M 87

Observation Date (UT)	Observation Lat
	ARGO-YBJ (30.11) ASTRI Mini-Array (28.3) CANGAROO (-31.10 ) CAT (42.50) Crimea (45) CTA pSCT (31.68) CTA South (-24.6272) Durham (-30.48) FACT (28.76) H.E.S.S. (-23.16) HAGAR (30) HAWC (19.0) HEGRA (28.76) LHAASO (29.358) LST-1 (28.76) MACE (32.78) MAGIC (28.76) Milagro (35.88 ) Potchefstroom (-26.9) TACTIC (24.6) TAIGA (103.07) Telescope Array (39.3) Tibet (30.11) VERITAS (31.68) Whipple (31.68)

Canonical Name:	M 87
TeVCat Name:	TeV J1230+123
Other Names:	1ES 1228+126 1H 1226+128
Source Type:	FRI
R.A.:	12 30 47.2 (hh mm ss)
Dec.:	+12 23 51 (dd mm ss)
Gal Long:	283.74 (deg)
Gal Lat:	74.49 (deg)
Distance:	z=0.0044
Flux:	0.075 (Crab Units)
Energy Threshold:	730 GeV
Spectral Index:
Extended:	No
Discovery Date:	2003-05
Discovered By:	HEGRA
TeVCat SubCat:	Default Catalog

Source Notes:

Source position and its uncertainty:
From Acciari et al. (2008):
- RA (J2000): 12h 30m 46s +/- 4s(stat) +/ 6s(syst)
- Dec (J2000): +12d 23' 21" +/- 50"(stat) +/- 1'30"(syst)
From Aharonian et al. (2006) - position used in main table:
- RA (J2000): 12h30m47.2s +/- 1.4s(stat) +/-20s(syst)
- Dec (J2000): +12d23'51" +/- 19"(stat) +/- 20"(syst)
From Aharonian et al. (2003):
- RA (J2000): 12h30m54.4s +/- 6.9s(stat) +/- 1.7s(syst)
- Dec (J2000): 12d24'17" +/- 1.7'(stat) +/- 0.4'(syst)

Source Distance:
Nominal distance is 16 Mpc

Spectral Information and Flux:
From MAGIC Collaboration (2020):
- "The integral flux level between 2012 and 2015 is compatible with
those observed with H.E.S.S. in 2004 (Aharonian et al. 2006) and with
MAGIC between 2005 and 2007 (Aleksic et al. 2012), when the source
was in a low emission state in the TeV band, which can be defined as
some 5-10% of the Crab Nebula flux at energies 400 GeV < E < 1 TeV."
- We therefore quote a flux of 7.5% Crab in TeVCat.
- "The low emission state is clearly separated from the flaring periods
in 2005, 2008 and 2010 ( 2009; Abramowski et al. 2012;
Beilicke & VERITAS Collaboration 2012)."

- "Mean integral flux above 300 GeV observed with MAGIC between 2012
and 2015 obtained from a fit with a constant to the approx. 20-day
binned light curves (F>300 GeV [10-12 cm-2 s-1]):"
... 2012: 1.18 +/- 0.25
... 2013: 1.72 +/- 0.30
... 2014: 1.49 +/- 0.22
... 2015: 1.25 +/- 0.33
... 2012-2015: 1.44 +/- 0.13

- The authors also compiled the flux and spectral information for other TeV observations:
... "Comparison of the integral fluxes (400 GeV < E < 1 TeV), spectral
indices (A) and differential fluxes observed in 2004-2005 with
H.E.S.S. (Aharonian et al. 2006), 2005-2007 with MAGIC (Aleksic et al. 2012),
in 2007 and 2010 with VERITAS (Acciari et al. 2008; Aliu et al. 2012),
in 2008 with MAGIC (Albert et al. 2008) and between 2012 and 2015 with
MAGIC (this work). The integral fluxes are extrapolated from the
simple power-law fits to the observed spectra. The differential flux
is compared for the decorrelation energy of 784 GeV obtained for the
data of this work, adopting the parameters of the individual fits. The
values shown include statistical errors only and are obtained by error
propagation assuming the errors of the flux normalization and the
spectral index to be uncorrelated."

Array	Year		F 400 GeV		A		f E=784 GeV
			[10-12 cm-2 s-1]				[10-12 TeV-1cm-2s-1]
H.E.S.S.	2004		0.51 +/- 0.22		-2.62 +/- 0.35		0.46 +/- 0.15
H.E.S.S.	2005		1.97 +/- 0.44		-2.22 +/- 0.15		2.01 +/- 0.28
MAGIC	2005 - 2007		0.90 +/- 0.44		-2.21 +/- 0.21		0.92 +/- 0.24
VERITAS	2007		1.31 +/- 0.38		-2.31 +/- 0.17		1.30 +/- 0.23
MAGIC	2008		5.09 +/- 1.00		-2.30 +/- 0.11		5.06 +/- 0.66
VERITAS	2010		7.82 +/- 0.80		-2.19 +/- 0.07		8.03 +/- 0.51
MAGIC	2012 - 2015		0.74 +/- 0.08		-2.41 +/- 0.07		0.71 +/- 0.06

From Aleksic et al.(2012):
- Spectral index: 2.21 +/- 0.21
From Acciari et al. (2008):
- Spectral index: 2.31 +/- 0.17 (stat) +/- 0.2 (syst)
From Aharonian et al. (2006):
- Spectral index (2005 data): 2.22 +/- 0.15 (stat) +/- 0.1 (syst)
- Spectral index (2004 data): 2.63 +/- 0.35 (stat) +/- 0.1 (syst)
From Aharonian et al. (2003):
- Spectral index: 2.9 +/- 0.8(stat) +/- 0.08(syst)

Classification:

From Albert et al. (2008):
- "M87 is a giant elliptical radio galaxy (RG) of Fanaroff Riley I
type (FR I; Fanaroff & Riley 1974)"


Seen by: HEGRA, H.E.S.S., VERITAS, MAGIC, HAWC

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• The Role of Stochastic Fermi-type Particle Acceleration in the Inner Jets of Active Galactic Nuclei
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• Characteristics of Powerful Radio Galaxies
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• Imprints of M87 Jet Precession on the Black Hole-Accretion Disk System
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• M 87: a cosmic laboratory for deciphering black hole accretion and jet formation
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• The year-scale X-ray variations in the core of M87
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• Transverse Oscillations of the M87 Jet Revealed by KaVA Observations
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• Constraining the cosmic-ray pressure in the inner Virgo Cluster using H.E.S.S. observations of M 87
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• Jump-starting relativistic flows, and the M87 jet
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• A ring-like accretion structure in M87 connecting its black hole and jet
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• CLEAN imaging systematics of M87 radio jet
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• The Accretion flow in M87 is really MAD
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• Investigating the Disk-Jet Structure in M87 through Flux Separation in the Linear and Circular Polarization Images
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• Numerical Investigation of Dynamical and Morphological Trends in Relativistic Jets
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• Modeling the inner part of M87 jet: confronting jet morphology with theory
  Yang, Hai et al., arXiv e-prints parXiv:2206.05661 (2022) [LINK]
  
• Implications from the velocity profile of the M87 jet: a possibility of a slowly rotating black hole magnetosphere
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• The Details of Limb Brightening Reveal the Structure of the Base of the Jet in M87 for the First Time
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• Hadronuclear interactions in the jet of low TeV luminosity AGN: Implications for the low-state very-high-energy gamma-ray emission
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• Interface instabilities in hydrodynamic relativistic jets
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• Positron Effects on Polarized Images and Spectra from Jet and Accretion Flow Models of M87 and Sgr A*
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• Probing micro-eV ALPs with future LHAASO observation of AGN gamma-ray spectra
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• Absorption effects in the blazar's gamma-ray spectra due to luminous stars crossing the jet
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• Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign
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• The Bulk Flow Velocity and Acceleration of the Inner Jet in M 87
  Punsly, Brian, arXiv e-prints parXiv:2106.13886 (2021) [LINK]
  
• An Arecibo Search for Fast Radio Transients from M87
  Suresh, Akshay et al., arXiv e-prints parXiv:2107.09687 (2021) [LINK]
  
• The response of black hole spark gaps to external changes: A production mechanism of rapid TeV flares?
  Kisaka, Shota et al., arXiv e-prints parXiv:2108.02971 (2021) [LINK]
  
• Relativistic jet acceleration region in a black hole magnetosphere
  Takahashi, Masaaki et al., arXiv e-prints parXiv:2109.05868 (2021) [LINK]
  
• Search for multi-flare neutrino emissions in 10 years of IceCube data from a catalog of sources
  IceCube collaboration et al., arXiv e-prints parXiv:2109.05818 (2021) [LINK]
  
• Modeling the non-flaring VHE emission from M87 as detected by the HAWC gamma ray observatory
  Ure\na-Mena, Fern et al., arXiv e-prints parXiv:2108.01048 (2021) [LINK]
  
• Monitoring the radio galaxy M87 with HAWC
  Capistran, T. et al., arXiv e-prints parXiv:2108.00113 (2021) [LINK]
  
• The Study of X-Ray Flux Variability of M87
  Imazawa, Ryo et al., arXiv e-prints parXiv:2109.01542 (2021) [LINK]
  
• Gamma-Rays from Star Forming Activity Appear to Outshine Misaligned Active Galactic Nuclei
  Blanco, Carlos and Linden, Tim, arXiv e-prints parXiv:2104.03315 (2021) [LINK]
  
• Multiwavelength View of the M87 Black Hole Captured by the Event Horizon Telescope
  Principe, G. et al., Research Notes of the American Astronomical Society 5 p221 (2021) [LINK]
  
• Magnetically Induced Anisotropies in the Arrival Directions of Ultra-high-energy Cosmic Rays from Nearby Radio Galaxies
  de Oliveira, Caina and de Souza, Vitor, arXiv e-prints parXiv:2112.02415 (2021) [LINK]
  
• Study of the Very High Energy emission of M87 through its broadband spectral energy distribution
  HAWC Collaboration et al., arXiv e-prints parXiv:2112.09179 (2021) [LINK]
  
• Monitoring of the radio galaxy M87 during a low emission state from 2012 to 2015 with MAGIC
  MAGIC Collaboration et al., arXiv e-prints parXiv:2001.01643 (2020) [LINK]
  
• A two-fluid model for black-hole accretion flows: Particle acceleration, outflows, and TeV emission
  Lee, Jason P. and Becker, Peter A., MNRAS 491 p4194-4220 (2020) [LINK]
  
• Observational signatures of disk and jet misalignment in images of accreting black holes
  Chatterjee, Koushik et al., arXiv e-prints parXiv:2002.08386 (2020) [LINK]
  
• Disk evolution of the M87's nucleus observed in 2008
  Xiang, Fei and Cheng, Cheng, arXiv e-prints parXiv:2002.09122 (2020) [LINK]
  
• Hadronic High-energy Emission from Magnetically Arrested Disks in Radio Galaxies
  Kimura, Shigeo S. and Toma, Kenji, arXiv e-prints parXiv:2003.13173 (2020) [LINK]
  
• Gap-type particle acceleration in the magnetospheres of rotating supermassive black holes
  Katsoulakos, Grigorios and Rieger, Frank M., arXiv e-prints parXiv:2005.05076 (2020) [LINK]
  
• Low optical polarisation at the core of the optically-thin jet of M87
  Fresco, A.Y. et al., arXiv e-prints parXiv:2005.14719 (2020) [LINK]
  
• Linear polarization in the nucleus of M87 at 7 mm and 1.3 cm
  Kravchenko, E. et al., A&A 637 pL6 (2020) [LINK]
  
• The Origin of Matter at the Base of Relativistic Jets in Active Galactic Nuclei
  Romero, Gustavo and Gutierrez, Eduardo, Universe 6 p99 (2020) [LINK]
  
• Monitoring the Morphology of M87* in 2009-2017 with the Event Horizon Telescope
  Wielgus, Maciek et al., ApJ 901 p67 (2020) [LINK]
  
• M87 black hole mass and spin estimate through the position of the jet boundary shape break
  Nokhrina, E.E. et al., arXiv e-prints p (2019) [LINK]
  
• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
  Event Horizon Telescope Collaboration et al., ApJ 875 pL1 (2019) [LINK]
  
• First M87 Event Horizon Telescope Results. II. Array and Instrumentation
  Event Horizon Telescope Collaboration et al., ApJ 875 pL2 (2019) [LINK]
  
• First M87 Event Horizon Telescope Results. III. Data Processing and Calibration
  Event Horizon Telescope Collaboration et al., ApJ 875 pL3 (2019) [LINK]
  
• First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
  Event Horizon Telescope Collaboration et al., ApJ 875 pL4 (2019) [LINK]
  
• First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring
  Event Horizon Telescope Collaboration et al., ApJ 875 pL5 (2019) [LINK]
  
• First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole
  Event Horizon Telescope Collaboration et al., ApJ 875 pL6 (2019) [LINK]
  
• Constraining a black hole companion for M87* through imaging by the Event Horizon Telescope
  Safarzadeh, Mohammadtaher et al., arXiv e-prints parXiv:1905.06835 (2019) [LINK]
  
• Detection of Superluminal Motion in the X-ray Jet of M87
  Snios, Bradford et al., arXiv e-prints parXiv:1905.04330 (2019) [LINK]
  
• Monitoring radio galaxies at TeV energies with HAWC
  Avila Rojas, Daniel et al., arXiv e-prints parXiv:1909.00075 (2019) [LINK]
  
• The unique case of the active galactic nucleus core of M87: a misaligned low-power blazar?
  Lucchini, M. et al., MNRAS 489 p1633-1643 (2019) [LINK]
  
• Kinematics of the M87 jet in the collimation zone: gradual acceleration and velocity stratification
  Park, Jongho et al., arXiv e-prints parXiv:1911.02279 (2019) [LINK]
  
• Spectral index-mass accretion rate correlation and evaluation of black hole masses in AGNs 3C 454.3 and M87
  Titarchuk, Lev et al., arXiv e-prints parXiv:1911.03180 (2019) [LINK]
  
• Phenomenology of axion-like particles coupling with photons in the jets of active galactic nuclei
  Ayad, Ahmed and Beck, Geoff, arXiv e-prints parXiv:1911.10075 (2019) [LINK]
  
• Probing a cosmic axion-like particle background within the jets of active galactic nuclei
  Ayad, Ahmed and Beck, Geoff, arXiv e-prints parXiv:1911.10078 (2019) [LINK]
  
• Features of Structure and Absorption in the Jet-Launching Region of M87
  Zhao, Wei et al., arXiv e-prints parXiv:1910.14299 (2019) [LINK]
  
• Relativistic polytrope from the collimation and acceleration profiles of the M87 jet at subparsec scales and thermodynamic evidence for the Blandford-Znajek mechanism
  Sobyanin, Denis Nikolaevich, MNRAS 489 pL7-L11 (2019) [LINK]
  
• Statistical analysis on X-ray flares from the nucleus and HST-1 knot in the M87 jet
  Yang, Shenbang et al., MNRAS 489 p2685-2693 (2019) [LINK]
  
• A survey of Active Galaxies with the HAWC Gamma-ray Observatory
  Carraminana, Alberto et al., arXiv e-prints parXiv:1908.06831 (2019) [LINK]
  
• A New Solution to the Plasma Starved Event Horizon Magnetosphere: Application to the Forked Jet in M87
  Punsly, B. et al., ArXiv e-prints p (2018) [LINK]
  
• The complex gamma-ray behaviour of the Radio Galaxy M87
  Ait Benkhali, F. et al., ArXiv e-prints p (2018) [LINK]
  
• The Structure and Dynamics of the Sub-parsec Scale Jet in M87 Based on 50 VLBA Observations Over 17 Years at 43 GHz
  Walker, R.C. et al., ArXiv e-prints p (2018) [LINK]
  
• Differentiating Disk and Black Hole Driven Jets with EHT Images of Variability in M87
  Jeter, B. et al., ArXiv e-prints p (2018) [LINK]
  
• Jigsaw falling into place: a toy model for the acceleration of blazar jets
  Liodakis, I., ArXiv e-prints p (2018) [LINK]
  
• Fornax A, Centaurus A and other radio galaxies as sources of ultra-high energy cosmic rays
  Matthews, J.H. et al., ArXiv e-prints p (2018) [LINK]
  
• Black hole spin from wobbling and rotation of the M87 jet and a sign of a magnetically arrested disc
  Nikolaevich Sob'yanin, D., ArXiv e-prints p (2018) [LINK]
  
• The photocentre-AGN displacement: is M87 actually harbouring a displaced supermassive black hole?
  Loopez-Navas, E. and Prieto, M.A., MNRAS 480 p4099-4112 (2018) [LINK]
  
• How frequent are close supermassive binary black holes in powerful jet sources?
  Krause, M.G.H. et al., ArXiv e-prints p (2018) [LINK]
  
• Two-temperature, Magnetically Arrested Disc simulations of the jet from the supermassive black hole in M87
  Chael, A. et al., ArXiv e-prints p (2018) [LINK]
  
• Radio Galaxies at VHE energies
  Rieger, F.M. and Levinson, A., ArXiv e-prints p (2018) [LINK]
  
• Parabolic Jets from the Spinning Black Hole in M87
  Nakamura, M. et al., ArXiv e-prints p (2018) [LINK]
  
• Search for ultra high energy cosmic rays sources. Radiogalaxy Virgo A
  Kobzar, O. et al., ArXiv e-prints p (2018) [LINK]
  
• The Future of Black Hole Astrophysics in the LIGO-VIRGO-LPF Era
  Blandford, R. and Anantua, R., ArXiv e-prints p (2017) [LINK]
  
• Jet in jet in M87
  Sob'yanin, D.N., MNRAS 471 p4121-4127 (2017) [LINK]
  
• Highlights of the MAGIC AGN program
  Sitarek, J. and the MAGIC Collaboration, ArXiv e-prints p (2017) [LINK]
  
• Observation of radio galaxies with HAWC
  Avila Rojas, D. et al., ArXiv e-prints p (2017) [LINK]
  
• Hard X-ray Emission from the M87 AGN Detected with NuSTAR
  Wong, K.-W. et al., ArXiv e-prints p (2017) [LINK]
  
• Magnetospheric Gamma-Ray Emission in Active Galactic Nuclei
  Katsoulakos, G. and Rieger, F.M., ArXiv e-prints p (2017) [LINK]
  
• Far-UV Emission Properties of FR1 Radio Galaxies
  Danforth, C.W. et al., ArXiv e-prints p (2016) [LINK]
  
• Neutrino, gamma-ray and cosmic ray fluxes from the core of the closest radio galaxies
  Fraija, N. and Marinelli, A., ArXiv e-prints p (2016) [LINK]
  
• An accretion-jet model for M87: interpreting the spectral energy distribution and Faraday rotation measure
  Feng, J. et al., ArXiv e-prints p (2016) [LINK]
  
• Gamma-Rays from Non-Blazar AGN
  Rieger, F.M., ArXiv e-prints p (2016) [LINK]
  
• A strong radio brightening at the jet base of M87 in the period of the elevated TeV gamma-ray state in 2012
  Hada, K. et al., ArXiv e-prints p (2015) [LINK]
  
• High-energy Emission Processes in M 87
  de Jong, S. et al., ArXiv e-prints p (2015) [LINK]
  
• 230 GHz VLBI observations of M87: event-horizon-scale structure at the enhanced very-high-energy gamma-ray state in 2012
  Akiyama, K. et al., ArXiv e-prints p (2015) [LINK]
  
• Longitudinal and transverse velocity fields in parsec-scale jets
  Mertens, F. and Lobanov, A., ArXiv e-prints p (2015) [LINK]
  
• Highlights from the VERITAS AGN Observation Program
  Benbow, W. and for the VERITAS Collaboration, ArXiv e-prints p (2015) [LINK]
  
• Very high energy neutrino expectation from Fanaroff-Riley I sources
  Marinelli, A. and Fraija, N., ArXiv e-prints p (2014) [LINK]
  
• Multi-epoch study of the gamma-ray emission within the M87 magnetosphere model
  Vincent, S., ArXiv e-prints p (2014) [LINK]
  
• The Hadronic Picture of the Radiogalaxy M87
  Marinelli, A. et al., ArXiv e-prints p (2014) [LINK]
  
• A strong radio brightening at the jet base of M87 during the elevated very-high-energy gamma-ray state in 2012
  Hada, K. et al., ArXiv e-prints p (2014) [LINK]
  
• Gamma-ray emitting radio galaxies at hard X-rays: Seyfert core or jet emission?
  Beckmann, V. et al., ArXiv e-prints p (2013) [LINK]
  
• Toward a comprehensive model for feedback by active galactic nuclei: new insights from M87 observations by LOFAR, Fermi and H.E.S.S
  Pfrommer, C., ArXiv e-prints p (2013) [LINK]
  
• Hadronic-origin TeV flare of M87 in April 2010
  Sahu, S. and Palacios, E., ArXiv e-prints p (2013) [LINK]
  
• An hourglass model for the flare of HST-1 in M87
  Liu, W.-P. et al., ArXiv e-prints p (2013) [LINK]
  
• The kinematic of HST-1 in the jet of M87
  Giroletti, M. et al., ArXiv e-prints p (2012) [LINK]
  
• Interpretation of the flares of M87 at TeV energies in the cloud-jet interaction scenario
  Barkov, M.V. et al., ArXiv e-prints p (2012) [LINK]
  
• Probing the origin of VHE emission from M 87 with MWL observations in 2010
  Raue, M. et al., ArXiv e-prints p (2012) [LINK]
  
• The H.E.S.S. extragalactic sky
  Raue, M. and for the H.E.S.S. collaboration, ArXiv e-prints p (2012) [LINK]
  
• Jet Launching Structure Resolved Near the Supermassive Black Hole in M87
  Doeleman, S.S. et al., ArXiv e-prints p (2012) [LINK]
  
• On the origin of very high energy gamma-rays from radio galaxies
  Rieger, F.M., ArXiv e-prints p (2012) [LINK]
  
• VERITAS Observations of M 87 in 2011/2012
  Beilicke, M. and the VERITAS Collaboration, ArXiv e-prints p (2012) [LINK]
  
• A cosmic ray cocoon along the X-ray jet of M87?
  Dainotti, M.G. et al., MNRAS 426 p218-225 (2012) [LINK]
  
• Cherenkov and Jansky: Our Understanding of AGN at the Highest Energies
  Perkins, J.S. et al., ArXiv e-prints p (2012) [LINK]
  
• Synchrotron and inverse-Compton emission from blazar jets - II. An accelerating jet model with a geometry set by observations of M87
  Potter, W.J. and Cotter, G., ArXiv e-prints p (2012) [LINK]
  
• Hadronic processes as origin of TeV emission in Fanaroff & Riley Class I: Cen A, M87 and NGC1275
  Fraija, N. et al., p (2012) [LINK]
  
• MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007
  Aleksic, J. et al., A&A 544 pA96 (2012) [LINK]
  
• Probing the Central Black Hole in M87 with Gamma-Rays
  Rieger, F.M. and Aharonian, F., Modern Physics Letters A 27 p30030 (2012) [LINK]
  
• VLBI Observations of the Jet in M 87 during the Very High Energy gamma-ray Flare in 2010 April
  Hada, K. et al., ApJ 760 p52 (2012) [LINK]
  
• The Black Hole Mass in M87 from Gemini/NIFS Adaptive Optics Observations
  Gebhardt, K. et al., ApJ 729 p119-+ (2011) [LINK]
  
• A lepto-hadronic model for the high energy emission from the jets of FR I radiogalaxies
  Reynoso, M.M. et al., 275 p168-169 (2011) [LINK]
  
• Using Twisted Filaments to Model the Inner Jet in M87
  Hardee, P.E. and Eilek, J.A., ArXiv e-prints p (2011) [LINK]
  
• The jet in M87 from e-EVN observations
  Giovannini, G. et al., 275 p150-154 (2011) [LINK]
  
• Signatures of large-scale magnetic fields in AGN jets: transverse asymmetries
  Clausen-Brown, E. et al., ArXiv e-prints p (2011) [LINK]
  
• Modelling TeV gamma-ray emission from the kiloparsec-scale jets of Centaurus A and M87
  Hardcastle, M.J. and Croston, J.H., ArXiv e-prints p (2011) [LINK]
  
• Internal gamma gamma-opacity in Active Galactic Nuclei and the consequences for the TeV observations of M87 and Cen A
  Brodatzki, K.A. et al., ArXiv e-prints p (2011) [LINK]
  
• Variable TeV Emission as a Manifestation of Jet Formation in M87?
  Levinson, A. and Rieger, F., ApJ 730 p123-+ (2011) [LINK]
  
• MAGIC observations of the giant radio galaxy M87 in a low emission state between 2005 and 2007
  Berger, K. et al., ArXiv e-prints p (2011) [LINK]
  
• Optical Polarization and Spectral Variability in the M87 Jet
  Perlman, E.S. et al., ArXiv e-prints p (2011) [LINK]
  
• VERITAS Observation of M 87
  Galante, N., ArXiv e-prints p (2011) [LINK]
  
• Constraints on dark matter annihilation from M87: Signatures of prompt and inverse-Compton gamma rays
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• An Experiment to Locate the Site of TeV Flaring in M87
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