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Astronomers discover metal-rich galaxies in early universe
宇宙 富含金属 星系
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2023/5/17
Scanning the first images of a well-known early galaxy taken by NASA’s James Webb Space Telescope (JWST), Cornell astronomers were intrigued to see a blob of light near its outer edge.
Multiwavelength Observations of the Gas-rich Host Galaxy of PDS 456: A New Challenge for the ULIRG-to-QSO Transition Scenario
PDS 456 IRAS 08572+3915
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2014/12/24
We report new K-band, radio continuum, and CO (1-0) imaging observations and 850 μm photometric observations of PDS 456, the most luminous QSO in the local universe (z < 0.3). The 06 resolution K-band...
Stellar lifetime and ultraviolet properties of the old metal-rich Galactic open cluster NGC6791: a pathway to understand the UV upturn of elliptical galaxies
Stellar lifetime ultraviolet properties old metal-rich Galactic cluster NGC6791 UV upturn elliptical galaxies
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2012/2/23
The evolutionary properties of the old metal-rich Galactic open cluster NGC6791 are assessed, based on deep UB photometry and 2Mass JK data. For 4739 stars in the cluster, bolometric luminosity and ef...
Galaxy Zoo: Dust lane early-type galaxies are tracers of recent, gas-rich minor mergers
galaxies: evolution — galaxies: interactions — galaxies: active — galax-ies: elliptical and lenticular
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2011/10/17
We present the second of two papers concerning the origin and evolution of local early-type galaxies exhibiting dust features. We use optical and radio data to examine the nature of AGN activity in th...
The Small Isolated Gas Rich Irregular Dwarf (SIGRID) Galaxy Sample: Description and First Results
Small Isolated Irregular Dwarf Galaxy Sample: Description First Results
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2011/10/12
Using an optically-unbiased selection process based on the HIPASS neutral hydrogen survey, we have selected a sample of 83 spatially isolated, gas-rich dwarf galaxies in the southern hemisphere with c...
The Baryonic Tully-Fisher Relation of Gas Rich Galaxies as a Test of LCDM and MOND
Baryonic Tully-Fisher Relation Rich Galaxies LCDM MOND
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2011/10/9
The Baryonic Tully-Fisher Relation (BTFR) is an empirical relation between baryonic mass and rotation velocity in disk galaxies. It provides tests of galaxy formation models in LCDM and of alternative...
An aluminum/calcium-rich, iron-poor, white dwarf star: evidence for an extrasolar planetary lithosphere?
calcium-rich iron-poor evidence extrasolar planetary lithosphere
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2011/10/8
The presence of elements heavier than helium in white dwarf atmospheres is often a signpost for the existence of rocky objects that currently or previously orbited these stars. We have measured the ab...
Center-to-Limb Variation of Radio Emissions from Thermal-Rich and Thermal-Poor Solar Flares
acceleration of particles—Sun: fl ares—Sun: magnetic fi elds—Sun:radio radiation—Sun: X-rays, gamma rays
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2011/9/30
A statistical analysis of radio flare events was performed by using the event list of Nobeyama Radioheliograph in 1996-2009. We examined center-to-limb variations of 17GHz and 34GHz flux by dividing t...
A holistic abundance analysis of r-rich stars
holistic abundance analysis r-rich stars
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2011/1/10
The chemical abundances of metal-poor stars are an excellent test bed by which to set new constraints on models of neutron-capture processes at low metallicity. Some r-process-rich (hereafter r-rich) ...
Clouds Toward the Virgo Cluster Periphery: Gas-rich Optically Inert Galaxies
Clouds Toward Virgo Cluster Periphery
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2011/1/13
Aperture synthesis observations of two HI cloud complexes located in the periphery of the Virgo galaxy cluster are presented. These low HI-mass clouds ($M_{HI}<$ 10$^{9}$) are seen projected on the M ...
Whole Earth Telescope Observations of the subdwarf B star KPD 1930+2752: A rich, short period pulsator in a close binary
stars general — oscillations individual(KPD1930+2752)
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2010/11/9
KPD 1930+2752 is a short-period pulsating subdwarf B (sdB) star. It is also an ellip-soidal variable with a known binary period just over two hours. The companion is most likely a white dwarf and the ...
A Critical Examination of the X-Wind Model for Chondrule and Calcium-rich, Aluminum-rich Inclusion Formation and Radionuclide Production
Critical Examination Chondrule Calcium-rich Radionuclide Production
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2010/11/16
Meteoritic data, especially regarding chondrules and calcium-rich, aluminumrich inclusions (CAIs), and isotopic evidence for short-lived radionuclides (SLRs)in the solar nebula, potentially can constr...
The RAVE Survey: Rich in Very Metal-Poor Stars
The RAVE Survey Rich Metal-Poor Stars
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2011/1/10
Very metal-poor stars are of obvious importance for many problems in chemical evolution, star formation, and galaxy evolution. Finding complete samples of such stars which are also bright enough to al...
The Super Lithium-Rich Red Giant Rapid Rotator G0928+73.2600: A Case for Planet Accretion?
Solar and Stellar Astrophysics (astro-ph.SR)
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2011/1/5
We present the discovery of a super lithium-rich K giant star, G0928+73.2600. This red giant (T_eff = 4885 K and log g = 2.65) is a fast rotator with a projected rotational velocity of 8.4 km/s and an...
Photochemistry in the inner layers of clumpy circumstellar envelopes: formation of water in C-rich objects and of C-bearing molecules in O-rich objects
Galaxy Astrophysics (astro-ph.GA)
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2010/12/28
A mechanism based on the penetration of interstellar ultraviolet photons into the inner layers of clumpy circumstellar envelopes around AGB stars is proposed to explain the non-equilibrium chemistry o...