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Chandra AD, Karmakar M, Nandy D, Banerjee A. Adaptive hyperspectral imaging using structured illumination in a spatial light modulator-based interferometer. Opt Express 2022; 30:19930-19943. [PMID: 36221756 DOI: 10.1364/oe.459824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 04/04/2022] [Indexed: 06/16/2023]
Abstract
We develop a novel hyperspectral imaging system using structured illumination in an SLM-based Michelson interferometer. In our design, we use a reflective SLM as a mirror in one of the arms of a Michelson interferometer and scan the interferometer by varying the phase across the SLM display. For achieving the latter, we apply a checkerboard phase mask on the SLM display where the gray value varies between 0-255, thereby imparting a dynamic phase of up to 262° to the incident light beam. We couple a supercontinuum source into the interferometer in order to mimic an astronomical object such as the Sun and choose a central wavelength of 637.4 nm akin to the strong emission line of Fe X present in the solar spectrum. We use a bandwidth of 30 nm and extract fringes corresponding to a spectral resolution of 3.8 nm which is limited by the reflectivity of the SLM. We also demonstrate a maximum wavelength tunability of ∼8 nm by varying the phase over the phase mask with a spectral sampling of around 0.03 nm between intermediate fringes. The checkerboard phase mask can be adapted close to real time on time-scales of a few tens of milliseconds to obtain spectral information for other near-contiguous wavelengths. The compactness, potential low cost, low power requirements, real-time tunability and lack of moving mechanical parts in the setup implies that it can have very useful applications in settings that require near real-time, multi-wavelength spectroscopic applications and is especially relevant in space astronomy.
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Mcguire JTW, Tanvir NR, Levan AJ, Trenti M, Stanway ER, Shull JM, Wiersema K, Perley DA, Starling RLC, Bremer M, Stocke JT, Hjorth J, Rhoads JE, Curtis-lake E, Schulze S, Levesque EM, Robertson B, Fynbo JPU, Ellis RS, Fruchter AS. DETECTION OF THREE GAMMA-RAY BURST HOST GALAXIES AT z ∼ 6. ACTA ACUST UNITED AC 2016; 825:135. [DOI: 10.3847/0004-637x/825/2/135] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Nemmen RS, Georganopoulos M, Guiriec S, Meyer ET, Gehrels N, Sambruna RM. A Universal Scaling for the Energetics of Relativistic Jets from Black Hole Systems. Science 2012; 338:1445-8. [PMID: 23239730 DOI: 10.1126/science.1227416] [Citation(s) in RCA: 151] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- R. S. Nemmen
- NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
| | - M. Georganopoulos
- NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
- Department of Physics, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
| | - S. Guiriec
- NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
| | - E. T. Meyer
- Department of Physics and Astronomy, Rice University, Houston, TX 77005, USA
- Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
| | - N. Gehrels
- NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
| | - R. M. Sambruna
- Department of Physics and Astronomy, George Mason University, MS 3F3, 4400 University Drive, Fairfax, VA 22030, USA
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Márka S. Exploring the birth and death of black holes and other creatures. Ann N Y Acad Sci 2012; 1260:55-65. [DOI: 10.1111/j.1749-6632.2011.06414.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Iye M. Subaru studies of the cosmic dawn. Proc Jpn Acad Ser B Phys Biol Sci 2011; 87:575-586. [PMID: 22075759 PMCID: PMC3309921 DOI: 10.2183/pjab.87.575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2011] [Accepted: 09/30/2011] [Indexed: 05/31/2023]
Abstract
An overview on the current status of the census of the early Universe population is given. Observational surveys of high redshift objects provide direct opportunities to study the early epoch of the Universe. The target population included are Lyman Alpha Emitters (LAE), Lyman Break Galaxies (LBG), gravitationally lensed galaxies, quasars and gamma-ray bursts (GRB). The basic properties of these objects and the methods used to study them are reviewed. The present paper highlights the fact that the Subaru Telescope group made significant contributions in this field of science to elucidate the epoch of the cosmic dawn and to improve the understanding of how and when infant galaxies evolve into mature ones.
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Affiliation(s)
- Masanori Iye
- Thirty Meter Telescope Project, National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan.
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Abstract
Gamma-ray bursts are the most powerful objects in the Universe. Discovered in the 1960s as brief flashes of gamma radiation, we now know that they emit across the entire electromagnetic spectrum, are located in distant galaxies and comprise two distinct populations, one of which may originate in the deaths of massive stars. The launch of the Swift satellite in 2004 brought a flurry of new discoveries, advancing our understanding of these sources and the galaxies that host them. I highlight a number of important results from the Swift era thus far.
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Affiliation(s)
- Rhaana L C Starling
- Department of Physics and Astronomy, University of Leicester, Leicester, UK.
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Kodama Y, Yonetoku D, Murakami T, Tanabe S, Tsutsui R, Nakamura T. Gamma-ray bursts in 1.8 < z < 5.6 suggest that the time variation of the dark energy is small. ACTA ACUST UNITED AC 2008. [DOI: 10.1111/j.1745-3933.2008.00508.x] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Salvaterra R, Campana S, Chincarini G, Tagliaferri G, Covino S. On the detection of very high redshift gamma-ray bursts with Swift. ACTA ACUST UNITED AC 2007. [DOI: 10.1111/j.1745-3933.2007.00345.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Abstract
Since its launch on 20 November 2004, the Swift mission has been detecting approximately 100 gamma-ray bursts (GRBs) each year, and immediately (within approx. 90s) starting simultaneous X-ray and UV/optical observations of the afterglow. It has already collected an impressive database, including prompt emission to higher sensitivities than BATSE, uniform monitoring of afterglows and a rapid follow-up by other observatories notified through the GCN. Advances in our understanding of short GRBs have been spectacular. The detection of X-ray afterglows has led to accurate localizations and the conclusion that short GRBs can occur in non-star-forming galaxies or regions, whereas long GRBs are strongly concentrated within the star-forming regions. This is consistent with the NS merger model. Swift has greatly increased the redshift range of GRB detection. The highest redshift GRBs, at z approximately 5-6, are approaching the era of reionization. Ground-based deep optical spectroscopy of high redshift bursts is giving metallicity measurements and other information on the source environment to a much greater distance than other techniques. The localization of GRB 060218 to a nearby galaxy, and the association with SN 2006aj, added a valuable member to the class of GRBs with detected supernova.
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Affiliation(s)
- Neil Gehrels
- NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA.
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Abstract
I review the current status of the use of gamma-ray bursts (GRBs) as probes of the early Universe and cosmology. I describe the promise of long GRBs as probes of the high redshift (z>4) and very high redshift (z>5) Universe, and several key scientific results that have come from observations made possible by accurate, rapid localizations of these bursts by Swift. I then estimate the fraction of long GRBs that lie at very high redshifts and discuss ways in which it may be possible to rapidly identify-and therefore study-a larger number of these bursts. Finally, I discuss the ways in which both long and short GRBs can be made 'standard candles' and used to constrain the properties of dark energy.
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Affiliation(s)
- D Q Lamb
- Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637, USA.
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Wells A, Wijers RAMJ, Rees MJ. Introduction: recent developments in the study of gamma-ray bursts. Philos Trans A Math Phys Eng Sci 2007; 365:1111-8. [PMID: 17293313 DOI: 10.1098/rsta.2006.2000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Gamma-ray bursts (GRBs) are immensely powerful explosions, originating at cosmological distances, whose outbursts persist for durations ranging from milliseconds to tens of seconds or more. In these brief moments, the explosions radiate more energy than the Sun will release in its entire 10Gyr lifetime. Current theories attribute these phenomena to the final collapse of a massive star, or the coalescence of a binary system induced by gravity wave emission. New results from Swift and related programmes offer fresh understanding of the physics of GRBs, and of the local environments and host galaxies of burst progenitors. Bursts found at very high red shifts are new tools for exploring the intergalactic medium, the first stars and the earliest stages of galaxy formation. This Royal Society Discussion Meeting has brought together leading figures in the field, together with young researchers and students, to discuss and review the latest results from NASA's Swift Gamma-ray Burst Observatory and elsewhere, and to examine their impact on current understanding of the observed phenomena.
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Affiliation(s)
- Alan Wells
- Space Research Centre, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK.
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Abstract
The extreme luminosity of gamma-ray bursts and their afterglows means they are detectable, in principle, to very high redshifts. Although the redshift distribution of gamma-ray bursts (GRBs) is difficult to determine, due to incompleteness of present samples, we argue that for Swift-detected bursts, the median redshift is between 2.5 and 3, with a few per cent probably at z>6. Thus, GRBs are potentially powerful probes of the era of reionization and the sources responsible for it. Moreover, it seems probable that they can provide constraints on the star-formation history of the Universe and may also help in the determination of the cosmological parameters.
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Affiliation(s)
- Nial R Tanvir
- Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK.
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