Showing 2000 · astro-phShow all

75 papers · 2 filters

astro-ph2000★ 6 cited

Emission line imaging of QSOs with high resolution

J. B. Hutchings, S. L. Morris, D. Crampton

We report the first detection of emission line gas within the host galaxies of high redshift QSOs. This was done using narrow-band imaging at the redshifted wavelengths of [O III]…

astro-ph2000★ 88 cited

Weak lensing study of low mass galaxy groups: implications for Omega_m

H. Hoekstra, M. Franx, K. Kuijken +8

We report on the first measurement of the average mass and mass-to-light ratio of galaxy groups by analysing the weak lensing signal induced by these systems. The groups, which hav…

astro-ph2000★ 16 cited

On the Hidden Nuclear Starburst in Arp 220

Yasuhiro Shioya, Neil Trentham, Yoshiaki Taniguchi

We construct a starburst model for the hidden starbursts in Arp 220 based on the new Starburst99 models of Leitherer et al. Comparing these stellar population synthesis models with…

astro-ph2000★ 5 cited

The brightness of SN 1991T and the uniformity of decline-rate and colour corrected absolute magnitudes of supernovae Ia

T. Richtler, J. B. Jensen, J. Tonry +2

We present a distance to NGC 4527, the host galaxy of the type Ia SN 1991T, measured by surface brightness fluctuations. This supernova has been labelled ``peculiar'' both on the g…

astro-ph2000★ 42 cited

The Metallicity of 0.5<z<1 Field Galaxies

C. M. Carollo, S. J. Lilly

We have measured the emission line ratios in a sample of 34 CFRS star-forming galaxies with redshifts between 0.5 < z < 1.0, and computed their metallicities by means of the empiri…

astro-ph2000★ 64 cited

The Infrared Surface Brightness Fluctuation Hubble Constant

Joseph B. Jensen, John L. Tonry, Rodger I. Thompson +5

We measured infrared surface brightness fluctuation (SBF) distances to an isotropically-distributed sample of 16 distant galaxies with redshifts reaching 10,000 km/s using the near…

astro-ph2000★ 1.3k cited

The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances

John L. Tonry, Alan Dressler, John P. Blakeslee +5

We report data for band Surface Brightness Fluctuation (SBF) magnitudes, V-I colors, and distance moduli for 300 galaxies. The Survey contains E, S0 and early-type spiral galax…

astro-ph2000★ 83 cited

From the Top to the Bottom of the Main Sequence: A Complete Mass Function of the Young Open Cluster M35

D. Barrado y Navascués, John R. Stauffer, Jerome Bouvier +1

We present very deep and accurate photometry of the open cluster M35 (VRIc filters). We have covered a region of 27.5x27.5 square arcmin. The data range from Ic=12.5 to 23.5 mag, a…

astro-ph2000★ 41 cited

Where is the [O III]4363 emitting region in active galactic nuclei?

Tohru Nagao, Takashi Murayama, Yoshiaki Taniguchi

The emission-line flux ratio of [O III]4363/[O III]5007 (R_OIII)is a useful diagnostic for the ionization mechanism and physical properties of emission-line regions in active galac…

astro-ph2000★ 2 cited

LRG J0239-0134: A Ring Galaxy or a Pair of Superbubbles at z=1 ?

Yoshiaki Taniguchi, Takashi Murayama

The unusual morphology of LRG J02390134 at =1.062 has been interpreted as a ring galaxy. Here we propose an alternative idea that the ring-like morphology is attributed to a…

astro-ph2000★ 74 cited

The nature of the bright submillimeter galaxy population: a radio pre-selected sample with I>25

S. C. Chapman, E. Richards, G. Lewis +2

Deep submillimetre surveys have successfully detected distant, star-forming galaxies, enshrouded in vast quantities of dust and which emit most of their energy at far infrared wave…

astro-ph2000★ 68 cited

An ionizing UV background dominated by massive stars

Martin G. Haehnelt, Piero Madau, Rolf P. Kudritzki +1

We discuss implications of a stellar-dominated UV background at high redshifts. The composite spectrum of 29 LBGs evaluated by Steidel etal (2000) at <z>=3.4 can be well fit by a s…

astro-ph2000★ 70 cited

Radial and Transverse Velocities of Nearby Galaxies

P. J. E. Peebles, S. D. Phelps, Edward. J. Shaya +1

Analysis of the peculiar velocities of galaxies should take account of the uncertainties in both redshifts and distances. We show how this can be done by a numerical application of…

astro-ph2000★ 36 cited

A Search for Jovian Planets around Hot White Dwarfs

Y. -H. Chu, B. C. Dunne, R. A. Gruendl +1

Current searches for extrasolar planets have concentrated on observing the reflex Doppler shift of solar-type stars. Little is known, however, about planetary systems around non-so…

astro-ph2000★ 4 cited

Detection of arcs in Saturn's F ring during the 1995 Sun ring-plane crossing

S. Charnoz, A. Brahic, C. Ferrari +3

Observations of the November 1995 Sun crossing of the Saturn's ring-plane made with the 3.6m CFH telescope, using the UHAO adaptive optics system, are presented here. We report the…

astro-ph2000★ 8 cited

Probing the Substellar Regime with SIRTF

Eduardo L. Martin, Wolfgang Brandner, David Jewitt +4

One of the main scientific drivers of the Space InfraRed Telescope Facility (SIRTF) is the search for brown dwarfs and extrasolar superplanets. We discuss observational strategies…

astro-ph2000★ 16 cited

The Peak Brightness and Spatial Distribution of AGB Stars Near the Nucleus of M32

T. J. Davidge, F. Rigaut, M. Chun +4

The bright stellar content near the center of the Local Group elliptical galaxy M32 is investigated with 0.12 arcsec FWHM H and K images obtained with the Gemini Mauna Kea telescop…

astro-ph2000★ 59 cited

NICMOS Coronagraphic Observations of 55 Cancri

G. Schneider, E. E. Becklin, B. A. Smith +3

We present new near-infrared (1.1-micron) observations of the circumstellar environment of the planet-bearing star 55 Cancri. With these Hubble Space Telescope images we are unable…

astro-ph2000★ 244 cited

The Evolution of Population Gradients in Galaxy Clusters: the Butcher-Oemler Effect and Cluster Infall

E. Ellingson, H. Lin, H. K. C. Yee +1

We present photometric and spectroscopic measurements of the galaxy populations in clusters from the CNOC1 sample of rich, X-ray luminous clusters at . A classical…

astro-ph2000★ 113 cited

Subaru Deep Survey I. Near-Infrared Observations

T. Maihara, F. Iwamuro, H. Tanabe +30

Deep near-infrared images of a blank 2'x2' section of sky near the Galactic north pole taken by Subaru Telescope are presented. The total integration times of the J and K' bands ar…

astro-ph2000★ 64 cited

Chandra study of an overdensity of X-ray sources around two distant (z~0.5) clusters

M. Cappi, P. Mazzotta, M. Elvis +21

We present results from a Chandra X-ray Observatory study of the field X-ray source populations in 4 different observations: two high-redshift (z~0.5) clusters of galaxies 3C295 an…

astro-ph2000★ 80 cited

Dynamical Constraints on the Formation of NGC 4472 and Its Globular Clusters

Stephen E. Zepf, Michael A. Beasley, Terry J. Bridges +4

We present new radial velocities for 87 globular clusters around the elliptical galaxy NGC 4472, and combine these with our previously published data to create a data set of veloci…

astro-ph2000★ 57 cited

Optical Spectra of Type Ia Supernovae at z=0.46 and z=1.2

Alison L. Coil, Thomas Matheson, Alexei V. Filippenko +19

We present optical spectra, obtained with the Keck 10-m telescope, of two high-redshift type Ia supernovae (SNe Ia) discovered by the High-z Supernova Search Team: SN 1999ff at z=0…

astro-ph2000★ 51 cited

A Wide-Field CCD Survey for Centaurs and Kuiper Belt Objects

S. Sheppard, D. Jewitt, C. Trujillo +2

A modified Baker-Nunn camera was used to conduct a wide-field survey of 1428 square degrees of sky near the ecliptic in search of bright Kuiper Belt objects and Centaurs. This area…