A spectroscopic study of the peculiar galaxy UGC 5600

Shalyapina, L. V.; Моисеев, А. В.; Yakovleva, V. A.

doi:10.1134/1.1491967

Cited by 6 publications

(4 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As pointed out by authors, taking into account the ring brightness, such value is somewhat lower than that expected by the metallicity-luminosity relation. A spectroscopic study of the peculiar galaxy UGC5600, classified as probable PRG (Whitmore et al 1990), by Shalyapina et al (2002) reports a quasi-solar metallicity for such object, 12+log(O/H) ∼ 8.8 = 0.9Z ⊙ , which is consistent with its high luminosity (M B = −19.4), but it is larger with respect to the values of other PRGs given before.…”

Section: -Metallicity-luminosity Relationmentioning

confidence: 67%

Metallicity of the Polar Disk in NGC4650A: Constraints for Cold Accretion Scenario

Spavone¹,

Iodice²,

Arnaboldi³

et al. 2010

AIP Conference Proceedings

View full text Add to dashboard Cite

The aim of the present study is to test whether the cold accretion of gas through a "cosmic filament" (Macciò et al. 2006) is a possible formation scenario for the polar disk galaxy NGC 4650A. If polar disks form from cold accretion of gas, the abundances of the HII regions may be similar to those of very late-type spiral galaxies, regardless of the presence of a bright central stellar spheroid, with total luminosity of few 10 9 L ⊙ .We use deep long slit spectra obtained with the FORS2 spectrograph at the VLT in the optical and near-infrared wavelength ranges for the brightest HII regions in the disk polar disk of NGC 4650A. The strongest emission lines ([OII] H β , [OIII], H α ) were used to derived oxygen abundances, metallicities and the global star formation rates for the disk. The deep spectra available allowed us to measure the Oxygen abundances (12 + log(O/H)) using the Empirical method based on intensities of the strongest emission lines, and the Direct method, based on the determination of the electron temperature from the detection of weak auroral lines, as the [OIII] at 4363Å.The Oxygen abundance measured for the polar disk is then compared with those measured for different galaxy types of similar total luminosities, and then compared against the predictions of different polar ring formation scenarios. -2 -The average metallicity values for the polar disk in NGC 4650A is Z = 0.2Z ⊙ , and it is lower that the values measured for ordinary spirals of similar luminosity. Moreover the gradient of the metallicity is flat along the polar disk major axis, which implies none or negligible metal enrichment from the stars in the older central spheroid.The low metallicity value in the polar disk NGC 4650A and the flat metallicity gradient are both consistent with a later infall of metal-poor gas, as expected in the cold accretion processes.

show abstract

Section: -Metallicity-luminosity Relationmentioning

confidence: 67%

Metallicity of the Polar Disk in NGC4650A: Constraints for Cold Accretion Scenario

Spavone¹,

Iodice²,

Arnaboldi³

et al. 2010

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…Some other works have determined the oxygen abundance in PRGs in order to test possible formation scenarios for these objects. For example, using an O/H– N 2 calibration, Shalyapina, Moiseev & Yakovleva () have found the oxygen abundance of 12+log(O/H) ∼ 8.8 dex for the PRG UGC 5600. Using a calibration between the electron temperature and strong oxygen emission lines, Brosch et al () have found that oxygen abundance in different regions of the apparent ring galaxy SDSSJ075234.33+292049.8 is 12+log(O/H) = 8.49 ± 0.08 dex.…”

Section: Resultsmentioning

confidence: 99%

Imagery and long-slit spectroscopy of the polar ring galaxy AM 2020-504

Freitas-Lemes

Rodrigues

Faúndez-Abans

et al. 2012

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

Interactions between galaxies are very common. There are special types of interactions that produce systems called polar ring galaxies (PRGs), composed of a lenticular, elliptical or spiral host galaxy, surrounded by a ring of stars and gas, orbiting in an approximately polar plane.In this paper, we study AM 2020-504, a PRG with an elliptical host galaxy, and a narrow and well-defined ring, probably formed by accretion of material from a donor galaxy, collected by the host galaxy. Our observational study is based on BVRI broad-band imagery as well as long-slit spectroscopy in the wavelength range 4100-8600 Å, performed at the 1.6-m telescope at the Observatório do Pico dos Dias, Brazil. We have estimated a redshift of z = 0.01683, corresponding to a heliocentric radial velocity of 5045 ± 23 km s −1 . The (B − R) colour map shows that the ring is bluer than the host galaxy, which indicates that the ring is a younger structure. Standard diagnostic diagrams have been used to classify the main ionizing source of selected emission-line regions (nucleus, host galaxy and ring). We find that the ring regions are mainly ionized by massive stars, while the nucleus presents the characteristics of an active galactic nucleus. Using two empirical methods, we have found oxygen abundances for the H II regions located in the ring in the range 12+log(O/H) = 8.3-8.8 dex. We have also found the presence of an oxygen gradient across the ring, and it appears that AM 2020-504 follows the metallicity-luminosity relation of spiral galaxies. These results support the accretion scenario for this object and they rule out cold accretion as the source for the H I gas in the polar ring.

show abstract

“…In contrast to the situation regarding spiral galaxies, as shown by van Zee et al (1998) as well as by Denicoló, Terlevich & Terlevich (2002), very few PRGs have been studied to determine their metal abundances. A few examples are UGC 5600 (Shalyapina, Moiseev & Yakovleva 2002) where no gradient was found, NGC 7468 (Shalyapina et al 2004) with an inverted gradient where the outer parts are more metal‐rich than the inner parts, and AM1934‐563 (Brosch et al 2007) with a normal gradient for the galaxy but a constant metallicity for the ring.…”

Section: Discussionmentioning

confidence: 99%

On the nature of the apparent ring galaxy SDSS J075234.33+292049.8

Brosch

Kniazev

Моисеев

et al. 2010

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We show that an object classified as a galaxy in on‐line data bases and revealed on sky survey images as a distant ring galaxy is a rare case of polar ring galaxy (PRG) where the ring is only slightly inclined to the equatorial plane of the central body (CB). Imaging information from the Sloan Digital Sky Survey (SDSS) indicates that the diameter of the ring is about 36 kpc. The SDSS data was combined with long‐slit spectroscopic observations and with Fabry–Pérot interferometer Hβ mapping obtained at the Russian Academy of Sciences 6‐m telescope. We derived the complex morphologies of this presumed ring galaxy from a combination of SDSS images and from the kinematical behaviour of the CB and of the ring, and determined the stellar population compositions of the two components from the SDSS colours, from the spectroscopy and from models of evolutionary stellar synthesis. The metallicity of the ring material is slightly underabundant. The total luminosity and the total mass of the system are not extreme, but the rather high M/L ≃ 20 indicates the presence of large amounts of dark matter. We propose two alternative explanations of the appearance of this object. One is a ring formed by two semicircular and tight spiral arms at the end of a central bar. The apparent inclination between the ring and the CB, and a strange kink at the north‐east end of the ring, could be the result of a warp or of precession of the ring material. The object could, therefore, be explained as an extreme SBa(R) galaxy. The other possibility is that we observe a PRG where the inner object is an S0 and the ring is significantly more luminous than the central object. The compound object would then be similar to the NGC 4650A galaxy, but then it would be a rare object, with a polar component only modestly inclined to the equatorial plane of the CB. Arguments for (and against) both explanations are given and discussed, with the second alternative being more acceptable.

show abstract

A spectroscopic study of the peculiar galaxy UGC 5600

Cited by 6 publications

References 13 publications

Metallicity of the Polar Disk in NGC4650A: Constraints for Cold Accretion Scenario

Metallicity of the Polar Disk in NGC4650A: Constraints for Cold Accretion Scenario

Imagery and long-slit spectroscopy of the polar ring galaxy AM 2020-504

On the nature of the apparent ring galaxy SDSS J075234.33+292049.8

Contact Info

Product

Resources

About