Ultraviolet excess objects in the region of a companion galaxy to NGC 2639

Molecular gas in the host galaxy of the lensed quasar QSO 0957+561 has been detected at the redshift of 1.414 using the IRAM Plateau de Bure interferometer. This detection shows the extended nature of the molecular gas distribution. The molecular gas mass is 2-4 109 M⊙ and it is distributed in a disk that is several kiloparsecs in diameter. A second, weaker component of CO is interpreted as arising from a close companion galaxy moving at a velocity 440 km s−1 higher than the host galaxy.

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Absorption Lines in the Spectra of the QSO PKS 1448-232

Publications of the Astronomical Society of Australia ◽

10.1017/s1323358000017185 ◽

1984 ◽

Vol 5 (3) ◽

pp. 355-359 ◽

Cited By ~ 3

Author(s):

Chen Jian-sheng ◽

Donald C. Morton ◽

Bruce A. Peterson ◽

Alan E. Wright ◽

David L. Jauncey

Keyword(s):

Radio Source ◽

Stellar Object ◽

Absorption Lines ◽

Ultraviolet Excess ◽

Low Resolution ◽

Optical Position

Savage et al. (1977) found that the radio source PKS 1448-232 coincided with a stellar object of about magnitude 16.4 having an ultraviolet excess. A low resolution spectrum obtained with the Anglo-Australian Telescope (AAT) confirmed this object as a QSO with zem = 2.22 and revealed many absorption lines short-ward of the La emission. Consequently this object was included in a programme of spectroscopy at intermediate resolution with the AAT to investigate QSO absorption lines. Savage et al. have given a finding chart with an optical position of 14h48m09s.3, −23°17′10″ (1950.0). The radio fluxes are 0.40 Jy at 2.7 GHz and 0.31 Jy at 5.0 GHz.

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The Polar-Ring Galaxies NGC 2685 and NGC 3808B (W 300)

International Astronomical Union Colloquium ◽

10.1017/s0252921100005157 ◽

1990 ◽

Vol 124 ◽

pp. 231-244

Author(s):

V. P. Reshetnikov ◽

V. A. Yakovleva

Keyword(s):

Intergalactic Medium ◽

Close Encounter ◽

Main Body ◽

Polar Plane ◽

Polar Ring ◽

Ring Galaxies ◽

Companion Galaxy ◽

Peculiar Galaxies

Polar-ring galaxies (PRG) are among the most interesting examples of interaction between galaxies. A PRG is a galaxy with an elongated main body surrounded by a ring (or a disk) of stars, gas, and dust rotating in a near-polar plane (Schweizer, Whitmore, and Rubin, 1983). Accretion of matter by a massive lenticular galaxy from either intergalactic medium or a companion galaxy is usually considered as an explanation of the observed structure of PRG. In the latter case there are two possibilities: (1) capture and merging of a neighbor galaxy, and (2) accretion of mass from a companion galaxy during a close encounter. Two PRG formation scenarios just mentioned are illustrated here by the results of our observations of the peculiar galaxies NGC 2685 and NGC 3808B.

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An abundance analysis of AK Sco, a Herbig Ae SB2 system with a magnetic component

Proceedings of the International Astronomical Union ◽

10.1017/s1743921319003831 ◽

2018 ◽

Vol 14 (A30) ◽

pp. 133-133

Author(s):

Swetlana Hubrig ◽

Fiorella Castelli ◽

Silva P. Järvinen

Keyword(s):

Magnetic Field ◽

Special Interest ◽

Weak Magnetic Field ◽

Main Sequence ◽

Secondary Component ◽

Magnetic Component ◽

Ultraviolet Excess ◽

High Eccentricity ◽

Solar Abundance ◽

Herbig Ae Stars

AbstractAK Sco is an SB2 system formed by two nearly identical Herbig Ae stars, with Teff = 6500K and log g = 4.5, surrounded by a circumbinary disk. This actively accreting system is of special interest among the pre-main-sequence binaries because of its prominent ultraviolet excess and the high eccentricity of its orbit. Moreover, recent spectropolarimetric observations using HARPSpol indicate the presence of a weak magnetic field in the secondary component (Järvinen et al. 2018). An abundance analysis of both components has shown that all elements have a solar abundance in the two stars, except for Li and Ba. These elements are enhanced by 2.2 and 0.5 dex, respectively, in the A component and by 2.4 and 0.5 dex, respectively, in the B component.

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