<i>FERMI</i>DISCOVERY OF GAMMA-RAY EMISSION FROM NGC 1275

Abdo, A. A.; Ackermann, M.; Ajello, M.; Asano, Katsuaki; Baldini, Luca; Ballet, J.; Barbiellini, G.; Bastieri, D.; Baughman, B. M.; Bechtol, K.; Bellazzini, R.; Blandford, R. D.; Bloom, E. D.; Bonamente, E.; Borgland, A. W.; Bregeon, J.; Brez, A.; Brigida, M.; Bruel, Pascal; Burnett, T. H.; Caliandro, G. A.; Cameron, R. A.; Caraveo, P. A.; Casandjian, J. M.; Cavazzuti, E.; Cecchi, C.; Celotti, A.; Chekhtman, A.; Cheung, C. C.; Chiang, J.; Ciprini, S.; Claus, R.; Cohen-Tanugi, J.; Colafrancesco, S.; Cominsky, L.; Conrad, J.; Costamante, L.; Dermer, C. D.; Angelis, A. De; Palma, F. de; Digel, S. W.; Donato, D.; Silva, E. do Couto e; Drell, P. S.; Dubois, R.; Dumora, D.; Farnier, C.; Favuzzi, C.; Finke, J.; Focke, W. B.; Frailis, M.; Fukazawa, Yasushi; Funk, S.; Fusco, P.; Gargano, F.; Georganopoulos, Markos; Germani, S.; Giebels, B.; Giglietto, N.; Giordano, F.; Glanzman, T.; Grenier, I. A.; Grondin, M.‐H.; Grove, J. E.; Guillemot, L.; Guiriec, S.; Hanabata, Y.; Harding, A. K.; Hartman, R. C.; Hayashida, M.; Hays, E.; Hughes, R. E.; Jóhannesson, G.; Johnson, A. S.; Johnson, R. P.; Johnson, W. N.; Kadler, M.; Kamae, T.; Kanai, Yoshikazu; Katagiri, H.; Kataoka, J.; Kawai, N.; Kerr, M.; Knödlseder, J.; Kuehn, F.; Kuss, M.; Latronico, L.; Lemoine‐Goumard, M.; Longo, F.; Loparco, F.; Lott, B.; Lovellette, M. N.; Lubrano, P.; Madejski, G. M.; Makeev, A.; Mazziotta, M. N.; McEnery, J. E.; Meurer, C.; Michelson, P. F.; Mitthumsiri, W.; Mizuno, T.; Моисеев, А. А.; Monte, C.; Monzani, M. E.; Morselli, A.; Moskalenko, I. V.; Murgia, S.; Nakamori, Takeshi; Nolan, P. L.; Norris, J. P.; Nuss, E.; Ohsugi, T.; Omodei, N.; Orlando, E.; Ormes, J. F.; Paneque, D.; Panetta, J.; Parent, D.; Pepé, M.; Pesce-Rollins, M.; Piron, F.; Porter, T. A.; Rainò, S.; Razzano, M.; Reimer, A.; Reimer, O.; Reposeur, T.; Ritz, S.; Rodriguez, A. Y.; Romani, Roger W.; Ryde, F.; Sadrozinski, H. F-W.; Sambruna, R. M.; Sánchez, David; Sander, A.; Sato, Rie; Parkinson, P. M. Saz; Sgrò, C.; Smith, D. A.; Smith, P. D.; Spandre, G.; Spinelli, P.; Starck, Jean-Luc; Strickman, M. S.; Strong, A. W.; Suson, D. J.; Tajima, H.; Takahashi, H.; Takahashi, T.; Tanaka, Takaaki; Taylor, G. B.; Thayer, J. G.; Thompson, D. J.; Torres, D. F.; Tosti, G.; Uchiyama, Y.; Usher, T.; Vilchez, N.; Vitale, V.; Waite, A. P.; Wood, K. S.; Ylinen, T.; Ziegler, M.; Aller, H. D.; Aller, M. F.; Kellermann, K. I.; Kovalev, Y. Y.; Kovalev, Yu. A.; Lister, M. L.; Pushkarev, A. B.

doi:10.1088/0004-637x/699/1/31

Cited by 186 publications

(187 citation statements)

References 58 publications

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“…Recently, a detection was reported by the MAGIC collaboration in the Perseus Cluster. However, this signal, also detected by Fermi-LAT (Abdo et al 2009), is consistent with an emission from the giant elliptical galaxy NGC 1275 lying at its centre (Aleksić et al 2010(Aleksić et al , 2012. From the Fermi-LAT results, Colafrancesco et al (2010) argue that it should be possible to resolve and detect the diffuse γ-ray flux of astrophysical origin coming from the outer corona of the Perseus cluster.…”

Section: Introductionsupporting

confidence: 74%

Disentangling cosmic-ray and dark-matter inducedγ-rays in galaxy clusters

Maurin¹,

Combet²,

Nezri³

et al. 2012

A&A

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Context. Galaxy clusters are among the best targets for indirect dark matter detection in γ-rays, despite the large astrophysical background expected from these objects. Detection is now within reach of current observatories (Fermi-LAT or Cerenkov telescopes); however, assessing the origin of this signal might be difficult. Aims. We investigate whether the behaviour of the number of objects per "flux" bin (log N − log F) and that of the stacked signal could be used as a signature of the dominant process at stake. Methods. We use the Clumpy code to integrate the signal from decaying or annihilating dark matter and from cosmic rays along the line of sight. We assume the standard Navarro-Frenk-White (NFW) profile for the dark matter density and rely on a parametrised emissivity for the cosmic-ray component. In this context, the consequences of stacking are explored using the MCXC meta-catalogue of galaxy clusters. Results. We find the value of the slope of the log N − log F power law (or the increase of the signal with the number of stacked objects) to be a clear diagnosis to disentangle decaying dark matter from cosmic-ray induced γ-rays. For dark matter annihilation, depending on the signal boost from the substructures, it is either similar to the cosmic-ray signal (no boost) or similar to the decay case (large boosts). The shift between the brightest object and its followers also depends on the signal origin. For annihilation, this shift and the stacked signal are poorly constrained because of the large uncertainty affecting the boost. We also underline that the angular dependence of the annihilation signal is not universal because of the substructure contribution.

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Section: Introductionsupporting

confidence: 74%

Disentangling cosmic-ray and dark-matter inducedγ-rays in galaxy clusters

Maurin¹,

Combet²,

Nezri³

et al. 2012

A&A

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“…The emission detected by the Fermi-LAT is consistent with a point source centered at the nucleus of NGC 1275. The gamma-ray flux measured with Fermi-LAT is almost an order-of-magnitude brighter than the EGRET flux upper limit, F(>100 MeV) < 3.72 × 10 −8 cm −2 s −1 (Reimer et al 2003), and therefore implies that NGC 1275 is varying significantly at gamma-rays on time scales from months to years (see discussion in Abdo et al 2009). …”

Section: Introductionmentioning

confidence: 90%

“…Table 1): component 1 (dashed), 2 (three dots -dashes) and 3 (dot-dash). Data are from NED, from Fermi (Abdo et al 2009) and from MAGIC (Aleksic et al 2010). …”

Section: The Sed Of a Cluster Containing A Central Radio Galaxy: Settmentioning

confidence: 99%

“…Fermi data are from Abdo et al (2009), while the EGRET sensitivity curve corresponds a sensitivity limit of 5σ in 1 year of observation. (Navarro et al 2004), with α = 0.17 and r c equal to the core radius of 200 kpc (the larger core radius of the thermal gas density distribution found by Churazov et al 2003).…”

Section: Dm Modelsmentioning

confidence: 99%

“…The radio-galaxy NGC 1275 (3C 84) has been recently detected by Fermi as a source of high-energy gamma rays with an average flux and power-law photon index of F(>100 MeV) = (2.10 ± 0.23) × 10 −7 cm −2 s −1 and γ = 2.17 ± 0.05, respectively (Abdo et al 2009). The emission detected by the Fermi-LAT is consistent with a point source centered at the nucleus of NGC 1275.…”

Section: Introductionmentioning

confidence: 99%

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Disentangling the gamma-ray emission of NGC 1275 and that of the Perseus cluster

Colafrancesco¹,

Marchegiani²,

Giommi³

2010

A&A

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Context. The Gamma-ray emission from galaxy clusters hosting active galaxies is a complex combination of diffuse and point-like emission features with different spectral and spatial properties. Aims. We discuss in details the case of the Perseus cluster containing the radio-galaxy NGC 1275 that has been recently detected as a bright gamma-ray source by the Fermi-LAT experiment, in order to disentangle the sources of emission. Methods. We provide a detailed study of the gamma-ray emission coming from the core of Perseus by modeling the central AGN emission with a multiple plasma blob model, and the emission from the extended cluster atmosphere with both a warming ray (WR) model and dark matter (DM) neutralino annihilation models. We set constraints on both the central galaxy and cluster SED models by using both archival multi-frequency data and the recent very high energy observations obtained by Fermi and MAGIC. Results. We find that: i) in all the viable models for the cluster gamma-ray emission, the emission detected recently by Fermi from the center of the Perseus cluster is dominated by the active galaxy NGC 1275, that is found in a high-emission state; ii) the diffuse gamma-ray emission of the cluster, in the WR model and in the DM models with the highest allowed normalization, could be detected by Fermi if the central emission from NGC 1275 is in a low-emission state; iii) Fermi can have the possibility to resolve and detect the diffuse gamma-ray flux (predicted by the WR model) coming from the outer corona of the Perseus cluster atmosphere at distances r > ∼ 800 kpc. These results are consistent with the evidence that in the other frequency bands, the diffuse cluster emission dominates on the central galaxy one at low radio frequencies with ν < ∼ 1 GHz and at X-ray energies of order of E ∼ keV. Conclusions. Our results show that a simultaneous study of the various emission mechanisms that produce diffuse gamma-rays from galaxy clusters and the study of the emission mechanisms that produce gamma-rays from active galaxies residing in the cluster atmospheres is absolutely crucial first to disentangle the spectral and spatial characteristics of the gamma-ray emission and secondly to assess the optimal observational strategy in the attempt to reveal the still elusive diffuse gamma-ray emission widely predicted for the atmospheres of large-scale structures.

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Fossil shell emission in dying radio loud AGNs

Kino¹,

Ito

Kawakatu

et al. 2016

Astron Nachr

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We investigate shell emission associated with dying radio loud AGNs. First, based on our recent work by Ito et al. (2015), we describe the dynamical and spectral evolutions of shells after stopping the jet energy injection. We find that the shell emission overwhelms that of the radio lobes soon after stopping the jet energy injection because fresh electrons are continuously supplied into the shell via the forward shock while the radio lobes rapidly fade out without jet energy injection. We find that such fossil shells can be a new class of target sources for SKA telescope. Next, we apply the model to the nearby radio source 3C84. Then, we find that the fossil shell emission in 3C84 is less luminous in radio band while it is bright in TeV gamma-ray band and it can be detectable by CTA.Comment: 5 pages, 5 figures, 1 table, in press for Astronomische Nachrichten. Contribution to the Proceedings of the "Fifth Workshop on Compact Steep Spectrum and GHz-Peaked Spectrum Radio Sources", held in Rimini (Italy) in May 201

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FERMIDISCOVERY OF GAMMA-RAY EMISSION FROM NGC 1275

Cited by 186 publications

References 58 publications

Disentangling cosmic-ray and dark-matter inducedγ-rays in galaxy clusters

Disentangling cosmic-ray and dark-matter inducedγ-rays in galaxy clusters

Disentangling the gamma-ray emission of NGC 1275 and that of the Perseus cluster

Fossil shell emission in dying radio loud AGNs

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