Institution
Smithsonian Astrophysical Observatory
Facility•Cambridge, Massachusetts, United States•
About: Smithsonian Astrophysical Observatory is a facility organization based out in Cambridge, Massachusetts, United States. It is known for research contribution in the topics: Galaxy & Stars. The organization has 1665 authors who have published 3622 publications receiving 132183 citations. The organization is also known as: SAO.
Topics: Galaxy, Stars, Telescope, Luminosity, Star formation
Papers published on a yearly basis
Papers
More filters
••
TL;DR: In this paper, the authors measured the strength, frequency, and timescale of triggered star formation at redshift z=0.08-0.38 in a spectroscopically complete sample of galaxy pairs drawn from the magnitude limited redshift survey of 9,825 Smithsonian Hectospec Lensing Survey (SHELS) galaxies with R 1/5) pair galaxies with $M_R < -20.
Abstract: We measure the strength, frequency, and timescale of tidally triggered star formation at redshift z=0.08-0.38 in a spectroscopically complete sample of galaxy pairs drawn from the magnitude-limited redshift survey of 9,825 Smithsonian Hectospec Lensing Survey (SHELS) galaxies with R 1/5) pair galaxies with $M_R < -20.8 in the redshift range z=0.08-0.31. The size and completeness of the spectroscopic survey allows us to focus on regions of low local density. The spectrophotometric calibration enables the use of the 4000 Ang break (D_n4000), the H\alpha specific star formation rate (SSFR_{H\alpha}), and population models to characterize the galaxies. We show that D_n4000 is a useful population classification tool; it closely tracks the identification of emission line galaxies. The sample of major pair galaxies in regions of low local density with low D_n4000 demonstrates the expected anti-correlation between pair-wise projected separation and a set of star formation indicators explored in previous studies. We measure the frequency of triggered star formation by comparing the SSFR_{H\alpha} in the volume-limited sample in regions of low local density: 32 +/-7% of the major pair galaxies have SSFR_{H\alpha} at least double the median rate of the unpaired field galaxies. Comparison of stellar population models for pair and for unpaired field galaxies implies a timescale for triggered star formation of ~300-400 Myr.
57 citations
••
University of California, Los Angeles1, Serco Group2, INAF3, University of Toulouse4, University of California, Berkeley5, University of Michigan6, Smithsonian Astrophysical Observatory7, University of Orléans8, University of Minnesota9, Goddard Space Flight Center10, University of Colorado Boulder11
57 citations
••
TL;DR: In this paper, the authors presented maps of over 1.5 deg2 in Chamaeleon (Cha) II at 24, 70, and 160 μm observed with the Spitzer Space Telescope Multiband Imaging Photometer for Spitzer (MIPS) and a 1.2 deg2 millimeter map from SIMBA on the Swedish-ESO Submillimetre Telescope (SEST).
Abstract: We present maps of over 1.5 deg2 in Chamaeleon (Cha) II at 24, 70, and 160 μm observed with the Spitzer Space Telescope Multiband Imaging Photometer for Spitzer (MIPS) and a 1.2 deg2 millimeter map from SIMBA on the Swedish-ESO Submillimetre Telescope (SEST). The c2d Spitzer Legacy Team's data reduction pipeline is described in detail. Over 1500 24 μm sources and 41 70 μm sources were detected by MIPS with fluxes greater than 10 σ. More than 40 potential YSOs are identified with a MIPS and 2MASS color-color diagram and by their spectral indices, including two previously unknown sources with 24 μm excesses. Our new SIMBA millimeter map of Cha II shows that only a small fraction of the gas is in compact structures with high column densities. The extended emission seen by MIPS is compared with previous CO observations. Some selected interesting sources, including two detected at 1 mm, associated with Cha II are discussed in detail, and their SEDs are presented. The classification of these sources using MIPS data is found to be consistent with that of previous studies.
57 citations
••
TL;DR: In this paper, the authors studied the composition and rheology of the mantle beneath the Red Sea rift margins. And they found that the abundance of plagioclase-bearing assemblages may be related to a relatively shallow upper mantle which extends up into stability fields for plagi-closescale-bearing pyroxenite and peridotite.
57 citations
••
TL;DR: A dramatic ionospheric phenomenon, unique in magnitude and in spatial and temporal extent, occurred along the Atlantic Coast of North America after the launch of the NASA Skylab Workshop on 14 May 1973.
Abstract: A dramatic ionospheric phenomenon, unique in magnitude and in spatial and temporal extent, occurred along the Atlantic Coast of North America after the launch of the NASA Skylab Workshop on 14 May 1973. The effect was a large and rapid decrease in the total number of ionospheric electrons within a distance of 1000 kilometers of the burning engines of the Saturn V launch vehicle. The observations are interpreted in terms of exceptionally enhanced chemical loss rates due to the molecular hydrogen and water vapor contained in the Saturn second-stage exhaust plume.
57 citations
Authors
Showing all 1666 results
Name | H-index | Papers | Citations |
---|---|---|---|
Lee Hartmann | 134 | 579 | 57649 |
David W. Latham | 127 | 852 | 67390 |
Chi Lin | 125 | 1313 | 102710 |
William R. Forman | 120 | 800 | 53717 |
Edo Berger | 118 | 578 | 47147 |
Joseph Silk | 108 | 1317 | 58146 |
Jon M. Miller | 107 | 706 | 50126 |
Fabrizio Fiore | 106 | 804 | 43260 |
Randall V. Martin | 105 | 396 | 57917 |
Christopher F. McKee | 103 | 368 | 44919 |
John P. Hughes | 101 | 616 | 36396 |
Wallace L. W. Sargent | 99 | 397 | 30265 |
Bryan Gaensler | 99 | 844 | 39851 |
Alexey Vikhlinin | 99 | 367 | 35822 |
Matthew J. Holman | 99 | 320 | 46577 |