Results 81 to 90 of about 314,301 (152)

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

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
core   +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
core   +1 more source

Dust at the Cosmic Dawn

Galaxies
Observations provided by the Hubble Space Telescope (HST) and James Webb Space Telescope (JWST) have revealed a surprising abundance of galaxies at the “cosmic dawn” epoch, z>7. Some of them are found even in a more distant universe at z ≃ 14–16. Most of
Yuri A. Shchekinov, Biman B. Nath
doaj   +1 more source

Study on the Gamma-Ray Radiation Properties of High-Redshift Blazars at z > 2.5

Universe
The high-redshift blazars are important cosmological probes for exploring the early universe and unraveling the fundamental emission processes and the structure of the active galactic nuclei.
Fan Wu, Li Zhang, Benzhong Dai
doaj   +1 more source

Probing cosmic voids with emission-line galaxies

Frontiers in Astronomy and Space Sciences
IntroductionWe aim to provide forecasts for future line intensity mapping (LIM) observations and galaxy redshift surveys, focusing on the physical properties of low-density region of the cosmic web (voids).
Yuka Yamada, Naoki Yoshida, Naoki Yoshida   +2 more
doaj   +1 more source

Comparative Photometry of the Quiet Quasar PDS 456 and the Radio-Loud Blazar 3C 273

Galaxies
A comparative analysis of the photometric variability of the blazar 3C 273 and the quasar PDS 456 using multi-band data from ground- and space-based platforms (2015–2025) reveals contrasting behaviors.
Alberto Silva Betzler, Ingrid dos Santos Delfino, Agábio Brasil dos Santos, Roberto Mendes Dias, Orahcio Felicio de Sousa   +4 more
doaj   +1 more source

A Morphological Identification and Study of Radio Galaxies from LoTSS DR2 II. Strange and Odd Morphology Extragalactic Radio Sources ‘STROMERSs’

Galaxies
STRange and Odd Morphology Extragalactic Radio Sources (STROMERSs) is a new category of radio galaxies that shows extremely peculiar anatomy. A purely manual visual search is carried out for the identification of such interesting sources.
Tapan K. Sasmal, Soumen Kumar Bera, Xuelei Chen, Yougang Wang, Soumen Mondal, Taotao Fang   +5 more
doaj   +1 more source

The Host Galaxy Fluxes of Active Galaxy Nuclei Are Generally Overestimated by the Flux Variation Gradient Method

Universe
In terms of the variable nature of normal active galaxy nuclei (AGN) and luminous quasars, a so-called flux variation gradient (FVG) method has been widely utilized to estimate the underlying non-variable host galaxy fluxes.
Minxuan Cai, Zhen Wan, Zhenyi Cai, Lulu Fan, Junxian Wang   +4 more
doaj   +1 more source

Ratios of forbidden [OIII] λλ4959,5007 and [NII] λλ6548,6583 lines in nearby narrow emission line galaxies

Frontiers in Astronomy and Space Sciences
Galaxies with narrow emission lines play a crucial role in testing the theoretical values of transition probabilities, especially for lines that need conditions that are hard to produce in laboratory plasma, and hence the theoretical values could not be ...
Natas̆a Bon, Edi Bon, Paola Marziani, Luka C̆. Popović   +3 more
doaj   +1 more source