269 citations · 1.7k across the 46 of their papers we have counts for
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Active Dwarf Galaxy Database II: Connections between Host Galaxy Properties and Black Hole Accretion Signatures
Erik J. Wasleske, Vivienne F. Baldassare, Christopher M. Carroll
We investigate the connection between accretion signatures and host galaxy properties in the context of how active dwarf galaxies are identified. We use the database constructed in…
Central Massive Black Holes Are Not Ubiquitous in Local Low-Mass Galaxies
Fan Zou, Elena Gallo, Anil C. Seth +13
The black-hole occupation fraction () defines the fraction of galaxies that harbor central massive black holes (MBHs), irrespective of their accretion activity leve…
A JWST View of the Overmassive Black Hole in NGC 4486B
Behzad Tahmasebzadeh, Matthew A. Taylor, Monica Valluri +19
We present a new stellar dynamical measurement of the supermassive black hole (SMBH) in the compact elliptical galaxy NGC 4486B, based on integral field spectroscopy with JWST/NIRS…
A Large-Scale Search for Photometrically Variable AGNs in Dwarf Galaxies Using the Young Supernova Experiment
Alexander Messick, Vivienne Baldassare, David O. Jones +12
We conduct an analysis of over 60,000 dwarf galaxies (7<=log(M_*/M_\odot)<=10) in search of photometric variability indicative of active galactic nuclei (AGNs). Using data from the…
A Supermassive Black Hole in a Diminutive Ultra-compact Dwarf Galaxy Discovered with JWST/NIRSpec+IFU
Matthew A. Taylor, Behzad Tahmasebzadeh, Solveig Thompson +18
The integral-field unit mode of the Near-Infrared Spectrograph (NIRSpec+IFU) mounted on the James Webb Space Telescope has now enabled kinematic studies of smaller and less massive…
The Morphology of Dwarf Galaxies Hosting Variable Active Galactic Nuclei
Erin Kimbro, Vivienne Baldassare, Guy Worthey +2
We analyze Hubble Space Telescope (HST) optical imaging of eight low-mass galaxies hosting active galactic nuclei (AGN) identified via their photometric variability in \cite{baldas…
Merian: A Wide-Field Imaging Survey of Dwarf Galaxies at z~0.06-0.10
Shany Danieli, Erin Kado-Fong, Song Huang +32
We present the Merian Survey, an optical imaging survey optimized for studying the physical properties of bright star-forming dwarf galaxies. Merian is carried out with two medium-…
A Nonparametric Morphological Analysis of H Emission in Bright Dwarfs Using the Merian Survey
Abby Mintz, Jenny E. Greene, Erin Kado-Fong +10
Using medium-band imaging from the newly released Merian Survey, we conduct a nonparametric morphological analysis of H emission maps and stellar continua for a sample of galaxi…
Multi-wavelength constraints on the local black hole occupation fraction
Colin J. Burke, Priyamvada Natarajan, Vivienne F. Baldassare +1
The fraction of dwarf galaxies hosting central, intermediate-mass black holes (IMBHs) at low redshifts is an important observational probe of black hole seeding at high redshift. D…
Active Dwarf Galaxy Database I: Overlap between active galactic nuclei selected by different techniques
Erik J. Wasleske, Vivienne F. Baldassare
We assemble a sample of 733 dwarf galaxies () with signatures of active galactic nuclei (AGN) and explore the intersection between different A…
Intermediate-Mass Black Holes in Star Clusters and Dwarf Galaxies
Abbas Askar, Vivienne F. Baldassare, Mar Mezcua
Black holes (BHs) with masses between 100 to 100,000 times the mass of the Sun () are classified as intermediate-mass black holes (IMBHs), potentially representing…
The 50 Mpc Galaxy Catalog (50MGC): Consistent and Homogeneous Masses, Distances, Colors, and Morphologies
D. Ohlson, A. C. Seth, E. Gallo +2
We assemble a catalog of 15424 nearby galaxies within 50 Mpc with consistent and homogenized mass, distance, and morphological type measurements. Our catalog combines galaxies from…
X-ray Properties of Optically Variable Low-mass AGN Candidates
Alexander Messick, Vivienne Baldassare, Marla Geha +1
We present an X-ray analysis of fourteen nearby (z < 0.044) AGN in low mass galaxies (M_* <= 5*10^9 Msun) selected based on their optical variability (Baldassare et al. 2020). Comp…
X-ray Analysis of AGN from the GALEX Time Domain Survey
Erik J. Wasleske, Vivienne F. Baldassare
We analyze the X-ray properties for a sample of 23 high probability AGN candidates with ultraviolet variability identified in Wasleske et al. (2022). Using data from the Chandra X-…
The Merian Survey: Design, Construction, and Characterization of a Filter Set Optimized to Find Dwarf Galaxies and Measure their Dark Matter Halo Properties with Weak Lensing
Yifei Luo, Alexie Leauthaud, Jenny Greene +28
The Merian survey is mapping 850 degrees of the Hyper Suprime-Cam Strategic Survey Program (HSC-SSP) wide layer with two medium-band filters on the 4-meter Victor M. Bla…
Variable AGN in the GALEX Time Domain Survey
Erik J. Wasleske, Vivienne F. Baldassare, Christopher M. Carroll
We searched the Northern Hemisphere Fields of the GALEX Time-Domain Survey (TDS) for galaxies with UV variability indicative of active galactic nuclei (AGNs). We identified 48 high…
A Sample of Massive Black Holes in Dwarf Galaxies Detected via [Fe X] Coronal Line Emission: Active Galactic Nuclei and/or Tidal Disruption Events
M. Molina, A. E. Reines, L. J. Latimer +2
The massive black hole (BH) population in dwarf galaxies () can provide strong constraints on the origin of BH seeds. However, traditional optical…
Quasars That Have Transitioned from Radio-quiet to Radio-loud on Decadal Timescales Revealed by VLASS and FIRST
Kristina Nyland, Dillon Z. Dong, Pallavi Patil +21
We have performed a search over 3440 deg of Epoch 1 (2017-2019) of the Very Large Array Sky Survey to identify unobscured quasars in the optical () and obscured…
Nuclear X-ray Activity in Low-Surface-Brightness Galaxies: Prospects for Constraining the Local Black Hole Occupation Fraction with a Chandra Successor Mission
Edmund Hodges-Kluck, Elena Gallo, Anil Seth +2
About half of nearby galaxies have a central surface brightness >1 magnitude below that of the sky. The overall properties of these low-surface-brightness galaxies (LSBGs) remain u…
Populating the low-mass end of the relation
Vivienne F. Baldassare, Claire Dickey, Marla Geha +1
We present high resolution spectroscopy taken with the Keck Echellete Spectrograph and Imager to measure stellar velocity dispersions for eight active dwarf galaxies ($M_{\ast}<3\t…
Variable Radio AGN at High Redshift Identified in the VLA Sky Survey
Kristina Nyland, Dillon Dong, Pallavi Patil +11
As part of an on-going study of radio transients in Epoch 1 (2017-2019) of the Very Large Array Sky Survey (VLASS), we have discovered a sample of 0.2<z<3.2 active galactic nuclei…
The Curious Case of PHL 293B: A Long-Lived Transient in a Metal-Poor Blue Compact Dwarf Galaxy
Colin J. Burke, Vivienne F. Baldassare, Xin Liu +51
We report on small-amplitude optical variability and recent dissipation of the unusually persistent broad emission lines in the blue compact dwarf galaxy PHL 293B. The galaxy's unu…
The Seoul National University AGN monitoring project. II. BLR size and black hole mass of two AGNs
Suvendu Rakshit, Jong-Hak Woo, Elena Gallo +20
Active galactic nuclei (AGNs) show a correlation between the size of the broad line region (BLR) and the monochromatic continuum luminosity at 5100 Å, allowing black hole mass esti…
Detecting the Birth of Supermassive Black Holes Formed from Heavy Seeds
Fabio Pacucci, Vivienne Baldassare, Nico Cappelluti +11
In this white paper we explore the capabilities required to identify and study supermassive black holes formed from heavy seeds ($\mathrm{M_{\bullet}} \sim 10^4 - 10^6 \, \mathrm{M…