Large scale extinction maps with UVIT

Ravichandran, Sathish Kumar; Preethi, K.; Safonova, Margarita; Murthy, Jayant

doi:10.1007/s10509-013-1359-8

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…The GALEX calibration assumed the sources to be spectrally flat, regardless of the actual spectral type. This is obviously an approximation, and a correct calibration should include the spectral type of the source (Ravichandran et al 2013). The slope was used as a scale factor to calculate the predicted UVIT count rate to estimate the effect of non-linearity.…”

Section: Calibration Using Galex Datamentioning

confidence: 99%

Investigating the in-flight performance of the UVIT payload on AstroSat

Rahna

Murthy

Safonova³

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We have studied the performance of the Ultraviolet Imaging Telescope payload on AstroSat and derived a calibration of the FUV and NUV instruments on board. We find that the sensitivity of both the FUV and NUV channels is as expected from ground calibrations, with the FUV effective area about 35% and the NUV effective area about the same as that of GALEX. The point spread function of the instrument is on the order of 1.2 -1.6 . We have found that pixel-to-pixel variations in the sensitivity are less than 10% with spacecraft motion compensating for most of the flat-field variations. We derived a distortion correction but recommend that it be applied post-processing as part of an astrometric solution.

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Section: Calibration Using Galex Datamentioning

confidence: 99%

Investigating the in-flight performance of the UVIT payload on AstroSat

Rahna

Murthy

Safonova³

et al. 2017

Monthly Notices of the Royal Astronomical Society

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“…7 and 8 † GALEX effective wavelength for FUV channel is from Hunter et al (2010). The effective wavelengths for UVIT FUV filters were estimated in Ravichandran et al (2013) probably constitute only ∼1 phots/cm 2 (e.g. Safonova et al 2008).…”

Section: Uv Transients From Celestical Collisionsmentioning

confidence: 99%

Prospect for UV observations from the Moon

Safonova

Mathew

Mohan

et al. 2014

Astrophys Space Sci

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Space astronomy in the last 40 years has largely been done from spacecraft in low Earth orbit (LEO) for which the technology is proven and delivery mechanisms are readily available. However, new opportunities are arising with the surge in commercial aerospace missions. We describe here one such possibility: deploying a small instrument on the Moon. This can be accomplished by flying onboard the Indian entry to the Google Lunar X PRIZE competition, Team Indus mission, which is expected to deliver a nearly 30 kgs of payloads to the Moon, with a rover as its primary payload. We propose to mount a wide-field far-UV (130--180 nm) imaging telescope as a payload on the Team Indus lander. Our baseline operation is a fixed zenith pointing but with the option of a mechanism to allow observations of different attitudes. Pointing towards intermediate ecliptic latitude (50 deg or above) ensures that the Sun is at least 40 deg off the line of sight at all times. In this position, the telescope can cover higher galactic latitudes as well as parts of Galactic plane. The scientific objectives of such a prospective are delineated and discussed.Comment: 28 pages, 8 figure

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Fifty years of X-ray astronomy: A look back and into the (near) future

Santangelo

Madonia

2014

Astroparticle Physics

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Large scale extinction maps with UVIT

Cited by 4 publications

References 9 publications

Investigating the in-flight performance of the UVIT payload on AstroSat

Investigating the in-flight performance of the UVIT payload on AstroSat

Prospect for UV observations from the Moon

Fifty years of X-ray astronomy: A look back and into the (near) future

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