Results 31 to 40 of about 165,947,395 (159)

Astrophysical black holes: An explanation for the galaxy quenching

Journal of High Energy Astrophysics
In light of increasing observational evidence supporting the existence of ultra-compact objects, we adopt the term astrophysical black hole to refer to any object having a huge mass confined within a sufficiently small region of spacetime. This terminology encompasses both the classical black hole solutions predicted by general relativity, as well as ...
Jay Verma Trivedi, Pankaj S. Joshi, Gopal Krishna, Peter L. Biermann   +3 more
openaire   +2 more sources

Redshifts of 19 shakhbazian compact groups of galaxies [PDF]

, 2010
By observations at Calar Alto (Spain), La Silla (Chile) and Cananea (Mexico), we measured redshifts of 108 candidate members in 19 Shakhbazian compact galaxy groups ShCG 44, 105, 149, 168, 270, 276, 278, 279, 298, 303, 304, 310, 317, 331, 339, 340, 345 ...
Tovmassian Hrant, Vahram Chavushyan
core  

When Communication Enables Catastrophe: Nuclear Risk and the Short Lifetimes of Technological Civilizations

Risk Analysis, Volume 46, Issue 9, September 2026.
ABSTRACT The Fermi paradox may partly reflect technological self‐destruction acting as a Great Filter during post‐industrial development. Because the empirical record consists of a single civilization observed over an eighty‐year nuclear age, the exercise reported here is best understood as a structured, historically anchored scenario analysis rather ...
Vincenzo Alfano
wiley   +1 more source

The ORCA‐TWIN qCMOS Experiment I. Science Case and Commissioning at Calar Alto Observatory

Astronomische Nachrichten, Volume 347, Issue 7, August 2026.
ABSTRACT We describe a pilot study to explore a new generation of fast and low noise CMOS image sensors for time domain astronomy, using two remote telescopes with a baseline of 1635 km. The experiment involves direct imaging with novel qCMOS image sensor technology that combines fast readout with sub‐electron readout noise.
Martin M. Roth, Paško Roje, Stella Vješnica, Stefan Cikota, Alex J. Brown, Mike Kretlow, Marco Azzaro, Santiago Reinhart, Jesús Aceituno, Harry Dawson, Carsten Denker, Torsten Enßlin, Stephan Geier, Thomas Granzer, Thomas Kupfer, Gianluca Li Causi, Samaya Nissanke, José Luis Ortiz, Fernando Pedichini, Katja Poppenhäger, Axel Schwope   +20 more
wiley   +1 more source

The properties of discrete X-ray sources in star-forming galaxies [PDF]

, 2012
Observations of starburst galaxies have revealed a large number of point-like X-ray sources located within these systems, including active galactic nuclei (AGN), X-ray binaries (XRBs), and utraluminous X-ray sources (ULXs).
JACKSON, FLOYD,EMMANUEL
core  

Revisiting Variable Stars Toward the Globular Cluster NGC 6496 With ATLAS and Gaia Photometry

Astronomische Nachrichten, Volume 347, Issue 7, August 2026.
ABSTRACT We revisit 13 variable stars in the field of the metal‐rich globular cluster NGC 6496, discovered by Abbas et al. (2015; Astronomical Journal 149:40) (hereafter referred to as “MA15”) via time‐series data, spanning 2 years. We improve upon the MA15 characterization of the variables using ATLAS time‐series photometry data, spanning 8 years, in ...
Madison E. Martin, Andrew Layden, Andrew McNeill   +2 more
wiley   +1 more source

Galaxy Winds in the Age of Hyperdimensional Astrophysics

, 2019
The past decade began with the first light of ALMA and will end at the start of the new era of hyperdimensional astrophysics. Our community-wide movement toward highly multiwavelength and multidimensional datasets has enabled immense progress in each science frontier identified by the 2010 Decadal Survey, particularly with regard to black hole feedback
Tremblay, Grant R., Schneider, Evan E., Vikhlinin, Alexey, Hernquist, Lars, Ruszkowski, Mateusz, Oppenheimer, Benjamin D., Kraft, Ralph P., ZuHone, John, McDonald, Michael A., Gaspari, Massimo, Donahue, Megan, Voit, G. Mark   +11 more
openaire   +2 more sources

Groups of galaxies in the Center for Astrophysics redshift survey

The Astrophysical Journal, 1989
By applying the Huchra and Geller (1982) objective group identification algorithm to the Center for Astrophysics' redshift survey, a catalog of 128 groups with three or more members is extracted, and 92 of these are used as a statistical sample. A comparison of the distribution of group centers with the distribution of all galaxies in the survey ...
Massimo Ramella, Margaret J. Geller, John P. Huchra   +2 more
openaire   +1 more source

Observations of the 57Fe+23 hyperfine transition in clusters of galaxies [PDF]

, 1997
We present a search for the hyperfine transition of the 57Fe+23 ion at 3.071 mm in clusters of galaxies with the ATNF Mopra telescope. The results are compared with a realistic estimate of the peak brightness temperature of the line in a cooling flow ...
Moorey, G, Ekers, RD, Dickey, JM, Liang, H   +3 more
core  

The Atlas3D project -- XXIX. The new look of early-type galaxies and surrounding fields disclosed by extremely deep optical images [PDF]

, 2014
P-AD acknowledges support from Agence Nationale de la Recherche (ANR10-BLANC-0506-01). LM-D acknowledges support from the Lyon Institute of Origins under grant ANR-10-LABX-66.
Davis, T., Cuillandre, Jean Charles, Morganti, R., Karabal, E., McDermid, R., Cuillandre, J.-C., Weijmans, A.-M., Blitz, L., McDermid, R. M., Emsellem, Eric, Crocker, A. F., Oosterloo, Tom, Michel-Dansac, Leo, Michel-Dansac, L., Weijmans, A., Sarzi, Marc, Davies, R., Davis, Timothy, Alatalo, Katherine, Davies, Roger L., Serra, Paolo, Davis, Timothy A., Scott, Nicholas, Weijmans, Anne-Marie, Paudel, S., Khochfar, Sadegh, Krajnović, D., Khochfar, S., Blitz, Leo, Bournaud, Frederic, Serra, P., Bureau, Martin, Oosterloo, Tom A., Crocker, Alison F., Kuntschner, Harald, Paudel, Sanjaya, Kuntschner, H., de Zeeuw, P. T., Cappellari, Michele, Duc, P.-A., Bournaud, F., Scott, N., Bureau, M., Karabal, Emin, Naab, T., Young, L., Krajnovic, Davor, Krajnovi, D., Duc, Pierre-Alain, de Zeeuw, P., Davies, R. L., McDermid, Richard M., Alatalo, K., Cuillandre, Jean-Charles, Cuillandre, J., Crocker, A., Morganti, Raffaella, Duc, P., Emsellem, E., Cappellari, M., Oosterloo, T., Young, Lisa M., Naab, Thorsten, Sarzi, M., Young, L. M., de Zeeuw, P.T.   +65 more
core   +2 more sources