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Tuesday, July 21, 2020 | History

2 edition of X-ray and ultraviolet observations of BL Lacertae objects found in the catalog.

X-ray and ultraviolet observations of BL Lacertae objects

Claudia Megan Urry

X-ray and ultraviolet observations of BL Lacertae objects

by Claudia Megan Urry

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Published by Goddard Space Flight Center in Greenbelt, Md .
Written in English


Edition Notes

Thesis (Ph.D.)--Johns Hopkins University, 1984.

StatementClaudia Megan Urry.
SeriesNASA technical memorandum -- 86103
ID Numbers
Open LibraryOL14865272M

2 Optical, Ultraviolet and Infrared Observations of X-ray Binaries Fig. Distribution of different HMXB populations High-mass X-ray binaries Supergiant and Be X-ray binaries There are two main sub-groups of HMXBS - the supergiant counterparts (normally of luminosity class I or II), and the Be/X-ray (or BeX) binary systems. The nonthermal spectrum consists of synchrotron radiation in the radio to X-ray range, and inverse Compton emission in the X-ray to gamma-ray region. A thermal spectrum peaking in the ultraviolet region and faint optical emission lines are also present in OVV quasars, but faint or non-existent in BL Lac objects.

When any effort to acquire a system of laws or knowledge focusing on an astr, aster, or astro, that is, any natural body in the sky especially at night, discovers an entity emitting, reflecting, or fluorescing gamma rays, succeeds even in its smallest measurement, gamma-ray astronomy is the name of the effort and the result. Once an entity, source, or object has been detected as . 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 Author: Bidzina Kapanadze.

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 degrees declination. X-ray astronomy. See also what's at Wikipedia, your library, or elsewhere. Broader terms: Astronomy; Space astronomy; X-rays; Narrower terms: X-ray bursts; X-ray sources, Galactic.


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X-ray and ultraviolet observations of BL Lacertae objects by Claudia Megan Urry Download PDF EPUB FB2

Simultaneous X-ray, ultraviolet, and optical observations of the BL Lacertae object PKS Article (PDF Available) in The Astrophysical Journal (2) May with 13 Reads. 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 the scientific accomplishment of IUE was written in colloboration. A copy of the final draft is. 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. 0.P Coordinated Observations of /B -BY -5 yL5 X-Ray Bright BL Lacertae Objects j/6/6/ C.

Megan Uny, principal Investigator 15 September - 15 March This is a semi-annual status report to the National Aeronautics and Space Administration (NASA) concerning X-ray and ultraviolet observations of BL Lacertae objects book grant NAG This grant was awarded to Dr.

Megan Urry of the Mas. Five X-ray bright BL Lacertae objects were observed in the energy range keV with the solid state spectrometer (SSS) of the Einstein Observatory. 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 Cited by: New ROSAT PSPC soft X-ray observations are presented for complete samples of XBLs and RBLs which may explain the absence of luminous optical emission lines in BL Lacs.

A deep, subarcsec optical imaging survey of a large (50) sample of both XBLs and RBLs conducted at the Canada-France-Hawaii m Telescope (CFHT), whose purpose was to Author: John T.

Stocke. “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. LHEA contributions to the future of ultraviolet astronomy based on six years of IUE research. constraints on models of the broad emission line region / Richard Mushotzky --Very recent IUE observations of 2 BL lacertae objects / C.M datePublished\/a> \" \/span>\" ; \u00A0\u00A0\u00A0 schema:description\/a> \" Ultraviolet and x-ray.

We present UBVRI photometry of stars in the fields of 38 X-ray selected BL Lacertae objects, two X-ray selected AGNs, and one X-ray binary system (possibly a cataclysmic variable). These stars are suitable for use as photometric comparison stars for optical monitoring programs involving these X-ray selected by: BL Lacertae objects, quasars, and double-radio sources appear to be the same type of object viewed from different directions.

If one of the jets is aimed almost directly at Earth, we see a BL Lac object. If the jet is somewhat tilted to our line of sight, we see a quasar. If it is tilted farther, we see an active galaxy. @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.

Coordinated observations of X-ray bright BL Lacertae objects. No new International Ultraviolet Explorer (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 Author: C. Urry. X-ray selected BL Lacertae objects: catalogue and statistical properties B.Z.

Kapanadze∗ Advances in Astronomy and Space Physics, 2, () °c B.Z. Kapanadze, Abastumani Astrophysical Observatory at the Ilia State University, Cholokashvili Ave. 3/5, Tbilisi, Georgia The present work focuses on the statistical properties of X.

BL Lacertae objects constitute a rare class of active galactic nuclei with extreme observational features attributed to the Doppler-boosted emission from a relativistic jet, closely aligned to our line-of-sight. Their spectral energy distribution, extending over 17–19 orders of frequency from radio to the TeV energy range, is of non-thermal origin and shows a typical two-component Author: Bidzina Kapanadze.

Broad-band contemporaneous studies of X-ray bright AGN: Broadband, Bl Lacertae Objects, Brightness Distribution, Far Infrared Radiation, Peculiar Galaxies, Radio Spectra, Seyfert Galaxies, Ultraviolet Spectra: Bibliographic Code: : Abstract Multiwaveband contemporaneous observations have been collected for the three X-ray.

Various papers on active galactic nuclei (AGN) are presented. The topics addressed include: radio observations of AGN, VLA observations of 4Cthe low frequency variable source 3Cyoung supernovae in the star burst galaxy M82, radio emission from the nuclei of Sbc galaxies, MERLIN observations of the radio structure of Seyfert nuclei, properties of the radio Cited by: 3.

The X-ray flux dipole of AGNs and the peculiar motion of the local group / (Greenbelt, MD: Laboratory for High Energy Astrophysics, NASA/Goddard Space Flight Center, []), by Takamitsu Miyaji, Elihu Boldt, and Laboratory for High Energy Astrophysics (Goddard Space Flight Center) (page images at HathiTrust).

@article{osti_, title = {RADIO-WEAK BL LAC OBJECTS IN THE FERMI ERA}, author = {Massaro, F. and Marchesini, E. and D’Abrusco, R. and Smith, Howard A. and Masetti, N. and Andruchow, I.}, abstractNote = {The existence of “radio-weak BL Lac objects” (RWBLs) has been an open question, and has remained unsolved since the discovery that quasars could be radio.

X-ray studies of BL Lacertae objects with the Einstein Observatory - Confrontation with the synchrotron self-Compton predictions : 00/ A GORENSTEIN, P. X rays beyond the Milky Way Ultraviolet and X-ray observations of the BL Lac object PKS 05 ApJ S:.

spectrum radio quasars and BL Lac objects. Of the VHE -ray emitting blazars, the 55 BL Lac objects form the majority. The spectral energy distribution (SED) of the blazars shows two peaks; one in the infra-red to X-ray range and the sec-ond in the X-ray to -rays.

The first peak is synchrotron emis-Cited by: We present optical observations of BL Lacertae (BL Lac) in the standard BVRI bands with the 80 cm Tsinghua Centre for Astrophysics-National Astronomical Observatories of China telescope.

InBL Lac was monitored for 25 nights, between September and November, to study its long-term optical variability by: 6.Ultraviolet Spectrophotometry of 2A A Bulge on the Multifrequency Observations of the BL Lacertae Objects OQ and ON (w/ D.M. Worrall, J.J. Puschell, F.C. Bruhweiler, M.L.

p. 37 Book Chapter EXOSAT X-ray Observations of the Eclipsing Magnetic Cataclysmic Variable EX Hya (w/.