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View article: Active Galactic Nuclei in the Extremely Overdense Galaxy Region BOSS 1441: A Chandra Observation
Active Galactic Nuclei in the Extremely Overdense Galaxy Region BOSS 1441: A Chandra Observation Open
We present a Chandra/ACIS-I study of X-ray sources in BOSS 1441, a protocluster at z = 2.32 ± 0.02 that exhibits a prominent overdensity of Ly α emitters (LAEs). Using a 45 ks observation, we identify seven X-ray sources spatially coincide…
View article: A Torus Remnant Revealed by the Infrared Echo of Tidal Disruption Event AT 2019qiz: Implications for the Missing Energy and Quasiperiodic Eruption Formation
A Torus Remnant Revealed by the Infrared Echo of Tidal Disruption Event AT 2019qiz: Implications for the Missing Energy and Quasiperiodic Eruption Formation Open
AT 2019qiz is the first standard optical tidal disruption event (TDE) with detection of X-ray quasiperiodic eruptions (QPEs), providing strong evidence for TDE–QPE association. Moreover, it belongs to the rare subset of optical TDEs with p…
View article: Comprehensive assessment and analysis of urban resilience based on fusion modeling–taking guilin as an example
Comprehensive assessment and analysis of urban resilience based on fusion modeling–taking guilin as an example Open
Dramatic global climate change has led to an increase in multiple and uncertain risks to urban safety and sustainable development, and cities urgently need to enhance their comprehensive response capacity. Urban resilience emphasizes the s…
View article: The Secular Periodic Evolution of X-Ray Quasiperiodic Eruptions Driven by Star−Disk Collisions
The Secular Periodic Evolution of X-Ray Quasiperiodic Eruptions Driven by Star−Disk Collisions Open
We study the secular periodic evolution of quasiperiodic eruptions (QPEs) for GSN069 and eRO-QPE2 assuming that they are driven by star−disk collisions. We set up numerical simulations and compared them with the observed periodic decay of …
View article: Highly Variable Quasar Candidates Selected from 4XMM-DR13 with Machine Learning
Highly Variable Quasar Candidates Selected from 4XMM-DR13 with Machine Learning Open
We present a sample of 12 quasar candidates with highly variable soft X-ray emission, selected from the fourth XMM-Newton Serendipitous Source Catalog (4XMM-DR13), using random forest (RF). Optical to mid-IR photometric data for the 4XMM-D…
View article: The Secular Periodic Evolution of X-ray Quasi-periodic Eruptions Driven by Star-disc Collisions
The Secular Periodic Evolution of X-ray Quasi-periodic Eruptions Driven by Star-disc Collisions Open
We study the secular periodic evolution of quasi-periodic eruptions (QPEs) for GSN069 and eRO-QPE2 assuming that they are driven by star-disc collisions. We set up numerical simulations and compared them with the observed periodic decay of…
View article: Estimation of ecosystem service value in Huixian Karst National Wetland Park based on equivalent factor method
Estimation of ecosystem service value in Huixian Karst National Wetland Park based on equivalent factor method Open
Huixian Wetland Park's sustainable development will be aided by an analysis of the park's shifting ecosystem service value trend and an assessment of its ecological sustainable development potential.
View article: Spatiotemporal Analysis of Photovoltaic Potential in Ordos City Based on an Improved CRITIC Method
Spatiotemporal Analysis of Photovoltaic Potential in Ordos City Based on an Improved CRITIC Method Open
In view of the contradiction between the still-high energy consumption in Ordos and the increasingly urgent carbon-neutral goal, the adjustment of energy structures has begun, and strategic planning of photovoltaic facility construction cr…
View article: Highly Variable Quasar Candidates Selected from 4XMM-DR13 with Machine Learning
Highly Variable Quasar Candidates Selected from 4XMM-DR13 with Machine Learning Open
We present a sample of 12 quasar candidates with highly variable soft X-ray emission from the 4th XMM-newton Serendipitous Source Catalog (4XMM-DR13) using random forest. We obtained optical to mid-IR photometric data for the 4XMM-DR13 sou…
View article: Discovery of a years-delayed radio flare from an unusually slow-evolved tidal disruption event
Discovery of a years-delayed radio flare from an unusually slow-evolved tidal disruption event Open
SDSS J1115+0544 is a unique low-ionization nuclear emission-line region (LINER) galaxy with energetic ultraviolet (UV), optical and mid-infrared outbursts occurring in its nucleus. We present the results from an analysis of multi-wavelengt…
View article: Recurring tidal disruption events a decade apart in IRAS F01004-2237
Recurring tidal disruption events a decade apart in IRAS F01004-2237 Open
Context. In theory, recurring tidal disruption events (TDEs) may occur when a close stellar binary encounters a supermassive black hole, if one star is captured and undergoes repeating partial TDEs, or if both stars are tidally disrupted (…
View article: Recurring tidal disruption events a decade apart in IRAS F01004-2237
Recurring tidal disruption events a decade apart in IRAS F01004-2237 Open
We report the discovery of a second optical flare that occurred in September 2021 in IRAS F01004-2237, where the first flare occurred in 2010 has been reported, and present a detailed analysis of multi-band data. The position of the flare …
View article: A Centiparsec-scale Compact Radio Core in the Nearby Galaxy M60
A Centiparsec-scale Compact Radio Core in the Nearby Galaxy M60 Open
M60, an elliptical galaxy located 16.5 Mpc away, has an active nucleus with a very low luminosity and an extremely low accretion rate. Its central supermassive black hole (SMBH) has a mass of M BH ∼ 4.5 × 10 9 M ⊙ and a Schwarzschild radiu…
View article: A centi-pc-scale compact radio core in the nearby galaxy M60
A centi-pc-scale compact radio core in the nearby galaxy M60 Open
M60, an elliptical galaxy located 16.5~Mpc away, has an active nucleus with a very low luminosity and an extremely low accretion rate. Its central supermassive black hole has a mass of $M_{\rm BH}\sim4.5\times10^{9}\, M_{\odot}$ and a Schw…
View article: Inspiraling streams of enriched gas observed around a massive galaxy 11 billion years ago
Inspiraling streams of enriched gas observed around a massive galaxy 11 billion years ago Open
Stars form in galaxies, from gas that has been accreted from the intergalactic medium. Simulations have shown that recycling of gas—the reaccretion of gas that was previously ejected from a galaxy—could sustain star formation in the early …
View article: SN 2017egm: A Helium-rich Superluminous Supernova with Multiple Bumps in the Light Curves
SN 2017egm: A Helium-rich Superluminous Supernova with Multiple Bumps in the Light Curves Open
When discovered, SN 2017egm was the closest (redshift z = 0.03) hydrogen-poor superluminous supernova (SLSN-I) and a rare case that exploded in a massive and metal-rich galaxy. Thus, it has since been extensively observed and studied. We r…
View article: SN2017egm: A Helium-rich Superluminous Supernova with Multiple Bumps in the Light Curves
SN2017egm: A Helium-rich Superluminous Supernova with Multiple Bumps in the Light Curves Open
When discovered, SN~2017egm was the closest (redshift $z=0.03$) hydrogen-poor superluminous supernova (SLSN-I) and a rare case that exploded in a massive and metal-rich galaxy. Thus, it has since been extensively observed and studied. We r…
View article: A possible 250-second X-ray quasi-periodicity in the fast blue optical transient AT2018cow
A possible 250-second X-ray quasi-periodicity in the fast blue optical transient AT2018cow Open
The fast blue optical transients (FBOTs) are a new population of extragalactic transients of unclear physical origin. A variety of mechanisms have been proposed including failed supernova explosion, shock interaction with a dense medium, y…
View article: Transient Radio Emission from Low-redshift Galaxies at z < 0.3 Revealed by the VLASS and FIRST Surveys
Transient Radio Emission from Low-redshift Galaxies at z < 0.3 Revealed by the VLASS and FIRST Surveys Open
We present the discovery of a sample of 18 low-redshift ( z < 0.3) galaxies with transient nuclear radio emission. These galaxies are not detected or are weakly detected in the Faint Images of the Radio Sky at Twenty cm survey, performed f…
View article: X-ray view of a merging supermassive black hole binary candidate SDSS J1430+2303: Results from the first ∼200 days of observations
X-ray view of a merging supermassive black hole binary candidate SDSS J1430+2303: Results from the first ∼200 days of observations Open
Context. Recently we discovered an unprecedented supermassive black hole binary (SMBHB) candidate in the nearby Seyfert galaxy SDSS J1430+2303, which is predicted to merge within three years. X-ray spectroscopy may bring unique kinematic e…
View article: X-ray view of a merging supermassive black hole binary candidate SDSSJ1430+2303: Results from the first ~200 days of observations
X-ray view of a merging supermassive black hole binary candidate SDSSJ1430+2303: Results from the first ~200 days of observations Open
Recently we discovered an unprecedented supermassive black hole binary (SMBHB) candidate in the nearby Seyfert galaxy SDSS J1430+2303, which is predicted to merge within three years. X-ray spectroscopy may bring unique kinematic evidence f…
View article: Transient radio emission from low-redshift galaxies at z<0.3 revealed by VLASS and FIRST surveys
Transient radio emission from low-redshift galaxies at z<0.3 revealed by VLASS and FIRST surveys Open
We present the discovery of a sample of 18 low-redshift (z<0.3) galaxies with transient nuclear radio emission. These galaxies are not or weakly detected in the Faint Images of the Radio Sky at Twenty cm survey performed on 1993-2009, but …
View article: VLBI imaging of the pre-coalescence SMBHB candidate SDSS J143016.05+230344.4
VLBI imaging of the pre-coalescence SMBHB candidate SDSS J143016.05+230344.4 Open
Context. Recently, SDSS J143016.05+230344.4 (J1430+2303) was reported to be a supermassive black hole binary (SMBHB) in the final coalescence phase. It is probably the first SMBHB coalescence event observable in human history. Radio observ…
View article: Discovery of ATLAS17jrp as an Optical-, X-Ray-, and Infrared-bright Tidal Disruption Event in a Star-forming Galaxy
Discovery of ATLAS17jrp as an Optical-, X-Ray-, and Infrared-bright Tidal Disruption Event in a Star-forming Galaxy Open
We hereby report the discovery of ATLAS17jrp as an extraordinary tidal disruption event (TDE) in the star-forming galaxy SDSS J162034.99+240726.5 in our recent sample of mid-infrared outbursts in nearby galaxies. Its optical/UV light curve…
View article: Discovery of ATLAS17jrp as an Optical, X-ray and Infrared Bright TDE in a Star-forming Galaxy
Discovery of ATLAS17jrp as an Optical, X-ray and Infrared Bright TDE in a Star-forming Galaxy Open
We hereby report the discovery of ATLAS17jrp as an extraordinary TDE in star-forming galaxy SDSSJ162034.99+240726.5 in our recent sample of mid-infrared outbursts in nearby galaxies. Its optical/UV light curves rise to a peak luminosity $\…
View article: An Obscured Tidal Disruption Event Manifested as Energetic Mid-infrared Outburst in a Milky-Way-sized Star-forming Galaxy
An Obscured Tidal Disruption Event Manifested as Energetic Mid-infrared Outburst in a Milky-Way-sized Star-forming Galaxy Open
Stellar tidal disruption events (TDEs) by supermassive black holes are now discovered at a rate of about a dozen annually from optical time-domain surveys. However, they are puzzlingly overrepresented in post-starburst galaxies but almost …
View article: AT 2019avd: A Tidal Disruption Event with a Two-phase Evolution
AT 2019avd: A Tidal Disruption Event with a Two-phase Evolution Open
Tidal disruption events (TDEs) can uncover the quiescent supermassive black holes (SMBHs) at the center of galaxies and also offer a promising method to study them. After the disruption of a star by an SMBH, the highly elliptical orbit of …
View article: Discovery of late-time X-ray flare and anomalous emission line enhancement after the nuclear optical outburst in a narrow-line Seyfert 1 Galaxy
Discovery of late-time X-ray flare and anomalous emission line enhancement after the nuclear optical outburst in a narrow-line Seyfert 1 Galaxy Open
CSS J102913+404220 is an atypical narrow-line Seyfert 1 galaxy with an energetic optical outburst occurring co-spatially with its nucleus. We present a detailed analysis of multi-wavelength photometric and spectroscopic observations of thi…