Results 31 to 40 of about 83,866 (252)

Wide Binaries and the Age of the Galaxy [PDF]

Symposium - International Astronomical Union, 1999
Using B, V, R, I photometric parallaxes for components of wide binaries, new bolometric corrections by Bergeron et al. (1995) and cooling curves by Wood (1995), we have determined the white dwarf luminosity function (WDLF; Oswalt et al. 1996). A minimum age of 9.5+1.1−0.8 Gyr is implied for the Galactic disk; arbitrarily old models are consistent at ...
T.D. Oswalt, J.A. Smith, M.A. Wood
openaire   +1 more source

Dual Supermassive Black Hole Candidates in the AGN and Galaxy Evolution Survey

, 2013
Dual supermassive black holes (SMBHs) with kiloparsec scale separations in merger-remnant galaxies are informative tracers of galaxy evolution, but the avenue for identifying them in large numbers for such studies is not yet clear. One promising approach
Comerford, Julia M., Cool, Richard J., Greene, Jenny E., Schluns, Kyle   +3 more
core   +1 more source

Star Formation Histories of Nearby Elliptical Galaxies. II. Merger Remnant Sample [PDF]

, 2006
This work presents high $S/N$ spectroscopic observations of a sample of six suspected merger remnants, selected primarily on the basis of H{\sc i} tidal debris detections.
Heckman T., Justin H. Howell, Kauffmann G., Larson R., Nagashima M., Prugniel P., van Driel W.   +6 more
core   +3 more sources

SDSS-IV MaNGA: The Effect of Stellar Mass and Halo Mass on the Assembly Histories of Satellite Galaxies

The Astrophysical Journal, 2023
We combine an unprecedented MaNGA sample of over 3000 passive galaxies in the stellar mass range 10 ^9 –10 ^12 M _⊙ with the Sloan Digital Sky Survey group catalog by Tinker to quantify how central and satellite formation, quantified by radial profiles ...
Grecco A. Oyarzún, Kevin Bundy, Kyle B. Westfall, Ivan Lacerna, Renbin Yan, J. R. Brownstein, Niv Drory, Richard R. Lane   +7 more
doaj   +1 more source

Elliptical Galaxies: The Age — Metallicity Dilemma [PDF]

Symposium - International Astronomical Union, 1996
In this paper, we briefly report on the study by Bressan et al. (1995, BCT) who examine the properties of elliptical galaxies in the space of the parameters Hβ, [MgFe], (1550-V), and velocity dispersion Σ, try to infer the age of these systems, and cast light on the age-metallicity dilemma.
openaire   +1 more source

Subsystems of the Galactic halo, their structures and compositions

Odessa Astronomical Publications, 2017
It is shown that general populations of globular clusters and metal-poor field stars are components at least of three subsystems occupying different volumes in the Galaxy.
V. A. Marsakov, T. V. Borkova
doaj   +1 more source

Study of DDO 68: nearest candidate for a young galaxy? [PDF]

, 2005
We present the results of optical spectroscopy and imaging with the SAO 6m telescope for the dwarf galaxy DDO 68 (UGC 5340 = VV 542), falling into the region of very low density of luminous (L > L*) galaxies (Lynx-Cancer void).
A. G. Pramskij, A. Y. Kniazev, Afanasiev, Alloin, Asplund, Bohlin, Brown, Chengalur, Efremov, Elmegreen, Elmegreen, Elmegreen, Fioc, Gil de Paz, González Delgado, Gottlöber, Grogin, Hopp, Huchtmeier, Izotov, Izotov, Izotov, Izotov, Izotov, Karachentsev, Kniazev, Kniazev, Kniazev, Kniazev, Kunth, Kunth, Larsen, Lee, Leitherer, Lindner, Lipovetsky, Makarova, Makarova, Manning, Nakos, Papaderos, Papaderos, Peebles, Plante, Pustilnik, Pustilnik, Pustilnik, Pustilnik, Pustilnik, Pustilnik, Rojas, S. A. Pustilnik, Salzer, Salzer, Schlegel, Searle, Shergin, Stasinska, Stil, Stil, Thuan, Trentham, van Dyk, van Zee, van Zee, van Zee, Vazquez, Weilbacher, Östlin   +68 more
core   +1 more source

The Age of Elliptical Galaxies in Clusters [PDF]

Symposium - International Astronomical Union, 1996
Nearby cluster ellipticals follow a very tight relation between velocity dispersion σ and Mg absorption (e.g. Bender et al. 1993, ApJ411, 153). The small scatter in Mg implies that the age and metallicity spread at a given σ in ellipticals is smaller than 15% (applying Worthey's population synthesis models 1994, ApJS95, 107).
Bodo Ziegler, Ralf Bender
openaire   +1 more source

Arp 220: A Post-starburst Galaxy with Little Current Star Formation outside of Its Nuclear Disks

The Astrophysical Journal, 2023
The ultraluminous infrared galaxy Arp 220 is a late-stage merger with several tidal structures in the outskirts and two very compact, dusty nuclei that show evidence for extreme star formation and host at least one active galactic nucleus (AGN).
Rupali Chandar, Miranda Caputo, Sean Linden, Angus Mok, Bradley C. Whitmore, Daniela Calzetti, Debra M. Elmegreen, Janice C. Lee, Leonardo Ubeda, Richard White, David O. Cook   +10 more
doaj   +1 more source

Stellar kinematics and populations out to 1.5 effective radius in the elliptical galaxy NGC4636

, 2011
We present high quality long slit spectra along the major and minor axes out to 1.5 effective radius ($R_e$) of the massive galaxy NGC4636 taken by Hobby-Eberly Telescope (HET).
Bell, Bender, Bender, Bender, Bender, Bender, Bernardi, Chakrabarty, Clemens, Davies, Faber, Hill, Hopkins, Kauffmann, Kim, Kormendy, Larson, Larson, Lee, Lisker, Matković, Mehlert, Nieto, O'Sullivan, Park, Posson-Brown, Rogers, Saglia, Shi-Bi Pu, Tantalo, Tantalo, Thomas, Thomas, Tinsley, Tonry, Trager, Trager, Vazdekis, White, White, Zhan-Wen Han, Ziegler   +41 more
core   +1 more source