SIMULTANEOUS MULTIWAVELENGTH OBSERVATIONS OF MARKARIAN 421 DURING OUTBURST

Journal Article · Sun Sep 20 00:00:00 EDT 2009 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/703/1/169· OSTI ID:21372020

Acciari, V A; Benbow, W ^[1]; Aliu, E ^[2]; Aune, T ^[3]; Beilicke, M; Buckley, J H; Bugaev, V; Dickherber, R ^[4]; Boettcher, M ^[5]; Bradbury, S M ^[6]; Butt, Y ^[7]; Cannon, A ^[8]; Celik, O; Chow, Y C ^[9]; Cesarini, A ^[10]; Ciupik, L ^[11]; Cogan, P ^[12]; Colin, P ^[13]; Cui, W ^[14]; Duke, C ^[15]

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1. Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645 (United States)
2. Department of Physics and Astronomy and the Bartol Research Institute, University of Delaware, Newark, DE 19716 (United States)
3. Santa Cruz Institute for Particle Physics and Department of Physics, University of California, Santa Cruz, CA 95064 (United States)
4. Department of Physics, Washington University, St. Louis, MO 63130 (United States)
5. Astrophysical Institute, Department of Physics and Astronomy, Ohio University, Athens, OH 45701 (United States)
6. School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT (United Kingdom)
7. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
8. School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland)
9. Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States)
10. School of Physics, National University of Ireland, Galway (Ireland)
11. Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, IL 60605 (United States)
12. Physics Department, McGill University, Montreal, QC H3A 2T8 (Canada)
13. Physics Department, University of Utah, Salt Lake City, UT 84112 (United States)
14. Department of Physics, Purdue University, West Lafayette, IN 47907 (United States)
15. Department of Physics, Grinnell College, Grinnell, IA 50112-1690 (United States)

We report on the results of two coordinated multiwavelength campaigns that focused on the blazar Markarian 421 during its 2006 and 2008 outbursts. These campaigns obtained UV and X-ray data using the XMM-Newton satellite, while the gamma-ray data were obtained utilizing three imaging atmospheric Cerenkov telescopes, the Whipple 10 m telescope and VERITAS, both based in Arizona, as well as the MAGIC telescope, based on La Palma in the Canary Islands. The coordinated effort between the gamma-ray groups allowed for truly simultaneous data in UV/X-ray/gamma-ray wavelengths during a significant portion of the XMM-Newton observations. This simultaneous coverage allowed for a reliable search for correlations between UV, X-ray, and gamma-ray variability over the course of the observations. Investigations of spectral hysteresis and modeling of the spectral energy distributions are also presented.

• OSTI ID: 21372020
• Journal Information: Astrophysical Journal, Vol. 703, Issue 1; Other Information: DOI: 10.1088/0004-637X/703/1/169; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
BL LACERTAE OBJECTS
ENERGY SPECTRA
GAMMA RADIATION
HYSTERESIS
SATELLITES
TELESCOPES
X RADIATION
X-RAY GALAXIES
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
ELECTROMAGNETIC RADIATION
GALAXIES
IONIZING RADIATIONS
RADIATIONS
SPECTRA