Comparison of X-ray- and radio-selected bl lacertae objects in high-energy gamma-ray observations

Y. C. Lin; D. L. Bertsch; B. L. Dingus; J. A. Esposito; C. E. Fichtel; R. C. Hartman; S. D. Hunter; G. Kanbach; D. A. Kniffen; J. R. Mattox; H. A. Mayer-Hasselwander; P. F. Michelson; C. Von Montigny; R. Mukherjee; P. L. Nolan; E. J. Schneid; P. Sreekumar; D. J. Thompson; T. D. Willis

doi:10.1086/310494

Comparison of X-ray- and radio-selected bl lacertae objects in high-energy gamma-ray observations

Y. C. Lin^*, D. L. Bertsch, B. L. Dingus, J. A. Esposito, C. E. Fichtel, R. C. Hartman, S. D. Hunter, G. Kanbach, D. A. Kniffen, J. R. Mattox, H. A. Mayer-Hasselwander, P. F. Michelson, C. Von Montigny, R. Mukherjee, P. L. Nolan, E. J. Schneid, P. Sreekumar, D. J. Thompson, T. D. Willis

^*Corresponding author for this work

Manipal Centre for Natural Sciences, Manipal

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

In the course of the Compton Gamma Ray Observatory mission, the EGRET telescope has detected 14 BL Lacertae objects in high-energy gamma rays through Phase 4. According to the BL Lac sample in Ciliegi, Bassani, & Caroli, two of these 14 sources are X-ray selected (XBL) and 10 are radio-selected (RBL); two are not listed in this sample. An examination of the radio fluxes and the X-ray fluxes for the BL Lac objects detected by EGRET reveals that it seems a strong radio flux must be present if high-energy gamma rays are to be detected in a BL Lac object, while detection is independent of the X-ray flux of the source. This result is in agreement with the picture of the coaligned radio jet and X-ray jet model of the broadband properties of BL Lac objects. For the BL Lac objects listed in Ciliegi et al. that are not detected by EGRET, co-adding of the EGRET data for the undetected RBLs in such a way that the source positions coincide with each other yields a flux excess at a 3.5 σ level, but similar co-adding of the EGRET data for the undetected XBLs yields no flux excess.

Original language	English
Pages (from-to)	L11-L14
Journal	Astrophysical Journal
Volume	476
Issue number	1 PART II
DOIs	https://doi.org/10.1086/310494
Publication status	Published - 1997

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1086/310494

Cite this

Lin, Y. C., Bertsch, D. L., Dingus, B. L., Esposito, J. A., Fichtel, C. E., Hartman, R. C., Hunter, S. D., Kanbach, G., Kniffen, D. A., Mattox, J. R., Mayer-Hasselwander, H. A., Michelson, P. F., Von Montigny, C., Mukherjee, R., Nolan, P. L., Schneid, E. J., Sreekumar, P., Thompson, D. J., & Willis, T. D. (1997). Comparison of X-ray- and radio-selected bl lacertae objects in high-energy gamma-ray observations. Astrophysical Journal, 476(1 PART II), L11-L14. https://doi.org/10.1086/310494

@article{5c46da3cd98545619a56133eb924989b,

title = "Comparison of X-ray- and radio-selected bl lacertae objects in high-energy gamma-ray observations",

abstract = "In the course of the Compton Gamma Ray Observatory mission, the EGRET telescope has detected 14 BL Lacertae objects in high-energy gamma rays through Phase 4. According to the BL Lac sample in Ciliegi, Bassani, \& Caroli, two of these 14 sources are X-ray selected (XBL) and 10 are radio-selected (RBL); two are not listed in this sample. An examination of the radio fluxes and the X-ray fluxes for the BL Lac objects detected by EGRET reveals that it seems a strong radio flux must be present if high-energy gamma rays are to be detected in a BL Lac object, while detection is independent of the X-ray flux of the source. This result is in agreement with the picture of the coaligned radio jet and X-ray jet model of the broadband properties of BL Lac objects. For the BL Lac objects listed in Ciliegi et al. that are not detected by EGRET, co-adding of the EGRET data for the undetected RBLs in such a way that the source positions coincide with each other yields a flux excess at a 3.5 σ level, but similar co-adding of the EGRET data for the undetected XBLs yields no flux excess.",

author = "Lin, \{Y. C.\} and Bertsch, \{D. L.\} and Dingus, \{B. L.\} and Esposito, \{J. A.\} and Fichtel, \{C. E.\} and Hartman, \{R. C.\} and Hunter, \{S. D.\} and G. Kanbach and Kniffen, \{D. A.\} and Mattox, \{J. R.\} and Mayer-Hasselwander, \{H. A.\} and Michelson, \{P. F.\} and \{Von Montigny\}, C. and R. Mukherjee and Nolan, \{P. L.\} and Schneid, \{E. J.\} and P. Sreekumar and Thompson, \{D. J.\} and Willis, \{T. D.\}",

year = "1997",

doi = "10.1086/310494",

language = "English",

volume = "476",

pages = "L11--L14",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1 PART II",

}

Lin, YC, Bertsch, DL, Dingus, BL, Esposito, JA, Fichtel, CE, Hartman, RC, Hunter, SD, Kanbach, G, Kniffen, DA, Mattox, JR, Mayer-Hasselwander, HA, Michelson, PF, Von Montigny, C, Mukherjee, R, Nolan, PL, Schneid, EJ, Sreekumar, P, Thompson, DJ & Willis, TD 1997, 'Comparison of X-ray- and radio-selected bl lacertae objects in high-energy gamma-ray observations', Astrophysical Journal, vol. 476, no. 1 PART II, pp. L11-L14. https://doi.org/10.1086/310494

TY - JOUR

T1 - Comparison of X-ray- and radio-selected bl lacertae objects in high-energy gamma-ray observations

AU - Lin, Y. C.

AU - Bertsch, D. L.

AU - Dingus, B. L.

AU - Esposito, J. A.

AU - Fichtel, C. E.

AU - Hartman, R. C.

AU - Hunter, S. D.

AU - Kanbach, G.

AU - Kniffen, D. A.

AU - Mattox, J. R.

AU - Mayer-Hasselwander, H. A.

AU - Michelson, P. F.

AU - Von Montigny, C.

AU - Mukherjee, R.

AU - Nolan, P. L.

AU - Schneid, E. J.

AU - Sreekumar, P.

AU - Thompson, D. J.

AU - Willis, T. D.

PY - 1997

Y1 - 1997

N2 - In the course of the Compton Gamma Ray Observatory mission, the EGRET telescope has detected 14 BL Lacertae objects in high-energy gamma rays through Phase 4. According to the BL Lac sample in Ciliegi, Bassani, & Caroli, two of these 14 sources are X-ray selected (XBL) and 10 are radio-selected (RBL); two are not listed in this sample. An examination of the radio fluxes and the X-ray fluxes for the BL Lac objects detected by EGRET reveals that it seems a strong radio flux must be present if high-energy gamma rays are to be detected in a BL Lac object, while detection is independent of the X-ray flux of the source. This result is in agreement with the picture of the coaligned radio jet and X-ray jet model of the broadband properties of BL Lac objects. For the BL Lac objects listed in Ciliegi et al. that are not detected by EGRET, co-adding of the EGRET data for the undetected RBLs in such a way that the source positions coincide with each other yields a flux excess at a 3.5 σ level, but similar co-adding of the EGRET data for the undetected XBLs yields no flux excess.

AB - In the course of the Compton Gamma Ray Observatory mission, the EGRET telescope has detected 14 BL Lacertae objects in high-energy gamma rays through Phase 4. According to the BL Lac sample in Ciliegi, Bassani, & Caroli, two of these 14 sources are X-ray selected (XBL) and 10 are radio-selected (RBL); two are not listed in this sample. An examination of the radio fluxes and the X-ray fluxes for the BL Lac objects detected by EGRET reveals that it seems a strong radio flux must be present if high-energy gamma rays are to be detected in a BL Lac object, while detection is independent of the X-ray flux of the source. This result is in agreement with the picture of the coaligned radio jet and X-ray jet model of the broadband properties of BL Lac objects. For the BL Lac objects listed in Ciliegi et al. that are not detected by EGRET, co-adding of the EGRET data for the undetected RBLs in such a way that the source positions coincide with each other yields a flux excess at a 3.5 σ level, but similar co-adding of the EGRET data for the undetected XBLs yields no flux excess.

UR - https://www.scopus.com/pages/publications/21444444634

UR - https://www.scopus.com/inward/citedby.url?scp=21444444634&partnerID=8YFLogxK

U2 - 10.1086/310494

DO - 10.1086/310494

M3 - Article

AN - SCOPUS:21444444634

SN - 0004-637X

VL - 476

SP - L11-L14

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 PART II

ER -

Comparison of X-ray- and radio-selected bl lacertae objects in high-energy gamma-ray observations

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this