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Tuesday, April 21, 2020 | History

3 edition of Coordinated observations of X-ray bright BL lacertae objects found in the catalog.

Coordinated observations of X-ray bright BL lacertae objects

Claudia Megan Urry

Coordinated observations of X-ray bright BL lacertae objects

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Published by Massacusetts Institute of Technology, National Aeronautics and Space Administration, National Technical Information Service, distributor in Cambridge, MA, [Washington, DC, Springfield, Va .
Written in English


Edition Notes

StatementC. Megan Urry, principal investigator
SeriesNASA contractor report -- NASA CR-177297
ContributionsUnited States. National Aeronautics and Space Administration
The Physical Object
FormatMicroform
Pagination1 v
ID Numbers
Open LibraryOL14982702M

  c. their sizes are different: Quasars are star-sized, double radio are sources larger, and BL Lacertae objects are galaxy-sized. d. their position in the universe is different: Quasars are in our Galaxy, double radio sources are associated with other galaxies, and BL Lacertae objects are within the vast voids of space between galaxies. We present coordinated multiwavelength observations of the bright, nearby BL Lacertae object Mrk taken in January-March, involving GASP-WEBT, Swift, NuSTAR, Fermi-LAT, MAGIC, VERITAS, and other collaborations and instruments, providing data from radio to very high energy (VHE) γ Cited by: 1. Introduction. Along with flat-spectrum radio-quasars (FSRQs), BL Lacertae objects (BLLs) form one of the most extreme classes of active galactic nuclei (AGNs), which is characterized by the compact and flat-spectrum radio emission, superluminal motion of some radio-components, non-thermal continuum emission across the entire electromagnetic spectrum, and strong flux variability in all. We report on observations of the blazar Mrk with the VERITAS experiment during the month of February taken in conjunction with a Fermi-LAT-organized multi-wavelength campaign. On Febru an unusually bright flare was measured in TeV γ-rays reaching a level of ∼8 Crab with variability timescales as fast as a few by: 3.


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Coordinated observations of X-ray bright BL lacertae objects by Claudia Megan Urry Download PDF EPUB FB2

We propose to use the IUE satellite to observe eight BL Lacertae objects as part of a continuing, comprehensive program of quasi-simultaneous spectral coverage in the radio, infrared, visual, ultraviolet, and X-ray wavebands.

All of our targets are known X-ray sources, and all have now been observed Author: C. Urry. Simultaneous multifrequency observations of the BL Lac object Mkn covering radio through X-ray wavelengths were performed.

Composite multifrequency spectra of the central nonthermal component were obtained at the two epochs after subtracting the optical and infrared light of the underlying galaxy.

Abstract We propose to use the IUE satellite to observe six BL Lacertae objects as part of a comprehensive program of complete, quasi-simultaneous spectral coverage in the radio, visual, ultraviolet, and X-ray wavebands. All of our targets are known X-ray sources, and five of the six have been observed previously with IUE.

Title: Coordinated observations of X-ray bright BL Lacertae objects: Authors: Urry, C. Affiliation: AA(Massachusetts Institute of Technology, Cambridge.).

Get this from a library. Coordinated observations of X-ray bright BL lacertae objects. [Claudia Megan Urry; United States. National Aeronautics and Space Administration.]. Get this from a library. Coordinated observations of X-ray bright BL Lacertae objects: semi-annual status report #2, NASA grant NAG [Claudia Megan Urry; United States.

National Aeronautics and Space Administration.]. Coordinated observations of X-ray bright BL lacertae objects.

By C. Urry. Abstract. Simultaneous multifrequency observations of the BL Lac object Mkn covering radio through Coordinated observations of X-ray bright BL lacertae objects book wavelengths were performed.

Composite multifrequency spectra of the central nonthermal component were obtained at the two epochs after subtracting the optical Author: C. Urry. Coordinated observations of X-ray bright BL Lacertae objects (IUE) observations were scheduled.

The work on the spectral extraction routine was continued. The computer code was adapted from the RDAF PDP 11/44 computer to a VAX 11/, in order that it run more quickly.

A chapter on ultraviolet observations of blazars for a book celebrating Author: C. Urry. The continuous spectra of the nearby BL Lac objects Mrk and Mrk have been investigated by making coordinated observations at X-ray, ultraviolet, optical, and radio wavelengths.

The. Abstract. This contribution is divided into three parts: 1.A summary of mostly published work that describes the new type of BL Lac Objects discovered with X-ray satellites, “X-ray Bright BL Lacs (XBLs)”, and their relationship to the previously known “radio bright BL Lacs (RBLs).”Author: John T.

Stocke. The Institute of Physics (IOP) is a leading scientific society promoting physics and bringing physicists together for the benefit of all. It has a worldwide membership of around 5. A BL Lacertae object or BL Lac object is a type of active galactic nucleus (AGN) or a galaxy with such an AGN, named after its prototype, BL 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 was originally thought to. sachusetts Institute of Technology in response to a proposal, entitled Coordinated Observations of X- Ray Bright BL Lacertae Objects, to use the International Ultraviolet Explorer (IUE) satellite. We present new BeppoSAX LECS and MECS observations, covering the energy range –10 keV (observer's frame), of four BL Lacertae objects selected from the 1-Jy sample.

Preliminary results on BeppoSAX LECS and MECS observations of BL Lacertae objects selected from the 1 Jy sample are presented. All sources of the LBL type, that is, characterized by a peak in their multifrequency spectra at infrared/optical energies, seem to show a relatively flat (α x ∼ – ) X-ray is in agreement with the supposed dominance of inverse Compton emission Cited by: 2.

The optical-UV and X-ray instruments on-board XMM-Ndewton provide an excellent opportunity to perform simultaneous observations of violently variable objects over a broad wavelength range.

The UV and X-ray bright BL Lac object PKS has been repeatedly observed with XMM-Ndewton about twice per year. In this paper, we present a detailed analysis of the simultaneous multiwavelength Cited by: Abstract.

We have analyzed the X-ray spectra of all BL Lacs observed (as pointed or serendipitous sources) by al indices were obtained from the hardness ratios given in the WGA catalogue [5], a large list of X-ray sources generated from all the ROSAT PSPC pointed observations.

The selection of the objects was done by cross-correlating the first revision of the WGA catalogue with Cited by: 1 EPIC OBSERVATIONS OF BRIGHT BL LAC OBJECTS: WHAT CAN WE LEARN FROM THE X-RAY SPECTRA ABOUT THE ISM F.

Haberl1, S. Sembay2, B. Altieri3, and W. Brinkmann1 1Max-Planck-Institut fu¤r extraterrestrische Physik, Giessenbachstraße, Garching, Germany 2Department of Physics and Astronomy, Leicester University, Leicester, UK 3European Space Agency, ESAC.

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The optical-UV and X-ray instruments on-board XMM-Newton provide an excellent opportunity to perform simultaneous observations of violently variable objects over a broad wavelength range.

The UV and X-ray bright BL Lac object PKS – has been repeatedly observed with XMM-Newton about twice per year. Semi-Annual Status Report #1 NASA Grant NAG Coordinated Observations of X-Ray Bright BL Lacertae Objects C.

Megan Urry, Principal Investigator 15 March - 15 September This is a semi-annual status report to the National Aeronautics and Space Administration (NASA) concerning NASA grant NAG spectral components in the BL Lac object S5 + detected during coordinated BeppoSAX and optical ob-servations in and The transition between syn-chrotron and inverse Compton emission has been clearly detected as sharp X-ray spectral breaks at around keV on both occasions.

Correlated optical and soft X. High-quality Far Ultraviolet Spectroscopic Explorer (FUSE) observations at 20 km s-1 resolution of interstellar and intergalactic absorption from to Å are presented for the X-ray-bright BL Lac object Mrk These observations are supplemented with FUSE data for the distant halo stars BD +38° and HD near the Mrk line of sight, in order to obtain information about the.

The study of multi-wavelength flux variability in BL Lacertae objects is very important to discern unstable processes and emission mechanisms underlying their extreme observational features.

While the innermost regions of these objects are not accessible from direct observations, we may draw conclusions about their internal structure via the detection of flux variations on various timescales Author: Bidzina Kapanadze.

BL Lac, imaged by AAVSO member Chuck Pullen BL Lac: A Star With an Identity Crisis. BL Lac is an interesting star with an interesting history. It is the prototype of the BL Lac class of Active Galactic Nuclei (AGN).

You read that right, BL Lac isn't actually a star at all, but rather an extremely bright galaxy. Bright X-Ray Flares from the BL Lac Object MarkarianDetected with MAXI in January and February BL Lacertae objects: individual (Markarian ) X-ray observations have been one of the most useful tools to study the variability of blazars.

In addition, remark. Radio-bright BL Lacertae objects (BLOs) are typically very variable and exhibit prominent flaring.

We use a sample of 24 BLOs, regularly monitored at Metsaehovi Radio Observatory, to get a clear idea of their flaring behavior in the radio domain and to find possible commonalities in their variability patterns.

The jet of BL Lac approaches us within 6–10° of our line of sight at a flow speed of –c (where c is the speed of light), corresponding to a Lorentz factor of ± (ref. Cited by: The BL Lac object 3C 66A was the target of an extensive multiwavelength monitoring campaign from July through April (with a core campaign from September to December) involving observations throughout the electromagnetic spectrum.

Radio, infrared, and optical observations were carried out by the WEBT-ENIGMA collaboration. At higher energies, 3C 66Awas observed in X-rays Cited by: BL Lacertae or BL Lac is a highly variable, extragalactic active galactic nucleus (AGN or active galaxy).It was first discovered by Cuno Hoffmeister inbut was originally thought to be an irregular variable star in the Milky Way galaxy and so was given a variable starthe "star" was identified by John Schmitt at the David Dunlap Observatory as a bright, variable Constellation: Lacerta.

Nicastro et al. observed the X-rays emitted by a special type of astronomical object known as a BL Lacertae (BL Lac) object. These are typically extremely bright Cited by: 2.

We present coordinated multiwavelength observations of the bright, nearby BL Lacertae object Mrk taken in January–March, involving GASP-WEBT, Swift, NuSTAR, Fermi-LAT, MAGIC, VERITAS, and other collaborations and instruments, providing data from radio to very high energy (VHE) γ-ray bands. NuSTAR yielded previously unattainable sensitivity in the 3–79 keV range, revealing that Cited by: “X-Ray Spectroscopy of BL Lacertae Objects” C.

Urry, R. Mushotzky, and S. Holt, BAAS Meet () “X-Ray and Ultraviolet Observations of BL Lacerate Objects”Ph.D. Thesis, The Johns Hopkins University, Diss. Abstr. In the "unified model" of active galaxies, the main difference between quasars, BL Lacertae objects, and radio galaxies appears to be that we see the accretion disk around the central black hole from a different angle in each case—face-on for BL Lacertae, edge-on for radio galaxies, and in between for quasars.

The Inner Jet of an Active Galactic Nucleus as Revealed by a Radio-to-Gamma-ray Outburst: The Quasar-like Object BL Lacertae. Source: Cosmovision, a group led by Dr. Wolfgang Steffen of the Instituto de Astronomia, UNAM, Ensenada, Mexico Above: Still frame (high resolution) from animation that illustrates the discovery discussed in our paper "The Inner Jet of an Active Galactic Nucleus as.

@article{osti_, title = {CATALOG AND STATISTICAL STUDY OF X-RAY SELECTED BL LACERTAE OBJECTS}, author = {Kapanadze, Bidzina Z., E-mail: [email protected]}, abstractNote = {This paper presents a catalog of X-ray selected BL Lacerate objects (XBLs), optically identified through the end of It contains the names from different surveys, equatorial.

We have used X‐ray and VLBI observations of twenty three BL Lac objects from the 1 Jy sample of radio bright sources to test models for the orgin of X‐ray emission in BL Lacs. We find a correlation between the X‐ray luminosity and the parsec scale radio emission, consistent with the idea that the X‐rays are relativistically : R.

Kollgaard, E. Feigelson, D. Gabuzda, R. Sambruna, C. Urry. Start studying Learn vocabulary, terms, and more with flashcards, games, and other study tools. Observations indicate that BL Lacertae objects are. and BL Lacertae objects may well be the same kind of object, the different appearance of them being simply that.

No significant X-ray flux and/or spectral variability was detected. STACEE and Whipple observations provided upper flux limits at > and > GeV, respectively. Subject headings: BL Lacertae objects: individual (3C 66A) — galaxies: active — gamma rays: theory — Coordinated multiwavelength observation of 3C 66A during the WEBT.

The passage of stars across the line of sight to the quasar could account for the rapid brightness changes typically associated with BL Lacertae objects.

Ringing in an estimate of a galaxy's mass Beyond our galaxy, at a distance of more than a billion light-years, the BL Lacertae object PKS radiates profusely across the spectrum from. Quasars, BL Lacertae Objects and Seyfert Galaxies Since the total number of known quasars and BLO objects is truly ‘astronomical,’ we have, for the most part, limited the list to those described by Wolfgang Steinicke in 5, where he tabulated objects brighter than magnitude and north of.

(in reverse chronological order) I. Refereed Papers “Detecting the Birth of Supermassive Black Holes Formed from Heavy Seeds” F. Pacucci et al (13 co-authors, including C. M. Urry), Astro Decadal Survey on Astronomy and Astrophysics, Bulletin of the American Astronomical Society, 51, () “Disentangling nature from nurture: tracing the origin of seed black holes” P.The MAGIC collaboration observed BL Lacertae for hr during August to December and for 26 hr during July to September.

The source is the.j.,> the ultraviolet to infrared energy distribution of the bl lacertae object pks +00 at two different brightness levels falomo, r., tanzi, e. g. host galaxy and spectral variability of the bl lacertae object h+00 falomo, r., treves, a.