2016ApJ...820...72A

Query : 2016ApJ...820...72A

2016ApJ...820...72A - Astrophys. J., 820, 72 (2016/March-3)

Contemporaneous broadband observations of three high-redshift BL Lac objects.

ACKERMANN M., AJELLO M., AN H., BALDINI L., BARBIELLINI G., BASTIERI D., BELLAZZINI R., BISSALDI E., BLANDFORD R.D., BONINO R., BREGEON J., BRITTO R.J., BRUEL P., BUEHLER R., CALIANDRO G.A., CAMERON R.A., CARAGIULO M., CARAVEO P.A., CAVAZZUTI E., CECCHI C., CHARLES E., CHEKHTMAN A., CHIARO G., CIPRINI S., COHEN-TANUGI J., COSTANZA F., CUTINI S., D'AMMANDO F., DE ANGELIS A., DE PALMA F., DESIANTE R., DI MAURO M., DI VENERE L., DOMINGUEZ A., DRELL P.S., FAVUZZI C., FEGAN S.J., FERRARA E.C., FINKE J., FUSCO P., GARGANO F., GASPARRINI D., GIGLIETTO N., GIORDANO F., GIROLETTI M., GREEN D., GRENIER I.A., GUIRIEC S., HORAN D., JOHANNESSON G., KATSURAGAWA M., KUSS M., LARSSON S., LATRONICO L., LI J., LI L., LONGO F., LOPARCO F., LOVELLETTE M.N., LUBRANO P., MAGILL J., MALDERA S., MANFREDA A., MAYER M., MAZZIOTTA M.N., MICHELSON P.F., MIRABAL N., MITTHUMSIRI W., MIZUNO T., MONZANI M.E., MORSELLI A., MOSKALENKO I.V., NEGRO M., NUSS E., OHSUGI T., OKADA C., ORLANDO E., PANEQUE D., PESCE-ROLLINS M., PIRON F., PIVATO G., PORTER T.A., RAINO S., RANDO R., RAZZANO M., REIMER O., RAU A., ROMANI R.W., SCHADY P., SGRO C., SIMONE D., SISKIND E.J., SPADA F., SPANDRE G., SPINELLI P., STERN D., TAKAHASHI H., THAYER J.B., TORRES D.F., TOSTI G., TROJA E., VIANELLO G., WOOD K.S. and WOOD M.

Abstract (from CDS):

We have collected broadband spectral energy distributions (SEDs) of three BL Lac objects 3FGL J0022.1-1855 (z = 0.689), 3FGL J0630.9-2406 (z  ≳1.239), and 3FGL J0811.2-7529 (z = 0.774), detected by Fermi with relatively flat gigaelectronvolt spectra. By observing simultaneously in the near-infrared to hard X-ray band, we can well characterize the high end of the synchrotron component of the SED. Thus, fitting the SEDs to synchro-Compton models of the dominant emission from the relativistic jet, we can constrain the underlying particle properties and predict the shape of the gigaelectronvolt Compton component. Standard extragalactic background light (EBL) models explain the high-energy absorption well, with poorer fits for high-ultraviolet models. The fits show clear evidence for EBL absorption in the Fermi spectrum of our highest-redshift source 3FGL J0630.9-2406. While synchrotron self-Compton models adequately describe the SEDs, the situation may be complicated by possible external Compton components. For 3FGL J0811.2-7529, we also discover a nearby serendipitous source in the X-ray data, which is almost certainly another lower synchrotron peak frequency (νpksy) BL Lac, that may contribute flux in the Fermi band. Since our sources are unusual high-luminosity, moderate νpksy BL Lacs, we compare these quantities and the Compton dominance, the ratio of peak inverse Compton to peak synchrotron luminosities (LpkIC/Lpksy), with those of the full Fermi BL Lac population.

Abstract Copyright: ∼

Journal keyword(s): BL Lacertae objects: general - BL Lacertae objects: individual: (3FGL J0022.1-1855, 3FGL J0630.9-2406, 3FGL J0811.2-7529) - galaxies: active - radiation mechanisms: non-thermal

Simbad objects: 4

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Number of rows : 4
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 ATO J005.5386-18.8930 BLL 00 22 09.2686975344 -18 53 34.868121432 17.48 17.20 16.97     ~ 52 1
2 PMN J0630-2406 BLL 06 30 59.5217586120 -24 06 46.204083144 16.48 16.22 16.04 16   ~ 97 1
3 1RXS J081001.1-752709 AGN 08 10 03.3097479299 -75 27 23.711241083           ~ 5 0
4 2FGL J0811.1-7527 BLL 08 11 03.2072676624 -75 30 27.821206116 17.74 17.50 17.48 17.2   ~ 60 1

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