Related papers: EUV excess in the inner Virgo cluster

CANGAROO-III search for TeV Gamma-rays from two clusters of galaxies

Because accretion and merger shocks in clusters of galaxies may accelerate particles to high energies, clusters are candidate sites for the origin of ultra-high-energy (UHE) cosmic-rays. A prediction was presented for gamma-ray emission…

High Energy Astrophysical Phenomena · Physics 2015-05-14 R. Kiuchi , M. Mori , G. V. Bicknell , R. W. Clay , P. G. Edwards , R. Enomoto , S. Gunji , S. Hara , T. Hara , T. Hattori , S. Hayashi , Y. Higashi , Y. Hirai , K. Inoue , C. Itoh , S. Kabuki , F. Kajino , H. Katagiri , A. Kawachi , T. Kifune , H. Kubo , J. Kushida , Y. Matsubara , T. Mizukami , Y. Mizumoto , R. Mizuniwa , H. Muraishi , Y. Muraki , T. Naito , T. Nakamori , S. Nakano , D. Nishida , K. Nishijima , M. Ohishi , Y. Sakamoto , A. Seki , V. Stamatescu , T. Suzuki , D. L. Swaby , T. Tanimori , G. Thornton , F. Tokanai , K. Tsuchiya , S. Watanabe , Y. Yamada , E. Yamazaki , S. Yanagita , T. Yoshida , T. Yoshikoshi , Y. Yukawa

An upper limit on the ratio between the Extreme Ultraviolet and the bolometric luminosities of stars hosting habitable planets

A large number of terrestrial planets in the classical habitable zone of stars of different spectral types has already been discovered and many are expected to be discovered in near future. However, owing to the lack of knowledge on the…

Solar and Stellar Astrophysics · Physics 2016-04-27 Sujan Sengupta

High-resolution X-ray spectroscopy with XRISM/Resolve reveals super-Solar abundance ratios in Virgo/M87

The chemical composition of the intracluster medium (ICM) provides key insights into the enrichment history of galaxy clusters. However, high-resolution abundance measurements with X-ray microcalorimeters remain available for only a few…

Astrophysics of Galaxies · Physics 2026-05-20 J. Martin , A. Simionescu , F. Mernier , C. Kilbourne , A. Tümer , H. R. Russell , M. Charbonneau , N. Dizdar , D. Eckert , Y. Ezoe , R. Fujimoto , M. Fujita , K. Fukushima , L. Gu , E. Hodges-Kluck , Y. Ichinohe , D. Ito , S. Kitamoto , M. A. Leutenegger , M. Loewenstein , H. McCall , B. R. McNamara , E. D. Miller , I. Mitsuishi , K. Nakazawa , A. Ogorzalek , K. Sato , A. Szymkowiak , I. Zhuravleva

The Herschel Virgo Cluster Survey: VI. The far-infrared view of M87

The origin of the far-infrared emission from the nearby radio galaxy M87 remains a matter of debate. Some studies find evidence of a far-infrared excess due to thermal dust emission, whereas others propose that the far-infrared emission can…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 M. Baes , M. Clemens , E. M. Xilouris , J. Fritz , W. D. Cotton , J. I. Davies , G. J. Bendo , S. Bianchi , L. Cortese , I. De Looze , M. Pohlen , J. Verstappen , H. Boehringer , D. J. Bomans , A. Boselli , E. Corbelli , A. Dariush , S. di Serego Alighieri , D. Fadda , D. A. Garcia-Appadoo , G. Gavazzi , C. Giovanardi , M. Grossi , T. M. Hughes , L. K. Hunt , A. P. Jones , S. Madden , D. Pierini , S. Sabatini , M. W. L. Smith , C. Vlahakis , S. Zibetti

Hot Populations in M87 Globular Clusters

We have obtained HST/STIS far- and near-UV photometry of globular clusters in four fields in the gE galaxy M87. To a limit of m(FUV) = 25 we detect a total of 66 globular clusters (GCs) in common with the deep HST optical-band study of…

Astrophysics · Physics 2009-11-11 S. T. Sohn , R. W. O'Connell , A. Kundu , W. B. Landsman , D. Burstein , R. C. Bohlin , J. A. Frogel , J. A. Rose

Detection of very high-energy gamma-ray emission from the radio galaxy M87 with LHAASO

The nearby radio galaxy M87 is a very-high-energy (VHE) gamma-ray emitter established by observations with ground-based gamma-ray detectors. Here we report the long-term monitoring of M87 from 2021 to 2024 with Large High Altitude Air…

High Energy Astrophysical Phenomena · Physics 2025-12-29 Zhen Cao , F. Aharonian , Axikegu , Y. X. Bai , Y. W. Bao , D. Bastieri , X. J. Bi , Y. J. Bi , W. Bian , A. V. Bukevich , Q. Cao , W. Y. Cao , Zhe Cao , J. Chang , J. F. Chang , A. M. Chen , E. S. Chen , H. X. Chen , Liang Chen , Lin Chen , Long Chen , M. J. Chen , M. L. Chen , Q. H. Chen , S. Chen , S. H. Chen , S. Z. Chen , T. L. Chen , Y. Chen , N. Cheng , Y. D. Cheng , M. C. Chu , M. Y. Cui , S. W. Cui , X. H. Cui , Y. D. Cui , B. Z. Dai , H. L. Dai , Z. G. Dai , Danzengluobu , X. Q. Dong , K. K. Duan , J. H. Fan , Y. Z. Fan , J. Fang , J. H. Fang , K. Fang , C. F. Feng , H. Feng , L. Feng , S. H. Feng , X. T. Feng , Y. Feng , Y. L. Feng , S. Gabici , B. Gao , C. D. Gao , Q. Gao , W. Gao , W. K. Gao , M. M. Ge , T. T. Ge , L. S. Geng , G. Giacinti , G. H. Gong , Q. B. Gou , M. H. Gu , F. L. Guo , J. Guo , X. L. Guo , Y. Q. Guo , Y. Y. Guo , Y. A. Han , O. A. Hannuksela , M. Hasan , H. H. He , H. N. He , J. Y. He , Y. He , Y. K. Hor , B. W. Hou , C. Hou , X. Hou , H. B. Hu , Q. Hu , S. C. Hu , C. Huang , D. H. Huang , T. Q. Huang , W. J. Huang , X. T. Huang , X. Y. Huang , Y. Huang , Y. Y. Huang , X. L. Ji , H. Y. Jia , K. Jia , H. B. Jiang , K. Jiang , X. W. Jiang , Z. J. Jiang , M. Jin , M. M. Kang , I. Karpikov , D. Khangulyan , D. Kuleshov , K. Kurinov , B. B. Li , C. M. Li , Cheng Li , Cong Li , D. Li , F. Li , H. B. Li , H. C. Li , Jian Li , Jie Li , K. Li , S. D. Li , W. L. Li , W. L. Li , X. R. Li , Xin Li , Y. Z. Li , Zhe Li , Zhuo Li , E. W. Liang , Y. F. Liang , S. J. Lin , B. Liu , C. Liu , D. Liu , D. B. Liu , H. Liu , H. D. Liu , J. Liu , J. L. Liu , M. Y. Liu , R. Y. Liu , S. M. Liu , W. Liu , Y. Liu , Y. N. Liu , Q. Luo , Y. Luo , H. K. Lv , B. Q. Ma , L. L. Ma , X. H. Ma , J. R. Mao , Z. Min , W. Mitthumsiri , H. J. Mu , Y. C. Nan , A. Neronov , K. C. Y. Ng , L. J. Ou , P. Pattarakijwanich , Z. Y. Pei , J. C. Qi , M. Y. Qi , B. Q. Qiao , J. J. Qin , A. Raza , D. Ruffolo , A. Sáiz , M. Saeed , D. Semikoz , L. Shao , O. Shchegolev , X. D. Sheng , F. W. Shu , H. C. Song , Yu. V. Stenkin , V. Stepanov , Y. Su , D. X. Sun , Q. N. Sun , X. N. Sun , Z. B. Sun , J. Takata , P. H. T. Tam , Q. W. Tang , R. Tang , Z. B. Tang , W. W. Tian , L. H. Wan , C. Wang , C. B. Wang , G. W. Wang , H. G. Wang , H. H. Wang , J. C. Wang , Kai Wang , Kai Wang , L. P. Wang , L. Y. Wang , P. H. Wang , R. Wang , W. Wang , X. G. Wang , X. Y. Wang , Y. Wang , Y. D. Wang , Y. J. Wang , Z. H. Wang , Z. X. Wang , Zhen Wang , Zheng Wang , D. M. Wei , J. J. Wei , Y. J. Wei , T. Wen , C. Y. Wu , H. R. Wu , Q. W. Wu , S. Wu , X. F. Wu , Y. S. Wu , S. Q. Xi , J. Xia , G. M. Xiang , D. X. Xiao , G. Xiao , Y. L. Xin , Y. Xing , D. R. Xiong , Z. Xiong , D. L. Xu , R. F. Xu , R. X. Xu , W. L. Xu , L. Xue , D. H. Yan , J. Z. Yan , T. Yan , C. W. Yang , C. Y. Yang , F. Yang , F. F. Yang , L. L. Yang , M. J. Yang , R. Z. Yang , W. X. Yang , Y. H. Yao , Z. G. Yao , L. Q. Yin , N. Yin , X. H. You , Z. Y. You , Y. H. Yu , Q. Yuan , H. Yue , H. D. Zeng , T. X. Zeng , W. Zeng , M. Zha , B. B. Zhang , F. Zhang , H. Zhang , H. M. Zhang , H. Y. Zhang , J. L. Zhang , Li Zhang , P. F. Zhang , P. P. Zhang , R. Zhang , S. B. Zhang , S. R. Zhang , S. S. Zhang , X. Zhang , X. P. Zhang , Y. F. Zhang , Yi Zhang , Yong Zhang , B. Zhao , J. Zhao , L. Zhao , L. Z. Zhao , S. P. Zhao , X. H. Zhao , F. Zheng , W. J. Zhong , B. Zhou , H. Zhou , J. N. Zhou , M. Zhou , P. Zhou , R. Zhou , X. X. Zhou , X. X. Zhou , B. Y. Zhu , C. G. Zhu , F. R. Zhu , H. Zhu , K. J. Zhu , Y. C. Zou , X. Zuo

Predicting the Extreme Ultraviolet Radiation Environment of Exoplanets Around Low-Mass Stars: GJ 832, GJ 176, GJ 436

Correct estimates of stellar extreme ultraviolet (EUV; 100 - 1170 \AA) flux are important for studying the photochemistry and stability of exoplanet atmospheres, as EUV radiation ionizes hydrogen and contributes to the heating, expansion,…

Solar and Stellar Astrophysics · Physics 2020-01-08 Sarah Peacock , Travis Barman , Evgenya Shkolnik , Peter Hauschildt , E. Baron , Birgit Fuhrmeister

Extremely Large EUV Late Phase of Solar Flares

The second peak in the Fe XVI 33.5 nm line irradiance observed during solar flares by Extreme ultraviolet Variability Experiment (EVE) is known as Extreme UltraViolet (EUV) late phase. Our previous paper (Liu et al. 2013) found that the…

Solar and Stellar Astrophysics · Physics 2015-04-22 Kai Liu , Yuming Wang , Jie Zhang , Xin Cheng , Rui Liu , Chenglong Shen

Detection of an X-Ray Hot Region in the Virgo Cluster of Galaxies with ASCA

Based on mapping observations with ASCA, an unusual hot region with a spatial extent of 1 square degree was discovered between M87 and M49 at a center coordinate of R. A. = 12h 27m 36s and Dec. = $9^\circ18'$ (J2000). The X-ray emission…

Astrophysics · Physics 2009-10-31 K. Kikuchi , C. Itoh , A. Kushino , T. Furusho , K. Matsushita , N. Y. Yamasaki , T. Ohashi , Y. Fukazawa , Y. Ikebe , H. Boehringer , H. Matsumoto

Constraints Imposed by a High Magnetic Field on Models for the EUV Emission in the Coma Cluster

A variety of models have been explored in regard to the origin of the excess extreme ultraviolet (~ 0.1 keV) emission in the Coma cluster. It is now established that the flux is non-thermal and the only non-thermal source mechanism that…

Astrophysics · Physics 2007-05-23 Ming Yann Tsay , Chorng-Yuan Hwang , Stuart Bowyer

Modeling the non-flaring VHE emission from M87 as detected by the HAWC gamma ray observatory

M87 is a giant radio galaxy located in the Virgo Cluster, known to be a very high energy (VHE) gamma-ray source. As radio galaxies are considered the misaligned low-redshift counterparts of blazars, they are excellent laboratories for…

High Energy Astrophysical Phenomena · Physics 2021-08-03 Fernando Ureña-Mena , Alberto Carramiñana , Anna Lia Longinotti , Daniel Rosa-González

Monitoring of the radio galaxy M87 during a low emission state from 2012 to 2015 with MAGIC

M87 is one of the closest (z=0.00436) extragalactic sources emitting at very-high-energies (VHE, E > 100 GeV). The aim of this work is to locate the region of the VHE gamma-ray emission and to describe the observed broadband spectral energy…

High Energy Astrophysical Phenomena · Physics 2020-08-04 MAGIC Collaboration , V. A. Acciari , S. Ansoldi , L. A. Antonelli , A. Arbet Engels , C. Arcaro , D. Baack , A. Babić , B. Banerjee , P. Bangale , U. Barres de Almeida , J. A. Barrio , J. Becerra González , W. Bednarek , L. Bellizzi , E. Bernardini , A. Berti , J. Besenrieder , W. Bhattacharyya , C. Bigongiari , A. Biland , O. Blanch , G. Bonnoli , Ž. Bošnjak , G. Busetto , R. Carosi , G. Ceribella , Y. Chai , A. Chilingaryan , S. Cikota , S. M. Colak , U. Colin , E. Colombo , J. L. Contreras , J. Cortina , S. Covino , V. D'Elia , P. Da Vela , F. Dazzi , A. De Angelis , B. De Lotto , M. Delfino , J. Delgado , D. Depaoli , F. Di Pierro , L. Di Venere , E. Do Souto Espiñeira , D. Dominis Prester , A. Donini , D. Dorner , M. Doro , D. Elsaesser , V. Fallah Ramazani , A. Fattorini , A. Fernández-Barral , G. Ferrara , D. Fidalgo , L. Foffano , M. V. Fonseca , L. Font , C. Fruck , S. Fukami , R. J. García López , M. Garczarczyk , S. Gasparyan , M. Gaug , N. Giglietto , F. Giordano , N. Godinović , D. Green , D. Guberman , D. Hadasch , A. Hahn , J. Herrera , J. Hoang , D. Hrupec , M. Hütten , T. Inada , S. Inoue , K. Ishio , Y. Iwamura , L. Jouvin , D. Kerszberg , H. Kubo , J. Kushida , A. Lamastra , D. Lelas , F. Leone , E. Lindfors , S. Lombardi , F. Longo , M. López , R. López-Coto , A. López-Oramas , S. Loporchio , B. Machado de Oliveira Fraga , C. Maggio , P. Majumdar , M. Makariev , M. Mallamaci , G. Maneva , M. Manganaro , K. Mannheim , L. Maraschi , M. Mariotti , M. Martínez , S. Masuda , D. Mazin , S. Mićanović , D. Miceli , M. Minev , J. M. Miranda , R. Mirzoyan , E. Molina , A. Moralejo , D. Morcuende , V. Moreno , E. Moretti , P. Munar-Adrover , V. Neustroev , C. Nigro , K. Nilsson , D. Ninci , K. Nishijima , K. Noda , L. Nogués , M. Nöthe , S. Nozaki , S. Paiano , J. Palacio , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , P. Peñil , M. Peresano , M. Persic , P. G. Prada Moroni , E. Prandini , I. Puljak , W. Rhode , M. Ribó , J. Rico , C. Righi , A. Rugliancich , L. Saha , N. Sahakyan , T. Saito , S. Sakurai , K. Satalecka , K. Schmidt , T. Schweizer , J. Sitarek , I. Šnidarić , D. Sobczynska , A. Somero , A. Stamerra , D. Strom , M. Strzys , Y. Suda , T. Surić , M. Takahashi , F. Tavecchio , P. Temnikov , T. Terzić , M. Teshima , N. Torres-Albà , L. Tosti , S. Tsujimoto , V. Vagelli , J. van Scherpenberg , G. Vanzo , M. Vazquez Acosta , C. F. Vigorito , V. Vitale , I. Vovk , M. Will , D. Zarić , MWL Collaborators , : , K. Asano , K. Hada , D. E. Harris , M. Giroletti , H. E. Jermak , J. P. Madrid , F. Massaro , S. Richter , F. Spanier , I. A. Steele , R. C. Walker

Extremely energetic EUV late phase of a pair of C-class flares caused by a non-eruptive sigmoid

The EUV late phase is the second increase of the irradiance of the warm coronal lines during solar flares, and has a crucial impact on the Earth's ionosphere. In this paper, we report on the extremely energetic EUV late phase of a pair of…

Solar and Stellar Astrophysics · Physics 2025-12-10 Ya Wang , Sargam M. Mulay , Lyndsay Fletcher

Combined fit above 0.1 EeV to the cosmic-ray spectrum and composition measured with the Pierre Auger Observatory

We fit the cosmic-ray spectrum measured with the Pierre Auger Observatory's surface detectors above an energy of $10^{17}$ eV, along with composition information inferred from the depth of shower maximum measured with its fluorescence…

High Energy Astrophysical Phenomena · Physics 2025-07-25 Esteban Roulet

Intracluster Red Giant Stars in the Virgo Cluster

We have used the WFPC2 camera of the Hubble Space Telescope to obtain deep F814W images of a blank field in the Virgo Cluster located 41 arcmin northwest of M87. We perform star counts in that field, and in another Virgo field observed by…

Astrophysics · Physics 2009-11-07 Patrick R. Durrell , Robin Ciardullo , John J. Feldmeier , George H. Jacoby , Steinn Sigurdsson

HAZMAT VI: The Evolution of Extreme Ultraviolet Radiation Emitted from Early M Star

Quantifying the evolution of stellar extreme ultraviolet (EUV, 100 -- 1000 $\overset{\circ}{A}$) emission is critical for assessing the evolution of planetary atmospheres and the habitability of M dwarf systems. Previous studies from the…

Solar and Stellar Astrophysics · Physics 2020-05-27 Sarah Peacock , Travis Barman , Evgenya L. Shkolnik , R. O. Parke Loyd , Adam C. Schneider , Isabella Pagano , Victoria S. Meadows

Extreme-Ultraviolet Wave and Accompanying Loop Oscillations

We present the observations of an extreme-ultraviolet (EUV) wave, which originated from the active region (AR) NOAA 12887 on 28 October 2021 and its impact on neighbouring loops. The event was observed by the Atmospheric Imaging Assembly…

Solar and Stellar Astrophysics · Physics 2022-12-21 Pooja Devi , Ramesh Chandra , Arun Kumar Awasthi , Brigitte Schmieder , Reetika Joshi

Hubble Space Telescope FUV observations of M31's globular clusters suggest a spatially homogeneous helium-enriched sub population

We present high spatial resolution, far ultraviolet (FUV) F140LP observations of 12 massive globular clusters in M 31 obtained using the ACS/SBC on the Hubble Space Telescope (HST). These observations resolve the cluster profiles to scales…

Astrophysics of Galaxies · Physics 2018-09-19 Mark Peacock , Stephen Zepf , Thomas Maccarone , Arunav Kundu , Christian Knigge , Andrea Dieball , Jay Strader

The complex gamma-ray behaviour of the Radio Galaxy M87

Context.In recent years, non-blazar Active Galactic Nuclei (AGN) such as Radio Galaxies have emerged as a highly instructive source class providing unique insights into high energy acceleration and radiation mechanisms. Aims.Here we aim at…

High Energy Astrophysical Phenomena · Physics 2019-02-27 Faiçal Ait Benkhali , Nachiketa Chakraborty , Frank M. Rieger

Ultraviolet stellar population of the old open cluster M67 (NGC 2682)

We present the results of ultraviolet (UV) photometry of the old open cluster M67 obtained using Galaxy Evolution Explorer (GALEX) in far-ultraviolet (FUV) and near-ultraviolet (NUV) bands. UV detections of 18 blue straggler stars (BSSs), 3…

Solar and Stellar Astrophysics · Physics 2018-09-12 Sindhu N , Annapurni Subramaniam , C Anu Radha