SPECTROSCOPY OF THE LARGEST EVER γ-RAY-SELECTED BL LAC SAMPLE

@article{Shaw2013SPECTROSCOPYOT,
title={SPECTROSCOPY OF THE LARGEST EVER $\gamma$-RAY-SELECTED BL LAC SAMPLE},
author={Michael S. Shaw and Roger W. Romani and Garret Cotter and Stephen E. Healey and P. F. Michelson and Anthony C. S. Readhead and Joseph L. Richards and Walter Max-Moerbeck and Oliver G. King and William J Potter},
journal={The Astrophysical Journal},
year={2013},
volume={764}
}
• Published 2 January 2013
• Physics
• The Astrophysical Journal
We report on spectroscopic observations covering most of the 475 BL Lacs in the second Fermi Large Area Telescope (LAT) catalog of active galactic nuclei (AGNs). Including archival measurements (correcting several erroneous literature values) we now have spectroscopic redshifts for 44% of the BL Lacs. We establish firm lower redshift limits via intervening absorption systems and statistical lower limits via searches for host galaxies for an additional 51% of the sample leaving only 5% of the BL…
159 Citations

Figures and Tables from this paper

Spectroscopy of optically selected BL Lac objects and their γ-ray emission

• Physics
• 2013
We present Very Large Telescope optical spectroscopy of nine BL Lac objects of unknown redshift belonging to the list of optically selected radio-loud BL Lac candidates. We explore their

Southern African Large Telescope Spectroscopy of BL Lacs for the CTA project

• Physics
Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)
• 2021
In the last two decades, very-high-energy gamma-ray astronomy has reached maturity: over 200 sources have been detected, both Galactic and extragalactic, by ground-based experiments. At present,

Optical spectroscopy of BL Lac objects: TeV candidates

• Physics
• 2020
We investigate the spectroscopic optical properties of gamma-ray sources detected with high significance above 50 GeV in the Third Catalog of Hard Fermi-LAT Sources (3FHL) and that are good

Spectroscopy of BL Lacertae objects of extraordinary luminosity

• Physics
• 2014
Aims. We aim to determine the redshift (or stringent lower limits) of a number of bright BL Lacs objects. Methods. We secured medium resolution optical and near-infrared spectra of 4 bright BL Lac

On the Redshift of TeV BL Lac Objects

• Physics
• 2017
We report results of a spectroscopic campaign carried out at the 10 m Gran Telescopio Canarias for a sample of 22 BL Lac objects detected (or candidates) at TeV energies, aiming to determine or

NEW HIGH-z FERMI BL LACS WITH THE PHOTOMETRIC DROPOUT TECHNIQUE

• Physics
• 2016
Determining redshifts for BL Lacertae (BL Lac) objects using the traditional spectroscopic method is challenging due to the absence of strong emission lines in their optical spectra. We employ the

THE COSMIC EVOLUTION OF FERMI BL LACERTAE OBJECTS

• Physics
• 2013
Fermi has provided the largest sample of γ-ray-selected blazars to date. In this work we use a uniformly selected set of 211 BL Lacertae (BL Lac) objects detected by Fermi during its first year of

OPTICAL SPECTROSCOPIC OBSERVATIONS OF γ-RAY BLAZAR CANDIDATES. III. THE 2013/2014 CAMPAIGN IN THE SOUTHERN HEMISPHERE

• Physics
• 2015
We report the results of our exploratory program carried out with the southern Astrophysical Research telescope aimed at associating counterparts and establishing the nature of the Fermi Unidentified

Redshift measurement of Fermi Blazars for the Cherenkov Telescope Array

• Physics
• 2015
Blazars are active galactic nuclei, and the most numerous High Energy (HE) and Very High Energy (VHE) gamma-ray emitters. Their optical emission is often dominated by non-thermal, and, in the case of

Optical Spectroscopic Survey of a Sample of Unidentified Fermi Objects

• Physics
The Astrophysical Journal
• 2019
We present optical spectroscopy secured at the 10 m Gran Telescopio Canarias of the counterparts of 20 extragalactic γ-ray sources detected by the Fermi satellite. The observations allow us to

References

SHOWING 1-10 OF 42 REFERENCES

IMAGING REDSHIFT ESTIMATES FOR BL LACERTAE OBJECTS

• Physics
• 2010
We have obtained high dynamic range, good natural seeing i′ images of BL Lacertae objects (BL Lacs) to search for the active galactic nucleus host and thus constrain the source redshift. These

OPTICALLY SELECTED BL LACERTAE CANDIDATES FROM THE SLOAN DIGITAL SKY SURVEY DATA RELEASE SEVEN

• Physics
• 2010
We present a sample of 723 optically selected BL Lac candidates from the Sloan Digital Sky Survey Data Release 7 (SDSS DR7) spectroscopic database encompassing 8250 deg2 of sky; our sample

The Chandra Deep Field-South: Optical Spectroscopy. I.

• Physics
• 2004
We present the results of our spectroscopic follow-up program of the X-ray sources detected in the 942 ks exposure of the Chandra Deep Field-South (CDFS). A total of 288 possible counterparts were

The Hubble Space Telescope Survey of BL Lacertae Objects. II. Host Galaxies

• Physics
• 1999
We have used the Hubble Space Telescope (HST) WFPC2 camera to survey 132 BL Lac objects comprising seven complete radio-, X-ray-, and optically selected samples. We obtained useful images for 110

Optical spectroscopy and polarization of a new sample of optically bright flat radio spectrum sources

• Physics
• 1996
A new sample of bright fiat radio spectrum sources selected at 8.4 GHz and consisting of objects brighter than V = 17 is discussed. The sample was selected with three purposes in mind: (i) to find

Imaging Redshifts of BL Lacertae Objects

• Physics
• 2005
The HST snapshot imaging survey of 110 BL Lac objects (Urry et al.) has clearly shown that the host galaxies are massive and luminous ellipticals. The dispersion of the absolute magnitudes is

Host Galaxy Evolution in Radio-Loud Active Galactic Nuclei

• Physics
• 2005
We investigate the luminosity evolution of the host galaxies of radio-loud active galactic nuclei (AGNs) through Hubble Space Telescope imaging of 72 BL Lac objects, including new Space Telescope

ESO Very Large Telescope Optical Spectroscopy of BL Lacertae Objects. I. New Redshifts

• Physics
• 2005
We report redshift measurements for 12 BL Lacertae objects from a program aimed at obtaining high signal-to-noise ratio (up to ∼500) optical spectroscopy of a mixed sample of objects. The new

THE LUMINOSITY FUNCTION OF FERMI-DETECTED FLAT-SPECTRUM RADIO QUASARS

• Physics
• 2012
Fermi has provided the largest sample of γ-ray-selected blazars to date. In this work we use a complete sample of flat spectrum radio quasars (FSRQs) detected during the first year of operation to

The HRX-BL Lac sample - Evolution of BL Lac objects ?

• Physics
• 2003
The unification of X-ray and radio selected BL Lacs has been an outstanding problem in the blazar research in the past years. Recent investigations have shown that the gap between the two classes can