The Quasar‐Quasar Correlation Function in the Palomar Transit Grism Survey

Kundić, Tomislav

doi:10.1086/304159

Cited by 137 publications

(214 citation statements)

References 36 publications

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“…The A component w as active (Kundic et al 1995), and also, we have not found evidences of strong microlensing in the r R comparison (Oscoz et al 1997, Goicoechea et al 1998. A similar result (417 3 days; 2 con dence level) has been derived by Kundic et al (1997). They use light curves in the g and r bands.…”

Section: Introductionsupporting

confidence: 88%

Gravitational Lenses and the Hubble Constant: Present and Future

Goicoechea

Mediavilla

Oscoz

et al. 1999

The Non-Sleeping Universe

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Section: Introductionsupporting

confidence: 88%

Gravitational Lenses and the Hubble Constant: Present and Future

Goicoechea

Mediavilla

Oscoz

et al. 1999

The Non-Sleeping Universe

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“…Our view of the universe now includes a weblike network of large-scale structures that include galaxies, clusters, and Ðlaments (Peebles 1993 ;Peacock 1999). Two-point correlation functions have been able to probe mass clustering on scales Mpc for galaxies (e.g., Small et al 1999 (Shaver 1984 ;Kundic 1997 ;La Franca, Andreani, & Cristiani 1998), and Mpc for clusters [100 (see Bahcall 1988 for a review). If X-ray sources are distributed like galaxies, then their surface density will have Ñuc-tuations caused by the large-scale structure.…”

Section: Discussionmentioning

confidence: 99%

BeppoSAXObservations of the Maser Seyfert 2 Galaxy ESO 103‐G35

Wilkes

Mathur

Fiore³

et al. 2001

ApJ

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We present results from a Chandra X-Ray Observatory study of the Ðeld X-ray source populations in four di †erent observations : two high-redshift (z D 0.5) clusters of galaxies 3C 295 and RX J003033.2]261819 ; and two noncluster Ðelds with similar exposure time. Surprisingly, the 0.5È2 keV source surface densities (D900È1200 sources deg~2 at a Ñux limit of 1.5 ] 10~15 ergs cm~2 s~1) measured in an D8@ ] 8@ area surrounding each cluster exceed by a factor of D2 the value expected on the basis of the ROSAT and Chandra log N-log S, with a signiÐcance of D2 p each, or D3.5 p when the two Ðelds are combined (i.e., a probability to be a statistical Ñuctuation of \1% and \0.04%, respectively). The same analysis performed on the noncluster Ðelds and on the outer chips of the cluster Ðelds does not show evidence of such an excess. In both cluster Ðelds, the summed 0.5È10 keV spectrum of the detected objects is well Ðtted by a power law with ! D 1.7 similar to active galactic nuclei (AGNs) and shows no sign of intrinsic absorption. The few (D10 of 35) optical identiÐcations available to date conÐrm that most of them are, as expected, AGNs, but the number of redshifts available is too small to allow conclusions on their nature. We discuss possible interpretations of the overdensity in terms of a statistical variation of cosmic background sources ; a concentration of AGNs and/or powerful starburst galaxies associated with the clusters ; and gravitational lensing of background QSOs by the galaxy clusters. All explanations, however, are difficult to reconcile with the large number of excess sources detected. Deeper X-ray observations and more redshifts measurements are clearly required to settle the issue.

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“…They are themselves not distributed at random on the sky (Chambers et al 1996;Loan et al 1997;Kundic 1997;Stephens et al 1997;Gosset et al 1997). But, in addition, a hard look around them often reveals a group or cluster of fainter non-active galaxies (Le Fèvre et al 1996;Knopp & Chambers 1997;Francis et al 1997).…”

Section: Clustering At Large Redshiftmentioning

confidence: 99%

Astrophysics in 1997

Trimble¹,

McFadden²

1998

PUBL ASTRON SOC PAC

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ABSTRACT. Martian marvels, a gamma-ray burster with a redshift, Galileo converses with Ganymede, a record galactic redshift of 4.92, and much else. Fiscal 1997 was definitely an exciting year for astronomers. We have tried hard to hit all the obvious highlights, but also to report more gradual progress on traditional problems of understanding planets, stars, galaxies, and the universe. Though the year was saddened by the loss of many valued colleagues, we nevertheless indulge in occasional soupçons of frivolity.

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The Quasar‐Quasar Correlation Function in the Palomar Transit Grism Survey

Cited by 137 publications

References 36 publications

Gravitational Lenses and the Hubble Constant: Present and Future

Gravitational Lenses and the Hubble Constant: Present and Future

BeppoSAXObservations of the Maser Seyfert 2 Galaxy ESO 103‐G35

Astrophysics in 1997

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