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Title: Multiwavelength study of VHE emission from Markarian 501 using TACTIC observations during April–May, 2012

Authors:
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Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1398731
Grant/Contract Number:
NNX08AW56G; NNX09AU10G; NNX12AO93G
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
New Astronomy
Additional Journal Information:
Journal Volume: 54; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-09 10:55:41; Journal ID: ISSN 1384-1076
Publisher:
Elsevier
Country of Publication:
Country unknown/Code not available
Language:
English

Citation Formats

Chandra, P., Singh, K. K., Rannot, R. C., Yadav, K. K., Bhatt, H., Tickoo, A. K., Ghosal, B., Kothari, M., Gaur, K. K., Goyal, A., Goyal, H. C., Kumar, N., Marandi, P., Chouhan, N., Sahayanathan, S., Chanchalani, K., Agarwal, N. K., Dhar, V. K., Kaul, S. R., Koul, M. K., Koul, R., Venugopal, K., Bhat, C. K., Borwankar, C., Bhagwan, J., and Gupta, A. C. Multiwavelength study of VHE emission from Markarian 501 using TACTIC observations during April–May, 2012. Country unknown/Code not available: N. p., 2017. Web. doi:10.1016/j.newast.2017.01.004.
Chandra, P., Singh, K. K., Rannot, R. C., Yadav, K. K., Bhatt, H., Tickoo, A. K., Ghosal, B., Kothari, M., Gaur, K. K., Goyal, A., Goyal, H. C., Kumar, N., Marandi, P., Chouhan, N., Sahayanathan, S., Chanchalani, K., Agarwal, N. K., Dhar, V. K., Kaul, S. R., Koul, M. K., Koul, R., Venugopal, K., Bhat, C. K., Borwankar, C., Bhagwan, J., & Gupta, A. C. Multiwavelength study of VHE emission from Markarian 501 using TACTIC observations during April–May, 2012. Country unknown/Code not available. doi:10.1016/j.newast.2017.01.004.
Chandra, P., Singh, K. K., Rannot, R. C., Yadav, K. K., Bhatt, H., Tickoo, A. K., Ghosal, B., Kothari, M., Gaur, K. K., Goyal, A., Goyal, H. C., Kumar, N., Marandi, P., Chouhan, N., Sahayanathan, S., Chanchalani, K., Agarwal, N. K., Dhar, V. K., Kaul, S. R., Koul, M. K., Koul, R., Venugopal, K., Bhat, C. K., Borwankar, C., Bhagwan, J., and Gupta, A. C. Sat . "Multiwavelength study of VHE emission from Markarian 501 using TACTIC observations during April–May, 2012". Country unknown/Code not available. doi:10.1016/j.newast.2017.01.004.
@article{osti_1398731,
title = {Multiwavelength study of VHE emission from Markarian 501 using TACTIC observations during April–May, 2012},
author = {Chandra, P. and Singh, K. K. and Rannot, R. C. and Yadav, K. K. and Bhatt, H. and Tickoo, A. K. and Ghosal, B. and Kothari, M. and Gaur, K. K. and Goyal, A. and Goyal, H. C. and Kumar, N. and Marandi, P. and Chouhan, N. and Sahayanathan, S. and Chanchalani, K. and Agarwal, N. K. and Dhar, V. K. and Kaul, S. R. and Koul, M. K. and Koul, R. and Venugopal, K. and Bhat, C. K. and Borwankar, C. and Bhagwan, J. and Gupta, A. C.},
abstractNote = {},
doi = {10.1016/j.newast.2017.01.004},
journal = {New Astronomy},
number = C,
volume = 54,
place = {Country unknown/Code not available},
year = {Sat Jul 01 00:00:00 EDT 2017},
month = {Sat Jul 01 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.newast.2017.01.004

Citation Metrics:
Cited by: 1work
Citation information provided by
Web of Science

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  • The blazar Markarian 501 (Mrk 501) was observed above 100 GeV with the MAGIC Telescope during May, June and July 2005. The high sensitivity of the instrument made possible the detection of the source with high significance in each of the observing nights. During this observational campaign, the emitted gamma-ray flux from Mkn 501 was found to vary by one order of magnitude, and showed a high correlation with spectral changes. Intra-night flux variability was also observed, with flux-doubling times of {approx} 2 minutes. The data showed a clear evidence of a spectral peak (in the {nu}F{nu} representation) during themore » nights when the gamma-ray activity was highest. The location of this spectral feature was found to be correlated with the emitted gamma-ray flux. In these proceedings we discuss some of the results of this unprecedented spectral and temporal analysis of Mrk 501 observations in the very high energy range.« less
  • The blazar Markarian 501 (Mrk 501) was observed at energies above 100 GeV with the MAGIC telescope from May through July 2005. The high sensitivity of the instrument enabled the determination of the flux and spectrum of the source on a night-by-night basis. Throughout our observational campaign, the flux from Mrk 501 was found to vary by an order of magnitude, and to be correlated with spectral changes. Intra-night flux variability with flux-doubling times down to 2 minutes was also observed. The strength of variability increased with the energy of the {gamma}-ray photons. The energy spectra were found to hardenmore » significantly with increasing flux, and a spectral peak clearly showed up during very active states. The position of the spectral peak seems to be correlated with the source luminosity.« less
  • We present multiwavelength observations of Markarian 501 (Mrk 501) during a flare in 1997 April. Evidence of correlated variability is seen in observations above 350 GeV taken with the Whipple Observatory very high energy (VHE) {gamma}-ray telescope, 50 keV{endash}10 MeV data from OSSE, and quicklook results from the All-Sky Monitor (ASM) of {ital RXTE}. EGRET did not detect Mrk 501. Short term optical correlations are not conclusive but the U-band flux observed with the 1.2m telescope of the Whipple Observatory was 10{percent} higher than in 1997 March. The average energy output of Mrk 501 appears to peak in the 2more » keV to 100 keV range. The VHE {gamma}-ray energy output is somewhat lower but more variable. These results imply an extension of the synchrotron emission in Mrk 501 to at least 100 keV, the highest observed in a blazar. {copyright} {ital 1997 American Institute of Physics.}« less
  • The blazar Markarian 501 (Mrk 501) was observed above 100 GeV with the MAGIC Telescope during May, June and July 2005. The high sensitivity of the instrument made possible the detection of the source with high significance in each of the observing nights. During this observational campaign, the emitted gamma-ray flux from Mkn 501 was found to vary by one order of magnitude, and showed a high correlation with spectral changes. Intra-night flux variability was also observed, with flux-doubling times of {approx} 2 minutes. The data showed a clear evidence of a spectral peak (in the nuFnu representation) during themore » nights when the gamma-ray activity was highest. The location of this spectral feature was found to be correlated with the emitted gamma-ray flux. In these proceedings we discuss some of the results of this unprecedented spectral and temporal analysis of Mrk 501 observations in the very high energy range.« less