The complete sample of 1 Jansky BL Lacertae objects. I - Summary properties

Stickel, M.; Fried, J. W.; Kuehr, H.; Padovani, P.; Urry, C. Megan

doi:10.1086/170133

Cited by 601 publications

(689 citation statements)

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“…Galaxy G1 in Fig. 5 can be directly ruled out due to the redshift z = 0.645 measured by Stickel et al (1993). and Falomo & Ulrich (2000) detected weak R-band emission 3.…”

Section: Discussion Of Pks 0735+178mentioning

confidence: 90%

“…Later spectroscopy (e.g. Stickel et al 1993;Falomo et al 1994;Rector & Stocke 2001) has confirmed the absorption system, but no emission features or host galaxy absorption lines have been detected and the redshift remains unknown. Optical imaging (Hutchings et al 1988;Abraham et al 1991;Stickel et al 1993;Falomo & Ulrich 2000;Scarpa et al 2000;Pursimo et al 2002) has also failed to detect the host galaxy.…”

Section: Introductionmentioning

confidence: 99%

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Redshift constraints for RGB 0136+391 and PKS 0735+178 from deep optical imaging

Nilsson

Pursimo

Villforth

et al. 2012

A&A

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We present the results of deep I-band imaging of two BL Lacerate objects, RGB 0136+391 and PKS 0735+178, during an epoch when the optical nucleus was in a faint state in both targets. In PKS 0735+178 we find a significant excess over a point source, which, if fitted by the de Vaucouleurs model, corresponds to a galaxy with I = 18.64 ± 0.11 and r eff = 1.8 ± 0.4 arcsec. Interpreting this galaxy as the host galaxy of PKS 0735+178 we derive z = 0.45 ± 0.06 using the host galaxy as a "standard candle". We also discuss the immediate optical environment of PKS 0735+178 and the identity of the MgII absorber at z = 0.424. Despite of the optimally chosen epoch and deep imaging we find the surface brightness profile of RGB 0136+391 to be consistent with a point source. By determining a lower limit for the host galaxy brightness by simulations, we derive z > 0.40 for this target.

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“…Galaxy G1 in Fig. 5 can be directly ruled out due to the redshift z = 0.645 measured by Stickel et al (1993). and Falomo & Ulrich (2000) detected weak R-band emission 3.…”

Section: Discussion Of Pks 0735+178mentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Redshift constraints for RGB 0136+391 and PKS 0735+178 from deep optical imaging

Nilsson

Pursimo

Villforth

et al. 2012

A&A

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“…One of the most interesting characteristics of the REX survey is that it has been designed to sample the BL Lac population more homogeneously than previous radio or X-ray surveys. The EMSS survey (Morris et al 1991), for instance, has selected objects with a flat X-ray-to-radio spectral index (ctRx <0.7, defined as High Energy Peaked BL Lacs, HBL) while the radio selected 1 Jy sample (Stickel et al 1991) has found sources with a^x >0.7 (Low Energy peaked BL Lacs, LBLs). In Figure 1 the OLRX distribution of the BL Lacs discovered so far in the REX survey is compared to that of the BL Lacs in the EMSS and the 1 Jy samples.…”

Section: The Rex Survey: Sampling the Bl Lac Populationmentioning

confidence: 99%

New Results from the REX Survey

Caccianiga¹,

Marchã²,

Maccacaro³

et al. 2002

International Astronomical Union Colloquium

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Abstract. The REX survey is an ongoing project aimed at the selection of new samples of QSOs and BL Lac objects. Spectroscopic identification of the ~1600 sources in the survey is in progress reaching, so far, about 40% of complete identification level. In this paper, the most recent results derived from the REX survey are briefly summarized. The REX Survey: Sampling the BL Lac PopulationThe main scientific goal of the REX survey is the selection of new samples of AGNs, like radio-loud QSOs and BL Lac objects. One of the most interesting characteristics of the REX survey is that it has been designed to sample the BL Lac population more homogeneously than previous radio or X-ray surveys. The EMSS survey (Morris et al. 1991), for instance, has selected objects with a flat X-ray-to-radio spectral index (ctRx <0.7, defined as High Energy Peaked BL Lacs, HBL) while the radio selected 1 Jy sample (Stickel et al. 1991) has found sources with a^x >0.7 (Low Energy peaked BL Lacs, LBLs). In Figure 1 the OLRX distribution of the BL Lacs discovered so far in the REX survey is compared to that of the BL Lacs in the EMSS and the 1 Jy samples. The REX survey is clearly finding many objects with intermediate properties between HBLs and LBLs, thus suggesting that the presence of a dichotomy in the BL Lac class, often claimed in the literature, could be artificially created by selection effects. The XB-REX Sample: Studying the Cosmological EvolutionA first completely identified sub-sample of 237 REXs has already been selected by imposing an X-ray flux limit greater than 4x 10 -1 3 erg s _ 1 c m -2 and a magnitude (B) brighter than 20.5. The resulting sample (the X-ray Bright REX sample, XB-REX) has been used to estimate the cosmological evolution of emission 257 terms of use, available at https://www.cambridge.org/core/terms. https://doi

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“…The blazar class includes both BL Lac objects (BL Lacs) and Flat Spectrum Radio Quasars (FSRQs), similar in the shape of their spectral energy distribution (SED) but different in their optical spectrum. BL Lacs display no or very weak emission lines with equivalent width W λ 5Å (Stickel et al 1991;Stocke et al 1991); conversely, FSRQs reveal evidence of broad emission lines. According to the Unification Scenario, BL Lacs and FSRQs are thought to be the beamed counterparts of low-(FRI) and high-luminosity (FRII) radio galaxies (Fanaroff and Riley 1974), respectively.…”

Section: Introductionmentioning

confidence: 99%

New blazars from the cross-match of recent multi-frequency catalogs

Maselli

Massaro

D’Abrusco

et al. 2015

Astrophys Space Sci

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Blazars are radio-loud active galactic nuclei well known for their non thermal emission spanning a wide range of frequencies. The Roma-BZCAT is, to date, the most comprehensive list of these sources. We performed the cross-match of several catalogs obtained from recent surveys at different frequencies to search for new blazars. We cross-matched the 1 st Swift XRT Point Source catalog with the spectroscopic sample of the 9 th Data Release of the Sloan Digital Sky Survey. Then, we performed further cross-matches with the catalogs corresponding to the Faint Images of the Radio Sky at Twenty cm survey and to the AllWISE Data re- lease, focusing on sources with infrared colors similar to those of confirmed γ-ray blazars included in the Second Fermi-LAT catalog. As a result, we obtained a preliminary list of objects with all the elements needed for a proper blazar classification according to the prescriptions of the Roma-BZCAT. We carefully investigated additional properties such as their morphology and the slope of their spectral energy distribution in the radio domain, the features shown in their optical spectrum, and the luminosity in the soft X rays to exclude generic active galactic nuclei and focus on authentic blazar-like sources. At the end of our screening we obtained a list of 15 objects with firmly established blazar properties.

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The complete sample of 1 Jansky BL Lacertae objects. I - Summary properties

Cited by 601 publications

References 0 publications

Redshift constraints for RGB 0136+391 and PKS 0735+178 from deep optical imaging

Redshift constraints for RGB 0136+391 and PKS 0735+178 from deep optical imaging

New Results from the REX Survey

New blazars from the cross-match of recent multi-frequency catalogs

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