Science Archives Publication System

Direct Measurement of the Size of the Large Kuiper Belt Object (50000) Quaoar

DOI: 10.1086/382513 Bibcode: 2004AJ....127.2413B

Brown, Michael E.; Trujillo, Chadwick A.

We imaged the recently discovered bright Kuiper belt object (50000) Quaoar with the Hubble Space Telescope High Resolution Camera to directly determine its size. The point-spread function (PSF) of each of 16 images was carefully measured from a field star 13" from Quaoar, and the expected PSF at the location of Quaoar was convolved with Quaoar's m…

2004 • The Astronomical Journal

eHST 60

Spectral types and masses of white dwarfs in globular clusters

DOI: 10.1051/0004-6361:20035819 Bibcode: 2004A&A...420..515M

Heber, U.; Zoccali, M.; Koester, D. +4 more

White dwarfs in globular clusters offer additional possibilities to determine distances and ages of globular clusters, provided their spectral types and masses are known. We therefore started a project to obtain spectra of white dwarfs in the globular clusters NGC 6397 and NGC 6752. All observed white dwarfs show hydrogen-rich spectra and are ther…

2004 • Astronomy and Astrophysics

eHST 60

A Survey for Water Maser Emission toward Planetary Nebulae: New Detection in IRAS 17347-3139

DOI: 10.1086/380757 Bibcode: 2004ApJ...601..921D

Miranda, Luis F.; Anglada, Guillem; de Gregorio-Monsalvo, Itziar +4 more

We report on a water maser survey toward a sample of 27 planetary nebulae (PNe) using the Robledo de Chavela and Medicina single-dish antennas, as well as the Very Large Array (VLA). Two detections have been obtained: the already known water maser emission in K3-35, and a new cluster of masers in IRAS 17347-3139. This low rate of detections is com…

2004 • The Astrophysical Journal

eHST 59

A Study of Quasar Evolution in the X-Ray Band with the Aid of Gravitational Lensing

DOI: 10.1086/382205 Bibcode: 2004ApJ...605...45D

Eracleous, Michael; Garmire, Gordon P.; Dai, Xinyu +1 more

We present results from a minisurvey of relatively high redshift (1.7<z<4), gravitationally lensed, radio-quiet quasars observed with the Chandra X-Ray Observatory and with XMM-Newton. The lensing magnification effect allows us to search for changes with redshift in quasar spectroscopic and flux variability properties, ranging over 3 orders …

2004 • The Astrophysical Journal

XMM-Newton 59

XMM-Newton observation of the Seyfert 1.8 ESO 113-G010: Discovery of a highly redshifted iron line at 5.4 keV

DOI: 10.1051/0004-6361:20041637 Bibcode: 2004A&A...427..101P

Turner, T. J.; Uttley, P.; Porquet, D. +1 more

We present a spectral analysis of the Seyfert 1.8 ESO 113-G010 observed with XMM-Newton for 4 ks. The spectrum shows a soft excess below 0.7 keV and more interestingly a narrow emission Gaussian line at 5.4 keV (in its rest-frame), most probably originating from a redshifted iron Kα line. No significant line at or above 6.4 keV …

2004 • Astronomy and Astrophysics

XMM-Newton 59

Seismology of the solar atmosphere

DOI: 10.1023/B:SOLA.0000031397.73790.7b Bibcode: 2004SoPh..220..317F

Cacciani, Alessandro; Jefferies, Stuart M.; Finsterle, Wolfgang +4 more

We describe a new instrument for seismically probing the properties of the Sun's lower atmosphere, and present some first results from an observational campaign carried out at the geographic South Pole during the austral summer of 2002/2003. A preliminary analysis of the data (simultaneous, high-cadence observations of the velocity signals from th…

2004 • Solar Physics

SOHO 59

L183 (L134N) Revisited. II. The dust content

DOI: 10.1051/0004-6361:20034087 Bibcode: 2004A&A...417..605P

Miville-Deschênes, M. -A.; Lagache, G.; Pagani, L. +6 more

We present here a complete dust map of L183 (=L134N) with opacities ranging from A_Vb = 3 to 150 mag. Five peaks are identified as being related to known molecular peaks and among these dust peaks two are liable to form stars. The main peak is a prestellar core with a density profile proportional to …

2004 • Astronomy and Astrophysics

ISO 59

Observations and temperatures of Io's Pele Patera from Cassini and Galileo spacecraft images

DOI: 10.1016/j.icarus.2003.10.019 Bibcode: 2004Icar..169...65R

Turtle, Elizabeth P.; Radebaugh, Jani; McEwen, Alfred S. +4 more

Pele has been the most intense high-temperature hotspot on Io to be continuously active during the Galileo monitoring from 1996-2001. A suite of characteristics suggests that Pele is an active lava lake inside a volcanic depression. In 2000-2001, Pele was observed by two spacecraft, Cassini and Galileo. The Cassini observations revealed that Pele …

2004 • Icarus

Cassini 59

Search for spatial variation in the jovian ¹⁵N/ ¹⁴N ratio from Cassini/CIRS observations

DOI: 10.1016/j.icarus.2003.11.011 Bibcode: 2004Icar..172...50F

Nixon, Conor A.; Irwin, Patrick G. J.; Fouchet, Thierry +4 more

We have used the spectra obtained by the Composite Infrared Spectrometer (CIRS) onboard the Cassini spacecraft to search for latitudinal variation in the ¹⁵N/ ¹⁴N ratio on Jupiter. We found no variations statistically significant given the observational and model uncertainties. The absence of latitudinal variations demonstrat…

2004 • Icarus

Cassini 59

Weak Lensing from Space. II. Dark Matter Mapping

DOI: 10.1086/420985 Bibcode: 2004AJ....127.3089M

Refregier, Alexandre; Ellis, Richard; Massey, Richard +8 more

We study the accuracy with which weak-lensing measurements could be made from a future space-based survey, predicting the subsequent precision of three-dimensional dark matter maps, projected two-dimensional dark matter maps, and mass-selected cluster catalogs. As a baseline, we use the instrumental specifications of the SuperNova/Acceleration Pro…

2004 • The Astronomical Journal

eHST 59