What can we learn about the extra-galactic infrared background from Markarian 421?

Details What can we learn about the extra-galactic infrared background from Markarian 421? What can we learn about the extra-galactic infrared background from Markarian 421?

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....7.2725v&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

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Scientific paper

Identification of two nearby active galactic nuclei, Markarian 421 (Mrk 421, z = 0.031) and Markarian 501 (Mrk 501, z = 0.033), as TeV γ-ray emitters has opened a possibility to study the diffuse intergalactic photon field in the wavelength range ˜ 0.5-50 µm. We were fortunate that the BL Lacertae object Mrk 421 has been particularly active during the spring of 2001 showing episodes of extraordinary intense flares in January, February, and March. The Whipple Imaging Atmospheric Cherenkov Telescope (IACT) has continuously monitored this object through the season and collected more than 45 × 103 photons, available now for detailed spectral studies. Another active galactic nuclei (AGN), 1H1426+428, is a newly discovered TeV γ-ray source. It is distinguished for its distance (z = 0.129), the largest among the X-ray selected BL Lacertae objects detected at TeV energies. 1H1426+428 has been intensively observed by the Whipple γ-ray telescope during the 1999, 2000, and 2001 seasons. Although the flux of this source is low, the photon statistics poor, and the cosmic ray background large, we found indications that the spectrum of this source may be steep comparing to Mrk 501. In this paper we identify the framework for studying the low energy intergalactic diffuse photon background based on the spectral properties of these two AGN. We will present our results in detail at the conference.

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