Results 21 to 30 of about 352 (180)
NGC 5084: A Massive Disk Galaxy Accreting its Satellites?
The Astronomical Journal, 1997 The spectra of 34 galaxies within 20 arcmins (\sim 100 kpc) of the lenticular galaxy NGC 5084 have been obtained using the FOCAP system on the Anglo-Australian 3.9m telescope. Nine objects are found with projected separations \lesssim 80 kpc and with radial velocities within \pm 630 km/s of the parent galaxy redshift.
Carignan, Claude +3 more
openaire +2 more sources
An accretion disk laboratory in the Seyfert 1.9 galaxy NGC 2992 [PDF]
Proceedings of the International Astronomical Union, 2006 AbstractOver twenty five years of X-ray observations of the Seyfert 1.9 galaxy NGC 2992 show that it is a promising test-bed for severely constraining accretion disk models. The previous interpretation of the historical activity of NGC 2992 in terms of the accretion disk slowly becoming dormant over many years and then ‘re-building’ itself is not ...
Tahir Yaqoob +2 more
openaire +1 more source
Gas accretion from the cosmic web feeding disk galaxies [PDF]
Proceedings of the International Astronomical Union, 2016 AbstractDisk galaxies in cosmological numerical simulations grow by accreting gas from the cosmic web. This gas reaches the external disk, and then spirals in dragged along by tidal forces and/or disk instabilities. The importance of gas infall is as clear from numerical simulations as it is obscure to observations.
J. Sánchez Almeida +7 more
openaire +1 more source
Accretion-driven turbulence as universal process: galaxies, molecular clouds, and protostellar disks [PDF]
Astronomy and Astrophysics, 2010 accepted version, 22 pages, 10 figures, Astronomy and Astrophysics in ...
Klessen, Ralf S., Hennebelle, Patrick
openaire +3 more sources
On Estimating the Mass of Keplerian Accretion Disks in H2O Maser Galaxies [PDF]
The Astrophysical Journal, 2018 Abstract H2O maser disks with Keplerian rotation in active galactic nuclei offer a clean way to determine accurate black hole mass and the Hubble constant. An important assumption made in using a Keplerian H2O maser disk for measuring black hole mass and the Hubble constant is that the disk mass is negligible compared to the black hole ...
C. Y. Kuo +5 more
openaire +2 more sources
The Great Cosmic Silence: What Does the Fermi Paradox Tell About the Future of Humanity?
Global Policy, EarlyView.ABSTRACT This article examines how institutional time horizons shape the long‐term survival prospects of human technological civilisation. While research on global catastrophic and existential risks has expanded, the temporal structures of political‐economic institutions remain underexamined.
Heikki Patomäki
wiley +1 more source
Properties of Galaxies with Counter-rotating Stellar Disks in the MaNGA Survey
The Astrophysical JournalThe gas accretion process can fuel both star formation and black hole activity, playing a critical role in galaxy evolution. The counter-rotating structures are believed to originate from gas accretion, serving as an ideal laboratory to study its impact ...
Min Bao +4 more
doaj +1 more source
Spaceborne and spaceborn: Physiological aspects of pregnancy and birth during interplanetary flight
Experimental Physiology, EarlyView.Abstract Crewed interplanetary return missions that are on the planning horizon will take years, more than enough time for initiation and completion of a pregnancy. Pregnancy is viewed as a sequence of processes – fertilization, blastocyst formation, implantation, gastrulation, placentation, organogenesis, gross morphogenesis, birth and neonatal ...
Arun V. Holden
wiley +1 more source
Evidence of an Untruncated Accretion Disk in the Broad-Line Radio Galaxy 4C 74.26 [PDF]
The Astrophysical Journal, 2005 4 pages, 2 figures, accepted by ApJ ...
Ballantyne, D. R., Fabian, A. C.
openaire +2 more sources
The Astrophysical JournalWe propose an alternative physical interpretation and formation pathway for the recently discovered “little red dots” (LRDs). We model LRDs as supermassive stars (SMSs) surrounded by massive self-gravitating accretion disks (supermassive disks, SMDs ...
Lorenz Zwick +2 more
doaj +1 more source