scispace - formally typeset
Search or ask a question
Institution

European Southern Observatory

FacilityGarching bei München, Germany
About: European Southern Observatory is a facility organization based out in Garching bei München, Germany. It is known for research contribution in the topics: Galaxy & Stars. The organization has 3594 authors who have published 16157 publications receiving 823095 citations. The organization is also known as: The European Southern Observatory,ESO & ESO.
Topics: Galaxy, Stars, Star formation, Redshift, Population


Papers
More filters
Journal ArticleDOI
TL;DR: The Bright SHARC Survey as discussed by the authors was the first large-scale survey of high-Redshift archived ROSAT pointings and has yielded 374 extended sources with a redshift range from 0.0696 to 0.83 and a luminosity range of 0.5-2.0 keV.
Abstract: We present the Bright SHARC (Serendipitous High-Redshift Archival ROSAT Cluster) Survey, which is an objective search for serendipitously detected extended X-ray sources in 460 deep ROSAT PSPC pointings. The Bright SHARC Survey covers an area of 178.6 deg2 and has yielded 374 extended sources. We discuss the X-ray data reduction, the candidate selection and present results from our on-going optical follow-up campaign. The optical follow-up concentrates on the brightest 94 of the 374 extended sources and is now 97% complete. We have identified 37 clusters of galaxies, for which we present redshifts and luminosities. The clusters span a redshift range of 0.0696< z < 0.83 and a luminosity range of 0.065< LX< 8.31044 ergs s-1 [0.5-2.0 keV] (assuming H0=50 km s-1 Mpc-1 and q0=0.5). Twelve of the clusters have redshifts greater than z=0.3, eight of which are at luminosities brighter than LX=31044 ergs s-1. Seventeen of the 37 optically confirmed Bright SHARC clusters have not been listed in any previously published catalog. We also report the discovery of three candidate ``fossil groups'' of the kind proposed by Ponman et al. Based on data taken at the European Southern Observatory, Kitt Peak National Observatory, Cerro Tololo Inter-American Observatory, Canada-France-Hawaii, and Apache Point Observatory.

171 citations

Journal ArticleDOI
TL;DR: In this paper, Russian Science Foundation and National Aeronautics and Space Administration (NAOJ ALMA Scientific Research Grant) were used for the development of the ALMA project.
Abstract: Russian Science Foundation 17-12-01168 Jet Propulsion Laboratory, California Institute of Technology National Aeronautics and Space Administration NAOJ ALMA Scientific Research Grant 2016-02A

171 citations

Journal ArticleDOI
TL;DR: The Combined Array for Research in Millimeter Astronomy (CARMA) ATLAS^(3D) molecular gas imaging survey is complete to a CO(1−0) integrated flux of 185 Jy km/s^(−1),^1 and represents the largest, best studied sample of its type to date as mentioned in this paper.
Abstract: We present the Combined Array for Research in Millimeter Astronomy (CARMA) ATLAS^(3D) molecular gas imaging survey, a systematic study of the distribution and kinematics of molecular gas in CO-rich early-type galaxies Our full sample of 40 galaxies (30 newly mapped and 10 taken from the literature) is complete to a ^(12)CO(1–0) integrated flux of 185 Jy km s^(−1),^1 and it represents the largest, best studied sample of its type to date A comparison of the CO distribution of each galaxy to the g − r colour image (representing dust) shows that the molecular gas and dust distributions are in good agreement and trace the same underlying interstellar medium The galaxies exhibit a variety of CO morphologies, including discs (50 per cent), rings (15 per cent), bars+rings (10 per cent), spiral arms (5 per cent) and mildly (125 per cent) and strongly (75 per cent) disrupted morphologies There appear to be weak trends between galaxy mass and CO morphology, whereby the most massive galaxies in the sample tend to have molecular gas in a disc morphology We derive a lower limit to the total accreted molecular gas mass across the sample of 248 × 10^(10) M_⊙, or approximately 83 × 10^8 M_⊙ per minor merger within the sample, consistent with minor merger stellar mass ratios

171 citations

Journal ArticleDOI
TL;DR: In this article, the authors presented the Hubble Space Telescope Advanced Camera for Surveys multicolor coronagraphic images of the recently discovered edge-on debris disk around the nearby M dwarf AU Microscopii, which is seen between r ¼ 0B75 and 15 00 (7.5-150 AU) from the star.
Abstract: We present Hubble Space Telescope Advanced Camera for Surveys multicolor coronagraphic images of the recently discovered edge-on debris disk around the nearby (� 10 pc) M dwarf AU Microscopii. The disk is seen between r ¼ 0B75 and 15 00 (7.5–150 AU) from the star. It has a thin midplane with a projected FWHM thickness of 2.5–3.5 AU within r < 50 AU of the star that increases to 6.5–9 AU at r � 75 AU. The disk’s radial brightness profile is generally flat forr < 15 AU, then decreases gradually (I / r � 1:8 )o ut tor � 43 AU, beyond which it falls rapidly (I / r � 4:7 ). Within 50 AU the midplane is straight and aligned with the star, and beyond that it deviates by � 3 � , resulting in a bowed appearance that was also seen in ground-based images. Three-dimensional modeling of the disk shows that the inner region (r < 50 AU) is inclined to the line of sight by less than 1 � and the outer disk by � 3 � . The inclination of the outer disk and moderate forward scattering (g � 0:4) can explain the apparentbow. The intrinsic, deprojected FWHM thickness is 1.5–10 AU, increasing with radius. The models indicate that the disk is clear of dust within � 12 AU of the star, in general agreement with the previous prediction of 17 AU based on the infrared spectral energy distribution. The disk is blue, being 60% brighter at B than I relative to the star. One possible explanation for this is that there is a surplus of very small grains compared with other imaged debris disks that have more neutral or red colors. This may be due to the low radiation pressure exerted by the late-type star. Observations at two epochs show that an extended source seen along the midplane is a background galaxy.

170 citations

Journal ArticleDOI
TL;DR: In this paper, the age of the globular cluster NGC 6752 has been estimated using the deep Hubble Space Telescope (HST) observations with WFPC2 of the cluster white dwarfs.
Abstract: Deep Hubble Space Telescope (HST) observations with WFPC2 of the nearby globular cluster NGC 6752 have allowed us to obtain accurate photometry for the cluster white dwarfs (WDs). A sample of local WDs of known trigonometric parallax and mass close to that of the cluster WDs have also been observed with WFPC2. Matching the cluster and the local WD sequences provides a direct measure of the distance to the cluster: (m - M)0 = 13.05, with an uncertainty less than ±0.1 mag, which allows a substantial reduction in the uncertainty in the age of the cluster. Indeed, coupling this value of the cluster distance to the cluster metallicity, helium abundance, and α-element enhancement [α/Fe] = 0.5 yields an age of 15.5 and 14.5 Gyr using evolutionary models that do not include or do include helium diffusion, respectively. The uncertainty affecting these age determinations is ~10%. The majority of the cluster WDs appear to be of the DA variety, while the color-magnitude location of two WDs is consistent with the DB type. This suggests a cluster DB/DA ratio similar to that of WDs in the solar neighborhood.

170 citations


Authors

Showing all 3617 results

NameH-indexPapersCitations
Robert C. Nichol187851162994
Richard S. Ellis169882136011
Rob Ivison1661161102314
Alvio Renzini16290895452
Timothy C. Beers156934102581
Krzysztof M. Gorski132380105912
Emanuele Daddi12958163187
P. R. Christensen12731388445
Mark Dickinson12438966770
Christopher W. Stubbs122622109429
Eva K. Grebel11886383915
Martin Asplund11861252527
Jesper Sollerman11872653436
E. F. van Dishoeck11574249190
Jørgen Christensen-Dalsgaard11458548272
Network Information
Related Institutions (5)
INAF
30.8K papers, 1.2M citations

98% related

Space Telescope Science Institute
14.1K papers, 947.2K citations

96% related

National Radio Astronomy Observatory
8.1K papers, 431.1K citations

95% related

Kapteyn Astronomical Institute
3.5K papers, 180.9K citations

95% related

Institut d'Astrophysique de Paris
7.6K papers, 491.5K citations

94% related

Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20233
202231
2021557
2020920
2019759
2018941