband phot…
View article: Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. XII. Reverberation Mapping Results for 15 PG Quasars from a Long-Duration High-Cadence Campaign
Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. XII. Reverberation Mapping Results for 15 PG Quasars from a Long-Duration High-Cadence Campaign Open
We present the first results from long-term high-cadence spectroscopic monitoring of 15 PG quasars with relatively strong Fe II emission as a part of a broader reverberation mapping campaign performed with the Calar Alto Observatory 2.2m t…
View article: Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. XIV. Long-Duration High-Cadence Reverberation Mapping Results for 11 PG Quasars
Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. XIV. Long-Duration High-Cadence Reverberation Mapping Results for 11 PG Quasars Open
We report the results of a long-duration high-cadence reverberation mapping campaign of a second batch of 11 PG quasars using the 2.2m telescope at the Calar Alto Observatory. This follows a similar earlier study of another sample of 15 ob…
View article: Monitoring AGNs with H$β$ Asymmetry. V. Long-term Variation and Evolution of the Broad H$β$ Emission-Line Profiles
Monitoring AGNs with H$β$ Asymmetry. V. Long-term Variation and Evolution of the Broad H$β$ Emission-Line Profiles Open
The physical origins of the diverse emission-line asymmetries observed in the spectra of active galactic nuclei (AGNs) remain incompletely understood. Monitoring the temporal variations of line profiles offers a promising approach to inves…
View article: An outburst in the quasar PG1244+026 from an energy source unrelated to accretion onto itssupermassive black hole
An outburst in the quasar PG1244+026 from an energy source unrelated to accretion onto itssupermassive black hole Open
The standard paradigm of active galactic nuclei (AGNs) is accretion onto a central supermassive black hole (SMBH) powering their enormous luminosity, and predicts significant reverberation of their broad-line regions (BLRs) and dusty tori …
View article: Broad-line Region of the Quasar PG 2130+099. II. Doubling the Size Over Four Years?
Broad-line Region of the Quasar PG 2130+099. II. Doubling the Size Over Four Years? Open
Over the past three decades, multiple reverberation mapping (RM) campaigns conducted for the quasar PG 2130+099 have exhibited inconsistent findings with time delays ranging from ∼10 to ∼200 days. To achieve a comprehensive understanding o…
View article: Spectroastrometry and Reverberation Mapping of Active Galactic Nuclei. I. The Hβ Broad-line Region Structure and Black Hole Masses of Five Quasars
Spectroastrometry and Reverberation Mapping of Active Galactic Nuclei. I. The Hβ Broad-line Region Structure and Black Hole Masses of Five Quasars Open
We conduct a reverberation mapping (RM) campaign to spectroscopically monitor a sample of selected bright active galactic nuclei with large anticipated broad-line region (BLR) sizes adequate for spectroastrometric (SA) observations by the …
View article: Broad-line Region of the Quasar PG 2130+099. II. Doubling the Size Over Four Years?
Broad-line Region of the Quasar PG 2130+099. II. Doubling the Size Over Four Years? Open
Over the past three decades, multiple reverberation mapping (RM) campaigns conducted for the quasar PG 2130+099 have exhibited inconsistent findings with time delays ranging from $\sim$10 to $\sim$200 days. To achieve a comprehensive under…
View article: Unprecedented Continuum Time Delay Variation Phenomenon in an Active Supermassive Black Hole
Unprecedented Continuum Time Delay Variation Phenomenon in an Active Supermassive Black Hole Open
Resolving the accretion disks and broad line regions (BLRs) of active galactic nuclei (AGNs) can probe the physics behind supermassive black holes (SMBHs) fueling and weigh SMBHs. With time-domain observations, the reverberation mapping (R…
View article: Spectroastrometry and Reverberation Mapping (SARM) of Active Galactic Nuclei. I. The H$β$ Broad-line Region Structure and Black Hole Mass of Five Quasars
Spectroastrometry and Reverberation Mapping (SARM) of Active Galactic Nuclei. I. The H$β$ Broad-line Region Structure and Black Hole Mass of Five Quasars Open
We conduct a reverberation mapping (RM) campaign to spectroscopically monitor a sample of selected bright active galactic nuclei with large anticipated broad-line region (BLR) sizes adequate for spectroastrometric observations by the GRAVI…
View article: Monitoring AGNs with H$β$ Asymmetry. IV. First Reverberation Mapping Results of 14 AGNs
Monitoring AGNs with H$β$ Asymmetry. IV. First Reverberation Mapping Results of 14 AGNs Open
We report first-time reverberation mapping results for 14 AGNs from the ongoing Monitoring AGNs with H$β$ Asymmetry campaign (MAHA). These results utilize optical spectra obtained with the Long Slit Spectrograph on the Wyoming Infrared 2.3…
View article: Quasar Winds Caught on Acceleration and Deceleration
Quasar Winds Caught on Acceleration and Deceleration Open
We present an observational study of wind acceleration based on four low-ionization broad absorption line (BAL) quasars (J0136, J1238, J1259, and J1344). J0136 and J1344 (group 1) are radio-quiet and show large BAL-velocity shifts as oppos…
View article: Prospects of the Multi-channel Photometric Survey Telescope in the Cosmological Application of Type Ia Supernovae
Prospects of the Multi-channel Photometric Survey Telescope in the Cosmological Application of Type Ia Supernovae Open
The Multi-channel Photometric Survey Telescope (Mephisto) is a real-time, three-color photometric system designed to capture the color evolution of stars and transients accurately. This telescope system can be crucial in cosmological dista…
View article: Quasar winds caught on acceleration and deceleration
Quasar winds caught on acceleration and deceleration Open
We present an observational study of wind acceleration based on four low-ionization broad absorption line (LoBAL) quasars (J0136, J1238, J1259, J1344). J0136 and J1344 (group-1) are radio quiet and show large BAL-velocity shifts as opposed…
View article: Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. XIII. Ultraviolet Time Lag of Hβ Emission in Mrk 142
Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. XIII. Ultraviolet Time Lag of Hβ Emission in Mrk 142 Open
We performed a rigorous reverberation-mapping analysis of the broad-line region (BLR) in a highly accreting ( L / L Edd = 0.74–3.4) active galactic nucleus, Markarian 142 (Mrk 142), for the first time using concurrent observations of the i…
View article: Correcting the Contamination of Second-order Spectra: Improving Hα Measurements in Reverberation Mapping Campaigns
Correcting the Contamination of Second-order Spectra: Improving Hα Measurements in Reverberation Mapping Campaigns Open
Long-term spectroscopic monitoring campaigns on active galactic nuclei (AGNs) provide a wealth of information about its interior structure and kinematics. However, a number of the observations suffer from the contamination of second-order …
View article: Unveiling Asymmetric Geometry of Broad-Line Region in Active Galactic Nuclei
Unveiling Asymmetric Geometry of Broad-Line Region in Active Galactic Nuclei Open
Broad emission lines of active galactic nuclei originate from the broad-line region, consisting of dense gas clouds in orbit around an accreting supermassive black hole. Understanding the geometry and kinematics of the region is crucial fo…
View article: Circumstellar Material Ejected Violently by A Massive Star Immediately before its Death
Circumstellar Material Ejected Violently by A Massive Star Immediately before its Death Open
Type II supernovae represent the most common stellar explosions in the Universe, for which the final stage evolution of their hydrogen-rich massive progenitors towards core-collapse explosion are elusive. The recent explosion of SN 2023ixf…
View article: Revisiting Emission-Line Measurement Methods for Narrow-Line Active Galactic Nuclei
Revisiting Emission-Line Measurement Methods for Narrow-Line Active Galactic Nuclei Open
Measuring broad emission-line widths in active galactic nuclei (AGN) is not straightforward owing to the complex nature of flux variability in these systems. Line-width measurements become especially challenging when signal-to-noise is low…
View article: Supermassive Black Hole and Broad-line Region in NGC 5548: Results from Five-season Reverberation Mapping
Supermassive Black Hole and Broad-line Region in NGC 5548: Results from Five-season Reverberation Mapping Open
NGC 5548 is one of the active galactic nuclei (AGNs) selected for our long-term spectroscopic monitoring with the Lijiang 2.4 m telescope, aiming at investigating the origin and evolution of broad-line regions (BLRs), accurately measuring …
View article: Cover Picture: Astron. Nachr. 9‐10/2022
Cover Picture: Astron. Nachr. 9‐10/2022 Open
The Centurion 18 inch Transiting Exoplanet Survey Telescope (TEST) with a focal ratio F2.8 located on Gaomeigu campus at the Lijiang station of Yunnan Observatories, China, since 2016 is shown with its dome completely opened at dusk.TEST i…
View article: Supermassive Black Hole and Broad-line Region in NGC~5548: Results from Five-season Reverberation Mapping
Supermassive Black Hole and Broad-line Region in NGC~5548: Results from Five-season Reverberation Mapping Open
NGC 5548 is one of the active galactic nuclei (AGN) selected for our long-term spectroscopic monitoring with the Lijiang 2.4~m telescope, aiming at investigating the origin and evolution of the broad-line regions (BLRs), accurately measuri…
View article: Monitoring AGNs with Hβ Asymmetry. III. Long-term Reverberation Mapping Results of 15 Palomar–Green Quasars
Monitoring AGNs with Hβ Asymmetry. III. Long-term Reverberation Mapping Results of 15 Palomar–Green Quasars Open
In this third paper of the series reporting on the reverberation mapping campaign of active galactic nuclei with asymmetric H β emission-line profiles, we present results for 15 Palomar–Green quasars using spectra obtained between the end …
View article: Monitoring AGNs with H$β$ Asymmetry. III. Long-term Reverberation Mapping Results of 15 Palomar-Green Quasars
Monitoring AGNs with H$β$ Asymmetry. III. Long-term Reverberation Mapping Results of 15 Palomar-Green Quasars Open
In this third paper of the series reporting on the reverberation mapping (RM) campaign of active galactic nuclei with asymmetric H$β$ emission-line profiles, we present results for 15 Palomar-Green (PG) quasars using spectra obtained betwe…
View article: AGN STORM 2. I. First results: A Change in the Weather of Mrk 817
AGN STORM 2. I. First results: A Change in the Weather of Mrk 817 Open
\n We present the first results from the ongoing, intensive, multiwavelength monitoring program of the luminous Seyfert 1 galaxy Mrk 817. While this active galactic nucleus was, in part, selected for its historically unobscured nature, we …
View article: SN 2015bq: A Luminous Type Ia Supernova with Early Flux Excess
SN 2015bq: A Luminous Type Ia Supernova with Early Flux Excess Open
We present optical and ultraviolet (UV) observations of a luminous type Ia supernova (SN Ia) SN 2015bq characterized by early flux excess. This SN reaches a B -band absolute magnitude at M B = −19.68 ± 0.41 mag and a peak bolometric lumino…
View article: A Systematic Search for Dual AGNs in Merging Galaxies (Astro-daring): III: Results from the SDSS Spectroscopic Surveys
A Systematic Search for Dual AGNs in Merging Galaxies (Astro-daring): III: Results from the SDSS Spectroscopic Surveys Open
As the third installment in a series systematically searching dual active galactic nuclei (AGN) among merging galaxies, we present the results of 20 dual AGNs found by using the SDSS fiber spectra. To reduce the flux contamination from bot…