M. Gliozzi
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Measuring monster black hole masses: Maybe mighty, maybe merely massive Open
Context. Accurate black hole mass ( M BH ) measurements in high-redshift galaxies are difficult yet crucial to constrain the growth of supermassive BHs, and to discriminate between competing BH seed models. Recent studies claimed the detec…
View article: Exploring X-Ray Properties of Low-metallicity Dwarf Galaxies
Exploring X-Ray Properties of Low-metallicity Dwarf Galaxies Open
One of the primary outstanding questions in extragalactic astronomy is the formation and early evolution of the supermassive black holes that are seen in nearly every massive galaxy. Low-metallicity dwarf galaxies may offer the most repres…
View article: FRAMEx. V. Radio Spectral Shape at Central Subparsec Region of Active Galactic Nuclei
FRAMEx. V. Radio Spectral Shape at Central Subparsec Region of Active Galactic Nuclei Open
We present results from the Very Long Baseline Array multifrequency (1.6, 4.4, 8.6, and 22 GHz), high-sensitivity (∼25 μ Jy beam −1 ), subparsec-scale (<1 pc) observations and spectral energy distributions for a sample of 12 local active g…
Comparing indirect methods for black hole masses in AGN: the good, the bad, and the ugly Open
The black hole mass MBH is crucial in constraining the growth of supermassive black holes within their host galaxies. Since direct measurements of MBH with dynamical methods are restricted to a limited number of nearly quiescent nearby gal…
Comparing indirect methods for black hole masses in AGN: the good, the bad, and the ugly Open
The black hole mass MBH is crucial in constraining the growth of supermassive BHs within their host galaxies. Since direct measurements of MBH with dynamical methods are restricted to a limited number of nearly quiescent nearby galaxies an…
View article: FRAMEx. V. Radio Spectral Shape at Central Sub-parsec Region of AGNs
FRAMEx. V. Radio Spectral Shape at Central Sub-parsec Region of AGNs Open
We present results from the Very Long Baseline Array (VLBA) multi-frequency (1.6, 4.4, 8.6, 22 GHz), high-sensitivity (~25 microJy beam^-1), sub-parsec scale (<1 pc) observations and Spectral Energy Distributions (SEDs) for a sample of 12 …
View article: Exploring X-ray Properties of Low Metallicity Dwarf Galaxies
Exploring X-ray Properties of Low Metallicity Dwarf Galaxies Open
One of the primary outstanding questions in extragalactic astronomy is the formation and early evolution of the supermassive black holes that are seen in nearly every massive galaxy. Low metallicity dwarf galaxies may offer the most repres…
View article: Dataset to Exploring X-ray Properties of Low Metallicity Dwarf Galaxies
Dataset to Exploring X-ray Properties of Low Metallicity Dwarf Galaxies Open
MCMC chains from the LW2-LX relation in Exploring X-ray Properties of Low Metallicity Dwarf Galaxies. In press at ApJ.
View article: Dataset to Exploring X-ray Properties of Low Metallicity Dwarf Galaxies
Dataset to Exploring X-ray Properties of Low Metallicity Dwarf Galaxies Open
MCMC chains from the LW2-LX relation in Exploring X-ray Properties of Low Metallicity Dwarf Galaxies. In press at ApJ.
View article: NuSTAR Observations of Four Mid-IR–Selected Dual AGN Candidates in Galaxy Mergers
NuSTAR Observations of Four Mid-IR–Selected Dual AGN Candidates in Galaxy Mergers Open
Mergers of galaxies are a ubiquitous phenomenon in the universe and represent a natural consequence of the “bottom-up” mass accumulation and galaxy evolution cosmological paradigm. It is generally accepted that the peak of active galactic …
View article: NuSTAR Observations of Four Mid-IR Selected Dual AGN Candidates in Galaxy Mergers
NuSTAR Observations of Four Mid-IR Selected Dual AGN Candidates in Galaxy Mergers Open
Mergers of galaxies are a ubiquitous phenomenon in the Universe and represent a natural consequence of the ``bottom-up'' mass accumulation and galaxy evolution cosmological paradigm. It is generally accepted that the peak of AGN accretion …
Assessing indirect methods to determine black hole masses using NGC 4151 Open
Accurately determining the black hole mass ($M_\mathrm{BH}$) in active galactic nuclei (AGN) is crucial to constraining their properties and to studying their evolution. While direct methods yield reliable measurements of $M_\mathrm{BH}$ i…
View article: NuSTAR Observes Two Bulgeless Galaxies: No Hard X-Ray AGN Detected in NGC 4178 or J0851+3926
NuSTAR Observes Two Bulgeless Galaxies: No Hard X-Ray AGN Detected in NGC 4178 or J0851+3926 Open
The discovery over the last several decades of low- and moderate-luminosity active galactic nuclei (AGNs) in disk-dominated galaxies—which show no “classical” bulges—suggests that secular mechanisms represent an important growth pathway fo…
View article: NuSTAR Observes Two Bulgeless Galaxies: No Hard X-ray AGN Detected in NGC 4178 or J0851+3926
NuSTAR Observes Two Bulgeless Galaxies: No Hard X-ray AGN Detected in NGC 4178 or J0851+3926 Open
The discovery over the last several decades of moderate luminosity AGNs in disk-dominated galaxies - which show no "classical" bulges - suggests that secular mechanisms represent an important growth pathway for supermassive black holes in …
FRAMEx. III. Radio Emission in the Immediate Vicinity of Radio-quiet AGNs Open
We present follow-up results from the first Fundamental Reference AGN Monitoring Experiment (FRAMEx) X-ray/radio snapshot program of a volume-complete sample of local hard X-ray-selected active galactic nuclei (AGNs). Here, we added nine n…
Fundamental Reference AGN Monitoring Experiment (FRAMEx) III: Radio Emission in the Immediate Vicinity of Radio Quiet AGNs Open
We present follow-up results from the first Fundamental Reference AGN Monitoring Experiment (FRAMEx) X-ray/radio snapshot program of a volume-complete sample of local hard X-ray-selected active galactic nuclei (AGNs). Here, we added 9 new …
Estimating black hole masses in obscured AGN using X-rays Open
Determining the black hole masses in active galactic nuclei (AGN) is of crucial importance to constrain the basic characteristics of their central engines and shed light on their growth and co-evolution with their host galaxies. While the …
The soft X-ray excess: NLS1s versus BLS1s Open
The soft X-ray excess – the excess of X-rays below 2 keV with respect to the extrapolation of the hard X-ray spectral continuum model – is a very common feature among type 1 active galactic nuclei (AGNs); yet the nature of the soft X-ray e…
Are NLS1s highly accreting low black hole mass AGNs? Open
In this work, we test the hypothesis that narrow-line Seyfert 1 galaxies (NSL1s) are active galactic nuclei in their early phase and are therefore younger and more active than the more common broad-line Seyfert 1 galaxies (BLS1s). If that …
View article: The Hunt for Intermediate-mass Black Holes in the JWST Era
The Hunt for Intermediate-mass Black Holes in the JWST Era Open
Intermediate-mass black holes (IMBHs), with masses between 100–10 5 M ⊙ , fill the gap between stellar mass black holes and the supermassive black holes that reside in galaxy centers. While IMBHs are crucial to our understanding of black h…
Measuring the black hole mass in ultraluminous X-ray sources with the X-ray scaling method Open
In our recent work, we demonstrated that a novel X-ray scaling method,\noriginally introduced for Galactic black holes, could be reliably extended to\nestimate the mass of supermassive black holes accreting at moderate to high\nlevel. Here…
Measuring the black hole mass in Ultraluminous X-ray Sources with the X-ray Scaling Method Open
In our recent work, we demonstrated that a novel X-ray scaling method, originally introduced for Galactic black holes, could be reliably extended to estimate the mass of supermassive black holes accreting at moderate to high level. Here, w…
Course (Re)Design Academy: Redesigning an Introductory Astronomy Course with Open Resources Open
I will summarize my experience in the first Course (Re)Design Academy (CRA) organized by the Center for Teaching and Faculty Excellence (CTFE). I will start with my expectations (to substitute a good but expensive astronomy book and intera…
Activity: Acrostic crossword Open
The acrostic crossword is an activity that I have developed for my introductory astronomy classes to test the students understanding of basic concepts and vocabulary learned in the course. Working in small groups, the students guess and wr…
Long-term monitoring of Ark 120 with<i>Swift</i> Open
We report the results of a six-month Swift monitoring campaign of Ark120, a\nprototypical bare Seyfert1 galaxy. The lack of intrinsic absorption combined\nwith the nearly contemporaneous coverage of the UV and X-ray bands makes it\npossibl…