Photometry and spectroscopy of two compact groups of galaxies SH 354 and SH 355

Tiersch, H.; Oleak, H.; Stoll, D.; Neizvestny, S. I.; Amirkhanian, A. S.; Egikian, A. G.

doi:10.1007/bf02044721

Cited by 3 publications

(4 citation statements)

References 3 publications

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“…Mainly for this reason, and probably for very unusual supposed composition the ShCGs attracted little attention until recently. The redshifts of only about 70 relatively bright and nearby ShCGs have been measured so far (Robinson & Wampler 1973;Arp et al 1973;Mirzoyan et al 1975;Amirkhanian & Egikian 1987;Amirkhanian 1989;Kodaira et al 1988Kodaira et al , 1990Kodaira & Sekiguchi 1991;Lynds et al 1990;del Olmo & Moles 1991;Tiersch et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Radio Emission of Shakhbazian Compact Galaxy Groups

Tovmassian

Chavushyan

Верходанов

et al. 1999

ApJ

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Three hundred fifty three radio sources from the NRAO VLA Sky Survey (NVSS) the FIRST Survey (White et al. 1997), are detected in the areas of 179 Shakhbazian Compact Groups (ShCGs) of galaxies. Ninety three of them are identified with galaxies in 74 ShCGs. Six radio sources have complex structure. The radio spectra of 22 sources are determined. Radio luminosities of galaxies in ShCGs are in general higher than that of galaxies in Hickson Compact Groups (HCGs).The comparison of radio (at 1.4 GHz) and FIR (at 60 µm) fluxes of ShCG galaxies with that of HCG galaxies shows that galaxies in ShCGs are relatively stronger emitters at radio wavelengths, while galaxies in HCGs have relatively stronger FIR emission. The reasons of such difference is discussed.

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Section: Introductionmentioning

confidence: 99%

Radio Emission of Shakhbazian Compact Galaxy Groups

Tovmassian

Chavushyan

Верходанов

et al. 1999

ApJ

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“…Recent studies (Tiersch et al 1997) show that a significant fraction of Shakhbazian groups contain emissionline objects, including some Seyfert galaxies. Emission-line galaxies have been found in approximately one third (12 out of 36) of SCGGs which have been investigated spectroscopically to date.…”

Section: Discussionmentioning

confidence: 99%

Far-infrared emission from Shakhbazian Compact Galaxy Groups

Tovmassian¹,

Mazzarella

Tovmassian³

et al. 1998

Astron. Astrophys. Suppl. Ser.

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Abstract. Using the IRAS archives, we searched for farinfrared (FIR) counterparts of Shakhbazian Compact Groups of Galaxies (SCGGs). Reliable IRAS detections are identified at the positions of 24 out of 367 SCGGs; another 10 IRAS sources, located within ∼ 2 arcmin of SCGGs, are possibly associated with the corresponding galaxy groups. Some of these sources are not very reliable. Previous work has shown that the fraction of E and S0 galaxies in a representative sample of SCGGs is 77%, while E and S0 galaxies comprise about 51% of galaxies in Hickson Compact Groups (HCGs). The higher fraction of early Hubble types, combined with their greater distances, explains the low IRAS detection rate of SCGGs (7 − 8%) compared to HCGs (64%). The FIR colors and morphological types of galaxies in the groups suggest that active star formation or Seyfert galaxies may be the main source of the FIR emission in the SCGGs detected by IRAS, perhaps originating as the result of tidal interactions in the dense environments of these groups.

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“…Hickson 1993; Hickson "1997) not many SHCGs of galaxies have been investigated photometrically and spectroscopically till quite recently (Tiersch et al 1998 and references therein). For this reason a program has been started in the University of Potsdam, Potsdam Astrophysikalisches Institut in cooperation with other observatories to obtain photometric and spectroscopic properties of the galaxies in SHCGs (Tiersch et al 1994;Oleak et al 1995;Tiersch et al 1995).The main goal of our program is to study the physical nature of these groups, their past and future evolutionary histories. With this purpose it is necessary to know the morphology of member galaxies, the photometric data, i. e. B, V, R apparent magnitudes, radial velocities, velocity dispersion, mass-to-Iuminosity ratio, crossing times, dynamics, chemical abundance, metallicity as well as the evolution effects.…”

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confidence: 99%

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confidence: 99%

Emission-Line Galaxies in Shahbazian Compact Groups

Tiersch

Stoll

Neizvestny

et al. 1999

Symp. - Int. Astron. Union

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Based on the CCD photometric and spectroscopic observations taken with 1.23 m and 2.2 m telescopes at the German-Spanish Astronomical Center in Calar-Alto (Almeria, Spain) as well as with the 1.54 m telescope at the European Southern Observatory (La Silla, Chile) some emission-line galaxies (ELGs) surprisingly have been found in Shahbazian compact groups of galaxies (SHCGs) by our research group. . The majority of galaxies in the SHCGs usually have an absorption spectra typical of ellipticals and SOs. But some of these objects turn out to be the ELGs including two broad-line AGNs (of classical Seyfert 1 type) and the narrow emission-line galaxies. Their redshift makes these galaxies a physical member of the host group.Unlike well studied Hickson compact groups (HCGs) (see e.g. Hickson 1993; Hickson "1997) not many SHCGs of galaxies have been investigated photometrically and spectroscopically till quite recently (Tiersch et al. 1998 and references therein). For this reason a program has been started in the University of Potsdam, Potsdam Astrophysikalisches Institut in cooperation with other observatories to obtain photometric and spectroscopic properties of the galaxies in SHCGs (Tiersch et al. 1994;Oleak et al. 1995;Tiersch et al. 1995).The main goal of our program is to study the physical nature of these groups, their past and future evolutionary histories. With this purpose it is necessary to know the morphology of member galaxies, the photometric data, i. e. B, V, R apparent magnitudes, radial velocities, velocity dispersion, mass-to-Iuminosity ratio, crossing times, dynamics, chemical abundance, metallicity as well as the evolution effects.Three-colour (B, V, R) photometric and spectroscopic observations have been carried out at Calar Alto and La Silla Observatories by Tiersch and Stoll. The data reduction procedure used the MIDAS software package at Potsdam Astrophysikalisches Institut.

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Photometry and spectroscopy of two compact groups of galaxies SH 354 and SH 355

Cited by 3 publications

References 3 publications

Radio Emission of Shakhbazian Compact Galaxy Groups

Radio Emission of Shakhbazian Compact Galaxy Groups

Far-infrared emission from Shakhbazian Compact Galaxy Groups

Emission-Line Galaxies in Shahbazian Compact Groups

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