A5006063548- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Calibration and Measurement Techniques
- CCD and CMOS Imaging Sensors
- Adaptive optics and wavefront sensing
- Solar and Space Plasma Dynamics
- Scientific Research and Discoveries
- Radio Astronomy Observations and Technology
- Toxic Organic Pollutants Impact
- Infrared Target Detection Methodologies
- Cosmology and Gravitation Theories
- Ionosphere and magnetosphere dynamics
- Medical Imaging Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Superconducting and THz Device Technology
- Flame retardant materials and properties
- Particle Detector Development and Performance
- Black Holes and Theoretical Physics
- Spectroscopy and Laser Applications
- Astro and Planetary Science
University of The Sacred Heart
2022-2023
Northwest Research Associates
2018-2023
Bradley University
2018
Virginia Tech
2013-2017
Public Policy Institute of California
2016-2017
University of California, Los Angeles
2011-2013
UCLA Health
2011
Goddard Space Flight Center
2008-2010
University of America
2009
Catholic University of America
2009
The Wide-field Infrared Survey Explorer (WISE) is an extremely capable and efficient black hole finder. We present a simple mid-infrared color criterion, W1 − W2 ⩾ 0.8 (i.e., [3.4]−[4.6] ⩾0.8, Vega), which identifies 61.9 ± 5.4 active galactic nucleus (AGN) candidates per deg2 to depth of ∼ 15.0. This implies much larger census luminous AGNs than found by typical wide-area surveys, attributable the fact that selection both unobscured (type 1) obscured 2) AGNs. Optical soft X-ray surveys...
We have carried out a survey of the north and south ecliptic poles, EP-N EP-S, respectively, with Spitzer Space Telescope Wide-field Infrared Survey Explorer (WISE). The primary objective was to cross-calibrate WISE Midcourse Experiment (MSX) photometric systems by developing set calibration stars that are common these infrared missions. poles were continuous viewing zones for due its polar-crossing orbit, making areas ideal both absolute internal calibrations. IRAC MIPS imaging covers...
We present ground-based spectroscopic verification of 6 Y dwarfs (see also Cushing et al.), 89 T dwarfs, 8 L and 1 M dwarf identified by the Wide-field Infrared Survey Explorer (WISE). Eighty these are cold brown with spectral types ⩾T6, six which have been announced earlier Mainzer al. Burgasser color–color color–type diagrams showing locus M, L, T, in WISE color space. Near-infrared and, a few cases, optical spectra presented for discoveries. classifications as late early objects peculiar...
The Wide-field Infrared Survey Explorer (WISE) mapped the entire sky at mid-infrared wavelengths 3.4, 4.6, 12 and 22 microns. mission was primarily designed to extract point sources, leaving resolved extended sources unexplored. We have begun a dedicated WISE Enhanced Resolution Galaxy Atlas (WERGA) project fully characterize large, nearby galaxies produce legacy image atlas source catalogue. Here we demonstrate first results of for sample 17 galaxies, chosen be large angular size, diverse...
Abstract Observations have found black holes spanning 10 orders of magnitude in mass across most cosmic history. The Kerr hole solution is, however, provisional as its behavior at infinity is incompatible with an expanding universe. Black models realistic predict that the gravitating a can increase expansion universe independently accretion or mergers, manner depends on hole’s interior solution. We test this prediction by considering growth supermassive elliptical galaxies over 0 < z ≲...
Numerical simulations of wave propagation in a two-dimensional stratified magneto-atmosphere are presented for conditions that representative the solar photosphere and chromosphere. Both emergent magnetic flux extent source spatially localized at lower photospheric boundary simulation. The calculations show coupling between fast slow magneto-acoustic-gravity (MAG) waves is confined to thin quasi-one-dimensional atmospheric layers where sound speed Alfvén velocity comparable magnitude. Away...
We report the discovery by Wide-field Infrared Survey Explorer of z = 2.452 source WISE J181417.29+341224.9, first hyperluminous found in survey. 1814+3412 is also prototype for an all-sky sample ~1000 extremely luminous "W1W2-dropouts" (sources faint or undetected at 3.4 and 4.6 microns well detected 12 22 microns). The data a 350 micron detection give minimum bolometric luminosity 3.7 x 10^13 Lsun, with ~10^14 Lsun plausible. Followup images reveal four nearby sources: QSO two Lyman Break...
We present 20 WISE-selected galaxies with bolometric luminosities L_bol > 10^14 L_sun, including five infrared L_IR = L(rest 8-1000 micron) L_sun. These "extremely luminous galaxies," or ELIRGs, were discovered using the "W1W2-dropout" selection criteria which requires marginal non-detections at 3.4 and 4.6 micron (W1 W2, respectively) but strong detections 12 22 in WISE survey. Their spectral energy distributions are dominated by emission rest-frame 4-10 micron, suggesting that hot dust T_d...
We present Herschel observations of 6 fine-structure lines in 25 ultraluminous infrared galaxies at z < 0.27. The lines, [O iii]52 μm, [N iii]57 i]63 ii]122 i]145 and [C ii]158 are mostly single Gaussians with widths <600 km s−1 luminosities 107–109 L☉. There deficits the i]63/LIR, ii]/LIR, i]145/LIR, ii]/LIR ratios compared to lower luminosity systems. majority line consistent dustier H ii regions, but part ii] deficit may arise from an additional mechanism, plausibly charged dust grains....
Abstract The assembly of stellar and supermassive black hole (SMBH) mass in elliptical galaxies since z ∼ 1 can help to diagnose the origins locally observed correlations between SMBH mass. We therefore construct three samples galaxies, one at 0 two 0.7 ≲ 2.5, quantify their relative positions M BH − * plane. Using a Bayesian analysis framework, we find evidence for translational offsets both local sample higher-redshift samples. are small, consistent with measurement bias, but much larger,...
We present optical to far-infrared photometry of 31 reddened QSOs that show evidence for radiatively driven outflows originating from active galactic nuclei (AGNs) in their rest-frame UV spectra. use these data study the relationships between AGN-driven outflows, and AGN starburst infrared luminosities. find FeLoBAL are invariably IR-luminous, with IR luminosities exceeding 1012 L☉ all cases. The supplies 76% total emission, on average, but a range 20% 100%. no absolute luminosity obscured...
We have used the Caltech Submillimeter Observatory (CSO) to follow-up a sample of WISE-selected, hyperluminous galaxies, so called W1W2-dropout galaxies. This is rare (~ 1000 all-sky) population galaxies at high redshift (peaks z=2-3), that are faint or undetected by WISE 3.4 and 4.6 um, yet clearly detected 12 22 um. The optical spectra most these show significant AGN activity. observed 14 high-redshift (z > 1.7) with SHARC-II 350 850 9 detections; 18 Bolocam 1.1 mm, five detections. Warm...
We report a new technique to select 1.6<z<4.6 dusty Lyman-alpha emitters (LAEs), over third of which are `blobs' (LABs) with emission extended on scales 30-100kpc. Combining data from the NASA Wide-field Infrared Survey Explorer (WISE) mission optical spectroscopy W.M. Keck telescope, we present color criteria that yields 78% success rate in identifying rare, LAEs at least 37% LABs. The objects have surface density only ~0.1 per square degree, making them rare enough they been largely missed...
We investigate the range of covering factors (determined from ratio IR to UV/optical luminosity) seen in luminous type 1 quasars using a combination data WISE, UKIDSS and SDSS surveys. Accretion disk (UV/optical) obscuring dust (IR) luminosities are measured via use simple three component SED model. these estimates distribution its relationship both accretion luminosity shape. The (f_C) is observed be log-normal, with bias-corrected mean <log10 f_C>=-0.41 standard deviation 0.2. fraction...
We present SCUBA-2 850um submillimetre (submm) observations of the fields 10 dusty, luminous galaxies at z ~ 1.7 - 4.6, detected 12um and/or 22um by WISE all-sky survey, but faint or undetected 3.4um and 4.6um; dubbed hot, dust-obscured (Hot DOGs). The six targets all have total infrared luminosities greater than 10^13 L_sun, with one 10^14 L_sun. Their spectral energy distributions (SEDs) are very blue from mid-infrared to submm wavelengths not well fitted standard AGN SED templates,...
We investigate the relation between star formation rates (|$\dot{{M}}_s$|) and AGN properties in optically selected type 1 quasars at 2 < z 3 using data from Herschel SDSS. find that |$\dot{{M}}_s$| remains approximately constant with redshift, 300 ± 100 M⊙ yr−1. Conversely, increases luminosity, up to a maximum of ∼ 600 yr−1, C iv FWHM. In context previous results, this is consistent black hole accretion rate (|$\dot{{M}}_{{\rm bh}}$|) existing only parts...
We study stellar and black hole mass assembly in a sample of 42 infrared-luminous galaxy mergers at z<0.3 by combining results from radiative transfer modelling with archival measures molecular gas mass. The ratios mass, to each other are consistent those massive gas-rich galaxies z<0.3. advanced may show increased ratios, the transition AGN ellipticals implying substantial growth over course merger. Star formation rates enhanced relative local main sequence, factors ~100 starburst ~1.8...
We examine the origin of molecular gas heating in a sample 42 infrared-luminous galaxies at $z<0.3$ by combining two sets archival data. First, integrated CO line luminosities 1-0 and 5-4 through 13-12 transitions. Second, results from radiative transfer modelling that decompose their bolometric emission into starburst, AGN, host galaxy components. find 9-8 lines primarily arise via starburst galaxy. In contrast, 10-9 may with an increasing contribution mechanical shocks. For as whole, we no...
The assembly of supermassive black hole (SMBH) mass ($M_{\bullet}$) and stellar ($M_{*}$) in galaxies can be studied via the redshift evolution $M_{\bullet}-M_{*}$ relation, but ways which selection bias physical channels affect this are uncertain. To address this, we compare relation for local massive ($M_{*}>10^{10.5}$M$_{\odot}$) quiescent early-type (ETGs) to that ETGs hosting active galactic nuclei (AGN) at $z\sim0.8$. restrictions on galaxy type limit may connect two relations. For...
Abstract The assembly of supermassive black hole (SMBH) mass ( M • ) and stellar * in galaxies can be studied via the redshift evolution – relation, but ways which selection bias physical channels affect this are uncertain. To address this, we compare relation for local massive > 10 10.5 ⊙ quiescent early-type (ETGs) to that ETGs hosting active galactic nuclei (AGN) at z ∼ 0.8. restrictions on galaxy type limit may connect two relations. For sample find <mml:math...
After eight months of continuous observations, the Wide-field Infrared Survey Explorer (WISE) mapped entire sky at 3.4 μm, 4.6 12 and 22 μm. We have begun a dedicated WISE High Resolution Galaxy Atlas project to fully characterize large, nearby galaxies produce legacy image atlas source catalog. Here we summarize deconvolution techniques used significantly improve spatial resolution imaging, specifically designed study internal anatomy galaxies. As case study, present results for galaxy NGC...
Very sensitive HI 21cm observations have been made in 860 directions at dec >= -43deg search of weak, Galactic, high-velocity emission lines moderate and high Galactic latitudes. One-third the were toward extragalactic objects. The median 4-sigma detection level is NHI = 8x10^{17} cm^-2 over 21' telescope beam. High-velocity detected 37% directions; about half could not seen previous surveys. FWHM 30.3 km/s. High- velocity are down to sensitivity limit survey implying that there likely...
Abstract We present Hubble Space Telescope WFC3 F160W imaging and infrared spectral energy distributions for 12 extremely luminous, obscured active galactic nuclei (AGNs) at 1.8 < z 2.7 selected via “hot, dust-obscured” mid-infrared colors. Their luminosities span (2–15) × 10 13 L ⊙ , making them among the most luminous objects in universe ∼ 2. In all cases, emission is consistent with arising least part from AGN activity. The fractional are higher than those either submillimeter galaxies...
We report on the results of an optical spectroscopic survey at high Galactic latitude (b\geq30{\deg}) a sample WISE-selected targets, grouped by WISE W1 ({\lambda}_eff = 3.4 \mum) flux, which we use to characterize sources detected. observed 762 targets in 10 disjoint fields centered ultra-luminous infrared galaxy (ULIRG) candidates using DEIMOS spectrograph Keck II. find 0.30 \pm 0.02 galaxies arcmin^-2 with median redshift z=0.33 0.01 for \geq 120 \muJy. The foreground stellar densities...