Crystallographic relationships for the Lee-Leighly mechanism in UAI4

Leighly, H. P.; Edwards, D. R.

doi:10.1007/bf02648547

Cited by 6 publications

(8 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These contrast markedly with periods of reduced variability, which seem to occur preferentially before and after the flares and most notably during a period of about 30 days starting at about TJD 9900. A discussion and interpretation of this distinctive variability is given in Leighly & O'Brien (1997).…”

Section: Variabilitymentioning

confidence: 99%

See 1 more Smart Citation

X‐Ray Observations of the Broad‐Line Radio Galaxy 3C 390.3

Leighly¹,

O’Brien²,

George³

et al. 1997

ApJ

View full text Add to dashboard Cite

We present the data and preliminary analysis for a series of 90 ROSAT HRI and two ASCA observations of the broad-line radio galaxy 3C 390.3. These data were obtained during the period 1995 January 2 to 1995 October 6 as part of an intensive multiwavelength monitoring campaign. The soft X-ray flux in the ROSAT band varied by nearly a factor of four during the campaign, and the well-resolved light-curve shows several distinct features. Several large amplitude flares were observed, including one in which the flux increased by a factor of about 3 in 12 days. Periods of reduced variability were also seen, including one nearly 30 days long. While the HRI hardness

show abstract

Section: Variabilitymentioning

confidence: 99%

“…This paper presents the ROSAT data as well as two ASCA observations obtained during the monitoring period. The soft X-ray variability is briefly described, but the results of the detailed timing analysis, and the results from the optical, UV and radio monitoring will be reported elsewhere (Leighly & O'Brien 1997, Dietrich et al 1997, Leighly et al 1997).…”

mentioning

confidence: 99%

X‐Ray Observations of the Broad‐Line Radio Galaxy 3C 390.3

Leighly¹,

O’Brien²,

George³

et al. 1997

ApJ

View full text Add to dashboard Cite

show abstract

“…The best known X-ray property of NLS1 galaxies is the presence of a soft X-ray excess (Brandt et al 1994)). NLS1 galaxies also exhibit unusually strong X-ray variability (Boller 1997;Leighly 1999). Finally, NLS1 galaxies are known to generally exhibit steeper hard (2-10 keV) X-ray spectra than broad-line Seyfert 1 galaxies (Brandt, Mathur & Elvis 1997).…”

Section: Introductionmentioning

confidence: 97%

Optical Properties of Radio-selected Narrow-Line Seyfert 1 Galaxies

Whalen¹,

Laurent-Muehleisen²,

Moran³

et al. 2006

Astron J

View full text Add to dashboard Cite

We present results from the analysis of the optical spectra of 47 radio-selected narrow-line Seyfert 1 galaxies (NLS1s). These objects are a subset of the First Bright Quasar Survey (FBQS) and were initially detected at 20 cm (flux density limit ∼ 1 mJy) in the VLA FIRST Survey. We run Spearman rank correlation tests on several sets of parameters and conclude that, except for their radio properties, radio-selected NLS1 galaxies do not exhibit significant differences from traditional NLS1 galaxies. Our results are also in agreement with previous studies suggesting that NLS1 galaxies have small black hole masses that are accreting very close to the Eddington rate. We have found 16 new radio-loud NLS1 galaxies, which increases the number of known radio-loud NLS1 galaxies by a factor of ∼ 5. Subject headings: galaxies: Seyfert -quasars: emission linesIt is not well understood at present what mechanism drives these differences between normal broad-lined Seyfert 1 and NLS1 galaxies. Two opposing models exist, each with their own successes

show abstract

“…The spectra were therefore intercalibrated by using the narrow forbidden emission lines. 3C 390.3 was also observed with IUE for 14 months (O'Brien et al 1996) and with ROSAT for nine months in 1995 (Leighly et al 1996). Radio data were also obtained during a 3-month MERLIN campaign.…”

Section: Observations and Analysismentioning

confidence: 73%

First Results of Optical Monitoring of 3C 390.3

Dietrich¹,

O’Brien

Leighly

1997

International Astronomical Union Colloquium

View full text Add to dashboard Cite

In late autumn 1994, the International AGN Watch started a multiwavelength monitoring campaign on 3C 390.3, the first radio-loud AGN to be selected for high temporal-resolution monitoring from the radio domain to X-ray energies. This AGN is is of particular interest since significant variations have been observed on both short and long time scales in both the line fluxes and line profiles (Barr et al. 1980, Veilleux & Zheng 1991).In the optical, spectroscopic data and broad-band flux measurements in B, V, R, and I were obtained. The brightness of 3C 390.3 was calculated relative to the stars in the field. The R magnitudes are based on observations recorded at Calar Alto, Spain, in 1994 December. Generally, AGN spectra are intercalibrated using narrow forbidden emission lines since these lines can be taken as constant on time scales of decades (Peterson 1993). Since the [O III] λλ4959, 5007 flux is variable on time scales of several months (Zheng et al. 1995), these lines were studied in detail. We found that they were constant within ~2% during 1995 (Dietrich et al. 1996). The spectra were therefore intercalibrated by using the narrow forbidden emission lines. 3C 390.3 was also observed with IUE for 14 months (O’Brien et al. 1996) and with ROSAT for nine months in 1995 (Leighly et al. 1996). Radio data were also obtained during a 3-month MERLIN campaign.

show abstract

Crystallographic relationships for the Lee-Leighly mechanism in UAI4

Cited by 6 publications

References 3 publications

X‐Ray Observations of the Broad‐Line Radio Galaxy 3C 390.3

X‐Ray Observations of the Broad‐Line Radio Galaxy 3C 390.3

Optical Properties of Radio-selected Narrow-Line Seyfert 1 Galaxies

First Results of Optical Monitoring of 3C 390.3

Contact Info

Product

Resources

About