BL Lacertae object: Difference between revisions
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[[Image:H0323bl2.gif|thumb|right|The BL Lac object H 0323+022 (z=0.147) imaged at ESO NTT (R filter). |
[[Image:H0323bl2.gif|thumb|right|The BL Lac object H 0323+022 (z=0.147) imaged at ESO NTT (R filter). |
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The host galaxy and close companions are visible.]] |
The host galaxy and close companions are visible.]] |
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A '''BL Lacertae object''' or '''BL Lac object''' is a type of galaxy with an [[active galactic nucleus]] (AGN), named after its prototype, [[BL Lacertae]]. In contrast to other types of active galactic nuclei, BL Lacs are characterized by rapid and large-amplitude flux variability and significant optical polarization. Because of these properties, the prototype of the class ([[BL Lacertae|BL Lac]]) was originally thought to be a variable star. When compared to the more luminous active nuclei ([[Quasar|quasars]]) with strong emission lines, BL Lac objects have spectra dominated by a relatively featureless non-thermal emission continuum over the entire electromagnetic range.<ref name=":0">{{Cite journal|last=Falomo|first=Renato|year=2014|title=An Optical View of BL Lacertae Objects|url=https://arxiv.org/pdf/1407.7615.pdf|journal=The Astronomy and Astrophysics Review|volume=|pages=44|via=}}</ref> This lack of spectral lines historically hindered BL Lac's identification of their nature and proved to be a hurdle in the determination of their distance.<ref name=":0" /> |
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When compared to the more luminous active nuclei ([[quasar]]s) with strong emission lines, BL Lac objects have spectra dominated by a featureless non-thermal continuum.<ref name="stein1976">{{cite journal |url=http://james.as.arizona.edu/~psmith/Blazars/stein.pdf |title=The BL Lacertae Objects |journal=Annual Review of Astronomy and Astrophysics |publisher=Annual Reviews |first1=W A |last1=Stein |first2=S L |last2=O'Dell |first3=P A |last3=Strittmatter |volume=14 |date=September 1976 |pages=173–195 |bibcode=1976ARA&A..14..173S |doi=10.1146/annurev.aa.14.090176.001133}}</ref><ref>{{Cite journal |title = The Cosmic Evolution of Fermi BL Lacertae Objects |url = http://iopscience.iop.org/0004-637X/780/1/73 |journal = The Astrophysical Journal |date = 2014-01-01 |page=73 |volume = 780 |issue = 1 |doi = 10.1088/0004-637X/780/1/73 |language = en |first = M. |last = Ajello |first2 = R. W. |last2 = Romani |first3 = D. |last3 = Gasparrini |first4 = M. S. |last4 = Shaw |first5 = J. |last5 = Bolmer |first6 = G. |last6 = Cotter |first7 = J. |last7 = Finke |first8 = J. |last8 = Greiner |first9 = S. E. |last9 = Healey |arxiv = 1310.0006 |bibcode = 2014ApJ...780...73A}}</ref> |
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In the unified scheme of radio-loud active galactic nuclei, the observed nuclear phenomenology of BL Lacs is interpreted as being due to the effects of the |
In the unified scheme of radio-loud active galactic nuclei, the observed nuclear phenomenology of BL Lacs is interpreted as being due to the effects of the [[relativistic jet]] closely aligned to the line of sight of the observer. BL Lacs are thought to be intrinsically identical to low-power [[Radio galaxy|radio galaxies]]. These active nuclei appear to be hosted in massive elliptical galaxies. From the point of AGN classification, BL Lacs are a [[blazar]] subtype. All known BL Lacs are associated with core dominated radio sources, many of them exhibiting [[superluminal motion]]. |
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The blazar category encompasses all quasars oriented with the relativistic jet directed at the observer giving a unique radio emission spectrum. This includes both radio quiet AGN (BL Lacs) along with optically violent variable (OVV) quasars, however in general practice, "Blazar" and "BL Lac Object" are often used interchangeably. OVV quasars are generally more luminous and have stronger emission lines than BL Lac objects.<ref>{{Cite journal|last=Urry|first=Megan|year=1995|title=Unified Schemes for Radio-Loud Active Galactic Nuclei|url=http://adsabs.harvard.edu/abs/1995PASP..107..803U|journal=Publications of the Astronomical Society of the Pacific|volume=|pages=|via=SAO/NASA ADS}}</ref> |
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==Host galaxies== |
==Host galaxies== |
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Soon after the discovery of this unusual class of objects it was noted that the sources were surrounded by a faint nebulosity. In the late |
Soon after the discovery of this unusual class of objects it was noted that the sources were surrounded by a faint nebulosity. In the late 1970s the use of modern detectors (such as [[Charge-coupled device|CCD]]) allowed observers to probe with better accuracy the nature of the nebulosity. First images of the BL Lac PKS 0548-322 by M. Disney in 1974 in various filters found it to be composed by a giant elliptical galaxy with a bright nucleus. |
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Extensive surveys taken with the Hubble Space Telescope of 132 BL Lac objects comprising seven complete radio, X-ray, and optically selected samples in 2000 studied the morphologies of possible BL Lac host galaxies. The data concluded that in 2/3 of the BLL images taken, host galaxies are detected, including in nearly all with redshift z < 0.5. BL Lac objects are luminous enough that only one quarter (6/22) of the images taken with z > 0.5 were resolved because of relatively short exposure times. A de Vaucouleurs profile <math>I(R)\propto R^\frac14</math> looks to be a significantly preferred brightness profile for 58 of the 72 resolved host galaxies at over ~99% confidence. The results of this survey conclude that there is a 8% limit to the number of disk systems in BL Lac objects and is therefore consistent with the assumption that all BL Lac host galaxies could be elliptical. These ellipticals are very luminous with a median absolute K-corrected magnitude of <math>M_R\thicksim-23.7\pm-0.6</math> mag (rms dispersion). This is comparable to the brightest cluster galaxies. |
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About 10 years later, at the second conference entirely dedicated to BL Lac objects in [[Como]] a report by M-H. Ulrich listed about 15 objects for which their host galaxy was measured and then compared with the properties of bright radio galaxies in order to test the consistency of the hypothesis that BL Lacs are indeed the parent population of FR -I radio galaxies with the jet pointing closely to the observer direction. With the caveat of the exiguity of the sample and the non homogeneous used dataset it was argued that BL Lac host population is very similar to that of B2 radiogalaxies. |
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==History== |
==History== |
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John L. Schmitt first noticed the peculiar nature of BL Lac in 1968 when he matched it with a radio object, VRO 42.22.01.<ref name="schmitt1968">{{cite journal |url=http://www.nature.com/nature/journal/v218/n5142/abs/218663a0.html |title=''BL Lac'' identified as a Radio Source |journal=Nature |first1=John L. |last1=Schmitt |volume=218 |date=May 1968 |page=663 |bibcode=1968Natur.218..663S |doi = 10.1038/218663a0 |issue=5142}}</ref> |
John L. Schmitt first noticed the peculiar nature of BL Lac in 1968 when he matched it with a radio object, VRO 42.22.01.<ref name="schmitt1968">{{cite journal |url=http://www.nature.com/nature/journal/v218/n5142/abs/218663a0.html |title=''BL Lac'' identified as a Radio Source |journal=Nature |first1=John L. |last1=Schmitt |volume=218 |date=May 1968 |page=663 |bibcode=1968Natur.218..663S |doi = 10.1038/218663a0 |issue=5142}}</ref> |
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Within a year others observed that the radio flux varied, and that light was polarized. Strittmatter proposed the class of object in 1972 and added four objects. By 1976 there were 30 known objects.<ref name="stein1976"/> |
Within a year others observed that the radio flux varied, and that light was polarized. Strittmatter proposed the class of object in 1972 and added four objects. By 1976 there were 30 known objects.<ref name="stein1976">{{cite journal|last2=O'Dell|first2=S L|last3=Strittmatter|first3=P A|date=September 1976|title=The BL Lacertae Objects|url=http://james.as.arizona.edu/~psmith/Blazars/stein.pdf|journal=Annual Review of Astronomy and Astrophysics|publisher=Annual Reviews|volume=14|pages=173–195|bibcode=1976ARA&A..14..173S|doi=10.1146/annurev.aa.14.090176.001133|first1=W A|last1=Stein}}</ref> |
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==See also== |
==See also== |
Revision as of 05:10, 20 March 2017
This article needs additional citations for verification. (February 2010) |
A BL Lacertae object or BL Lac object is a type of galaxy with an active galactic nucleus (AGN), named after its prototype, BL Lacertae. In contrast to other types of active galactic nuclei, BL Lacs are characterized by rapid and large-amplitude flux variability and significant optical polarization. Because of these properties, the prototype of the class (BL Lac) was originally thought to be a variable star. When compared to the more luminous active nuclei (quasars) with strong emission lines, BL Lac objects have spectra dominated by a relatively featureless non-thermal emission continuum over the entire electromagnetic range.[1] This lack of spectral lines historically hindered BL Lac's identification of their nature and proved to be a hurdle in the determination of their distance.[1]
In the unified scheme of radio-loud active galactic nuclei, the observed nuclear phenomenology of BL Lacs is interpreted as being due to the effects of the relativistic jet closely aligned to the line of sight of the observer. BL Lacs are thought to be intrinsically identical to low-power radio galaxies. These active nuclei appear to be hosted in massive elliptical galaxies. From the point of AGN classification, BL Lacs are a blazar subtype. All known BL Lacs are associated with core dominated radio sources, many of them exhibiting superluminal motion.
The blazar category encompasses all quasars oriented with the relativistic jet directed at the observer giving a unique radio emission spectrum. This includes both radio quiet AGN (BL Lacs) along with optically violent variable (OVV) quasars, however in general practice, "Blazar" and "BL Lac Object" are often used interchangeably. OVV quasars are generally more luminous and have stronger emission lines than BL Lac objects.[2]
Some examples of BL Lac objects are BL Lacertae itself, OJ 287, AP Librae, PKS 2155-304, PKS 0521-365, Markarian 421, 3C 371, W Com, ON 325 and Markarian 501.
Host galaxies
Soon after the discovery of this unusual class of objects it was noted that the sources were surrounded by a faint nebulosity. In the late 1970s the use of modern detectors (such as CCD) allowed observers to probe with better accuracy the nature of the nebulosity. First images of the BL Lac PKS 0548-322 by M. Disney in 1974 in various filters found it to be composed by a giant elliptical galaxy with a bright nucleus.
Extensive surveys taken with the Hubble Space Telescope of 132 BL Lac objects comprising seven complete radio, X-ray, and optically selected samples in 2000 studied the morphologies of possible BL Lac host galaxies. The data concluded that in 2/3 of the BLL images taken, host galaxies are detected, including in nearly all with redshift z < 0.5. BL Lac objects are luminous enough that only one quarter (6/22) of the images taken with z > 0.5 were resolved because of relatively short exposure times. A de Vaucouleurs profile looks to be a significantly preferred brightness profile for 58 of the 72 resolved host galaxies at over ~99% confidence. The results of this survey conclude that there is a 8% limit to the number of disk systems in BL Lac objects and is therefore consistent with the assumption that all BL Lac host galaxies could be elliptical. These ellipticals are very luminous with a median absolute K-corrected magnitude of mag (rms dispersion). This is comparable to the brightest cluster galaxies.
History
John L. Schmitt first noticed the peculiar nature of BL Lac in 1968 when he matched it with a radio object, VRO 42.22.01.[3]
Within a year others observed that the radio flux varied, and that light was polarized. Strittmatter proposed the class of object in 1972 and added four objects. By 1976 there were 30 known objects.[4]
See also
References
- ^ a b Falomo, Renato (2014). "An Optical View of BL Lacertae Objects" (PDF). The Astronomy and Astrophysics Review: 44.
- ^ Urry, Megan (1995). "Unified Schemes for Radio-Loud Active Galactic Nuclei". Publications of the Astronomical Society of the Pacific – via SAO/NASA ADS.
- ^ Schmitt, John L. (May 1968). "BL Lac identified as a Radio Source". Nature. 218 (5142): 663. Bibcode:1968Natur.218..663S. doi:10.1038/218663a0.
- ^ Stein, W A; O'Dell, S L; Strittmatter, P A (September 1976). "The BL Lacertae Objects" (PDF). Annual Review of Astronomy and Astrophysics. 14. Annual Reviews: 173–195. Bibcode:1976ARA&A..14..173S. doi:10.1146/annurev.aa.14.090176.001133.
Sources
- Marscher, A P; et al. (24 April 2008). "The inner jet of an active galactic nucleus as revealed by a radio-to-gamma-ray outburst". Nature. 452 (7190): 966–969. Bibcode:2008Natur.452..966M. doi:10.1038/nature06895. PMID 18432239.
- Padovani, Paolo; Giommi, Paolo (15 December 1995). "A Sample-Oriented Catalogue of BL Lacertae Objects". Monthly Notices of the Royal Astronomical Society. 277 (4): 1477–1490. arXiv:astro-ph/9511065v1. Bibcode:1995MNRAS.277.1477P. doi:10.1093/mnras/277.4.1477.
{{cite journal}}
: CS1 maint: unflagged free DOI (link)
External links
- ZBLLAC - A spectroscopic library of BL Lac objects