Alister W. Graham
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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: Supermassive black hole mass measurement in the spiral galaxy NGC 4736 using JWST/NIRSpec stellar kinematics
Supermassive black hole mass measurement in the spiral galaxy NGC 4736 using JWST/NIRSpec stellar kinematics Open
We present accurate mass measurements of the central supermassive black hole (SMBH) in NGC 4736 (M 94). We used the “gold-standard” stellar absorption features (CO band heads) at ∼2.3 μm, as opposed to gas emission lines, to trace the dyna…
View article: Supermassive black hole mass measurement in the spiral galaxy NGC 4736 Using JWST/NIRSpec stellar kinematics
Supermassive black hole mass measurement in the spiral galaxy NGC 4736 Using JWST/NIRSpec stellar kinematics Open
We present accurate mass measurements of the central supermassive black hole (SMBH) in NGC 4736 (M 94).\ We used the ``gold-standard" stellar absorption features (CO band heads) at $\sim$2.3 ${\rm μm}$, as opposed to gas emission lines, to…
View article: $R_{\rm e}$. II. Understanding the IC 3475 galaxy type, including ultra-diffuse galaxy, structural scaling relations
$R_{\rm e}$. II. Understanding the IC 3475 galaxy type, including ultra-diffuse galaxy, structural scaling relations Open
It is explained why relatively gas-poor ultra-diffuse galaxies (UDGs), a subset of IC 3475 galaxy types, do not have unexpectedly large sizes but large sizes that are in line with expectations from the curved size-luminosity relation defin…
View article: Multiwavelength Study of a Hyperluminous X-Ray Source near NGC 6099: A Strong IMBH Candidate
Multiwavelength Study of a Hyperluminous X-Ray Source near NGC 6099: A Strong IMBH Candidate Open
We report on the intriguing properties of a variable X-ray source projected at the outskirts of the elliptical galaxy NGC 6099 ( d ≈ 139 Mpc). If truly located near NGC 6099, this is a hyperluminous X-ray source that reached an X-ray lumin…
View article: Dot to dot: high-$z$ little red dots in $M_{\rm bh}$-$M_{\rm \star}$ diagrams with galaxy-morphology-specific scaling relations
Dot to dot: high-$z$ little red dots in $M_{\rm bh}$-$M_{\rm \star}$ diagrams with galaxy-morphology-specific scaling relations Open
The high redshift 'little red dots' (LRDs) detected with the James Webb Space Telescope are considered to be the cores of emerging galaxies that host active galactic nuclei (AGN). For the first time, we compare LRDs with local compact stel…
View article: Multi-wavelength study of a hyperluminous X-ray source near NGC 6099: a strong IMBH candidate
Multi-wavelength study of a hyperluminous X-ray source near NGC 6099: a strong IMBH candidate Open
We report on the intriguing properties of a variable X-ray source projected at the outskirts of the elliptical galaxy NGC 6099 ($d \approx 139$ Mpc). If truly located near NGC 6099, this is a hyperluminous X-ray source that reached an X-ra…
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), a central challenge in modern cosmology. To date only small samples of intermediate-mass black hol…
View article: Dot to dot: High-<i>z</i> little red dots in $M_\mathrm{ bh}$–$M_\mathrm{ \star}$ diagrams with galaxy-morphology-specific scaling relations
Dot to dot: High-<i>z</i> little red dots in $M_\mathrm{ bh}$–$M_\mathrm{ \star}$ diagrams with galaxy-morphology-specific scaling relations Open
The high redshift ‘little red dots’ (LRDs) detected with the James Webb Space Telescope are considered to be the cores of emerging galaxies that host active galactic nuclei (AGN). For the first time, we compare LRDs with local compact stel…
View article: $R_\textrm{e}$. II. Understanding IC 3475 galaxy type (including ultra-diffuse galaxy) structural scaling relations
$R_\textrm{e}$. II. Understanding IC 3475 galaxy type (including ultra-diffuse galaxy) structural scaling relations Open
It is explained why relatively gas-poor ultra-diffuse galaxies (UDGs), a subset of IC 3475 galaxy types, do not have unexpectedly large sizes but large sizes that are in line with expectations from the curved size-luminosity relation defin…
View article: Early-type galaxy speciation: elliptical (E) and ellicular (ES) galaxies in the <i>M</i>bh–<i>M</i>*,sph diagram, and a merger-driven explanation for the origin of ES galaxies, antitruncated stellar discs in lenticular (S0) galaxies, and the Sérsicification of E galaxy light profiles
Early-type galaxy speciation: elliptical (E) and ellicular (ES) galaxies in the <i>M</i>bh–<i>M</i>*,sph diagram, and a merger-driven explanation for the origin of ES galaxies, antitruncated stellar discs in lenticular (S0) galaxies, and the Sérsicification of E galaxy light profiles Open
In a recent series of papers, supermassive black holes were used to discern pathways in galaxy evolution. By considering the black holes’ coupling with their host galaxy’s bulge/spheroid, the progression of mass within each component has s…
View article: Identification of Intermediate-mass Black Hole Candidates among a Sample of Sd Galaxies
Identification of Intermediate-mass Black Hole Candidates among a Sample of Sd Galaxies Open
We analyzed images of every northern hemisphere Sd galaxy listed in the Third Reference Catalogue of Bright Galaxies with a relatively face-on inclination ( θ ≤ 30°). Specifically, we measured the spiral arms’ winding angle, ϕ , in 85 gala…
View article: Identification of Intermediate-mass Black Hole Candidates Among a Sample of Sd Galaxies
Identification of Intermediate-mass Black Hole Candidates Among a Sample of Sd Galaxies Open
We analyzed images of every northern hemisphere Sd galaxy listed in the Third Reference Catalogue of Bright Galaxies (RC3) with a relatively face-on inclination ($θ\leq30°$). Specifically, we measured the spiral arms' winding angle, $ϕ$, i…
View article: Repainting the colour–mass diagrams by unearthing the green mountain: dust-rich S0 galaxies in the colour–(galaxy stellar mass) diagram, and the colour–(black hole mass) relations for dust-poor versus dust-rich galaxies
Repainting the colour–mass diagrams by unearthing the green mountain: dust-rich S0 galaxies in the colour–(galaxy stellar mass) diagram, and the colour–(black hole mass) relations for dust-poor versus dust-rich galaxies Open
Lenticular galaxies are notoriously misclassified as elliptical galaxies and, as such, a (disc inclination)-dependent correction for dust is often not applied to the magnitudes of dusty lenticular galaxies. This results in overly red galax…
View article: Repainting the colour-mass diagrams by unearthing the green mountain: dust-rich S0 galaxies in the colour-(galaxy stellar mass) diagram, and the colour-(black hole mass) relations for dust-poor versus dust-rich galaxies
Repainting the colour-mass diagrams by unearthing the green mountain: dust-rich S0 galaxies in the colour-(galaxy stellar mass) diagram, and the colour-(black hole mass) relations for dust-poor versus dust-rich galaxies Open
Lenticular galaxies are notoriously misclassified as elliptical galaxies and, as such, a (disc inclination)-dependent correction for dust is often not applied to the magnitudes of dusty lenticular galaxies. This results in overly red galax…
View article: Erratum: Appreciating mergers for understanding the non-linear <i>M</i>bh–<i>M</i>*,spheroid and <i>M</i>bh–<i>M</i>*,galaxy relations, updated herein, and the implications for the (reduced) role of AGN feedback
Erratum: Appreciating mergers for understanding the non-linear <i>M</i>bh–<i>M</i>*,spheroid and <i>M</i>bh–<i>M</i>*,galaxy relations, updated herein, and the implications for the (reduced) role of AGN feedback Open
View article: JASMINE: Near-infrared astrometry and time-series photometry science
JASMINE: Near-infrared astrometry and time-series photometry science Open
The Japan Astrometry Satellite Mission for INfrared Exploration (JASMINE) is a planned M-class science space mission by the Institute of Space and Astronautical Science, the Japan Aerospace Exploration Agency. JASMINE has two main science …
View article: Attenuation proxy hidden in surface brightness – colour diagrams
Attenuation proxy hidden in surface brightness – colour diagrams Open
Aims. Large future sky surveys, such as the Legacy Survey of Space and Time ( LSST ), will provide optical photometry for billions of objects. Reliable estimation of the physical properties of galaxies requires information about dust atten…
View article: Attenuation proxy hidden in surface brightness-colour diagrams. A new strategy for the LSST era
Attenuation proxy hidden in surface brightness-colour diagrams. A new strategy for the LSST era Open
Large future sky surveys, such as the LSST, will provide optical photometry for billions of objects. This paper aims to construct a proxy for the far ultraviolet attenuation (AFUVp) from the optical data alone, enabling the rapid estimatio…
View article: The Millennium Galaxy Catalogue: science highlights
The Millennium Galaxy Catalogue: science highlights Open
The Millennium Galaxy Catalogue (MGC) provides a structural database comprising 10,095 well resolved galaxies drawn from a 37.5 sq degree region of sky, with BMGC < 20.0 mag and 96.1 per cent spectroscopic completeness. The data are being …
View article: The local supermassive black hole mass density: Corrections for dependencies on the Hubble constant
The local supermassive black hole mass density: Corrections for dependencies on the Hubble constant Open
We have investigated past measurements of the local supermassive black hole mass density, correcting for hitherto unknown dependencies on the Hubble constant, which, in some cases, had led to an underestimation of the mass density by facto…
View article: Re. I. Understanding galaxy sizes, associated luminosity densities, and the artificial division of the early-type galaxy population – CORRIGENDUM
Re. I. Understanding galaxy sizes, associated luminosity densities, and the artificial division of the early-type galaxy population – CORRIGENDUM Open
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View article: An outer disk in the 'Compact elliptical' galaxy M32
An outer disk in the 'Compact elliptical' galaxy M32 Open
The surface brightness profile, velocity dispersion measurement, and estimated supermassive black hole (SMBH) mass in the prototype 'compact elliptical' galaxy M32 are inconsistent with the galaxy having, and probably ever having had, an r…
View article: The distribution of disks in the μ0-log h plane and the inclination correction
The distribution of disks in the μ0-log h plane and the inclination correction Open
A further fundamental modification needs to be made to the Freeman (1970) law, such that not only do LSB galaxies possess fainter central surface brightnesses than the canonical Freeman value, but the upper limit is in fact an upper (brigh…
View article: The fundamental properties of dwarf elliptical galaxies in clusters
The fundamental properties of dwarf elliptical galaxies in clusters Open
We present preliminary results of an extensive study of the fundamental properties of dwarf elliptical galaxies (dEs) in the Coma cluster. Our study will combine HST surface photometry with ground-based UBRIJK photometry and optical spectr…
View article: Comment on: A supermassive black hole fundamental plane for ellipticals
Comment on: A supermassive black hole fundamental plane for ellipticals Open
This paper is a response to an earlier article: Barway, S., & Kembhavi, A. (2007). A supermassive black hole fundamental plane for ellipticals. Astrophysical Journal, 662: L67-L70 (http://dx.doi.org/10.1086/519560). A simple regression ana…
View article: NGC 1428: from the discordant redshifts caused by a star, to the determination of the morphological type.
NGC 1428: from the discordant redshifts caused by a star, to the determination of the morphological type. Open
We summarise the main results of our study of NGC 1428, an early-type galaxy belonging to the Fornax cluster. By means of long-slit spectroscopic data we study it's kinematics and also solve the problems connected to a star superimposed on…
View article: Variable mass structure and the Fundamental Plane
Variable mass structure and the Fundamental Plane Open
We examine the influence of broken structural homology upon the Fundamental Plane (FP). We fit the Sersic R1/n law, being the generalized R1/4 law, where 'n' is a free parameter that accommodates structural differences between different ga…
View article: A correlation between supermassive black hole mass and galaxy light concentration
A correlation between supermassive black hole mass and galaxy light concentration Open
The varying global distribution of stars, or specifically, their concentration Cr_e, within elliptical galaxies and spiral galaxy bulges is intimately related to the mass of their central supermassive black holes (Mbh), such that log (Mbh/…
View article: Empirical models for dark matter halos. I. Nonparametric construction of density profiles and comparison with parametric models
Empirical models for dark matter halos. I. Nonparametric construction of density profiles and comparison with parametric models Open
We use techniques from nonparametric function estimation theory to extract the density profiles, and their derivatives, from a set of N-body dark matter halos. We consider halos generated from ΛCDM simulations of gravitational clustering, …