Accurate optical positions for 2978 objects from the Second Byurakan Survey (SBS)
with the Digitized Sky Survey

Bicay, M. D.; Stepanian, J. A.; Chavushyan, V.; Erastova, L. K.; Ayvazyan, V. T.; Seal, James; Kojoian, G.

doi:10.1051/aas:2000295

Cited by 23 publications

(20 citation statements)

References 11 publications

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“…Using these data, the position of this source can be determined with an accuracy up to a few arcseconds and it can be unambiguously identified with the bright nearby galaxy MCG+09-21-096. This was previously classified as an emission-line galaxy in the Second Burakan Spectral Survey (Markaryan et al 1983(Markaryan et al -1985Bicay et al 2000). The spectrum of this galaxy contains broad Balmer and narrow emission lines, suggesting that this object is a type-1 Seyfert.…”

Section: Resultsmentioning

confidence: 80%

“…We retrieved all of the necessary additional publicly available data from the HEASARC archive. 1 For the optical observations, we primarily chose the sources whose positions were improved in one way or another. All of the optical data were obtained with the medium-and low-resolution spectrometer TFOSC 2 of the 1.5-m Russian-Turkish Telescope (RTT-150).…”

Section: Observationsmentioning

confidence: 99%

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New active galactic nuclei among the INTEGRAL and SWIFT X-ray sources

et al. 2008

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Abstract-We present the results of our optical identifications of a set of X-ray sources from the INTE-GRAL and SWIFT all-sky surveys. The optical data have been obtained with the 1.5-m Russian-Turkish Telescope (RTT-150). Nine X-ray sources have been identified with active galactic nuclei (AGNs). Two of them are located in the nearby spiral galaxies MCG-01-05-047 and NGC 973 seen almost edge-on. One source, IGR J16562-3301, is probably a BL Lac object (blazar). The remaining AGNs are observed as the starlike nuclei of spiral galaxies whose spectra exhibit broad emission lines. The relation between the hard X-ray (17-60 keV) luminosity and the [O III] 5007 line luminosity, log L X /L [O III] ≈ 2.1, holds good for most of the AGNs detected in hard X rays. However, the luminosities of some AGNs deviate from this relation. The fraction of such objects can reach ∼20%. In particular, the [O III] line flux is lower for two nearby edge-on spiral galaxies. This can be explained by the effect of absorption in the galactic disks.

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Section: Resultsmentioning

confidence: 80%

Section: Observationsmentioning

confidence: 99%

New active galactic nuclei among the INTEGRAL and SWIFT X-ray sources

et al. 2008

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“…The database of 1544 Markarian galaxies ( Petrosian et al 2005b); 2. The database of 1401 Second Byurakan Survey (SBS) galaxies (Bicay et al 2000);…”

Section: The Samplesmentioning

confidence: 99%

Active and Star-forming Galaxies and Their Supernovae

Петросян¹,

Navasardyan²,

McLean³

et al. 2005

Astron J

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To investigate the extent to which nuclear starbursts or other nuclear activity may be connected with enhanced star formation activity in the host galaxy, we perform a statistical investigation of supernovae (SNe) discovered in host galaxies from four samples: the Markarian galaxies sample, the Second Byurakan Survey (SBS) sample, the north Galactic pole ( NGP) sample of active or star-forming galaxies, and the NGP sample of normal galaxies. Forty-seven SNe in 41 Mrk galaxies, 10 SNe in six SBS galaxies, 29 SNe in 26 NGP active or star-forming galaxies, and 29 SNe in 26 NGP normal galaxies have been studied. We find that the rate of SNe, particularly core-collapse ( Types Ib/c and II) SNe, is higher in active or star-forming galaxies in comparison with normal galaxies. Active or star-forming host galaxies of SNe are generally of later morphological type and have lower luminosity and smaller linear size than normal host galaxies of SNe. The radial distribution of SNe in active and star-forming galaxies shows a higher concentration toward the center of the active host galaxy than is the case for normal host galaxies, and this effect is more pronounced for core-collapse SNe. Ib/c-type SNe have been discovered only in active and star-forming galaxies of our samples. About 78% of these SNe are associated with H ii regions or are located very close to the nuclear regions of these active galaxies, which are in turn hosting AGNs or starburst nuclei. Besides these new results, our study also supports the conclusions of several other earlier papers. We find that Type Ia SNe occur in all galaxy types, whereas core-collapse SNe of Types Ib/c and II are found only in spiral and irregular galaxies. The radial distribution of Type Ib SNe in their host galaxies is more centrally concentrated than that of Type II and Ia SNe. The radial distances of Types Ib/c and II SNe, from the nuclei of their host galaxies, is larger for barred spiral hosts. Core-collapse SNe are concentrated in spiral arms and are often close to or in the H ii regions, whereas Type Ia SNe show only a loose association with spiral arms and no clear association with H ii regions.

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“…7, Bicay et al 2000) was discovered in the course of the Second Byurakan Survey (SBS) (Markarian & Stepanian 1983;Lipovetsky et al 1988) as a galaxy with strong emission lines, weak continuum and ultraviolet excess seen in a chain of H  regions embedded within an extended blue low-surface-brightness (LSB) component. Up to now SBS 1129+576 has not been studied in detail.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic and photometric studies of low-metallicity star-forming dwarf galaxies

Гусева

Papaderos

Izotov

et al. 2003

A&A

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Abstract. Spectroscopy and V, I CCD photometry of the dwarf irregular galaxy SBS 1129+576 are presented for the first time. The CCD images reveal a chain of compact H  regions within the elongated low-surface-brightness (LSB) component of the galaxy. Star formation takes place mainly in two high-surface-brightness H  regions. The mean (V − I) colour of the LSB component in the surface brightness interval µ V between 23 and 26 mag arcsec −2 is relatively blue ∼0.56 ± 0.03 mag, as compared to the (V − I) ∼ 0.9-1.0 for the majority of known dwarf irregular and blue compact dwarf (BCD) galaxies. Spectroscopy shows that the galaxy is among the most metal-deficient galaxies with an oxygen abundance 12 + log (O/H) = 7.36 ± 0.10 in the brightest H  region and 7.48 ± 0.12 in the second brightest H  region, or 1/36 and 1/28 of the solar value , respectively. Hβ and Hα emission lines and Hδ and Hγ absorption lines are detected in a large part of the LSB component. We use two extinction-insensitive methods based on the equivalent widths of (1) emission and (2) absorption Balmer lines to put constraints on the age of the stellar populations in the galaxy. In addition, we use two extinction-dependent methods based on (3) the spectral energy distribution (SED) and (4) the (V − I) colour. Several scenarios of star formation were explored using all 4 methods. The observed properties of the LSB component can be reproduced by a stellar population forming continuously since 10 Gyr ago, provided that the star formation rate has increased during the last 100 Myr by a factor of 6 to 50 and no extinction is present. However, the observational properties of the LSB component in SBS 1129+576 can be reproduced equally well by continuous star formation which started not earlier than 100 Myr ago and stopped at 5 Myr, if some extinction is assumed. Hence, the ground-based spectroscopic and photometric observations are not sufficient for distinguishing between a young and an old age for SBS 1129+576.

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Accurate optical positions for 2978 objects from the Second Byurakan Survey (SBS) with the Digitized Sky Survey

Abstract: Abstract. Optical positions of 2978 objects listed in the Second Byurakan Survey (SBS) were obtained using the Digitized Sky Survey (DSS), and are given with an rms uncertainty ∼ 1 arcsec in each coordinate.

Cited by 23 publications

References 11 publications

New active galactic nuclei among the INTEGRAL and SWIFT X-ray sources

New active galactic nuclei among the INTEGRAL and SWIFT X-ray sources

Active and Star-forming Galaxies and Their Supernovae

Spectroscopic and photometric studies of low-metallicity star-forming dwarf galaxies

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