ASTROSAT mission

Singh, K. P.; Tandon, S. N.; Agrawal, P. C.; Antia, H. M.; Manchanda, R. K.; Yadav, J. S.; Seetha, S.; Ramadevi, M. C.; Rao, A. R.; Bhattacharya, Dipankar; Paul, Biswajit; Sreekumar, P.; Bhattacharyya, Sudip; Stewart, G. C.; Hutchings, J. B.; Subramaniam, Annapurni; Ghosh, S. K.; Murthy, Jayant; Pati, A. K.; Rao, N. Kameswara; Stalin, C. S.; Girish, V.; Sankarasubramanian, K.; Vadawale, S.; Bhalerao, V.; Dewangan, G. C.; Dedhia, Dhiraj; Hingar, M. K.; Katoch, Tilak; Kothare, A. T.; Mirza, I.; Mukerjee, K.; Shah, H.; Shah, Priya; Mohan, Rekhesh; Sangal, A. K.; Nagabhusana, S.; Sriram, S.; Malkar, J. P.; Sreekumar, S.; Abbey, A. F.; Hansford, G. M.; Beardmore, A. P.; Sharma, Monika; Murthy, S Nataraja; Kulkarni, Rachana; Meena, G. S.; Babu, V. C.; Postma, J.

doi:10.1117/12.2062667

Cited by 176 publications

(55 citation statements)

References 13 publications

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“…The Soft X-ray Telescope (SXT) is a focusing X-ray telescope with CCD in the focal plane that can perform X-ray imaging and spectroscopy in the 0.3-7 keV energy range (Singh et al 2014(Singh et al , 2016Singh et al 2017). SAX J1748.9-2021 was observed in the Photon Counting (PC) mode with SXT (Table 1).…”

Section: Astrosat/sxtmentioning

confidence: 99%

“…India's first dedicated multi-wavelength astronomy satellite, AstroSat (Agrawal 2006;Singh et al 2014), was launched in 2015. It has five principal payloads on-board: (i) the Soft X-ray Telescope (SXT), (ii) the Large Area Xray Proportional Counters (LAXPCs), (iii) the Cadmium-Zinc-Telluride Imager (CZTI), (iv) the Ultra-Violet Imaging Telescope (UVIT), and (v) the Scanning Sky Monitor (SSM).…”

Section: Introductionmentioning

confidence: 99%

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A broad-band look of the accreting millisecond X-ray pulsar SAX J1748.9−2021 using AstroSat and XMM–Newton

Sharma

Beri

Sanna

et al. 2020

Monthly Notices of the Royal Astronomical Society

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SAX J1748.9-2021 is a transient accretion powered millisecond X-ray pulsar located in the Globular cluster NGC 6440. We report on the spectral and timing analysis of SAX J1748.9-2021 performed on AstroSat data taken during its faint and short outburst of 2017. We derived the best-fitting orbital solution for the 2017 outburst and obtained an average local spin frequency of 442.361098(3) Hz. The pulse profile obtained from 3-7 keV and 7-20 keV energy bands suggest constant fractional amplitude ∼ 0.5% for fundamental component, contrary to previously observed energy pulse profile dependence. Our AstroSat observations revealed the source to be in a hard spectral state. The 1-50 keV spectrum from SXT and LAXPC on-board AstroSat can be well described with a single temperature blackbody and thermal Comptonization. Moreover, we found that the combined spectra from XMM-Newton (EPIC-PN) and AstroSat (SXT+LAXPC) indicated the presence of reflection features in the form of iron (Fe Kα) line that we modeled with the reflection model xillvercp. One of the two X-ray burst observed during the AstroSat/LAXPC observation showed hard Xray emission (>30 keV) due to Compton up-scattering of thermal photons by the hot corona. Time resolved analysis performed on the bursts revealed complex evolution in emission radius of blackbody for second burst suggestive of mild photospheric radius expansion.

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Section: Astrosat/sxtmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A broad-band look of the accreting millisecond X-ray pulsar SAX J1748.9−2021 using AstroSat and XMM–Newton

Sharma

Beri

Sanna

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…THE prime emphasis of the AstroSat satellite is the X-ray timing instrument Large Area X-ray Proportional Counter (LAXPC) coupled with a sensitive wide-field Ultraviolet Imaging Telescope (UVIT) 1 . The LAXPC instrument is expected to extend the rich legacy of X-ray timing measurement pioneered by the Rossi X-ray Timing Explorer (RXTE) in an improved manner due to the phenomenally large effective area in the hard X-ray (20-80 keV) band.…”

Section: Introductionmentioning

confidence: 99%

Cadmium-Zinc-Telluride Imager On-Board Astrosat:A Multi-Faceted Hard X-Ray Instrument

Rao¹,

Bhattacharya²,

Bhalerao³

et al. 2017

Current Science

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The AstroSat satellite is designed to make multiwaveband observations of astronomical sources and the Cadmium-Zinc-Telluride Imager (CZTI) instrument of AstroSat covers the hard X-ray band. CZTI has a large area position-sensitive hard X-ray detector equipped with a coded aperture mask, thus enabling simultaneous background measurements. Ability to record simultaneous detection of ionizing interactions in multiple detector elements is a special feature of the instrument, and this is exploited to provide polarization information in the 100-380 keV region. CZTI provides sensitive spectroscopic measurements in the 20-100 keV region, and acts as an all-sky hard X-ray monitor and polarimeter above 100 keV. During the first year of operation, CZTI has recorded several gamma-ray bursts, measured the phase-resolved hard X-ray polarization of the Crab pulsar, and the hard X-ray spectra of many bright galactic X-ray binaries. The excellent timing capability of the instrument has been demonstrated with simultaneous observation of the Crab pulsar with radio telescopes like Gaint Metrewave Radio Telescope and Ooty Radio Telescope.

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“…1). It was activated a few days after the launch in a sequence of operations culminating in the opening of its camera door on 26 October 2015, thus making its first observation of a cosmic X-ray source.…”

Section: Introductionmentioning

confidence: 99%

Soft X-Ray Focusing Telescope Aboard Astrosat:Early Results

Singh¹,

Dewangan²,

Chandra³

et al. 2017

Current Science

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The Soft X-ray focusing Telescope (SXT) is a moderateresolution X-ray imaging spectrometer supplementing the ultraviolet and hard X-ray payloads for broadband studies of cosmic sources with AstroSat. Well suited for observing bright X-ray sources, SXT observations of nearby active galactic nuclei (AGN), binary star systems with compact companions, active stars, etc. are producing long soft X-ray light curves and high-quality spectra. The strong X-ray variability and multiple spectral components exhibited by SXT observations of nearby Seyfert 1 galaxies show excellent promise to probe accretion disks and central engines in AGN through multi-band variability and spectroscopy.

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ASTROSAT mission

Cited by 176 publications

References 13 publications

A broad-band look of the accreting millisecond X-ray pulsar SAX J1748.9−2021 using AstroSat and XMM–Newton

A broad-band look of the accreting millisecond X-ray pulsar SAX J1748.9−2021 using AstroSat and XMM–Newton

Cadmium-Zinc-Telluride Imager On-Board Astrosat:A Multi-Faceted Hard X-Ray Instrument

Soft X-Ray Focusing Telescope Aboard Astrosat:Early Results

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