BL Lac object located in the constellation Boötes
H1426+428 also known as1ES 1426+428 , is a high-frequency peakedBL Lacertae object (HBL)[ 1] [ 2] constellation ofBoötes . It is located at a relatively high[ 3] redshift of (z) 0.129,[ 4] astronomers who presented a catalogue of X-ray sources taken with theHEAO 1 satellite .[ 5]
H1426+428 is classified as ablazar .[ 6] TeV gamma rays .[ 7] [ 8] synchrotron peak that is above 100KeV .[ 6] [ 9] elliptical galaxy and is luminous inX-ray bands. It has a 2-6 keV luminosity of ~1044 erg s−1 .[ 10]
The gamma emission in H1426+428 is found to have an averageflux . Its spectrum is very steep and shows a differentialspectral index of γ = -3.60 ± 0.57, when observed by theCosmic Anisotropy Telescope (CAT) in Very High energy gamma ray bands between 1998 and 2000.[ 11] intergalactic medium [ 12] cosmic infrared background .[ 11]
In 2002, H1426+428 exhibited variability in the 3-24 keVX-ray spectra .[ 13] CELESTE Cherenkov telescope .[ 14] [ 15] flare was detected in H1426+428 in January 2021 by theX-ray telescope onboardNeil Gehrels Swift Observatory .[ 16] [ 17]
H1426+428 has a compact radio core with a ~ 17mJy flux density. In additional, it has a faintradio jet extending towards northwest with a projectposition angle of -25°.[ 18] radio halo that is surrounding the radio core as well[ 19] polarization .[ 20]
^ Nilsson, K.; Lindfors, E.; Takalo, L. O.; Reinthal, R.; Berdyugin, A.; Sillanpää, A.; Ciprini, S.; Halkola, A.; Heinämäki, P.; Hovatta, T.; Kadenius, V.; Nurmi, P.; Ostorero, L.; Pasanen, M.; Rekola, R.; Saarinen, J.; Sainio, J.; Tuominen, T.; Villforth, C.; Vornanen, T.; Zaprudin, B. (2018)."Long-term optical monitoring of TeV emitting blazars" .Astronomy & Astrophysics .620 : A185.arXiv :1810.01751 doi :10.1051/0004-6361/201833621 ^ Mueller, C.; Akhter, N.; Ball, J.; Bramel, D.A.; Carson, J.; Covault, C.E.; Driscoll, D.; Fortin, P.; Gingrich, D.M.; Hanna, D.S.; Jarvis, A.; Kildea, J.; Lindner, T.; Mukherjee, R.; Ong, R.A. (April 2011)."Very high-energy observations of the two high-frequency peaked BL Lac objects 1ES 1218+304 and H 1426+428" .Astroparticle Physics .34 (9):674– 678.arXiv :1104.2770 Bibcode :2011APh....34..674M .doi :10.1016/j.astropartphys.2011.01.010 .ISSN 0927-6505 . ^ Fan, Y. Z.; Dai, Z. G.; Wei, D. M. (February 2004)."Strong GeV emission accompanying TeV blazar H1426+428" (PDF) .Astronomy & Astrophysics .415 (2):483– 486.arXiv :astro-ph/0310893 Bibcode :2004A&A...415..483F .doi :10.1051/0004-6361:20034472 .ISSN 0004-6361 . ^ Horan and the VERITAS Collaboration, D. (2001)."Observations of the BL Lac object, 1H1426+428 at TeV gamma-ray energies" .AIP Conference Proceedings .587 . AIP:324– 328.Bibcode :2001AIPC..587..324H .doi :10.1063/1.1419423 . ^ Nugent, J. J.; Jensen, K. A.; Nousek, J. A.; Garmire, G. P.; Mason, K. O.; Walter, F. M.; Bowyer, C. S.; Stern, R. A.; Riegler, G. R. (January 1983)."HEAO A-2 soft X-ray source catalog" .The Astrophysical Journal Supplement Series .51 : 1.Bibcode :1983ApJS...51....1N .doi :10.1086/190838 .ISSN 0067-0049 . ^a b Nowakowski, Tomasz; Phys.org."Observers detect intraday variability of blazar 1ES 1426+42.8" .phys.org . Retrieved2024-10-21 . ^ Horan, D.; Bond, I. H.; Boyle, P. J.; Bradbury, S. M.; Buckley, J. H.; Carter-Lewis, D.; Celik, O.; Cui, W.; Daniel, M.; D'Vali, M.; de la Calle Perez, I.; Duke, C.; Falcone, A.; Fegan, D. J.; Fegan, S. J. (2003-07-01)."Observations of H1426+428 from 1999 to 2002 with the Whipple Observatory 10 m Telescope" .International Cosmic Ray Conference .5 : 2647.arXiv :astro-ph/0305579 Bibcode :2003ICRC....5.2647H . ^ Aharonian, F.; Akhperjanian, A.; Barrio, J.; Beilicke, M.; Bernlöhr, K.; Börst, H.; Bojahr, H.; Bolz, O.; Contreras, J.; Cornils, R.; Cortina, J.; Denninghoff, S.; Fonseca, V.; Girma, M.; Gonzalez, J. (2002-03-01)."TeV gamma rays from the blazar H 1426+428 and the diffuse extragalactic background radiation" .Astronomy & Astrophysics .384 (3):L23 – L26 .arXiv :astro-ph/0202072 Bibcode :2002A&A...384L..23A .doi :10.1051/0004-6361:20020206 .ISSN 0004-6361 . ^ Chang, X; Xiong, D R; Yi, T F; Liu, C X; Bhatta, G; Xu, J R; Gong, Y L (2024-08-07)."Optical intraday variability analysis for the BL Lacertae object 1ES 1426+42.8" .Monthly Notices of the Royal Astronomical Society .533 (1):120– 130.arXiv :2409.06983 doi :10.1093/mnras/stae1839 ISSN 0035-8711 . ^ Horan, D.; Badran, H.M.; Bond, I.H.; Bradbury, S.M.; Buckley, J.H.; Carson, M.J.; Carter-Lewis, D.A.; Catanese, M.; Cui, W.; Dunlea, S.; Das, D.; Calle Perez, I. de la; D'Vali, M. (June 2002)."Detection of the BL Lacertae Object H1426+428 at TeV Gamma-Ray Energies" .The Astrophysical Journal .571 (2):753– 762.arXiv :astro-ph/0202185 Bibcode :2002ApJ...571..753H .doi :10.1086/340019 . ^a b Djannati-Ataï, A.; Khelifi, B.; Vorobiov, S.; Bazer-Bachi, R.; Chounet, L. M.; Debiais, G.; Degrange, B.; Espigat, P.; Fabre, B.; Fontaine, G.; Goret, P.; Gouiffes, C.; Masterson, C.; Piron, F.; Punch, M. (2002-08-09)."Detection of the BL Lac object 1ES 1426+428 in the Very High Energy gamma-ray band by the CAT Telescope from 1998–2000" (PDF) .Astronomy & Astrophysics .391 (3):L25 – L28 .arXiv :astro-ph/0207618 Bibcode :2002A&A...391L..25D .doi :10.1051/0004-6361:20021034 .ISSN 0004-6361 . ^ Petry, D.; Bond, I.H.; Bradbury, S.M.; Buckley, J.H.; Carter-Lewis, D.A.; Cui, W. (November 2002)."The TeV Spectrum of H1426+428" .The Astrophysical Journal .580 (1):104– 109.arXiv :astro-ph/0207506 Bibcode :2002ApJ...580..104P .doi :10.1086/343102 . ^ Falcone, A.D. (April 2004)."X-ray and TeV observations of the extreme BL Lac AGN H1426+428 during 2002" .New Astronomy Reviews .48 (5– 6):415– 417.Bibcode :2004NewAR..48..415F .doi :10.1016/j.newar.2003.12.051 .ISSN 1387-6473 . ^ Smith, D. A.; Brion, E.; Britto, R.; Bruel, P.; Bussons Gordo, J.; Dumora, D.; Durand, E.; Eschstruth, P.; Espigat, P.; Holder, J.; Jacholkowska, A.; Lavalle, J.; Le Gallou, R.; Lott, B.; Manseri, H. (2006-09-12)."Mrk 421, Mrk 501, and 1ES 1426+428 at 100 GeV with the CELESTE Cherenkov telescope" (PDF) .Astronomy & Astrophysics .459 (2):453– 464.arXiv :astro-ph/0608247 Bibcode :2006A&A...459..453S .doi :10.1051/0004-6361:20065884 .ISSN 0004-6361 . ^ Strigunov, K. S.; Zhovtan, A. V. (March 2015)."Long-term observations of the blazar 1ES 1426+428 with the GT-48 Cerenkov telescope" .Astronomy Reports .59 (3):175– 182.Bibcode :2015ARep...59..175S .doi :10.1134/s1063772915020079 .ISSN 1063-7729 . ^ Kapanadze, Bidzina (2021-04-01)."Long-Term X-ray Flaring Activity of the TeV-Detected Blazar H1426+428" .The Astronomer's Telegram .14560 : 1.Bibcode :2021ATel14560....1K . ^ Quinn, John (March 2021)."VERITAS detection of an elevated VHE flux from the blazar H 1426+428" .The Astronomer's Telegram .14501 : 1.Bibcode :2021ATel14501....1Q . ^ Piner, B. Glenn; Pant, Niraj; Edwards, Philip G. (May 2008)."The Parsec-Scale Jets of the TeV Blazars H1426+428, 1ES 1959+650, and PKS 2155−304: 2001–2004" .The Astrophysical Journal .678 (1):64– 77.arXiv :0801.2749 Bibcode :2008ApJ...678...64P .doi :10.1086/533521 .ISSN 0004-637X . ^ Giroletti, M.; Giovannini, G.; Taylor, G. B.; Falomo, R. (October 2004)."A Sample of Low-Redshift BL Lacertae Objects. I. The Radio Data" .The Astrophysical Journal .613 (2):752– 769.arXiv :astro-ph/0406255 Bibcode :2004ApJ...613..752G .doi :10.1086/423231 .ISSN 0004-637X . ^ Kollgaard, R. I.; Gabuzda, D. C.; Feigelson, E. D. (March 1996)."Parsec-Scale Radio Structure of Four X-Ray--selected BL Lacertae Objects" .The Astrophysical Journal .460 : 174.Bibcode :1996ApJ...460..174K .doi :10.1086/176959 .ISSN 0004-637X .
