X-Ray–emitting QSO[CLC]s[/CLC] Ejected from Arp 220

Arp, Halton; Burbidge, E. M.; Chu, Youqun; Zhu, Xiaoshuai

doi:10.1086/320499

Cited by 27 publications

(23 citation statements)

References 15 publications

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“…Moreover, they are point-like objects (FWHM equal to the seeing: ≈1.0 ) which is another expected feature in this kind of objects. Other authors (Burbidge 1995(Burbidge , 1997Arp et al 2001) have also reported the detection of quasars/Seyferts 1 apparently ejected by a parent Seyfert galaxy.…”

Section: Discrepant Redshiftsmentioning

confidence: 90%

Two emission line objects with ${\vec z}>\mathsf{0.2}$ in the optical filament apparently connecting the Seyfert galaxy NGC 7603 to its companion

López-Corredoira

Gutiérrez

2002

A&A

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Abstract. We present new spectroscopic observations of an old case of anomalous redshift -NGC 7603 and its companion. The redshifts of the two galaxies which are apparently connected by a luminous filament are z = 0.029 and z = 0.057 respectively. We show that in the luminous filament there are two compact emission line objects with z = 0.243 and z = 0.391. They lie exactly on the line traced by the filament connecting the galaxies. As far as we are aware, this is the most impressive case of a system of anomalous redshifts discovered so far.

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Section: Discrepant Redshiftsmentioning

confidence: 90%

Two emission line objects with ${\vec z}>\mathsf{0.2}$ in the optical filament apparently connecting the Seyfert galaxy NGC 7603 to its companion

López-Corredoira

Gutiérrez

2002

A&A

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“…The pattern of quasars of similar redshift paired across active and ejecting galaxies of much lower redshift has been recorded many times now (Arp, 1967(Arp, , 1998(Arp, , 2003Burbidge, 1997;Radecke, 1997;Arp et al, 2001Arp et al, , 2002. Quasars also have been associated with radio and X-ray ejections from the beginning.…”

Section: Relation To Previous Associations Of Quasars With Low Redshimentioning

confidence: 82%

Quasars Associated with NGC 613, NGC 936 and NGC 941

Arp

2006

Astrophys Space Sci

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The association of low redshift, active galaxies with high redshift quasars is here tested in two regions uniformly surveyed for quasars to faint limits. Three active galaxies in these regions all show significant association with nearby quasars. Radio, optical and X-ray data available for these galaxies give new information on the processes which accompany the proposed ejection of the quasars. It is concluded that the quasars are originally relatively compact compared to the galactic medium through which they exit but can be slowed. It is argued that effects of ejection can be seen on the galaxies and may be connected with spiral structure. Evidence for periodicity of the redshifts is discussed.

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“…Existence of periodicities in the redshift (Þ) distribution of QSOs has been claimed since a long time (Burbidge & Burbidge 1967;Cowan 1969;Lake & Roeder 1972;Burbidge & O'Dell 1972;Barnothy & Barnothy 1976;Karlsson 1977Karlsson , 1990Arp et al 1990), while peaks and troughs in the Þ-distribution that are responsible for exhibiting periodicities have also been shown to be due to the presence of various selection effects (Basu 1973(Basu , 1975(Basu , 1978a(Basu , 1978b(Basu , 1985(Basu , 1992(Basu , 1999Willy & Ricklefs 1976;Box & Roeder 1984;Scott 1991). These studies include samples involving the total number of QSOs known at that time, as well as individual samples of QSOs spanning limited redshift ranges.…”

Section: Introductionmentioning

confidence: 99%

“…A × is a quantitative measure of search lines available for identification with observed lines and is computed as the number of search lines (with 'weights' between 0 to 2) lying within the observing window at a particular redshift range (Basu 1973). A × has explained (Basu 1999) the peaks and troughs in the redshift distribution for individual samples of Arp et al (1990) and Karlsson (1990). It may be mentioned that one of the two samples in Karlsson (1990), viz.…”

Section: Introductionmentioning

confidence: 99%

“…It may be mentioned that one of the two samples in Karlsson (1990), viz. the sample B, is the same as a sample in Arp et al (1990) except for the addition of only six objects which are not expected to change the results presented in Basu (1999). (U-B) Ä = U Ä -B Ä , where U Ä and B Ä are computed as the number of emission lines (with 'weights' between 0 to 2, as for A × ), entering the U and B filters respectively at a particular redshift range (Basu 1975).…”

Section: Introductionmentioning

confidence: 99%

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Periodicity versus selection effects in the redshift distribution of QSOs

Basu

2001

Astron. Nachr.

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Periodicities and selection effects in the redshift (z) distribution of QSOs have been debated for a long time in the literature. Here we show that peaks and troughs in the redshift distribution of three new samples, claimed to demonstrate the existence of a periodicity, can be interpreted in terms of known selection effects. This analysis confirms earlier findings that the presence of such selection effects seriously weakens any suggestion for periodicity of the form Δl n (1 + z) = constant.

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X-Ray–emitting QSO[CLC]s[/CLC] Ejected from Arp 220

Cited by 27 publications

References 15 publications

Two emission line objects with ${\vec z}>\mathsf{0.2}$ in the optical filament apparently connecting the Seyfert galaxy NGC 7603 to its companion

Two emission line objects with ${\vec z}>\mathsf{0.2}$ in the optical filament apparently connecting the Seyfert galaxy NGC 7603 to its companion

Quasars Associated with NGC 613, NGC 936 and NGC 941

Periodicity versus selection effects in the redshift distribution of QSOs

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