Publications (21)
Multi-Wavelength Study of Sgr A*: The Short Time Scale Variability
F. Yusef-Zadeh, J. Miller-Jones, D. Roberts +5
To understand the correlation and the radiation mechanism of flare emission in different wavelength bands, we have coordinated a number of telescopes to observe SgrA* simultaneousl…
A Multi-Wavelength Study of Sgr A*: The Role of Near-IR Flares in Production of X-ray, Soft -ray and Sub-millimeter Emission
F. Yusef-Zadeh, H. Bushouse, C. D. Dowell +8
(abridged) We describe highlights of the results of two observing campaigns in 2004 to investigate the correlation of flare activity in Sgr A* in different wavelength regimes, usin…
Radio Continuum Emission from the Magnetar SGR J1745-2900: Interaction with Gas Orbiting Sgr A*
F. Yusef-Zadeh, R. Diesing, M. Wardle +5
We present radio continuum light curves of the magnetar SGR J17452900 and Sgr A* obtained with multi-frequency, multi-epoch Very Large Array observations between 2012 and 2014.…
Massive Star Formation in the Molecular Ring Orbiting the Black Hole at the Galactic Center
F. Yusef-Zadeh, J. Braatz, M. Wardle +1
A ring of dense molecular gas extending 2-7 pc orbits the supermassive black hole Sgr A* at the center of our Galaxy. Using the Green Bank Telescope, we detected water maser lines…
The Metagalactic Ionizing Radiation Field at Low Redshift
J. M. Shull, D. Roberts, M. L. Giroux +2
We compute the ionizing radiation field at low redshift, arising from Seyferts, QSOs, and starburst galaxies. This calculation combines recent Seyfert luminosity functions, extrapo…
Euclid Quick Data Release (Q1). Quenching precedes bulge formation in dense environments but follows it in the field
Euclid Collaboration, F. Gentile, E. Daddi +321
(Abridged) The bimodality between star-forming discs and quiescent spheroids requires the existence of two main processes: the galaxy quenching and the morphological transformation…
Interacting Cosmic Rays with Molecular Clouds: A Bremsstrahlung Origin of Diffuse High Energy Emission from the Inner 2deg by 1deg of the Galactic Center
F. Yusef-Zadeh, J. W. Hewitt, M. Wardle +8
The high energy activity in the inner few degrees of the Galactic center is traced by diffuse radio, X-ray and gamma-ray emission. The physical relationship between different compo…
SuperB Technical Design Report
SuperB Collaboration, M. Baszczyk, P. Dorosz +406
In this Technical Design Report (TDR) we describe the SuperB detector that was to be installed on the SuperB e+e- high luminosity collider. The SuperB asymmetric collider, which wa…
Simultaneous Chandra, CSO and VLA Observations of Sgr A*: The Nature of Flaring Activity
F. Yusef-Zadeh, M. Wardle, C. Heinke +4
Sgr A*, the massive black hole at the center of the Galaxy, varies in radio through X-ray emission on hourly time scales. The flare activity is thought to arise from the innermost…
Alternative PV Bus Modelling with the Holomorphic Embedding Load Flow Method
I. Wallace, D. Roberts, A. Grothey +1
The Holomorphic Embedding Load Flow Method (HELM) has been suggested as an alternative approach to solve load flow problems. However, the current literature does not provide any HE…
Euclid: Disky titans -- surprisingly high star formation efficiency in two brightest group galaxies at
F. Gentile, E. Daddi, D. Elbaz +165
We present the discovery of two disky titans in the first data release of the Euclid satellite. These sources are massive () star-forming (SFR /…
Euclid Quick Data Release (Q1). Extending the quest for little red dots to z<4
Euclid Collaboration, L. Bisigello, G. Rodighiero +348
Recent James Webb Space Telescope (JWST) observations have revealed a population of sources with a compact morphology and a characteristic `v-shaped' continuum, namely blue at rest…
Local Alignment of the BABAR Silicon Vertex Tracking Detector
D. N. Brown, A. V. Gritsan, Z. J. Guo +1
The BABAR Silicon Vertex Tracker (SVT) is a five-layer double-sided silicon detector designed to provide precise measurements of the position and direction of primary tracks, and t…
Flaring Activity of Sgr A* at 43 and 22 GHz: Evidence for Expanding Hot Plasma
F. Yusef-Zadeh, D. Roberts, M. Wardle +2
We have carried out Very Large Array (VLA) continuum observations to study the variability of Sgr A* at 43 GHz (=7mm) and 22 GHz (=13mm). A low level of flare activity has…
AGILE: an end-to-end Rubin-LSST simulation of AGNs, galaxies, and stars I. Software description and first data release
A. Viitanen, A. Bongiorno, I. Saccheo +37
Contemporary large-scale surveys such as the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) and Euclid present an unprecedented discovery potential for studying A…
Environmental Quenching of Low Surface Brightness Galaxies near Milky Way mass Hosts
J. Bhattacharyya, A. H. G. Peter, P. Martini +48
Low Surface Brightness Galaxies (LSBGs) are excellent probes of quenching and other environmental processes near massive galaxies. We study an extensive sample of LSBGs near massiv…
Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye
Åukasz Wyrzykowski, P. Mróz, K. A. Rybicki +182
Gaia16aye was a binary microlensing event discovered in the direction towards the northern Galactic disc and was one of the first microlensing events detected and alerted to by the…
Rapid Intrinsic Variability of Sgr A* at Radio Wavelengths
F. Yusef-Zadeh, M. Wardle, J. Miller-Jones +3
Sgr A* exhibits flares in radio, millimeter and submm wavelengths with durations of hour. Using structure function, power spectrum and autocorrelation function analysis, w…
Euclid Quick Data Release (Q1): The evolution of the passive-density and morphology-density relations between and
Euclid Collaboration, C. Cleland, S. Mei +320
The extent to which the environment affects galaxy evolution has been under scrutiny by researchers for decades. With the first data from Euclid, we can begin to systematically stu…
Early growth of massive black holes in dynamical dark energy models with negative cosmological constant
N. Menci, M. Castellano, P. Mukherjee +4
Recent results from combined cosmological probes indicate that the Dark Energy component of the Universe could be dynamical. The simplest explanation envisages the presence of a qu…
Anisotropy in the Angular Broadening of Sgr A at the Galactic Center
F. Yusef-Zadeh W. Cotton M. Wardle F. Melia, D. Roberts
We present the results of a 20 cm VLA observation of the compact Galactic center radio source Sgr A. The scatter-broadened image is elongated in the East-West direction, wi…