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2621. Proposed Facility
... Over morning tea, some of your more observationally inclined colleagues suggested a way out of this bind: a new space telescope specifically designed to look for very high redshift galaxies, the real `first light in the universe'. The telescope will clearly have to work in the infra-red, but some people at NASA have come up with a clever design whereby a space telescope, equipped with a suitable sun-shield, can be passively cooled down to very low temperatures. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node31.html -- 3.7 Кб -- 02.10.2012
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2622. Research Interests
Next: Proposed Facility Up: You are the Institute Previous: You are the Institute . Your main research interests lie in the very first stars and galaxies to form. Ever since those chaps at Caltech started finding large numbers of galaxies at redshifts up to about 6, the astronomical world has been in a frenzy of theoretical and observational activity. ... You, therefore, have turned your interest where nobody else has dared look: to really high redshifts. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node30.html -- 6.1 Кб -- 02.10.2012
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2623. You are the Institute of Astronomy, Cambridge
. Next: Research Interests Up: Harley Wood Winter School Previous: Proposed Facility . Research Interests . Proposed Facility . Paul Francis . Sun Aug 30 11:56:56 EST 1998
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node29.html -- 2.6 Кб -- 02.10.2012
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2624. Proposed Facility
... So, it seems clear that the high redshift universe, just like the local universe, is full of dust. This dust will mop up all the optical and UV light produced by star-forming galaxies, and re-radiate it in the far-IR. ... This is what SIRTF (the Space InfraRed Telescope Facility) will be. ... It should be able to see normal galaxies, regardless of their dust contents, out to redshifts beyond three, and it will pick up starbursts out to far beyond redshift 5. ... Your answer to them must be DUST! ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node28.html -- 3.6 Кб -- 02.10.2012
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2625. Research Interests
... Your main research interests concern dust. ... One of your main pleasures in life is going to conferences, and asking the question `have you considered dust obscuration?' after every talk by an optical astronomer, and watching their embarrassed evasions. ... Just look at any starburst galaxy: they are the most luminous objects in the local universe, but they are so dusty that the optical astronomers never even noticed them until the infra-red astronomers pointed them out! ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node27.html -- 5.5 Кб -- 02.10.2012
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2626. You are the Imperial College, London
. Next: Research Interests Up: Harley Wood Winter School Previous: Proposed Facility . Research Interests . Proposed Facility . Paul Francis . Sun Aug 30 11:56:56 EST 1998
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node26.html -- 2.6 Кб -- 02.10.2012
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2627. Proposed Facility
... Clearly, what we need is big telescopes with high resolution spectrographs, to get good data on QSO absorption-lines. With bigger and better telescopes, you could measure the clustering and 3D distribution of gas in the early universe, by looking at lots of faint QSOs in the same parts of the sky. ... With the high resolutions made possible by big telescopes, you could look at the internal velocity structure of the absorbing clouds. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node25.html -- 3.9 Кб -- 02.10.2012
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2628. Research Interests
... Your main research interests lie in QSO absorption-line systems. ... The trouble with trying to see galaxies in the early universe is that all you can see will generally be stars. ... Well, most of the universe is made up of dark matter and gas: stars are only a trace impurity, even today. And in the early universe, before most of the stars have formed, stars must be an even less significant component of the universe. It clearly makes far more sense to study the gas in the early universe. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node24.html -- 5.7 Кб -- 02.10.2012
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2629. You are the Institute d'Astrophysique de Paris
. Next: Research Interests Up: Harley Wood Winter School Previous: Proposed Facility . Research Interests . Proposed Facility . Paul Francis . Sun Aug 30 11:56:56 EST 1998
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node23.html -- 2.6 Кб -- 02.10.2012
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2630. Proposed Facility
... Mid-UV spectra of faint QSOs are the way to go, and this means a space mission. Some sort of space telescope: a successor to the HST, with good spectrographs that work in the UV is what you want. With such an instrument you could investigate when and how the intergalactic gas became so hot, how it is distributed, and what it is made of. ... Other useful facilities would include smaller telescopes for finding lots of nice high-redshift QSOs for you to study. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node22.html -- 3.6 Кб -- 02.10.2012
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2631. Research Interests
... Your main research interests lie in the inter-galactic medium. ... It was not: this indicated either that intergalactic space at high redshifts is completely empty (which was very hard to understand theoretically), or that the gas was extraordinarily hot, and hence too higly ionised to absorb at the wavelengths of Ly . ... This would only show up if the inter-galactic medium was indeed very hot: strong absorption was seen, showing that there is a hot medium out there. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node21.html -- 5.6 Кб -- 02.10.2012
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2632. You are the NASA Goddard Space-Flight Center
. Next: Research Interests Up: Harley Wood Winter School Previous: Proposed Facility . Research Interests . Proposed Facility . Paul Francis . Sun Aug 30 11:56:56 EST 1998
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node20.html -- 2.6 Кб -- 02.10.2012
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2633. Proposed Facility
... With current telescopes, finding dusty starbursts in the early universe is hard work. What you really need is a mm-wave telescope with really good resolution and collecting area on a high, dry site. ... Not only could you find high redshift dusty galaxies, but you could use their molecular emission lines to map them, measure their velocity fields, temperatures and chemical compositions. ... It is obvious to you that this is the best way to study the early universe and the formation of galaxies. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node19.html -- 3.4 Кб -- 02.10.2012
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2634. Research Interests
... Your main research interests lie in starburst galaxies. ... Perhaps it is the howling wind and lack of insulation in your offices that does it, but the glowing warmth of a galaxy violently forming vast numbers of stars has a great attraction to you. ... All the nearby galaxies that are forming stars at reasonable rates are very dusty: most of the radiation from their young stars and supernovae is absorbed by dust and re-radiated in the far-IR. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node18.html -- 5.4 Кб -- 02.10.2012
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2635. You are the Royal Observatory, Edinburgh
. Next: Research Interests Up: Harley Wood Winter School Previous: Proposed Facility . Research Interests . Proposed Facility . Paul Francis . Sun Aug 30 11:56:56 EST 1998
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node17.html -- 2.6 Кб -- 02.10.2012
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2636. Proposed Facility
... These computer models are doing very well, but not yet well enough. The problem is dynamic range: any simulation that models a large enough piece of the universe to be representative (a cube of 100 Mpc on a side seems sufficient), cannot have the resolution to accurately follow what happens on galactic scales ( kpc). At present, each point in the n-body code represents around , and you cannot model star formation and galaxy dynamics with only particles. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node16.html -- 4.0 Кб -- 02.10.2012
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2637. Research Interests
... Your main research interests concern the computer modelling of galaxy formation. ... The observers think that they are smart, but it is only thanks to these new telescopes that all the exciting recent progress has been made in the study of the high redshift universe. ... By redshift ten, some knots (where filaments and sheets join) are getting dense enough to form galaxies, and the first light in the universe switches on. ... By redshift 5, clusters of galaxies are centred on these knots. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node15.html -- 6.0 Кб -- 02.10.2012
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2638. You are from The University of Durham
. Next: Research Interests Up: Harley Wood Winter School Previous: Proposed Facility . Research Interests . Proposed Facility . Paul Francis . Sun Aug 30 11:56:56 EST 1998
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node14.html -- 2.6 Кб -- 02.10.2012
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2639. Proposed Facility
... What this work needs is a good space telescope to get high resolution images of these galaxies, and some really big ground-based telescopes equipped with low resolution, multi-object spectrographs, to measure their redshifts. ... Rumor has it that some low individuals, jealous at your great success, are claiming that you have missed most of the galaxies in the early universe: that these galaxies are too red or too dusty for the Ly-limit technique to detect. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node13.html -- 3.3 Кб -- 02.10.2012
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2640. Research Interests
Next: Proposed Facility Up: You are CALTECH Previous: You are CALTECH . Your main research interests lie in Lyman-break galaxies. ... Until a few year ago, almost no galaxies had ever been found in the high redshift universe. ... Galaxies that show up as blue in B and R but are very faint in U will be the ones which have the Ly-limit at around 4000?: ie. redshift 3 galaxies. ... These galaxies (when observed with the Hubble Space telescope) appear as tiny blue specks. ... What are these galaxies? ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/roleplay/html_dir/firstlight/node12.html -- 5.6 Кб -- 02.10.2012
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