Results 131 to 140 of about 688,273 (301)

Star formation in bulgeless late type galaxies: clues to their evolution

, 2012
We present GMRT 1280 MHz radio continuum observations and follow-up optical studies of the disk and nuclear star formation in a sample of low luminosity bulgeless galaxies. The main aim is to understand bulge formation and overall disk evolution in these
Baggett, Banerjee, Bell, Boissier, Boselli, Brook, Brook, Böker, Böker, Böker, Böker, C. Sengupta, Cao, Combes, Daddi, Das, de Blok, D’Onghia, Ferrarese, Filippenko, Filippenko, Ganda, Gebhardt, Gil de Paz, Gil de Paz, Gliozzi, Governato, Gültekin, Heckman, James, K. Misra, Karachentsev, Kautsch, Kennicutt, Kinney, Kormendy, Kormendy, Kormendy, Kormendy, Kormendy, M. Das, Martinez-Valpuesta, Matthews, McAlpine, Neumayer, Oke, Peterson, Phookun, Pilyugin, Popescu, Raha, Ramya, Ravindranath, Roussel, S. Ramya, Salucci, Satyapal, Satyapal, Sellwood, Seth, Shields, Silk, Smith, Smith, Swarup, Walcher, Waller, Watson, White, Young, Zackrisson   +70 more
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Detection of high Lyman continuum leakage from four low-redshift compact star-forming galaxies [PDF]

, 2016
Following our first detection reported in Izotov et al. (2016), we present the detection of Lyman continuum (LyC) radiation of four other compact star-forming galaxies observed with the Cosmic Origins Spectrograph (COS) onboard the Hubble Space Telescope
Y. Izotov, D. Schaerer, T. Thuan, G. Worseck, N. Guseva, I. Orlitová, A. Observatory, Ukrainian National Academy of Sciences, Kyiv, Ukraine, Observatoire de Geneve, Versoix, Switzerland., Irapcnrs, Toulouse, France., A. Department, U. Virginia, Charlottesville, Usa, M. Astronomie, Heidelberg, H Germany, A. Institute, C. A. O. Sciences, Prague, Czech Republic   +26 more
semanticscholar   +1 more source

The Optical Variability of the BL Lac AO 0235+164

Galaxies, 2016
In this work, we present optical R band observations of AO 0235+164 carried out during the period of November 2006 to December 2012 using the Ap6E CCD camera attached to the primary focus of the 70 cm meniscus telescope at Abastumani Observatory, Georgia.
Junhui Fan, Omar Kurtanidze, Yi Liu, Xiang Liu, Gotthard M. Richter, Maria G. Nikolashvili, Sophia O. Kurtanidze, Revaz Chanishvili, Hongtao Wang, Mahito Sasada, Aiying Zhou, Chao Lin, Yuhai Yuan   +12 more
doaj   +1 more source

Theoretical Re-evaluations of Scaling Relations between SMBHs and Their Host Galaxies—1. Effect of Seed BH Mass

Frontiers in Astronomy and Space Sciences, 2017
We use a semi-analytic model of galaxy formation and investigate how the mass of a seed black hole affect the scaling relation between black hole mass and bulge mass at z ~ 0.
Hikari Shirakata, Toshihiro Kawaguchi, Takashi Okamoto, Ryu Makiya, Ryu Makiya, Tomoaki Ishiyama, Yoshiki Matsuoka, Masahiro Nagashima, Motohiro Enoki, Taira Oogi, Masakazu A. R. Kobayashi   +10 more
doaj   +1 more source

The Role of Starbursts in the Formation of Galaxies & Active Galactic Nuclei

, 1999
Starbursts are episodes of intense star-formation in the central regions of galaxies, and are the sites of roughly 25% of the high-mass star-formation in the local universe.
Buat V., C. S. Frenk, Dunlop J., S. D. M. White, Schmitt H., Timothy Heckman   +5 more
core   +1 more source

COSMIC REIONIZATION AND EARLY STAR-FORMING GALAXIES: A JOINT ANALYSIS OF NEW CONSTRAINTS FROM PLANCK AND THE HUBBLE SPACE TELESCOPE [PDF]

, 2015
We discuss new constraints on the epoch of cosmic reionization and test the assumption that most of the ionizing photons responsible arose from high-redshift star-forming galaxies.
B. Robertson, R. Ellis, S. Furlanetto, J. Dunlop   +3 more
semanticscholar   +1 more source

RECONCILING DWARF GALAXIES WITH ΛCDM COSMOLOGY: SIMULATING A REALISTIC POPULATION OF SATELLITES AROUND A MILKY WAY–MASS GALAXY [PDF]

, 2016
Low-mass “dwarf” galaxies represent the most significant challenges to the cold dark matter (CDM) model of cosmological structure formation. Because these faint galaxies are (best) observed within the Local Group (LG) of the Milky Way (MW) and Andromeda (
A. Wetzel, P. Hopkins, Ji-hoon Kim, C. Faucher-Giguére, D. Keres̆, E. Quataert   +5 more
semanticscholar   +1 more source

Hot Stars, Young Stellar Populations and Dust with Swift/UVOT

Universe
In this review, we highlight the contributions made by the Swift/UVOT instrument to the understanding of the ultraviolet (UV) attenuation and extinction properties of interstellar dust and provide insight into hot stars and young stellar populations. The
Michael H. Siegel, Caryl Gronwall
doaj   +1 more source

Velocity Dispersion of 335 Galaxy Clusters Selected from the Sloan Digital Sky Survey: Statistical Evidence for Dynamical Interaction, and Against Ram-Pressure Stripping

, 2005
There has been plenty of observational evidence of cluster galaxy evolution. However, it has been difficult to identify the origin of the cluster galaxy evolution. Here we show that gravitational interaction/friction between galaxies is the statistically
Abadi, Abazajian, Adami, Adami, Andreon, Andreon, Andreon, Beers, Bekki, Bennett, Biviano, Biviano, Blanton, Butcher, Butcher, Carlberg, Couch, Couch, Czoske, Danese, Dressler, Ellingson, Fabricant, Farouki, Fasano, Finn, Fujita, Fujita, Fujita, Gal, Goto, Goto, Goto, Goto, Goto, Goto, Goto, Goto, Goto, Goto, Goto, Gunn, Gómez, Icke, Jones, Kauffmann, Kauffmann, Kennicutt, Kent, Kodama, Kodama, Lares, Larson, Lavery, Makino, Mamon, Mamon, Margoniner, Margoniner, McIntosh, Moore, Moore, Ostriker, Poggianti, Postman, Postman, Postman, Quilis, Rakos, Schlegel, Shimasaku, Sodre, Stein, Strateva, Tanaka, Tomotsugu Goto, Treu, van Dokkum, Yamauchi, Zabludoff   +79 more
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Spitzer Observations of Passive and Star Forming Early-type Galaxies: an Infrared Color-Color Sequence

, 2009
We describe the infrared properties of a large sample of early type galaxies, comparing data from the Spitzer archive with Ks-band emission from 2MASS.
Baldry, Calzetti, Dale, Fabrizio Brighenti, Huchtmeier, Huchtmeier, Kannappan, Kannappan, Kennicutt, Knapp, Makovoz, Nilson, Pasquale Temi, Rieke, Sadler, Sage, Sage, Sil'chenko, Skrutskie, Temi, Temi, Temi, Tonry, Welch, Werner, Wiklind, William G. Mathews, Young, Young, Young   +29 more
core   +1 more source