2017A&A...598A..39H

C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST06:50:28

2017A&A...598A..39H - Astronomy and Astrophysics, volume 598A, 39-39 (2017/2-1)

Characterizing the γ-ray long-term variability of PKS 2155-304 with H.E.S.S. and Fermi-LAT.

HESS COLLABORATION, ABDALLA H., ABRAMOWSKI A., AHARONIAN F., AIT BENKHALI F., AKHPERJANIAN A.G., ANDERSSON T., ANGUNER E.O., ARRIETA M., AUBERT P., BACKES M., BALZER A., BARNARD M., BECHERINI Y., BECKER TJUS J., BERGE D., BERNHARD S., BERNLOHR K., BLACKWELL R., BOTTCHER M., BOISSON C., BOLMONT J., BORDAS P., BREGEON J., BRUN F., BRUN P., BRYAN M., BULIK T., CAPASSO M., CARR J., CASANOVA S., CERRUTI M., CHAKRABORTY N., CHALME-CALVET R., CHAVES R.C.G., CHEN A., CHEVALIER J., CHRETIEN M., COLAFRANCESCO S., COLOGNA G., CONDON B., CONRAD J., CUI Y., DAVIDS I.D., DECOCK J., DEGRANGE B., DEIL C., DEVIN J., DEWILT P., DIRSON L., DJANNATI-ATAI A., DOMAINKO W., DONATH A., DRURY L.O., DUBUS G., DUTSON K., DYKS J., EDWARDS T., EGBERTS K., EGER P., ERNENWEIN J.-P., ESCHBACH S., FARNIER C., FEGAN S., FERNANDES M.V., FIASSON A., FONTAINE G., FORSTER A., FUNK S., FUSSLING M., GABICI S., GAJDUS M., GALLANT Y.A., GARRIGOUX T., GIAVITTO G., GIEBELS B., GLICENSTEIN J.F., GOTTSCHALL D., GOYAL A., GRONDIN M.-H., HADASCH D., HAHN J., HAUPT M., HAWKES J., HEINZELMANN G., HENRI G., HERMANN G., HERVET O., HINTON J.A., HOFMANN W., HOISCHEN C., HOLLER M., HORNS D., IVASCENKO A., JACHOLKOWSKA A., JAMROZY M., JANIAK M., JANKOWSKY D., JANKOWSKY F., JINGO M., JOGLER T., JOUVIN L., JUNG-RICHARDT I., KASTENDIECK M.A., KATARZYNSKI K., KATZ U., KERSZBERG D., KHELIFI B., KIEFFER M., KING J., KLEPSER S., KLOCHKOV D., KLUZNIAK W., KOLITZUS D., KOMIN N., KOSACK K., KRAKAU S., KRAUS M., KRAYZEL F., KRUGER P.P., LAFFON H., LAMANNA G., LAU J., LEES J.-P., LEFAUCHEUR J., LEFRANC V., LEMIERE A., LEMOINE-GOUMARD M., LENAIN J.-P., LESER E., LOHSE T., LORENTZ M., LIU R., LOPEZ-COTO R., LYPOVA I., MARANDON V., MARCOWITH A., MARIAUD C., MARX R., MAURIN G., MAXTED N., MAYER M., MEINTJES P.J., MEYER M., MITCHELL A.M.W., MODERSKI R., MOHAMED M., MOHRMANN L., MORA K., MOULIN E., MURACH T., DE NAUROIS M., NIEDERWANGER F., NIEMIEC J., OAKES L., O'BRIEN P., ODAKA H., OTTL S., OHM S., OSTROWSKI M., OYA I., PADOVANI M., PANTER M., PARSONS R.D., PEKEUR N.W., PELLETIER G., PERENNES C., PETRUCCI P.-O., PEYAUD B., PIEL Q., PITA S., POON H., PROKHOROV D., PROKOPH H., PUHLHOFER G., PUNCH M., QUIRRENBACH A., RAAB S., REIMER A., REIMER O., RENAUD M., DE LOS REYES R., RIEGER F., ROMOLI C., ROSIER-LEES S., ROWELL G., RUDAK B., RULTEN C.B., SAHAKIAN V., SALEK D., SANCHEZ D.A., SANTANGELO A., SASAKI M., SCHLICKEISER R., SCHUSSLER F., SCHULZ A., SCHWANKE U., SCHWEMMER S., SETTIMO M., SEYFFERT A.S., SHAFI N., SHILON I., SIMONI R., SOL H., SPANIER F., SPENGLER G., SPIES F., STAWARZ L., STEENKAMP R., STEGMANN C., STINZING F., STYCZ K., SUSHCH I., TAVERNET J.-P., TAVERNIER T., TAYLOR A.M., TERRIER R., TIBALDO L., TIZIANI D., TLUCZYKONT M., TRICHARD C., TUFFS R., UCHIYAMA Y., VAN DER WALT D.J., VAN ELDIK C., VAN RENSBURG C., VAN SOELEN B., VASILEIADIS G., VEH J., VENTER C., VIANA A., VINCENT P., VINK J., VOISIN F., VOLK H.J., VUILLAUME T., WADIASINGH Z., WAGNER S.J., WAGNER P., WAGNER R.M., WHITE R., WIERZCHOLSKA A., WILLMANN P., WORNLEIN A., WOUTERS D., YANG R., ZABALZA V., ZABOROV D., ZACHARIAS M., ZDZIARSKI A.A., ZECH A., ZEFI F., ZIEGLER A. and ZYWUCKA N.

Abstract (from CDS):

Studying the temporal variability of BL Lac objects at the highest energies provides unique insights into the extreme physical processes occurring in relativistic jets and in the vicinity of super-massive black holes. To this end, the long-term variability of the BL Lac object PKS 2155-304 is analyzed in the high (HE, 100MeV<E<300GeV) and very high energy (VHE, E>200GeV) γ-ray domain. Over the course of ∼9yr of H.E.S.S. observations the VHE light curve in the quiescent state is consistent with a log-normal behavior. The VHE variability in this state is well described by flicker noise (power-spectral-density index β_VHE=1.10^+0.10_–0.13) on timescales larger than one day. An analysis of ∼5.5yr of HE Fermi-LAT data gives consistent results (β_HE=1.20^+0.21_–0.23, on timescales larger than 10 days) compatible with the VHE findings. The HE and VHE power spectral densities show a scale invariance across the probed time ranges. A direct linear correlation between the VHE and HE fluxes could neither be excluded nor firmly established. These long-term-variability properties are discussed and compared to the red noise behavior (β∼2) seen on shorter timescales during VHE-flaring states. The difference in power spectral noise behavior at VHE energies during quiescent and flaring states provides evidence that these states are influenced by different physical processes, while the compatibility of the HE and VHE long-term results is suggestive of a common physical link as it might be introduced by an underlying jet-disk connection.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: active - BL Lacertae objects: individual: PKS 2155-304 - gamma rays: galaxies - galaxies: jets - galaxies: nuclei - radiation mechanisms: non-thermal

Simbad objects: 9

Full paper

View the reference in ADS

Number of rows : 9

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2020	#notes
1	3C 111	Sy1	04 18 21.2773655604	+38 01 35.801523843		19.75	18.05		~	856	1
2	Mrk 1506	Sy1	04 33 11.0958197353	+05 21 15.617543663		15.72	15.05	10.08	~	1841	2
3	2MASX J13251937-3824524	Sy1	13 25 19.3805503234	-38 24 52.611897329		16.64	13.80	15.33	~	339	0
4	4C 39.49	BLL	16 53 52.21668494	+39 45 36.6089458	14.09	14.15	13.29	8.26	~	1914	2
5	[VV2006] J215121.9-274224	QSO	21 51 21.90509173	-27 42 23.0089538		19.76	19.69	19.11	~	32	0
6	QSO B2149-306	QSO	21 51 55.52398143	-30 27 53.6979987		17.95	18.0	17.48	~	220	1
7	QSO B2155-304	BLL	21 58 52.0651817803	-30 13 32.120657891		13.36	13.09	12.62	~	1564	1
8	3FHL J2159.2-2840	BLL	21 59 16	-28 41.2					~	10	0
9	NAME BL Lac	BLL	22 02 43.2913773726	+42 16 39.978417860		15.66	14.72		~	2006	1

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