Advertisement

Study of X-ray transients with Scanning Sky Monitor (SSM) onboard AstroSat

  • M. C. Ramadevi
  • B. T. Ravishankar
  • Abhilash R. Sarwade
  • S. Vaishali
  • Nirmal Kumar Iyer
  • Anuj Nandi
  • V. Girish
  • Vivek Kumar Agarwal
  • Blessy Elizabeth Baby
  • Mohammed Hasan
  • S. Seetha
  • Dipankar Bhattacharya
Review

Abstract

Scanning Sky Monitor (SSM) onboard AstroSat is an X-ray sky monitor in the energy range 2.5–10 keV. SSM scans the sky for X-ray transient sources in this energy range of interest. If an X-ray transient source is detected in outburst by SSM, the information will be provided to the astronomical community for follow-up observations to do a detailed study of the source in various other bands. SSM instrument, since its power-ON in orbit, has observed a number of X-ray sources. This paper discusses observations of few X-ray transients by SSM. The flux reported by SSM for few sources during its Performance Verification phase (PV phase) is studied and the results are discussed.

Keywords

X-ray sky monitor scanning sky monitor one-dimensional coded mask 1D position sensitive proportional counter AstroSat X-ray transients 

Notes

Acknowledgements

SSM team would like to acknowledge the Director, ISAC, Deputy Director, SAG, ISAC and Group Director, SAG, ISAC for constant support and for the successful launch of AstroSat followed by successful operation of SSM onboard. The team also acknowledges various entities including SMG, CSG and others at ISAC and also CMSE, VSSC, who have contributed their part in making of the payload and successful completion of various processes and procedures towards delivery of the payload. SSM team also acknowledges all the members of SAG and other groups at ISAC who have contributed to the development of this successful payload.

References

  1. Agrawal P. C. 2006, A broad spectral band Indian Astronomy satellite AstroSat, Adv. Space Res., 38, 2989ADSCrossRefGoogle Scholar
  2. Agrawal P. C. 2017, AstroSat: From Inception to Realization and Launch, J. Astrophys. Astr., 38, 27,  https://doi.org/10.1007/s12036-017-9449-6 ADSCrossRefGoogle Scholar
  3. Bhattacharya D., Ravishankar B. T. 2002, Imaging with the Scanning Sky Monitor on AstroSat, BASI, 30, 833Google Scholar
  4. Dincer T., Bailyn Charles D., Cruz B. 2017, Outburst behaviour in Aql X-1, Astronomer’s Telegram ATel #10450Google Scholar
  5. Levine A. M., Bradt H., Cui W., Jernigan J. G., Morgan E. H., Remillard R., Shirey R. E., Smith, D. A. 1996, First Results from the All-Sky Monitor on the Rossi X-ray Timing Explorer, ApJ, 469, L33ADSCrossRefGoogle Scholar
  6. Matsuoka M., Kawasaki K., Ueno S., Tomida H., Kohama M., Suzuki M., Adachi Y., Ishikawa M., Mihara T., Sugizaki M. et. al. 2009, The MAXI Mission on the ISS: Science and Instruments for Monitoring All-Sky X-ray Images, PASJ, 61, 999ADSCrossRefGoogle Scholar
  7. Ramadevi M. C. et. al. 2017a, Scanning Sky Monitor (SSM) on-board AstroSat, Experimental Astronomy,  https://doi.org/10.1007/s10686-017-9536-3
  8. Ramadevi M. C. et. al. 2017b, Early in-orbit performance of Scanning Sky Monitor onboard AstroSat, J. Astrophys. Astr., 38, 32,  https://doi.org/10.1007/s12036-017-9454-9
  9. Ramadevi M. C., Ravishankar B. T., Sarwade A. R., Vaishali S., Hasan M., Agarwal V. K., Bhattacharya D., Seetha S., Agarwal A. 2017c, SSM on AstroSat detects neutron star X-ray transient Aql X-1 in its outburst, Astronomer’s Telegram ATel #10452Google Scholar
  10. Ramadevi M. C., Ravishankar B. T., Nandi A., Girish V., Singh B., Jain A., Agrawal V. A., Agarwal A., Bhattacharya D., Seetha S. et. al. 2015, Detection of beta-class variability in Black Hole source GRS 1915+105 by AstroSat Scanning Sky Monitor, Astronomer’s Telegram ATel #8185Google Scholar
  11. Ramadevi M. C., Seetha S. 2011a, Spectral calibration of scanning sky monitor on AstroSat, Experimental Astronomy, 31(2–3), 83ADSCrossRefGoogle Scholar
  12. Ramadevi M. C., Ravishankar B. T., Seetha S. 2011b, Position calibration methodology for scanning sky monitor for AstroSat, Experimental Astronomy, 31(2–3), 99ADSCrossRefGoogle Scholar
  13. Ramadevi M. C., Seetha S., Babu V. C., Ashoka B. N., Sreekumar P. 2006, Optimization of Gas Proportional Counters for Scanning Sky Monitor (SSM) onboard AstroSat, Advances in Space Research, 38, 3002ADSCrossRefGoogle Scholar
  14. Ravishankar B. T., Bhattacharya D. 2003, Image Reconstruction for a Continuously Rotating Coded Mask Camera, BASI, 31, 491ADSGoogle Scholar
  15. Seetha S., Ramadevi M. C., Babu V. C., Sharma M. R., Murthy N. S. R., Ashoka B. N., Shyama K. C., Kulkarni R., Meena G., Sreekumar P. 2006, The Scanning Sky Monitor (SSM) on AstroSat, Advances in Space Research, 38, 2995ADSCrossRefGoogle Scholar
  16. 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 D. et. al. 2014, AstroSat Mission, Proc. of SPIE 2014, 91442T, 9144-100,  https://doi.org/10.1117/12.2062667 Google Scholar

Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  • M. C. Ramadevi
    • 1
  • B. T. Ravishankar
    • 1
  • Abhilash R. Sarwade
    • 1
  • S. Vaishali
    • 1
  • Nirmal Kumar Iyer
    • 1
  • Anuj Nandi
    • 1
  • V. Girish
    • 1
  • Vivek Kumar Agarwal
    • 1
  • Blessy Elizabeth Baby
    • 1
  • Mohammed Hasan
    • 1
  • S. Seetha
    • 2
  • Dipankar Bhattacharya
    • 3
  1. 1.Space Astronomy GroupISRO Satellite CentreBangaloreIndia
  2. 2.ISRO HeadquartersBangaloreIndia
  3. 3.Inter University Centre for Astronomy and AstrophysicsPuneIndia

Personalised recommendations