2025RNAAS...9..249D

Query : 2025RNAAS...9..249D

2025RNAAS...9..249D - Research Notes of the AAS, 9, 249 (2025/September-0)

TeV Emission in NGC 4278: Shock Energetics Insufficient, Compact Origin Favored.

DOMINGUEZ A.

Abstract (from CDS):

The Large High Altitude Air Shower Observatory recently detected TeV emission from the low-luminosity active galactic nucleus (LLAGN) NGC 4278. Integral-field spectroscopy with MEGARA revealed ionized outflows on hundred-parsec scales with kinetic power ${\dot{E}}_{{\rm{shock}}}\sim 1{0}^{38}$ erg s^–1, well below the TeV luminosity L_γ ≳ 10⁴¹ erg s^–1. The implied efficiencies, η ≳ 1000, are far above unity, showing that shocks cannot account for the TeV emission. Contemporaneous Fermi-Large Area Telescope and Swift data, consistent with a compact synchrotron self-Compton jet component, favor a nuclear origin. NGC 4278 is the first low-ionization nuclear emission-line region (LINER)/LLAGN of its class detected at TeV energies, a benchmark for LINERs with outflows and a prime target for the Cherenkov Telescope Array Observatory. I conclude that the TeV photons arise from a compact nuclear accelerator, while optical outflows trace larger-scale jet-ISM interactions that coexist but do not power the TeV radiation.

Journal keyword(s): Active galactic nuclei - Gamma-ray sources - Radio jets

Simbad objects: 1

Full paper

View the references in ADS

Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	NGC 4278	LIN	12 20 06.8242	+29 16 50.722	11.54	11.09	10.16			~	988	2

Query : 2025RNAAS...9..249D

Basic data :

NGC 4278 -- LINER-type Active Galaxy Nucleus

LIN (), Rad (2016A&A,B2,...), G (2015ApJS,CASG,...), X (1RXP,RX,...), AGN ([VV2000c],[VV2003c],...), gam (2024ApJS,INTREF,...), GiG ([CHM2007],[TT2002]), smm (JCMTSE,JCMTSF), IR (IRAS,[DML87]), rG (2019ApJ), EmG (KISSR), GiC (CAIRNS), AG? (2020MNRAS), NIR (2MASS), Opt (SDSS)

12 20 06.8242 +29 16 50.722 (Radio) [ 0.15 0.15 0 ] A 2007ApJ...658..203H

12 17 36.1645 +29 33 29.392 [ 0.15 0.15 0 ]

193.7823607 +82.7727395 [ 0.15 0.15 0 ]

V(km/s) 629 [4] / z(emission) 0.002100 [0.000013] / cz 629.66 [4.00] (Rad) C 2022ApJS..261...21Y

E C 2015ApJS..217...27A

3.55858 3.23902 25 (Opt) B 2023ApJS..269....3M

U 11.54 [0.13] D 2007ApJS..173..185G

B 11.09 [0.13] D 2007ApJS..173..185G

V 10.16 [0.13] D 2007ApJS..173..185G

J 8.085 [0.007] C 2006AJ....131.1163S

H 7.415 [0.009] C 2006AJ....131.1163S

K 7.184 [0.011] C 2006AJ....131.1163S

u (AB) 13.377 [0.003] C 2009ApJS..182..543A

g (AB) 10.8245 [0.0023] B 2023ApJS..269....3M

r (AB) 10.0206 [0.0031] B 2023ApJS..269....3M

i (AB) 10.298 [0.001] C 2009ApJS..182..543A

z (AB) 9.4336 [0.0020] B 2023ApJS..269....3M

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Hierarchy : number of linked objects
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`NGC 4278`	`JCMTSE J122006.5+291649`	`RX J1220.1+2916`	`[CHM2007] LDC 867 J122006.79+2916502`
`B2 1217+29`	`JCMTSF J122006.5+291649`	`RX J122006.2+291643`	`[CRJ2004] J1220.1+2916`
`B2.1 1217+29`	`JVAS B1217+295`	`1RXS J122006.2+291643`	`[DC78] UGC 7386`
`B2.2 1217+29`	`JVAS J1220+2916`	`SDSS J122006.82+291650.6`	`[DML87] 655`
`BWE 1217+2933`	`KISS F1220-3863`	`TGSSADR J122006.9+291651`	`[FWB89] Galaxy 247`
`7C 121736.6+293315`	`KISSR 29`	`TIC 328862287`	`[KRN93] 150`
`7C 121736.50+293332.00`	`LEDA 39764`	`TXS 1217+295`	`[LB2005] NGC 4278 X1`
`CAIRNS J122006.82+291650.7`	`1LHAASO J1219+2915`	`UGC 7386`	`[M98c] 121736.5+293326`
`CASG 170`	`2MASS J12200681+2916505`	`UZC J122006.8+291651`	`[SMM2006b] J122006.82+291650.7`
`CRATES J122006+291703`	`2MASX J12200679+2916502`	`VIPS J12201+2916`	`[TT2002] Coma I 2`
`FIRST J122006.8+291650`	`2MASX J12200682+2916498`	`VLSSr J122005.8+291632`	`[VV2000c] J122006.9+291651`
`GB6 B1217+2933`	`MCG+05-29-062`	`WB 1217+2933`	`[VV2003c] J122006.9+291651`
`87GB 121735.6+293357`	`MITG J122007+2916`	`WN B1217.6+2933`	`[VV2006c] J122006.9+291651`
`GLEAM J122006+291709`	`NVSS J122006+291650`	`2XMM J122006.8+291651`	`[VV2010c] J122006.9+291651`
`ICRF J122006.8+291650`	`RGB J1220.1+2916`	`Z 158-77`	`[VV98c] J122006.9+291651`
`IERS B1217+295`	`RGB J1220+292`	`Z 1217.6+2933`	`[WTK2001] J122006.76+291649.8`
`INTREF 487`	`1RXP J122007.2+291646`	`[ATZ98] D106`	`EQ 1217+295`
`IRAS F12176+2933`	`RX J122006+29168`	`[CAB95] IRAS F12176+2933`
`IRAS 12175+2933`	`RX J1220.0+2916`	`[CHM2007] HDC 706 J122006.79+2916502`

References (988 between 1850 and 2026) (Total 988)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : NGC 4278

Link by name to the catalogue in VizieR :

`NGC 4278`	`BWE 1217+2933`	`FIRST J122006.8+291650`	`IERS B1217+295`	`IRAS F12176+2933`
`IRAS 12175+2933`	`2MASS J12200681+2916505`	`2MASX J12200679+2916502`	`2MASX J12200682+2916498`	`MITG J122007+2916`
`NVSS J122006+291650`	`1RXS J122006.2+291643`	`SDSS J122006.82+291650.6`	`UGC 7386`	`WN B1217.6+2933`
`[DML87] 655`

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