Observations of the Crab Nebula with MACE (Major Atmospheric Cherenkov Experiment)

Document detail

ID

oai:arXiv.org:2404.01649

Topic

Astrophysics - High Energy Astroph... High Energy Physics - Experiment

Author

C., Borwankar M., Sharma J., Hariharan K., Venugopal S., Godambe N., Mankuzhyil P., Chandra M., Khurana A., Pathania N., Chouhan K., Dhar V. R., Thubstan S., Norlha Keshavananda D., Sarkar A., Dar Z. V., Kotwal S. S., Godiyal P., Kushwaha C. K., Singh K. P., Das M. A., Tolamatti B., Ghosal K., Chanchalani P., Pandey N., Bhatt S., Bhattcharyya S., Sahayanathan K., Koul M. P., Dorjey N., Dorji R., Chitnis V. K., Tickoo A. C., Rannot R. K, Yadav K.

Year

2024

listing date

4/10/2024

Keywords

cherenkov atmospheric +/- experiment crab nebula gev 0

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Abstract

The Major Atmospheric Cherenkov Experiment (MACE) is a large size (21m) Imaging Atmospheric Cherenkov Telescope (IACT) installed at an altitude of 4270m above sea level at Hanle, Ladakh in northern India.

Here we report the detection of Very High Energy (VHE) gamma-ray emission from Crab Nebula above 80 GeV.

We analysed ~15 hours of data collected at low zenith angle between November 2022 and February 2023.

The energy spectrum is well described by a log-parabola function with a flux of ~(3.46 +/- 0.26stat) x 10-10 TeV-1 cm-2 s-1, at 400 GeV with spectral index of 2.09 +/- 0.06stat and a curvature parameter of 0.08 +/- 0.07stat.

The gamma-rays are detected in an energy range spanning from 80 GeV to ~5 TeV.

The energy resolution improves from ~34% at an analysis energy threshold of 80 GeV to ~21% above 1 TeV.

The daily light curve and the spectral energy distribution obtained for the Crab Nebula is in agreement with previous measurements, considering statistical and systematic uncertainties.

;Comment: Accepted for publication in Astroparticle Physics

C., Borwankar,M., Sharma,J., Hariharan,K., Venugopal,S., Godambe,N., Mankuzhyil,P., Chandra,M., Khurana,A., Pathania,N., Chouhan,K., Dhar V.,R., Thubstan,S., Norlha,Keshavananda,D., Sarkar,A., Dar Z.,V., Kotwal S.,S., Godiyal,P., Kushwaha C.,K., Singh K.,P., Das M.,A., Tolamatti,B., Ghosal,K., Chanchalani,P., Pandey,N., Bhatt,S., Bhattcharyya,S., Sahayanathan,K., Koul M.,P., Dorjey,N., Dorji,R., Chitnis V.,K., Tickoo A.,C., Rannot R.,K, Yadav K., 2024, Observations of the Crab Nebula with MACE (Major Atmospheric Cherenkov Experiment)

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