ROSAT All Sky Survey Observations of IRAS Galaxies

Boller, Th.; Meurs, E. J. A.; Brinkmann, W.; Fink, H. H.; Zimmermann, H. U.; Adorf, H. M.

doi:10.1007/978-3-642-77566-6_11

Cited by 44 publications

(94 citation statements)

References 7 publications

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“…The comparison between the ROSAT All Sky Survey (RASS) and the IRAS Point Source Catalog revealed many galaxies with X-ray luminosity in the range 10 42 -10 43 erg s −1 , which had not been previously classified as Active Galactic Nuclei (AGN) (Boller et al 1992;Boller et al 1998;hereafter B92 and B98). For many of them, this was simply due to the lack of optical spectroscopy, but for some others, the existing, low-dispersion spectra did not reveal clear characteristics of a Seyfert type nucleus.…”

Section: Introductionmentioning

confidence: 99%

ISO observations of four active galaxies

Dennefeld

Böller

Rigopoulou

et al. 2003

A&A

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Abstract. We present ISO PHOT-S spectra of four galaxies known or suspected to host a central AGN. Two of them are selected, among several others, from the initial Iras/Rosat sample of Boller et al. (1992) because of their substantial X-ray emission, while no obvious Seyfert features was present in their optical spectra: IRAS 14201+2956 and IRAS 21582+1018. The latter, also known as Mrk 520, was bright enough to also allow SWS observations around selected neon lines, to establish its excitation. While both PHOT-S spectra are characteristic of starburst-dominated galaxies, the neon line ratios in IRAS 21582+1018 indicate the presence of a hard excitation source. Complementary optical spectra, both at low and high spectral resolution, show only a weak, broad component around H α , establishing the presence of a central AGN which may not be detected in standard, classification spectra. Both objects are now classified as Sey 1.9 galaxies. These results show therefore that, although IR observations were expected to be able to pierce through the dusty central regions to reveal the presence of an active nucleus, the result may be ambiguous: the broad band IR energy distribution can still be dominated by starburts located in a wider circumnuclear region, and the AGN appear only in specific observations (high-excitation lines in the IR, or high-resolution optical spectra). As a complement, two other galaxies from the same initial sample were also observed with PHOT-S: the Narrow Line Seyfert galaxies (NLS1) Mrk 359 and Mrk 1388. NLS1s appear in high proportion in the Rosat/Iras sample, and in soft X-ray samples in general, and their Balmer line-widths are sometimes comparable to those of interacting, star-forming galaxies. Their ISO spectra however do not reveal the typical, strong PAH features found in the starburst galaxies and are more like those of standard Seyferts. All these observations therefore indicate that the key element is the presence or absence of a circumnuclear starburst region which, if strong enough, may completely hide the presence of a central AGN in the IR spectral energy distribution. The dust obscuration however needs to be patchy rather than complete to explain the detection of the high-excitation lines and Balmer wings in some cases. Only high-energy observations can then establish the strength of the central AGN and the amount of extinction with certainty.

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Section: Introductionmentioning

confidence: 99%

ISO observations of four active galaxies

Dennefeld

Böller

Rigopoulou

et al. 2003

A&A

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“…Kaz 65 (IRAS 16155+6831) was thought to be very luminous X-ray source and included in the Catalogue of cross-correlated sources from ROSAT All-Sky Survey (RASS) with the IRAS Point Source Catalogue published by Boller et al (1992). More recently, Moran et al (1994) reported Kaz 65 as a H II galaxy which was removed from the Boller's catalogue by its authors following the new processing of the RASS data.…”

Section: Comparison With Markarian and Blue Haro Galaxiesmentioning

confidence: 99%

Hydrogen content in Kazarian galaxies

Tamazian

1999

Astron. Astrophys. Suppl. Ser.

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Abstract. Several H I related astrophysical parameters such as neutral hydrogen total mass and hydrogen mean projected density, indicative total mass as well as usual ratios M H /L 0 , M H /M i and M i /L 0 for 23 galaxies from Kazarian lists are derived. Their variation ranges are rather wide almost coinciding with those for normal galaxies belonging to the same morphological types. Kazarian galaxies do not constitute a homogeneous sample by any of the commonly used H I related parameters. Comparison with Markarian and blue Haro galaxies demonstrate that Kazarian galaxies have quite similar H I properties and contain rather high relative numbers (≈ 30%) of peculiar objects. Brief comments on the peculiar galaxies Kaz 63, Kaz 65, Kaz 69 and Kaz 211 are given.

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“…The 14 315 IRAS galaxies were previously correlated with the RASS I source catalogue and the results were presented in Boller et al (1992a). The advantages of the RASS II processing with respect to the RASS I processing are discussed in the introduction of this paper.…”

Section: Comparison With Rass I Cataloguementioning

confidence: 99%

“…In a previous paper (Boller et al 1992a) we presented results of a first correlation between the ROSAT All-Sky Survey and the 14 708 extragalactic sources selected from the IRAS Point Source Catalogue (hereafter IRAS PSC). This initial correlation used the first processing of the All-Sky Survey data by the Standard Analysis Software System (RASS I) (Voges et al 1996a;Downes et al 1994) and resulted in a sample of 244 objects.…”

Section: Introductionmentioning

confidence: 99%

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ROSAT All-Sky Survey observations of IRAS galaxies

Boller

Bertoldi

Dennefeld

et al. 1998

Astron. Astrophys. Suppl. Ser.

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Abstract. The 120 000 X-ray sources detected in the RASS II processing of the ROSAT All-Sky Survey are correlated with the 14 315 IRAS galaxies selected from the IRAS Point Source Catalogue: 372 IRAS galaxies show X-ray emission within a distance of 100 arcsec from the infrared position. By inspecting the structure of the X-ray emission in overlays on optical images we quantify the likelihood that the X-rays originate from the IRAS galaxy. For 197 objects the soft X-ray emission is very likely associated with the IRAS galaxy. Their soft X-ray properties are determined and compared with their farinfrared emission. X-ray contour plots overlaid on Palomar Digitized Sky Survey images are given for each of the 372 potential identifications. All images and tables displayed here are also available in electronic form.

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ROSAT All Sky Survey Observations of IRAS Galaxies

Cited by 44 publications

References 7 publications

ISO observations of four active galaxies

ISO observations of four active galaxies

Hydrogen content in Kazarian galaxies

ROSAT All-Sky Survey observations of IRAS galaxies

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