Results 61 to 70 of about 21,097,663 (248)
ALMA Observations of the Terahertz Spectrum of Sagittarius A* [PDF]
Astrophysical Journal, 2019 We present Atacama Large Millimeter/submillimeter Array (ALMA) observations at 233, 678, and 870 GHz of the Galactic Center black hole, Sagittarius A*.
G. Bower +13 more
semanticscholar +1 more source
Spin‐induced Disk Precession in Sagittarius A* [PDF]
The Astrophysical Journal, 2005 In Sgr A* at the Galactic center, by far the closest and easiest supermassive black hole we can study, the observational evidence is increasingly pointing to the presence of a compact, hot, magnetized disk feeding the accretor. In such low-Mach-number plasmas, forces arising, e.g., from pressure gradients in the plasma, can altogether negate the ...
Rockefeller, Gabriel +2 more
openaire +2 more sources
Sagittarius-A and the Philosophical Black Hole: What Lies at the Center?
Turkish Academic Research ReviewWhether considered from a theological perspective or through the lens of classical physics, human beings have historically been placed at the center of the universe. Other living beings are deemed significant insofar as they contribute to the survival of
Ömer Fatih Tekin
doaj +1 more source
Simultaneous X-Ray and Infrared Observations of Sagittarius A*'s Variability [PDF]
Astrophysical Journal, 2018 Emission from Sagittarius A* is highly variable at both X-ray and infrared (IR) wavelengths. Observations over the last ∼20 yr have revealed X-ray flares that rise above a quiescent thermal background about once per day, while faint X-ray flares from Sgr
H. Boyce +15 more
semanticscholar +1 more source
The extreme luminosity states of Sagittarius A* [PDF]
Astronomy and Astrophysics, 2010 We discuss mm-wavelength radio, 2.2-11.8um NIR and 2-10 keV X-ray light curves of the super massive black hole (SMBH) counterpart of Sagittarius A* (SgrA*) near its lowest and highest observed luminosity states. The luminosity during the low state can be interpreted as synchrotron emission from a continuous or even spotted accretion disk.
Sabha, N. +12 more
openaire +2 more sources
The Astrophysical JournalWe develop a new method for studying the Galactic magnetic field along the spiral arms using pulsar Faraday rotation measures (RMs). Our new technique accounts for the dot-product nature of Faraday rotation and also splits the associated path integral ...
Alice P. Curtin +2 more
doaj +1 more source
Repeated X‐Ray Flaring Activity in Sagittarius A* [PDF]
The Astrophysical Journal, 2005 Investigating the spectral and temporal characteristics of the X-rays coming from Sagittarius A* (Sgr A*) is essential to our development of a more complete understanding of the emission mechanisms in this supermassive black hole located at the center of our Galaxy.
Bélanger, G. +7 more
openaire +6 more sources
On the Structure of the Sagittarius Spiral Arm in the Inner Milky Way
The Astronomical JournalWe report measurements of trigonometric parallax and proper motion for two 6.7 GHz methanol and two 22 GHz water masers located in the far portion of the Sagittarius spiral arm as part of the BeSSeL Survey.
S. B. Bian +8 more
doaj +1 more source
GALACTIC CENTER MINISPIRAL: INTERACTION MODES OF NEUTRON STARS
Acta Polytechnica, 2015 Streams of gas and dust in the inner parsec of the Galactic center form a distinct feature known as the Minispiral, which has been studied in radio waveband as well as in the infrared wavebands.
Michal Zajacek +2 more
doaj +1 more source
A Dynamically Distinct Stellar Population in the Leading Arm of the Sagittarius Stream
The Astrophysical Journal Letters, 2023 We present a chemical and dynamical analysis of the leading arm (LA) and trailing arm (TA) of the Sagittarius (Sgr) stream, as well as for the Sgr dwarf galaxy core (SC), using red giant branch, main-sequence, and RR Lyrae stars from large spectroscopic ...
Gwibong Kang +3 more
doaj +1 more source