Zobrazeno 1 - 10
of 80
pro vyhledávání: '"Block, D. L."'
Power spectra of Large Magellanic Cloud (LMC) emission at 24, 70 and 160 microns observed with the Spitzer Space Telescope have a two-component power-law structure with a shallow slope of -1.6 at low wavenumber, k, and a steep slope of -2.9 at high k
Externí odkaz:
http://arxiv.org/abs/1006.2080
Autor:
Buta, R. J., Knapen, J. H., Elmegreen, B. G., Salo, H., Laurikainen, E., Elmegreen, D. M., Puerari, I., Block, D. L.
We present deep near-infrared K_s-band AAT IRIS2 observations of a selected sample of nearby barred spiral galaxies, including some with the strongest known bars. The sample covers a range of Hubble types from SB0- to SBc. The goal is to determine if
Externí odkaz:
http://arxiv.org/abs/0903.2008
Autor:
Block, D. L., Bournaud, F., Combes, F., Groess, R., Barmby, P., Ashby, M. L. N., Fazio, G. G., Pahre, M. A., Willner, S. P.
Publikováno v:
Nature 443:832-834,2006
The unusual morphology of the Andromeda Spiral (Messier 31, the closest spiral galaxy to the Milky Way) has long been an enigma. Although regarded for decades as showing little evidence of a violent history, M~31 has a well-known outer ring of star f
Externí odkaz:
http://arxiv.org/abs/astro-ph/0610543
Autor:
Block, D. L., Puerari, I., Fazio, G. G., Stockton, A., Canalizo, G., Freeman, K. C., Jarrett, T. H., Combes, F., Groess, Robert, Worthey, G., Gehrz, R. D., Woodward, C. E., Polomski, Elisha F.
The Triangulum Spiral Galaxy Messier 33 offers unique insights into the building of a galactic disk. We identify spectacular arcs of intermediate age (0.6 Gyr - 2 Gyr) stars in the low-metallicity outer disk. The northern arc spans approx. 120 degree
Externí odkaz:
http://arxiv.org/abs/astro-ph/0610575
Publikováno v:
Astron.J.132:1859-1876,2006
This paper reports on a near-infrared survey of early-type galaxies designed to provide information on bar strengths, bulges, disks, and bar parameters in a statistically well-defined sample of S0-Sa galaxies. Early-type galaxies have the advantage t
Externí odkaz:
http://arxiv.org/abs/astro-ph/0609406
Publikováno v:
Mon.Not.Roy.Astron.Soc. 359 (2005) 1065-1076
In the last decade, near-infrared imaging has highlighted the decoupling of gaseous and old stellar disks: the morphologies of optical (Population I) tracers compared to the old stellar disk morphology, can be radically different. Galaxies which appe
Externí odkaz:
http://arxiv.org/abs/astro-ph/0502587
Autor:
Block, D. L., Freeman, K. C., Jarrett, T. H., Puerari, I., Worthey, G., Combes, F., Groess, R.
Publikováno v:
Astron.Astrophys. 425 (2004) L37-L40
Stars with masses in the range from about 1.3 to 3.5 Mo pass through an evolutionary stage where they become carbon stars. In this stage, which lasts a few Myr, these stars are extremely luminous pulsating giants. They are so luminous in the near-inf
Externí odkaz:
http://arxiv.org/abs/astro-ph/0406485
We have obtained deep near-infrared K_s-band William Herschel Telescope observations of a sample of 15 nearby spiral galaxies having a range of Hubble types and apparent bar strengths. The near-infrared light distributions are converted into gravitat
Externí odkaz:
http://arxiv.org/abs/astro-ph/0405227
The Hubble classification scheme of galaxies is based on blue-light appearance. Atlases reveal the rich variety of responses of the Population I component (`the mask') of gas and dust to the underlying, older, stellar population. However, the Populat
Externí odkaz:
http://arxiv.org/abs/astro-ph/0402113
Publikováno v:
Astron.J. 126 (2003) 1148
We describe a Fourier-based method of separating bars from spirals in near-infrared images. The method takes advantage of the fact that a bar is typically a feature with a relatively fixed position angle, and uses the simple assumption that the relat
Externí odkaz:
http://arxiv.org/abs/astro-ph/0305427