104 citations · 697 across the 23 of their papers we have counts for
23 papers
The haloes and environments of nearby galaxies (HERON) -- III. A 45 kpc spiral structure in the GLSB galaxy UGC 4599
Aleksandr V. Mosenkov, R. Michael Rich, Michael Fusco +10
We use a 0.7-m telescope in the framework of the Halos and Environments of Nearby Galaxies (HERON) survey to probe low surface brightness structures in nearby galaxies. One of our…
Probing the Low-mass End of the Black Hole Mass Function via a Study of Faint Local Spiral Galaxies
Michael S. Fusco, Benjamin L. Davis, Julia Kennefick +2
We present an analysis of the pitch angle distribution function (PADF) for nearby galaxies and its resulting black hole mass function (BHMF) via the well-known relationship between…
On The Hydrosphere Stability of TESS Targets: Applications to 700 d, 256 b, and 203 b
Paul Bonney, Julia Kennefick
A main determinant of the habitability of exoplanets is the presence of stable liquid surface water. In an era of abundant possible targets, the potential to find a habitable world…
Evidence in favour of density wave theory through star formation history maps and spatially resolved stellar clusters
Shameer Abdeen, Daniel Kennefick, Julia Kennefick +7
Stationary Density Wave Theory predicts the existence of an age gradient across the spiral arms with a phase crossing at the co-rotation radius. Using star formation history (SFH)…
Determining the Co-Rotation Radii of Spiral Galaxies Using Spiral Arm Pitch Angle Measurements at Multiple Wavelengths
Shameer Abdeen, Daniel Kennefick, Julia Kennefick +4
The spiral arms spanning disk galaxies are believed to be created by density waves that propagate through galactic disks. We present a novel method of finding the co-rotation radiu…
Investigating the Origins of Spiral Structure in Disk Galaxies through a Multiwavelength Study
Ryan Miller, Daniel Kennefick, Julia Kennefick +5
The density-wave theory of spiral structure proposes that star formation occurs in or near a spiral-shaped region of higher density that rotates rigidly within the galactic disk at…
The Halos and Environments of Nearby Galaxies (HERON) I: Imaging, Sample Characteristics, and Envelope Diameters
R. Michael Rich, Aleksandr Mosenkov, Henry Lee-Saunders +16
We use a dedicated 0.7-m telescope to image the halos of 119 galaxies in the Local Volume to mag/arcsec. The sample is primarily from the 2MASS Large Galaxy At…
The Halos and Environments of Nearby Galaxies (HERON) Survey
R. Michael Rich, Noah Brosch, James Bullock +7
We have used dedicated 0.7m telescopes in California and Israel to image the halos of ~200 galaxies in the Local Volume to 29 mag/sq arcsec, the sample mainly drawn from the 2MASS…
Strong Evidence for the Density-wave Theory of Spiral Structure in Disk Galaxies
Hamed Pour-Imani, Daniel Kennefick, Julia Kennefick +3
The density-wave theory of galactic spiral-arm structure makes a striking prediction that the pitch angle of spiral arms should vary with the wavelength of the galaxy's image. The…
Spirality: A Novel Way to Measure Spiral Arm Pitch Angle
Douglas W. Shields, Benjamin Boe, Casey Pfountz +6
We present the MATLAB code Spirality, a novel method for measuring spiral arm pitch angles by fitting galaxy images to spiral templates of known pitch. Computation time is typicall…
A Fundamental Plane of Spiral Structure in Disk Galaxies
Benjamin L. Davis, Daniel Kennefick, Julia Kennefick +7
Spiral structure is the most distinctive feature of disk galaxies and yet debate persists about which theory of spiral structure is the correct one. Many versions of the density wa…
The Black Hole Mass Function Derived from Local Spiral Galaxies
Benjamin L. Davis, Joel C. Berrier, Lucas Johns +6
We present our determination of the nuclear supermassive black hole (SMBH) mass function for spiral galaxies in the Local Universe, established from a volume-limited sample consist…
Further Evidence for a Supermassive Black Hole Mass - Pitch Angle Relation
Joel C. Berrier, Benjamin L. Davis, Daniel Kennefick +7
We present new and stronger evidence for a previously reported relationship between galactic spiral arm pitch angle P (a measure of the tightness of spiral structure) and the mass…
Identification of Outflows and Candidate Dual Active Galactic Nuclei in SDSS Quasars at z=0.8-1.6
R. Scott Barrows, Claud H. Sandberg Lacy, Julia Kennefick +3
We present a sample of 131 quasars from the Sloan Digital Sky Survey at redshifts 0.8<z<1.6 with double peaks in either of the high-ionization narrow emission lines [NeV]3426 or [N…
On the Link Between Central Black Holes, Bar Dynamics, and Dark Matter Halos in Spiral Galaxies
Patrick Treuthardt, Marc S. Seigar, Amber D. Sierra +5
The discovery of a relationship between supermassive black hole (SMBH) mass and spiral arm pitch angle (P) is evidence that SMBHs are tied to the overall secular evolution of a gal…
Measurement of Galactic Logarithmic Spiral Arm Pitch Angle Using Two-Dimensional Fast Fourier Transform Decomposition
Benjamin L. Davis, Joel C. Berrier, Douglas W. Shields +5
A logarithmic spiral is a prominent feature appearing in a majority of observed galaxies. This feature has long been associated with the traditional Hubble classification scheme, b…
Unusual Double-peaked Emission in the SDSS Quasar J093201.60+031858.7
R. Scott Barrows, Claud H. Sandberg Lacy, Daniel Kennefick +2
We examine spectral properties of the SDSS quasar J093201.60+031858.7, in particular the presence of strong blue peaks in the Balmer emission lines offset from the narrow lines by…
Infrared Imaging of SDSS Quasars: Implications for the Quasar K correction
Julia Kennefick, Shelly Bursick
We have imaged 45 quasars from the Sloan Digital Sky Survey (SDSS) with redshifts 1.85 < z < 4.26 in JHKs with the KPNO SQIID imager. By combining these data with optical magnitude…
Discovery of a relationship between spiral arm morphology and supermassive black hole mass in disk galaxies
Marc S. Seigar, Daniel Kennefick, Julia Kennefick +1
We present a relationship between spiral arm pitch angle (a measure of the tightness of spiral structure) and the mass of supermassive black holes (BHs) in the nuclei of disk galax…
The BTC40 Survey for Quasars at 4.8 < z < 6
E. M. Monier, J. D. Kennefick, P. B. Hall +4
The BTC40 Survey for high-redshift quasars is a multicolor search using images obtained with the Big Throughput Camera (BTC) on the CTIO 4-m telescope in V, I, and z filters to sea…
Quasar Candidates in the Hubble Deep Field
Alberto Conti, Julia D. Kennefick, Paul Martini +1
We focus on the search for unresolved faint quasars and AGN in the crude combine images using a multicolor imaging analysis that has proven very successful in recent years. Quasar…
A Deep Multicolor Survey. IV. The Electronic Stellar Catalog
Patrick S. Osmer, Julia D. Kennefick, Patrick B. Hall +1
We make available in electronic form the stellar catalog of 19,494 objects from the Deep Multicolor Survey (DMS). The DMS is based on CCD imaging with the Mayall 4-m telescope in U…
A Deep Multicolor Survey. III. Additional Spectroscopy and Implications for the Number Counts of Faint Quasars
Julia D. Kennefick, Patrick S. Osmer, Patrick B. Hall +1
We have made spectroscopic identifications of 39 additional quasar candidates from the Deep Multicolor Survey (DMS) of Hall et al. (1996, ApJ, 462, 614, astro-ph/9512052). We have…