High resolution soft x-ray spectroscopy of the elliptical galaxy NGC 5044. Results from the reflection grating spectrometer on-board XMM-Newton [PDF]
, 2002 The results from an X-ray spectroscopic study of the giant elliptical galaxy NGC 5044 in the center of a galaxy group are presented. The line dominated soft X-ray spectra (mainly Fe-L and $\ion{O}{viii}$ ${\rm Ly\alpha}$) from the diffuse gas are ...
T. Tamura +3 more
semanticscholar +1 more source
Chandra Observations of Gas Stripping in the Elliptical Galaxy NGC 4552 in the Virgo Cluster [PDF]
, 2005 We use a 54.4 ks Chandra observation to study ram pressure stripping in NGC 4552 (M89), an elliptical galaxy in the Virgo Cluster. Chandra images in the 0.5-2 keV band show a sharp leading edge in the surface brightness 3.1 kpc north of the galaxy center,
M. Machacek +4 more
semanticscholar +1 more source
UV Visibility of Moderate-Redshift Giant Elliptical Galaxies [PDF]
Journal of Astronomy and Space Sciences, 1998 We show quantitatively whether giant elliptical galaxies would be visible at far UV wavelengths if they were placed at moderate redshift of 0.4-0.5. On the basis of simple cosmological tests, we conclude that giant elliptical galaxies can be detectable ...
Myung-Hyun Rhee +3 more
doaj
Can We Discover Physical Models Using Machine Learning? A Case Study of Galaxy Sizes
The Astrophysical JournalWe explore the ability of machine learning methods to discover underlying equations of physics by searching for the equations governing galaxy size in a semianalytic model. This case study allows us to evaluate the process as we know the ground truth. We
Festa Buçinca-Çupallari +4 more
doaj +1 more source
The elliptical galaxy colour–magnitude relation as a discriminant between the monolithic and merger paradigms [PDF]
, 2004 The colour-magnitude relation (CMR) of cluster elliptical galaxies has been widely used to constrain their star formation histories (SFHs) and to discriminate between the monolithic collapse and merger paradigms of elliptical galaxy formation.
S. Kaviraj +3 more
semanticscholar +1 more source
Near-IR TRGB Distance to Dwarf Elliptical Galaxy NGC 147 [PDF]
Journal of Astronomy and Space Sciences, 2007 We report the distance modulus of nearby dwarf elliptical galaxy NGC 147 estimated from the Tip of Red-giant Branch (TRGB) method applying to the color-magnitude diagrams and luminosity functions in the near-infrared JHK bands.
A. Kang +5 more
doaj +1 more source
Geometrical evidence for dark matter: X-ray constraints on the mass of the elliptical galaxy NGC 720 [PDF]
, 1993 We describe (1) a new test for dark matter and alternate theories of gravitation based on the relative geometries of the X-ray and optical surface brightness distributions and an assumed form for the potential, of the optical light, (2) a technique to ...
D. Buote, C. Canizares
semanticscholar +1 more source
The Effect of Superpositions on the Planetary Nebula Luminosity Function
The Astrophysical Journal, 2023 Planetary nebula (PN) surveys in systems beyond ∼10 Mpc often find high-excitation, point-like sources with [O iii ] λ 5007 fluxes greater than the apparent bright-end cutoff of the planetary nebula luminosity function (PNLF).
Owen Chase +3 more
doaj +1 more source
Simulations of Galaxy Formation in a ΛCDM Universe. III. The Dissipative Formation of an Elliptical Galaxy [PDF]
, 2003 We examine the dynamical structure of an elliptical galaxy simulated in the ΛCDM scenario. The morphology of the galaxy evolves dramatically over time in response to the mode and timing of mass accretion; smooth deposition of cooled gas leads to the ...
A. Meza +3 more
semanticscholar +1 more source
The Astrophysical Journal Letters, 2023 Minor mergers are thought to drive the structural evolution of massive quiescent galaxies; however, existing Hubble Space Telescope (HST) imaging is primarily sensitive to stellar mass ratios ≳1:10.
Katherine A. Suess +19 more
doaj +1 more source