Results 111 to 120 of about 553,808 (287)

The Contribution of Late-type/Irregulars to the Faint Galaxy Counts from HST Medium Deep Survey Images [PDF]

, 1995
We present a complete morphologically classified sample of 144 faint field galaxies from the HST Medium Deep Survey with 20.0 < I
Driver, Simon P., Griffiths, Richard E., Windhorst, Rogier A.   +2 more
core   +2 more sources

Subterranean environments contribute to three‐quarters of classified ecosystem services

Biological Reviews, EarlyView.
ABSTRACT Beneath the Earth's surface lies a network of interconnected caves, voids, and systems of fissures forming in rocks of sedimentary, igneous, or metamorphic origin. Although largely inaccessible to humans, this hidden realm supports and regulates services critical to ecological health and human well‐being.
Stefano Mammola, David Brankovits, Tiziana Di Lorenzo, Isabel R. Amorim, Raluca Ioana Bancila, Adrià Bellvert, Enrico Bernard, Anna Blomberg, Paulo A.V. Borges, Martina Cappelletti, Rodrigo Lopes Ferreira, Rosalina Gabriel, Diana M. P. Galassi, Laura Garzoli, Vasilis Gerovasileiou, Grant C. Hose, Kathryn L. Korbel, Simone Martino, Ana Z Miller, Nataša Mori, Veronica Nanni, Giuseppe Nicolosi, Mattia Saccò, Troy S. Sakihara, Marconi Souza Silva, Anne E. Tamalavage, Maja Zagmajster, Efraín Chávez, Christian Griebler, Pedro Cardoso, Alejandro Martínez   +30 more
wiley   +1 more source

H i Observations of Giant Low Surface Brightness Galaxies

The Astrophysical Journal
Giant low surface brightness (gLSB) galaxies are galaxies with extremely extended, faint, optical disks over 50 kpc in radius and have high total masses, which can reach 10 ^12 M _⊙ .
Philip Lah, Nikhil Arora, Ivan Yu. Katkov, Joseph D. Gelfand, Anna S. Saburova, Igor V. Chilingarian, Ivan Gerasimov, Damir Gasymov   +7 more
doaj   +1 more source

The census of nuclear activity of late-type galaxies in the Virgo cluster [PDF]

, 2007
The first spectroscopic census of active galactic nuclei (AGNs) associated with late-type galaxies in the Virgo cluster was carried out by observing 213 out of a complete set of 237 galaxies more massive than M dyn > 108.5 MM⊙.Among them, 77 are ...
R. Decarli, G. Gavazzi, I. Arosio, L. Cortese, A. Boselli, C. Bonfanti, M. Colpi   +6 more
semanticscholar   +1 more source

The nature of the SDSS galaxies in various classes based on morphology, colour and spectral features -- I. Optical properties

, 2008
We present a comprehensive study of the nature of the SDSS galaxies divided into various classes based on their morphology, colour, and spectral features. The SDSS galaxies are classified into early-type and late-type; red and blue; passive, HII, Seyfert,
Abraham, Adelman-McCarthy, Bailin, Baldwin, Ball, Bernardi, Bernardi, Blanton, Blanton, Bruzual, Cattaneo, Changbom Park, Choi, Conselice, Couch, Cowie, De Vaucouleurs, De Vaucouleurs, Dressler, Ellis, Elston, Ferreras, Gallazzi, Hubble, Hwang, Im, Im, Joon Hyeop Lee, Kauffmann, Kauffmann, Kauffmann, Kewley, Kodama, Kormendy, La Barbera, Lee, Lee, Liske, Martin, Mateus, Menanteau, Michard, Myung Gyoon Lee, Park, Park, Park, Sandage, Sandage, Sanders, Schlegel, Stoughton, Tamura, Tegmark, Thuan, Tremonti, Treu, Yamauchi, Yang, Yang, York, Yoshino, Yun-Young Choi   +61 more
core   +1 more source

Observed Evidence for the Primordial Origin of Galaxy Sizes

The Astrophysical Journal
We present observational evidence supporting the scenario that the protogalactic angular momenta play an important role in molding the optical sizes of present galaxies. Analyzing the NASA-Sloan Atlas catalog in the redshift range of 0.02 ≤ z  
Jun-Sung Moon, Jounghun Lee
doaj   +1 more source

New morpho-kinematic classification: The two-dimensional spatial distribution of stellar specific angular momentum in late-type galaxies

Astronomy & Astrophysics
Aims. The two-dimensional spatial distribution of stellar specific angular momentum (sAM) within galaxies has never been analysed. We seek to identify the morpho-kinematics of this property and its correlation with the total stellar sAM (j★) and the ...
Pacheco-Arias Juan Manuel, Amram Philippe, Epinat Benoît, Mercier Wilfried   +3 more
doaj   +1 more source

Extended Hot Halos Around Isolated Galaxies Observed in the ROSAT All-Sky Survey

, 2012
We place general constraints on the luminosity and mass of hot X-ray emitting gas residing in extended "hot halos" around nearby massive galaxies. We examine stacked images of 2165 galaxies from the 2MASS Very Isolated Galaxy Catalog (2MVIG), as well as ...
Anderson, Michael E., Bregman, Joel N., Dai, Xinyu   +2 more
core   +1 more source

Application of the Limit Cycle Model to Star Formation Histories in Spiral Galaxies: Variation among Morphological Types [PDF]

, 2000
We propose a limit-cycle scenario of star formation history for any morphological type of spiral galaxies. It is known observationally that the early-type spiral sample has a wider range of the present star formation rate (SFR) than the late-type sample.
Cappellaro E., Habe A., Hideyuki Kamaya, Hiroyuki Hirashita, Ikeuchi S., Ikeuchi S., Ikeuchi S., Kamaya H., Nozakura T., Sandage A., Tainaka K., Tomita A.   +11 more
core   +2 more sources

Spitzer Uncovers Active Galactic Nuclei Missed by Optical Surveys in Seven Late-Type Galaxies [PDF]

, 2008
We report the discovery using Spitzer's high-resolution spectrograph of seven active galactic nuclei (AGNs) in a sample of 32 late-type galaxies that show no definitive signatures of AGNs in their optical spectra.
S. Satyapal, D. Vega, R. Dudik, R. Dudik, N. Abel, T. Heckman   +5 more
semanticscholar   +1 more source