F. E. Bauer
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View article: BASS. LIV. Physical Properties of AGN-hosting Galaxy Mergers from Multiwavelength SED Fitting
BASS. LIV. Physical Properties of AGN-hosting Galaxy Mergers from Multiwavelength SED Fitting Open
Galaxy mergers are believed to play an important role in triggering rapid supermassive black hole (SMBH) growth. As merging nuclei approach each other, the physical properties of the participating galaxies and the associated SMBH growth ar…
View article: MUSE IFU observations of galaxies hosting of Tidal Disruption Events
MUSE IFU observations of galaxies hosting of Tidal Disruption Events Open
We present an analysis of twenty tidal disruption event (TDE) host galaxies observed with the MUSE integral-field spectrograph on ESO VLT. We investigate the presence of extended emission line regions (EELRs) and study stellar populations …
View article: Unveiling the nature of the Einstein Probe transient EP 241021a
Unveiling the nature of the Einstein Probe transient EP 241021a Open
We present a multi-wavelength analysis of the fast X-ray transient EP 241021a, discovered by the Wide-field X-ray Telescope aboard the Einstein Probe satellite on 2024 October 21. The event was not detected in gamma-rays. Follow-up observa…
View article: EP250207b is not a collapsar fast X-ray transient. Is it due to a binary compact object merger?
EP250207b is not a collapsar fast X-ray transient. Is it due to a binary compact object merger? Open
Fast X-ray Transients (FXTs) are short-lived extra-galactic X-ray sources. Recent progress through multi-wavelength follow-up of Einstein Probe discovered FXTs has shown that several are related to collapsars, which can also produce γ-ray …
View article: Changing-Look Active Galactic Nuclei in SDSS-V: Host-Galaxy Properties and Black-Hole Scaling Relations
Changing-Look Active Galactic Nuclei in SDSS-V: Host-Galaxy Properties and Black-Hole Scaling Relations Open
Changing-look active galactic nuclei (CL-AGNs) exhibit dramatic spectral variability on unexpectedly short timescales, challenging standard accretion flow models. Despite growing samples, the physical drivers of this extreme variability, a…
View article: The Advanced X-ray Imaging Satellite Community Science Book
The Advanced X-ray Imaging Satellite Community Science Book Open
The AXIS Community Science Book represents the collective effort of more than 500 scientists worldwide to define the transformative science enabled by the Advanced X-ray Imaging Satellite (AXIS), a next-generation X-ray mission selected by…
View article: The SDSS-V Black Hole Mapper Reverberation Mapping Project: Light Echoes of the Coronal Line Region in a Luminous Quasar
The SDSS-V Black Hole Mapper Reverberation Mapping Project: Light Echoes of the Coronal Line Region in a Luminous Quasar Open
We present a reverberation mapping analysis of the coronal line [Ne V]$λ$3427 emitting region of the quasar COS168 (SDSS J095910.30+020732.2). [Ne V]$λ$3427 is known as one of the "coronal lines," which are a species of emission lines pres…
View article: Insights for Early Massive Black Hole Growth from JWST Detection of the [Ne v] <i>γ</i>3427 Emission Line
Insights for Early Massive Black Hole Growth from JWST Detection of the [Ne v] <i>γ</i>3427 Emission Line Open
We use the narrow [Ne v] λ 3427 emission line detected in the recently published JWST spectra of two galaxies, at z ≃ 6.9 and 5.6, to study the key properties of the active galactic nuclei (AGN) and the supermassive black holes (SMBHs) in …
View article: Examining Active Galactic Nucleus UV/Optical Variability beyond the Simple Damped Random Walk. II. Insights from 22 yr Observations of SDSS, PS1, and ZTF
Examining Active Galactic Nucleus UV/Optical Variability beyond the Simple Damped Random Walk. II. Insights from 22 yr Observations of SDSS, PS1, and ZTF Open
A damped random walk (DRW) process is often used to describe the temporal UV/optical continuum variability of active galactic nuclei (AGN). However, recent investigations have shown that this model fails to capture the full spectrum of AGN…
View article: Unlocking AGN Variability with Custom ZTF Photometry for High-Fidelity Light Curves and Robust Selection
Unlocking AGN Variability with Custom ZTF Photometry for High-Fidelity Light Curves and Robust Selection Open
(Abridged)We explore the potential of optical variability selection methods to identify AGN, including those challenging to detect with conventional techniques. Using the unprecedented combination of depth, sky coverage, and cadence of the…
View article: SDSS-V black hole mapper: the index diagram as a tool to disentangle the influence of the host galaxy in quasar spectra
SDSS-V black hole mapper: the index diagram as a tool to disentangle the influence of the host galaxy in quasar spectra Open
We revisit the Quasar Main Sequence (QMS) by investigating the impact of the stellar component from the host galaxy (HG) on the emission line spectra of the active galactic nuclei (AGNs). We first detect spectra with broad emission lines u…
View article: The faintest, extremely variable X-ray tidal disruption event from a supermassive black hole binary?
The faintest, extremely variable X-ray tidal disruption event from a supermassive black hole binary? Open
Tidal disruption events (TDEs), which occur when stars enter the tidal radii of supermassive black holes (SMBHs) and are subsequently torn apart by their tidal forces, represent intriguing phenomena that stimulate growing research interest…
View article: The SDSS-V Black Hole Mapper Reverberation Mapping Project: Multiline Dynamical Modeling of a Highly Variable Active Galactic Nucleus with Decade-long Light Curves
The SDSS-V Black Hole Mapper Reverberation Mapping Project: Multiline Dynamical Modeling of a Highly Variable Active Galactic Nucleus with Decade-long Light Curves Open
We present dynamical modeling of the broad-line region (BLR) of the highly variable active galactic nucleus (AGN) SDSS J141041.25+531849.0 ( z = 0.359) using photometric and spectroscopic monitoring data from the Sloan Digital Sky Survey (…
View article: BASS LIV. Physical Properties of AGN-Hosting Galaxy Mergers from Multiwavelength SED Fitting
BASS LIV. Physical Properties of AGN-Hosting Galaxy Mergers from Multiwavelength SED Fitting Open
Galaxy mergers are believed to play an important role in triggering rapid supermassive black hole (SMBH) growth. As merging nuclei approach each other, the physical properties of the participating galaxies and the associated SMBH growth ar…
View article: BASS. LII. The Prevalence of Double-peaked Broad Lines at Low Accretion Rates among Hard X-Ray Selected Active Galactic Nuclei
BASS. LII. The Prevalence of Double-peaked Broad Lines at Low Accretion Rates among Hard X-Ray Selected Active Galactic Nuclei Open
A fraction of active galactic nuclei (AGN) have double-peaked H α , H β, and Mg II broad lines attributed to emission from rotating gas in the accretion disk. Using optical spectroscopy of a flux-limited sample of AGN selected via ultrahar…
View article: Galaxy Spectra Networks (GaSNet) – III. Reconstructive pre-trained network for spectrum reconstruction, redshift estimate, and anomaly detection
Galaxy Spectra Networks (GaSNet) – III. Reconstructive pre-trained network for spectrum reconstruction, redshift estimate, and anomaly detection Open
Classification of spectra (1) and anomaly detection (2) are fundamental steps to guarantee the highest accuracy in redshift measurements (3) in modern all-sky spectroscopic surveys. We introduce a new Galaxy Spectra Neural Network (GaSNet-…
View article: Broad line region echo from highly accreting intermediate-mass black hole candidate SDSS J144850.08+160803.1
Broad line region echo from highly accreting intermediate-mass black hole candidate SDSS J144850.08+160803.1 Open
Context. Elusive intermediate-mass black holes (IMBHs; 100 M ⊙ ≤ M BH ≤ 2 × 10 5 M ⊙ ) can be used as “time-squeezing” machines, enabling studies of active galactic nucleus (AGN) geometry via reverberation mapping (RM) on much shorter time…
View article: A massive gas outflow outside the line of sight: Imaging polarimetry of the blue excess Hot Dust-Obscured Galaxy W0204–0506
A massive gas outflow outside the line of sight: Imaging polarimetry of the blue excess Hot Dust-Obscured Galaxy W0204–0506 Open
Aims. Hot Dust-Obscured Galaxies (Hot DOGs) are a population of hyper-luminous, heavily obscured quasars. Although nearly Compton-thick nuclear obscurations are typical for Hot DOGs, a fraction show blue UV spectral energy distributions co…
View article: High-resolution Optical IFU Spectroscopy of the Complex Galaxy Merger II Zw 096
High-resolution Optical IFU Spectroscopy of the Complex Galaxy Merger II Zw 096 Open
Luminous and ultraluminous IR galaxies are critical for investigating feedback mechanisms due to a combination of intense star formation episodes and active galactic nuclei (AGN), particularly in the context of complex galaxy interactions.…
View article: The La Silla Schmidt Southern Survey
The La Silla Schmidt Southern Survey Open
We present the La Silla Schmidt Southern Survey (LS4), a new wide-field, time-domain survey to be conducted with the 1 m ESO Schmidt telescope. The 268 megapixel LS4 camera mosaics 32 2k × 4k fully depleted CCDs, providing a ∼20 deg 2 fiel…
View article: BASS. LIII. The Eddington Ratio as the Primary Regulator of the Fraction of X-Ray Emission in Active Galactic Nuclei
BASS. LIII. The Eddington Ratio as the Primary Regulator of the Fraction of X-Ray Emission in Active Galactic Nuclei Open
Active galactic nuclei (AGN) emit radiation via accretion across the entire energy spectrum. While the standard disk and corona model can somewhat describe this emission, it fails to predict specific features such as the soft X-ray excess,…
View article: The Day-long, Repeating GRB 250702B: A Unique Extragalactic Transient
The Day-long, Repeating GRB 250702B: A Unique Extragalactic Transient Open
γ -ray bursts (GRBs) are singular outbursts of high-energy radiation with durations typically lasting from milliseconds to minutes and, in extreme cases, a few hours. They are attributed to the catastrophic outcomes of stellar-scale events…
View article: NGC 3259: A signal for an untapped population of slowly accreting intermediate-mass black holes
NGC 3259: A signal for an untapped population of slowly accreting intermediate-mass black holes Open
Low-mass active galactic nuclei (AGNs) can provide important constraints on the formation and evolution of supermassive black holes (SMBHs), which stands as a central challenge in modern cosmology. To date, only small samples of intermedia…
View article: The luminosity history of fading local quasars over 10 <sup>4 − 5</sup> years as observed by VLT-MUSE
The luminosity history of fading local quasars over 10 <sup>4 − 5</sup> years as observed by VLT-MUSE Open
We present a comprehensive study of five nearby active galaxies featuring large (tens of kiloparsecs) extended emission-line regions (EELRs). The study is based on large-format, integral-field spectroscopic observations conducted with the …
View article: ALMA Lensing Cluster Survey: Physical Characterization of Near-infrared-dark Intrinsically Faint ALMA Sources at <i>z</i> = 2–4
ALMA Lensing Cluster Survey: Physical Characterization of Near-infrared-dark Intrinsically Faint ALMA Sources at <i>z</i> = 2–4 Open
We present results from Atacama Large Millimeter/submillimeter Array (ALMA) spectral line-scan observations at 3 mm and 2 mm bands of three near-infrared-dark (NIR-dark) galaxies behind two massive lensing clusters MACS J0417.5-1154 and RX…
View article: BASS. XLVIII. [Ne <scp>V</scp>] <i>λ</i>3427 Emission in Powerful Nearby Active Galactic Nuclei
BASS. XLVIII. [Ne <span>V</span>] <i>λ</i>3427 Emission in Powerful Nearby Active Galactic Nuclei Open
We investigate the high-ionization, narrow [Ne V ] λ 3427 line emission in a sample of over 340 ultrahard X-ray (14–195 keV) selected active galactic nuclei (AGN) drawn from the BAT AGN Spectroscopic Survey project. The analysis includes m…
View article: JWST reveals a supernova following a gamma-ray burst at z $\simeq$ 7.3
JWST reveals a supernova following a gamma-ray burst at z $\simeq$ 7.3 Open
The majority of energetic long-duration gamma-ray bursts (GRBs) are thought to arise from the collapse of massive stars, making them powerful tracers of star formation across cosmic time. Evidence for this origin comes from the presence of…
View article: The day-long, repeating GRB 250702BDE / EP250702a: A unique extragalactic transient
The day-long, repeating GRB 250702BDE / EP250702a: A unique extragalactic transient Open
Gamma-ray bursts (GRBs) are singular outbursts of high-energy radiation with durations typically lasting from milliseconds to minutes and, in extreme cases, a few hours. They are attributed to the catastrophic outcomes of stellar-scale eve…
View article: EP240801a/XRF 240801B: An X-Ray Flash Detected by the Einstein Probe and the Implications of Its Multiband Afterglow
EP240801a/XRF 240801B: An X-Ray Flash Detected by the Einstein Probe and the Implications of Its Multiband Afterglow Open
We present multiband observations and analysis of EP240801a, a low-energy, extremely soft gamma-ray burst (GRB) discovered on 2024 August 1 by the Einstein Probe (EP) satellite with a weak contemporaneous signal also detected by the Fermi …
View article: EP 250108a/SN 2025kg: Observations of the Most Nearby Broad-line Type Ic Supernova Following an Einstein Probe Fast X-Ray Transient
EP 250108a/SN 2025kg: Observations of the Most Nearby Broad-line Type Ic Supernova Following an Einstein Probe Fast X-Ray Transient Open
With a small sample of fast X-ray transients (FXTs) with multiwavelength counterparts discovered to date, their progenitors and connections to γ -ray bursts (GRBs) and supernovae (SNe) remain ambiguous. Here, we present photometric and spe…