Justin Ely
A5091303690- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Calibration and Measurement Techniques
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Atmospheric and Environmental Gas Dynamics
- Adaptive optics and wavefront sensing
- Atmospheric Ozone and Climate
- Dark Matter and Cosmic Phenomena
- Photocathodes and Microchannel Plates
- Astro and Planetary Science
- CCD and CMOS Imaging Sensors
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Spectroscopy and Laser Applications
- Solar and Space Plasma Dynamics
- Radio Astronomy Observations and Technology
- Geomagnetism and Paleomagnetism Studies
- Laser Design and Applications
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Advancements in Photolithography Techniques
- Advanced Optical Sensing Technologies
University of Cambridge
2024
Space Telescope Science Institute
2012-2021
Brown University
2021
Eureka Scientific
2017-2018
University of Salford
1989
We present the first public version (v0.2) of open-source and community-developed Python package, Astropy. This package provides core astronomy-related functionality to community, including support for domain-specific file formats such as Flexible Image Transport System (FITS) files, Virtual Observatory (VO) tables, common ASCII table formats, unit physical quantity conversions, constants specific astronomy, celestial coordinate time transformations, world system (WCS) support, generalized...
Supermassive black holes in the nuclei of active galaxies expel large amounts matter through powerful winds ionized gas. The archetypal galaxy NGC 5548 has been studied for decades, and high-resolution X-ray UV observations have previously shown a persistent outflow. An observing campaign 2013 with six space observatories shows nucleus to be obscured by long-lasting, clumpy stream gas never seen before. It blocks 90% soft emission causes simultaneous deep, broad absorption troughs. outflow...
Recent intensive Swift monitoring of the Seyfert 1 galaxy NGC 5548 yielded 282 usable epochs over 125 days across six UV/optical bands and X-rays. This is densest extended AGN continuum sampling ever obtained, with a mean rate <0.5 day. Approximately daily HST UV was also obtained. The light curves show strong correlations (r_max = 0.57 - 0.90) clearest measurement to date interband lags. These lags are well-fit by \tau propto \lambda^4/3 wavelength dependence, normalization that indicates...
ABSTRACT We present ground-based optical photometric monitoring data for NGC 5548, part of an extended multiwavelength reverberation mapping campaign. The light curves have nearly daily cadence from 2014 January to July in nine filters ( BVRI and ugriz ). Combined with ultraviolet the Hubble Space Telescope Swift , we confirm significant time delays between continuum bands as a function wavelength, extending wavelength coverage 1158 Å z band (~9160 Å). find that lags at wavelengths longer...
We describe the first results from a six-month long reverberation-mapping experiment in ultraviolet based on 170 observations of Seyfert 1 galaxy NGC 5548 with Cosmic Origins Spectrograph Hubble Space Telescope. Significant correlated variability is found continuum and broad emission lines, amplitudes ranging ~30% to factor two lines three continuum. The variations all strong lag behind those continuum, He II 1640 lagging by ~2.5 days Lyman alpha 1215, C IV 1550, Si 1400 ~5-6 days....
Dynamic interactions between the two Magellanic Clouds have flung large quantities of gas into halo Milky Way. The result is a spectacular arrangement gaseous structures, including Stream, Bridge, and Leading Arm (collectively referred to as System). In this third paper series studying in absorption, we analyze ionization level using sample 69 Hubble Space Telescope/Cosmic Origins Spectrograph sightlines that pass through or within 30° 21 cm emitting regions. We find 81% (56/69) show UV...
(Abridged) Our deep multiwavelength campaign on NGC 5548 revealed an unusually strong X-ray obscuration. The resulting dramatic decrease in incident ionizing flux allowed us to construct a comprehensive physical, spatial and temporal picture for the long-studied AGN wind this object. Here we analyze UV spectra of outflow acquired during as well from four previous epochs. We find that simple model based fixed total column-density absorber, reacting changes illumination, matches very different...
We present the discovery of an outflowing ionized wind in Seyfert 1 Galaxy Mrk 335. Despite having been extensively observed by most largest X-ray observatories last decade, this bright source was not known to host warm absorber gas until recent XMM-Newton observations combination with a long-term Swift monitoring program have shown extreme flux and spectral variability. High resolution spectra obtained RGS detector reveal that consists three distinct ionization components, all at velocity...
We present the results of an optical spectroscopic monitoring program targeting NGC 5548 as part a larger multi-wavelength reverberation mapping campaign. The campaign spanned six months and achieved almost daily cadence with observations from five ground-based telescopes. H$\beta$ He II $\lambda$4686 broad emission-line light curves lag that 5100 $\AA$ continuum by $4.17^{+0.36}_{-0.36}$ days $0.79^{+0.35}_{-0.34}$ days, respectively. relative to 1158 ultraviolet curve measured Hubble Space...
White dwarf WD 1145+017 is orbited by several clouds of dust, possibly emanating from actively disintegrating bodies. These dust reveal themselves through deep, broad, and evolving transits in the star's light curve. Here, we report two epochs multi-wavelength photometric observations 1145+017, including filters optical, K$_\mathrm{s}$ 4.5 $\mu$m bands 2016 2017. The observed transit depths are different at these wavelengths. However, after correcting for excess emission $\mu$m, find white...
ABSTRACT During an intensive Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS) UV monitoring campaign of the Seyfert 1 galaxy NGC 5548 performed from 2014 February to July, normally highly correlated far continuum and broad emission line variations decorrelated for ∼60–70 days, starting ∼75 days after first HST /COS observation. Following this anomalous state, flux variability lines returned a more normal state. This transient behavior, characterized by significant deficits in...
Aims. We observed the Seyfert 1 galaxy NGC 985 on several occasions to search for variability in its UV and X-ray absorption features establish their location physical properties.
We conduct a multiwavelength continuum variability study of the Seyfert 1 galaxy NGC 5548 to investigate temperature structure its accretion disk. The 19 overlapping light curves (1158 9157 angstroms) combine simultaneous HST , Swift and ground-based observations over 180 day period from 2014 January July. Light-curve is interpreted as reverberation response disk irradiation by central time-varying point source. Our model yields inclination, i, T1 at black hole, temperature-radius slope,...
We model the ultraviolet spectra of Seyfert 1 galaxy NGC~5548 obtained with Hubble Space Telescope during 6-month reverberation-mapping campaign in 2014. Our emission from NGC 5548 corrects for overlying absorption and deblends individual lines. Using modeled spectra, we measure response to continuum variations deblended absorption-corrected broad lines, velocity-dependent profiles Ly$\alpha$ C IV, narrow intrinsic features. find that time lags corrected lines are comparable those original...
During the Space Telescope and Optical Reverberation Mapping Project (STORM) observations of NGC 5548, continuum emission-line variability became de-correlated during second half 6-month long observing campaign. Here we present Swift Chandra X-ray spectra 5548 obtained as a part The show that excess flux (relative to power-law continuum) in soft band appears before start anomalous behavior, peaks period anomaly, then declines. This is model-independent result suggesting related anomaly. We...
We present geometric and dynamical modeling of the broad line region for multi-wavelength reverberation mapping campaign focused on NGC 5548 in 2014. The dataset includes photometric spectroscopic monitoring optical ultraviolet, covering H$\beta$, C IV, Ly$\alpha$ emission lines. find an extended disk-like H$\beta$ BLR with a mixture near-circular outflowing gas trajectories, while IV BLRs are much less resemble shell-like structures. There is clear radial structure BLR, arising at smaller...
Interferometric experiments designed to detect the highly redshifted 21-cm signal from neutral hydrogen are producing increasingly stringent constraints on power spectrum, but some k-modes remain systematics-dominated. Mutual coupling is a major systematic that must be overcome in order signal, and simulations reproduce effects seen data can guide strategies for mitigating mutual coupling. In this paper, we analyse 12 nights of Hydrogen Epoch Reionization Array compare against include...
The 21 cm transition from neutral Hydrogen promises to be the best observational probe of Epoch Reionisation (EoR). This has led construction low-frequency radio interferometric arrays, such as Reionization Array (HERA), aimed at systematically mapping this emission for first time. Precision calibration, however, is a requirement in observations. Due spatial compactness HERA, array prone effects mutual coupling, which inevitably lead non-smooth calibration errors that contaminate data. When...
Context. Radio-loud AGNs with powerful relativistic jets are thought to be associated rapidly spinning black holes (BHs). BH spin-up may result from a number of processes, including accretion matter onto the itself, and catastrophic events such as BH-BH mergers. Aims. We study intriguing properties (L_bol ~ 10^47 erg s^-1) radio-loud quasar 3C 186. This object shows peculiar features both in images spectra. Methods. utilize near-IR Hubble Space Telescope (HST) host galaxy, HST UV Sloan...
Abstract In this contribution, we achieve the primary goal of active galactic nucleus (AGN) STORM campaign by recovering velocity–delay maps for prominent broad emission lines (Ly α , C iv He ii and H β ) in spectrum NGC 5548. These are most detailed ever obtained an AGN, providing unprecedented information on geometry, ionization structure, kinematics broad-line region. Virial envelopes enclosing emission-line responses show that reverberating gas is bound to black hole. A stratified...
ABSTRACT The search for transiting habitable exoplanets has broadened to include several types of stars that are smaller than the Sun in an attempt increase observed transit depth and hence atmospheric signal planet. Of all spectral types, white dwarfs (WDs) most favorable this type investigation. fraction WDs possess close-in rocky planets is unknown, but large angle stellar surveys have photometric precision cadence discover at least one if they common. Ultraviolet observations may allow...
As current- and next-generation astronomical instruments come online, they will generate an unprecedented deluge of data. Analyzing these data in real time presents unique conceptual computational challenges, their long-term storage archiving is scientifically essential for generating reliable, reproducible results. We present here the real-time processing (RTP) system Hydrogen Epoch Reionization Array (HERA), a radio interferometer endeavoring to provide first detection highly redshifted 21...
Context. AGN outflows are thought to influence the evolution of their host galaxies and super massive black holes. To better understand these outflows, we executed a deep multiwavelength campaign on NGC 7469. The resulting data, combined with those earlier epochs, allowed us construct comprehensive physical, spatial, temporal picture for this wind. Aims. Our aim is determine distance UV outflow components from central source, abundances total column-density, mechanism responsible observed...