1999A&A...343..691R

Query : 1999A&A...343..691R

1999A&A...343..691R - Astronomy and Astrophysics, volume 343691-696 (1999/3-3)

TeV gamma-ray observations of three X-ray selected BL Lacs.

ROBERTS M.D., McGEE P., DAZELEY S.A., EDWARDS P.G., HARA T., HOLDER J., KAWACHI A., KIFUNE T., MATSUBARA Y., MIZUMOTO Y., MORI M., MURAISHI H., MURAKI Y., NAITO T., NISHIJIMA K., OGIO S., OSAKI T., PATTERSON J.R., ROWELL G.P., SAKO T., SAKURAZAWA K., SUSUKITA R., TAMURA T., TANIMORI T., THORNTON G.J., YANAGITA S., YOSHIDA T. and YOSHIKOSHI T.

Abstract (from CDS):

Despite extensive surveys of extragalactic TeV gamma-ray candidates only 3 sources have so far been detected. All three are northern hemisphere objects and all three are low-redshift X-ray selected BL Lacs (XBLs). In this paper we present the results of observations of the three nearest southern hemisphere XBLs (PKS 0548-322, PKS 2005-489 and PKS 2155-304) with the CANGAROO 3.8m imaging telescope. During the period of observation we estimate that the threshold of the 3.8m telescope was ∼1.5TeV. Searches for both steady and short timescale emission have been performed for each source. Additionally, we are able to monitor the X-ray state of each source on a daily basis and we have made contemporaneous measurements of optical activity for PKS 0548-322 and PKS 2155-304.

Abstract Copyright: ∼

Journal keyword(s): gamma rays: observations - galaxies: BL Lacertae objects: individual: PKS 0548-322, PKS 2005-489, PKS 2155-304

Simbad objects: 6

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Number of rows : 6
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 PKS J0550-3216 BLL 05 50 40.5705144672 -32 16 16.484718648   16.07 15.5     ~ 424 1
2 Z 184-50 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2841 1
3 Z 225-7 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2304 2
4 PKS J2009-4849 BLL 20 09 25.3903899240 -48 49 53.725051056   15.75 12.81 11.41   ~ 604 1
5 PKS J2158-3013 BLL 21 58 52.0652249880 -30 13 32.118447792   13.36 13.09 12.62   ~ 1829 1
6 QSO B2344+514 BLL 23 47 04.8372110928 +51 42 17.877513168     15.50 10.7   ~ 500 1

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