A5043398638- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- History and Developments in Astronomy
- Dark Matter and Cosmic Phenomena
- Scientific Research and Discoveries
- Black Holes and Theoretical Physics
- Relativity and Gravitational Theory
- Cosmology and Gravitation Theories
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Radio Astronomy Observations and Technology
- Advanced Fluorescence Microscopy Techniques
- Astrophysics and Cosmic Phenomena
- Advanced Vision and Imaging
- Phase Equilibria and Thermodynamics
- Plant Water Relations and Carbon Dynamics
- Spectroscopy and Chemometric Analyses
- History and Theory of Mathematics
- Astro and Planetary Science
- Radiation Detection and Scintillator Technologies
- Remote Sensing in Agriculture
- Advanced Image Processing Techniques
University of Toledo
2022
University of Minnesota, Duluth
2014-2019
University of Arkansas at Little Rock
2007-2015
Astronomy and Space
2015
University of Arkansas at Fayetteville
2008-2014
University of California, Los Angeles
2013
European Southern Observatory
2009
Observatoire de Paris
2009
Janssen (Switzerland)
2009
Galaxies, Etoiles, Physique et Instrumentation
2009
We present the maps, source catalogue and number counts of largest, most complete unbiased extragalactic submillimetre survey ever undertaken: 850-micron SCUBA HAlf Degree Extragalactic Survey (SHADES). Using Submillimetre Common-User Bolometer Array (SCUBA) on James Clerk Maxwell Telescope (JCMT), SHADES mapped two separate regions sky: Subaru/XMM-Newton Deep Field (SXDF) Lockman Hole East (LH). These maps cover 720 square arcmin with an RMS noise level about 2 mJy have uncovered >100...
Determining an accurate position for a submillimetre (submm) galaxy (SMG) is the crucial step that enables us to move from basic properties of SMG sample – source counts and 2D clustering assessment their detailed, multiwavelength properties, contribution history cosmic star formation links with present-day populations. In this paper, we identify robust radio and/or infrared (IR) counterparts, hence positions, over two-thirds SCUBA HAlf-Degree Extragalactic Survey (SHADES) Source Catalogue,...
We have analysed deep R-band images, down to a limiting surface brightness of 26.5 R-mag arcsec$^{-2}$ (equivalent ~28 B-mag arcsec$^{-2}$), 5 cD galaxies determine the shape profiles their extended stellar envelopes. Both de Vaucouleurs R^{1/4} model and Sersic's R^{1/n} model, on own, provide poor description galaxies. This is due presence outer envelopes, thought accumulated over merger history central cluster galaxy also from tidal stripping at larger radii. therefore simultaneously fit...
The Carnegie-Irvine Galaxy Survey (CGS) is a long-term program to investigate the photometric and spectroscopic properties of statistically complete sample 605 bright (B_T < 12.9 mag), southern (Dec. 0) galaxies using facilities at Las Campanas Observatory. This paper, first in series, outlines scientific motivation CGS, defines sample, describes technical aspects optical broadband (BVRI) imaging component survey, including details observing program, data reduction procedures, calibration...
We present photometry and spectroscopy of the afterglow GRB 030323. VLT spectra show damped Lyα (DLA) absorption low- high-ionization lines at a redshift . The inferred neutral hydrogen column density, , is larger than any (GRB- or QSO-) DLA density directly from in absorption. From photometry, we derive conservative upper limit to host-galaxy extinction: mag. iron abundance while metallicity gas as measured sulphur an on H2 molecular fraction In trough, emission line detected, which...
JHK photometry in the Mauna Kea Observatory (MKO) near-IR system is presented for 115 stars. Of these, 79 are UKIRT standards and 42 LCO standards. The average brightness 11.5 mag, with a range of 10 to 15. number nights each star was observed 4, internal error final results 0.011 mag. These data agree those reported by other groups 0.02 measurements used derive transformations between MKO photometric UKIRT, 2MASS systems. 2MASS-MKO scatter 0.05 mag redder stars: 2MASS-J includes H2O...
A logarithmic spiral is a prominent feature appearing in majority of observed galaxies. This has long been associated with the traditional Hubble classification scheme, but historical quotes pitch angle galaxies have almost exclusively qualitative. We developed methodology, utilizing two-dimensional fast Fourier transformations images galaxies, order to isolate and measure angles their arms. Our technique provides quantitative way this morphological feature. will allow comparison galaxy...
We have conducted an image analysis of the (current) full sample 44 spiral galaxies with directly measured supermassive black hole (SMBH) masses, $M_{\rm BH}$, to determine each galaxy's logarithmic arm pitch angle, $\phi$. For predicting we derived relation: $\log({M_{\rm BH}/{\rm M_{\odot}}}) = (7.01\pm0.07) - (0.171\pm0.017)[|\phi|-15\deg]$. The total root mean square scatter associated this relation is 0.43 dex in $\log{M_{\rm BH}}$ direction, intrinsic $0.33\pm0.08$ dex. BH}$-$\phi$...
This is the first of two papers where we present analysis an HST/NICMOS2 near-infrared (NIR) snapshot survey in F160W (H) filter for a sample 78 spiral galaxies selected from UGC and ESOLV catalogs. For 69 these objects provide nuclear color information derived by combining H data either with additional NICMOS F110W (J) images or V WFPC2/HST data. Here NIR optical-NIR maps. We focus our attention on properties photometrically distinct "nuclei" which are found embedded most measurements their...
We present the redshift distribution of Submillimetre Common-User Bolometer Array (SCUBA) Half Degree Survey (SHADES) galaxy population based on rest-frame radio–mm–far-infrared (FIR) colours 120 robustly detected 850 μm sources in Lockman Hole East (LH) and Subaru XMM–Newton Deep Field (SXDF). The derived from full spectral energy (SED) information is shown to be narrower than that determined radio–sub-mm index, as more photometric bands contribute a higher accuracy. at least two peaks z≈...
We present a relationship between spiral arm pitch angle (a measure of the tightness structure) and mass supermassive black holes (BHs) in nuclei disk galaxies. argue that this is expected through combination other relationships, whose existence has already been demonstrated. The recent discovery AGN bulgeless galaxies suggests halo concentration or virial may be one determining factors BH mass. Taken together with result seems to determine angle, would expect relation exist galaxies, we...
We present data for a sample of 45 spiral galaxies over range Hubble types, imaged in the near-IR JK bands. Parameters are calculated describing bulge, disc and bar K-band light distributions, we look correlations showing interrelation between these components.
The SCUBA HAlf Degree Extragalactic Survey (SHADES) is a major blank-field extragalactic sub-mm survey underway at the James Clerk Maxwell telescope.SHADES aims to cover half square degree 450+850microns 4sigma depth of ~8mJy 850microns. Two fields are being observed, Subaru/XMM--Newton Deep Field (SXDF) and Lockman Hole East. has 3 main investigate: i) cosmic history massive dust enshrouded star-formation activity, ii) clustering properties sub-mm-selected galaxies in order determine...
In the course of our survey outer halo Andromeda galaxy we have discovered a remote, possible satellite that system at projected 162 kpc (11.7°) radius. The fairly elongated (0.31 ± 0.09 ellipticity) dwarf can be fit with King profile 1.07 (d/784 kpc) limiting radius, where distance, d, is estimated ~630-850 from tip red giant branch. newfound galaxy, "Andromeda XIV" ("And XIV"), distinguishes itself other Local Group galaxies by its extreme dynamics; Keck/DEIMOS spectroscopy reveals it to...
We present an updated mass model for M31 that makes use of a Spitzer 3.6 $μ$m image, mass-to-light ratio gradient based on the galaxy's B-R colour profile, and observed rotation curve data from variety sources. examine cases where dark matter follows pure NFW profile initial halo contracts adiabatically in response to formation galaxy. find both these scenarios can produce reasonable fit data. However, requires concentration c_{vir}=51 is well outside range predicted LCDM cosmology therefore...
We have analyzed V, H, and J Hubble Space Telescope (HST) images for a sample of early- to late-type spiral galaxies reported elsewhere the statistical frequency R1/4-law exponential bulges in our as function type occurrence structural properties resolved central nuclei hosted by intermediate- disks (see references text). Here we use these data show following:
We investigate the use of spiral arm pitch angles as a probe disk galaxy mass profiles. confirm our previous result that (P) are well correlated with rate shear (S) in rotation curves by using much larger sample (51 galaxies) than used previously (17 galaxies). this correlation to argue imaging data alone can provide powerful galactic distributions out large look-back times. In contrast work, we show observed similar when measured optical (at 0.4 μm) and near-infrared 2.1 mean difference 23...
We present new and stronger evidence for a previously reported relationship between galactic spiral arm pitch angle P (a measure of the tightness structure) mass M_BH disk galaxy's nuclear supermassive black hole (SMBH). use an improved method to accurately in galaxies generate quantitative data on this morphological feature 34 with directly measured masses. find relation log(M/M_sun) = (8.21 +/- 0.16) - (0.062 0.009)P. This is compared other means estimating determine its effectiveness...
ABSTRACT We present a determination of the supermassive black hole (SMBH) mass function for early- and late-type galaxies in nearby universe ( z < 0.0057), established from volume-limited sample consisting statistically complete collection brightest spiral southern hemisphere. The is defined by limiting luminosity (redshift-independent) distance, D L = 25.4 Mpc, absolute B-band magnitude, <?CDATA ${{\mathfrak{M}}}_{B}=-19.12$?> . These limits define 140 spiral, 30 elliptical (E), 38...
We present L'and M' photometry, obtained at UKIRT using the Mauna Kea Observatories Near-IR filter set, for 46 and 31 standard stars, respectively. The L' standards include 25 from in-house "Bright Standards" with magnitudes deriving Elias et al. (1982) observations IRTF in early 1980s, 21 fainter stars. derive results of Sinton & Tittemore (1984). estimate average external error to be 0.015 mag bright 0.025 standards, 0.026 standards. new provide a network homogeneously observed...
In the last decade, near-infrared imaging has highlighted decoupling of gaseous and old stellar discs: morphologies optical (Population I) tracers compared to disc morphology, can be radically different. Galaxies which appear multi-armed even flocculent in may show significant grand-design spirals near-infrared. Furthermore, optically determined Hubble classification scheme does not provide a sound way classifying dust-penetrated spiral arm pitch angles (when measured near-infrared) do...
We have imaged a sample of 20 spiral galaxies in Hα and the near-infrared K band (2.2 μm), order to determine location strength star formation these objects with respect perturbations old stellar population. found that rates are significantly enhanced vicinity K-band arms. also this enhancement rate arm regions correlates well quantity measures relative strengths shocks Assuming light is dominated by emission from population, shows density waves trigger
We study the spiral arm morphology of a sample local galaxies in Illustris simulation and explore supermassive black hole - galaxy connection beyond bulge (e.g., pitch angle, total stellar mass, dark matter halo mass), finding good agreement with other theoretical studies observational constraints. It is important to properties holes their host through both observations simulations compare results order understand physics formative histories.We find that prediction for mass relative angle...
We present our determination of the nuclear supermassive black hole (SMBH) mass function for spiral galaxies in Local Universe, established from a volume-limited sample consisting statistically complete collection brightest Southern Hemisphere. Our SMBH agrees well at high-mass end with previous values given literature. At low-mass end, inconsistencies exist works that still need to be resolved, but work is more line expectations based on modeling evolution. This spectrum critical...