Search Publications
The Paschen Jump as a Diagnostic of the Diffuse Nebular Continuum Emission in Active Galactic Nuclei
Ho, Luis C.; Brandt, William N.; Barth, Aaron J. +17 more
Photoionization modeling of active galactic nuclei (AGN) predicts that diffuse continuum (DC) emission from the broad-line region makes a substantial contribution to the total continuum emission from ultraviolet through near-infrared wavelengths. Evidence for this DC component is present in the strong Balmer jump feature in AGN spectra, and possib…
A Submillimeter Survey of Faint Galaxies behind 10 Strong Lensing Clusters
Bauer, F. E.; Barger, A. J.; Cowie, L. L. +5 more
We present deep SCUBA-2 450 µm and 850 µm imaging of 10 strong lensing clusters. We provide a >4σ SCUBA-2 850 µm catalog of the 404 sources lying within a radius of $4\buildrel{\,\prime}\over{.} 5$ from the cluster centers. We also provide catalogs of the >4.5σ Atacama Large Millimeter/submillimeter Array (ALMA) 850 µ…
Viewing Angle Observations and Effects of Evolution with Redshift, Black Hole Mass, and Eddington Ratio in Quasar-based Cosmology
Pollo, Agnieszka; Czerny, Bożena; Prince, Raj +2 more
This study is focused on the observational measurement of the viewing angle of individual quasars by modeling the broadband quasar spectrum ranging from the IR to soft X-ray band. Sources are selected from various published catalogs, and their broadband quasi-simultaneous spectral data points were collected and used for modeling. We started with a…
Study of X-Ray Intraday Variability of HBL Blazars Based on Observations Obtained with XMM-Newton
Gupta, Alok C.; Wiita, Paul J.; Jithesh, V. +1 more
We present an extensive study on the X-ray intraday variability of 10 teraelectronvolt-emitting high synchrotron peaked blazars (HBLs): 1ES 0229+200, 1ES 0414+009, PKS 0548-322, 1ES 1101-232, 1H 1219+301, H 1426+428, Mrk 501, 1ES 1959+650, PKS 2005-489, and 1ES 2344+514 made with 25 XMM-Newton pointed observations during its operational period. In…
An 8.56 keV Absorption Line in the Hyperluminous X-Ray Source in NGC 4045: Ultrafast Outflow or Cyclotron Line?
Fürst, Felix; Middleton, Matthew J.; Walton, Dominic J. +5 more
We report on the discovery of an absorption line at $E={8.56}_{-0.11}^{+0.05}$ keV detected with a significance of >3.3σ in the NuSTAR and XMM-Newton spectra of a newly discovered hyperluminous X-ray source (L X > 1041 erg s-1) in the galaxy NGC 4045 at a distance of 32 Mpc. The source was first discovered se…
The Solar Internetwork. III. Unipolar versus Bipolar Flux Appearance
Cheung, M. C. M.; Gošić, M.; Bellot Rubio, L. R. +3 more
Small-scale internetwork (IN) magnetic fields are considered to be the main building blocks of quiet Sun magnetism. For this reason, it is crucial to understand how they appear on the solar surface. Here, we employ a high-resolution, high-sensitivity, long-duration Hinode/NFI magnetogram sequence to analyze the appearance modes and spatiotemporal …
Resolved Stellar Mass Maps of Galaxies in the Hubble Frontier Fields: Evidence for Mass Dependency in Environmental Quenching
Matharu, Jasleen; Muzzin, Adam; van der Wel, Arjen +9 more
One of the challenges in understanding the quenching processes for galaxies is connecting progenitor star-forming populations to their descendant quiescent populations over cosmic time. Here we attempt a novel approach to this challenge by assuming that the underlying stellar mass distribution of galaxies is not significantly altered during enviro…
IM Normae: The Death Spiral of a Cataclysmic Variable?
Myers, Gordon; Monard, Berto; Dvorak, Shawn +18 more
We present a study of the orbital light curves of the recurrent nova IM Normae since its 2002 outburst. The broad "eclipses" recur with a 2.46 hr period, which increases on a timescale of 1.28(16) × 106 yr. Under the assumption of conservative mass transfer, this suggests a rate near 10-7 M ⊙ yr-1, and t…
SRGA J181414.6-225604: A New Galactic Symbiotic X-Ray Binary Outburst Triggered by an Intense Mass-loss Episode of a Heavily Obscured Mira Variable
Soria, Roberto; Boyer, Martha L.; Conroy, Charlie +24 more
We present the discovery and multiwavelength characterization of SRGA J181414.6-225604, a Galactic hard X-ray transient discovered during the ongoing SRG/ART-XC sky survey. Using data from the Palomar Gattini-IR survey, we identify a spatially and temporally coincident variable infrared (IR) source, IRAS 18111-2257, and classify it as a very-late-…
A 16 hr Transit of Kepler-167 e Observed by the Ground-based Unistellar Telescope Network
Esposito, Thomas M.; Wagner, Kevin; Dalba, Paul A. +35 more
More than 5000 exoplanets have been confirmed and among them almost 4000 were discovered by the transit method. However, few transiting exoplanets have an orbital period greater than 100 days. Here we report a transit detection of Kepler-167 e, a "Jupiter analog" exoplanet orbiting a K4 star with a period of 1071 days, using the Unistellar ground-…