Results 61 to 70 of about 35,587 (387)
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
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.
Devaky Kunneriath +16 more
openaire +3 more sources
Testing the ALP-photon coupling with polarization measurements of Sagittarius A⋆ [PDF]
Journal of Cosmology and Astroparticle Physics, 2020 Ultra-light bosons such as axions or axion-like particles (ALPs), are promising candidates to solve the dark matter problem. A unique way to detect such ALPs is to search for the periodic oscillation feature of the position angles of linearly polarized ...
G. Yuan +7 more
semanticscholar +1 more source
The Parallax and 3D Kinematics of Water Masers in the Massive Star-forming Region G034.43+0.24
The Astrophysical Journal, 2023 We report a measurement of the trigonometric parallax of 22 GHz water masers in the massive star-forming region G034.43+0.24 as part of the Bar and Spiral Structure Legacy Survey using the Very Long Baseline Array.
Xiaofeng Mai +14 more
doaj +1 more source
, 2018 Published as part of Bhattarai, Santosh, Pokheral, Chiranjibi Prasad, Lamichhane, Babu Ram, Regmi, Uba Raj, Ram, Ashok Kumar & Subedi, Naresh, 2018, Amphibians and reptiles of Parsa National Park, Nepal, pp.
Bhattarai, Santosh +5 more
openaire +2 more sources
M54 + SAGITTARIUS = ω CENTAURI [PDF]
The Astrophysical Journal, 2010 We derive homogeneous abundances of Fe, O, Na and alpha-elements from high resolution FLAMES spectra for 76 red giant stars in NGC 6715 (M 54) and for 25 red giants in the surrounding nucleus of the Sagittarius (Sgr) dwarf galaxy. Our main findings are that: (i) we confirm that M 54 shows intrinsic metallicity dispersion, ~0.19 dex r.m.s.; (ii) when ...
Elisa Carretta +11 more
openaire +3 more sources
The Size, Shape, and Scattering of Sagittarius A* at 86 GHz: First VLBI with ALMA [PDF]
Astrophysical Journal, 2019 The Galactic center supermassive black hole Sagittarius A* (Sgr A*) is one of the most promising targets to study the dynamics of black hole accretion and outflow via direct imaging with very long baseline interferometry (VLBI).
S. Issaoun +51 more
semanticscholar +1 more source
An all-sky proper-motion map of the Sagittarius stream using Gaia DR2 [PDF]
Astronomy & Astrophysics, 2020 Aims. We aim to measure the proper motion along the Sagittarius stream, which is the missing piece in determining its full 6D phase space coordinates. Methods. We conduct a blind search of over-densities in proper motion from the Gaia second data release
T. Antoja +6 more
semanticscholar +1 more source
Sagittarius A* in the Infrared [PDF]
Journal of Physics: Conference Series, 2012 The central black hole of the Milky Way, Sagittarius A* (SgrA*) is, in terms of Eddington luminosity, the weakest accreting object of its class accessible to detailed observations. It is therefore key to the refinement of theoretical models of radiatively inefficient accretion.
openaire +1 more source
A Panoramic Landscape of the Sagittarius Stream in Gaia DR2 Revealed with the STREAMFINDER Spyglass [PDF]
Astrophysical Journal, 2020 We present the first full six-dimensional panoramic portrait of the Sagittarius stream, obtained by searching for wide stellar streams in the Gaia DR2 data set with the STREAMFINDER algorithm.
R. Ibata +6 more
semanticscholar +1 more source