Star formation in outer rings of S0 galaxies

Сильченко, О. К.; Моисеев, А. В.

doi:10.1051/0004-6361/202038158

Cited by 4 publications

(1 citation statement)

References 33 publications

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“…The bluer bar in the central region is associated with a radially asymmetric star-forming ring with an average (g−r) color = 0.45 mag (Figure 4). Very few similar star-forming rings in S0 galaxies have been reported recently (Proshina et al 2019;Sil'chenko & Moiseev 2020). What is more intriguing is the presence of two bluer optical clumps on the ring.…”

Section: Central Star Formation and The Blue Barmentioning

confidence: 65%

Central Star Formation in Early-type Galaxy I Zw 81 in the Bootes Void

Pandey

Saha

Pradhan

et al. 2022

ApJ

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The origin of star formation in customarily passively evolving early-type massive galaxies is poorly understood. We present a case study of a massive galaxy, I Zw 81, inside the Bootes void. The void galaxy is known to host active galactic nuclei (AGN). Our detailed 2D decomposition of the surface brightness distribution in the Canada France Hawaii Telescope (CFHT) g and r bands revealed multiple structural components such as a nuclear point source, a bar, a ring, and an inner exponential disk followed by an outer low surface brightness disk. I Zw 81 turns out to be a disk-dominated galaxy with lenticular morphology. The modeling of the multiwavelength spectral energy distribution shows that the galaxy is star-forming (SF), and belongs to the blue cloud. We find that the optical (g−r) color of the bar is bluer than the disks, and the far- and near-ultraviolet emission inside the galaxy observed with Imaging Telescope onboard AstroSat is concentrated in the central few kpc region enclosing the bar. The strong bar might be playing a pivotal role in driving the gas inflow and causing SF activity in tandem with the minor merger-like interactions as evident from the deep CFHT data. The low-luminosity AGN is insufficient to quench the central SF. The results are peculiar from the standpoint of a massive barred lenticular galaxy.

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Section: Central Star Formation and The Blue Barmentioning

confidence: 65%

Central Star Formation in Early-type Galaxy I Zw 81 in the Bootes Void

Pandey

Saha

Pradhan

et al. 2022

ApJ

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Star formation in outer rings of S0 galaxies

Сильченко

Моисеев

Oparin

et al. 2023

A&A

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Aims. Though S0 galaxies are usually thought to be 'red and dead', they often demonstrate weak star formation organised in ring structures and located in their outer disks. We try to clarify the nature of this phenomenon and its difference from star formation in spiral galaxies. The nearby moderate-luminosity S0 galaxy UGC 4599 is studied here. Methods. By applying long-slit spectroscopy at the Russian 6m telescope, we have measured stellar kinematics for the main body of the galaxy and strong emission-line flux ratios in the ring. After inspecting the gas excitation in the ring using line ratio diagrams, and having shown that it is ionised by young stars, we determined the gas oxygen abundance by using conventional strong-line calibration methods. We inspected the gas kinematics in the ring with Fabry-Perot interferometer data obtained at the William Herschel Telescope. The pattern and properties of the brightest star formation regions were studied with the tunable filter MaNGaL at the 2.5m telescope of the Caucasian Mountain Observatory of the SAI MSU.Results. The gas metallicity in the ring is certainly subsolar, [O/H]= −0.4 ± 0.1 dex, which is different from the majority of the outer star-forming rings in S0s we have studied in the past, which typically have nearly solar metallicity. The total stellar component of the galaxy, which is old in the centre, is less massive than its extended gaseous disk. We conclude that the ring and the outer disk of UGC 4599 are probably a result of gas accretion from a cosmological filament.

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The haloes and environments of nearby galaxies (HERON) – III. A 45-kpc spiral structure in the GLSB galaxy UGC 4599

Mosenkov,

Rich,

Fusco

et al. 2023

Monthly Notices of the Royal Astronomical Society

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We use a 0.7-m telescope in the framework of the Halos and Environments of Nearby Galaxies (HERON) survey to probe low surface brightness (LSB) structures in nearby galaxies. One of our targets, UGC 4599, is usually classified as an early-type galaxy surrounded by a blue ring making it a potential Hoag’s Object analogue. Prior photometric studies of UGC 4599 were focused on its bright core and the blue ring. However, the HERON survey allows us to study its faint extended regions. With an 8-h integration, we detect an extremely faint outer disc with an extrapolated central surface brightness of μ0, d(r) = 25.5 mag arcsec−2 down to 31 mag arcsec−2 and a scale length of 15 kpc. We identify two distinct spiral arms of pitch angle ∼6○ surrounding the ring. The spiral arms are detected out to ∼45 kpc in radius and the faint disc continues to ∼70 kpc. These features are also seen in the GALEX far- and near-ultraviolet bands, in a deep u-band image from the 4.3-m Lowell Discovery Telescope (which reveals inner spiral structure emerging from the core), and in H i. We compare this galaxy to ordinary spiral and elliptical galaxies, giant low surface brightness (GLSB) galaxies, and Hoag’s Object itself using several standard galaxy scaling relations. We conclude that the pseudo-bulge and disc properties of UGC 4599 significantly differ from those of Hoag’s Object and of normal galaxies, pointing toward a GLSB galaxy nature and filamentary accretion of gas to generate its outer disc.

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Star formation in outer rings of S0 galaxies

Cited by 4 publications

References 33 publications

Central Star Formation in Early-type Galaxy I Zw 81 in the Bootes Void

Central Star Formation in Early-type Galaxy I Zw 81 in the Bootes Void

Star formation in outer rings of S0 galaxies

The haloes and environments of nearby galaxies (HERON) – III. A 45-kpc spiral structure in the GLSB galaxy UGC 4599

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