Pipeline Reduction of Long-Slit Spectra Obtained with the SALT Telescope

Knyazev, A. Yu.

doi:10.1134/s1990341322030075

Cited by 8 publications

(1 citation statement)

References 4 publications

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“…The slit was aligned along the major isophotal axis of the galaxy with PA = 285°. The primary, preliminary, and long-slit reduction of the spectra was carried out using the procedure described in Kniazev (2022). We also corrected the science spectra for scattered light in the instrument using the approach presented in Katkov et al (2019).…”

Section: Salt Long-slit Spectroscopymentioning

confidence: 99%

Probing the History of the Galaxy Assembly of the Counterrotating Disk Galaxy PGC 66551

Katkov,

Gasymov,

Kniazev

et al. 2024

ApJ

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Stellar counterrotation in disk galaxies directly relates to the complex phenomenon of the disk mass assembly believed to be driven by external processes, such as accretion and mergers. The study of such systems makes it possible to reveal the source of external accretion and establish the details of this process. In this paper, we investigate the galaxy PGC 66551 (MaNGA ID 1-179561), which hosts two large-scale counterrotating (CR) stellar disks identified in the Sloan Digital Sky Survey MaNGA data and then confirmed using deep follow-up spectroscopy with the 10 m Southern African Large Telescope. We measured the properties of ionized gas and stellar populations of both CR disks in PGC 66551. We found that the CR disk is compact, contains young stars with subsolar metallicity, and has a stellar mass of 5 × 109 M ⊙, which amounts to ≈20% of the galaxy’s total. Surprisingly, the main 8 Gyr old disk has a significantly lower metallicity of −0.8 dex than other CR galaxies. We developed a simple analytic model of the history of the metal enrichment, which we applied to PGC 66551 and constrained the parameters of the galactic outflow wind, and estimated the metallicity of the infalling gas that formed the CR disk to be −0.9... −0.5 dex. Our interpretation prefers a merger with a gas-rich satellite over cold accretion from a cosmic filament as a source of gas, which then formed the CR disk in PGC 66551.

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Section: Salt Long-slit Spectroscopymentioning

confidence: 99%

Probing the History of the Galaxy Assembly of the Counterrotating Disk Galaxy PGC 66551

Katkov,

Gasymov,

Kniazev

et al. 2024

ApJ

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Peekaboo: the extremely metal poor dwarf galaxy HIPASS J1131-31

Караченцев

Макарова

Koribalski

et al. 2022

Monthly Notices of the Royal Astronomical Society

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The dwarf irregular galaxy HIPASS J1131–31 was discovered as a source of HI emission at low redshift in such close proximity of a bright star that we call it Peekaboo. The galaxy resolves into stars in images with Hubble Space Telescope, leading to a distance estimate of 6.8 ± 0.7 Mpc. Spectral optical observations with the Southern African Large Telescope reveal HIPASS J1131–31 to be one of the most extremely metal-poor galaxies known with the gas-phase oxygen abundance 12+log(O/H) = 6.99±0.16 dex via the direct [OIII] 4363 line method and 6.87±0.07 dex from the two strong line empirical methods. The red giant branch of the system is tenuous compared with the prominence of the features of young populations in the color-magnitude diagram, inviting speculation that star formation in the galaxy only began in the last few Gyr.

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SALT spectroscopy of the HMXB associated with the LMC supernova remnant MCSNR J0513−6724

Gvaramadze

Knyazev

Castro

et al. 2023

Monthly Notices of the Royal Astronomical Society

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We report the results of optical échelle spectroscopy with the Southern African Large Telescope (SALT) of the mass donor star BSDL923 in the neutron star (NS) high-mass X-ray binary XMMU J051342.6−672412 associated with the LMC supernova remnant (SNR) MCSNR J0513−6724. We found that BSDL923 is a B0.7 III star with double peaked emission lines originating in a circumbinary disk-like structure. Modelling with the stellar atmosphere code fastwind was used to derive Teff = 27000 K, log g = 3.22, vsin i ≈ 100 km s−1 and $\log (L_*/\rm \, L_\odot )=5.46$ of BSDL923, as well as to show that the surface of this star is polluted with α-elements from the supernova ejecta. We found also that the NS is orbiting BSDL923 in an eccentric orbit with the orbital period of 1.280 d and the semi-major axis of $17\pm 3 \, \rm \, R_\odot$, which is less than or equal to the radius of BSDL923 of $25\pm 5 \, \rm \, R_\odot$. We speculate that the NS is embedded in the atmosphere of BSDL923 either because it was kicked at birth towards this star or because of inflation of BSDL923 caused by the energy input from the supernova blast wave. Using long-slit spectroscopy with SALT, we searched for possible signs of the SNR shell in the 2D spectrum, but did not find them. This lack of detection is consistent with the young age of this SNR, implying that it is still in the adiabatic phase.

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Pipeline Reduction of Long-Slit Spectra Obtained with the SALT Telescope

Cited by 8 publications

References 4 publications

Probing the History of the Galaxy Assembly of the Counterrotating Disk Galaxy PGC 66551

Probing the History of the Galaxy Assembly of the Counterrotating Disk Galaxy PGC 66551

Peekaboo: the extremely metal poor dwarf galaxy HIPASS J1131-31

SALT spectroscopy of the HMXB associated with the LMC supernova remnant MCSNR J0513−6724

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