Segue 2, discovered by an extension of the Sloan Digital Sky Survey in 2009, is putting out about as much light as 900 suns, Bullock said. In this video, we will talk about the smallest discovered galaxy in the universe. Without this acting as galactic glue, the star body wouldn’t qualify as a galaxy.”. Segue 2: The Least Massive Galaxy. [6] The metallicity of these old stars is also very low at [Fe/H] ≈ −2.5 ± 0.8, which means that they contain 300 times less heavy elements than the Sun. Segue 2, discovered by Belokurov et al. The upper limit with 90% (95%) confidence is sigma_v < 2.2 (2.6) km/s, the most stringent limit for any galaxy. Measurements have so far failed to detect neutral hydrogen in it—the upper limit is 13 solar masses. The velocity dispersion is too small to be measured with our data. Segue 2 is the least massive galaxy known. … Whereas SEGUE-1 matched shorter exposures of bright targets with long exposures of faint targets, SEGUE-2 obtains only deep pointings, as it focuses on the far reaches of our Galaxy. Hello and welcome to What Da Math! It may once have been a globular cluster of the Sagittarius Dwarf Elliptical Galaxy, which was later stripped from it by the tidal forces acting from the Milky Way galaxy. [6], The stellar population of Segue 1 consists mainly of old stars formed more than 12 billion years ago. (2009), is a galaxy with a luminosity of only 900 L_sun. [2][4] This elongation may be caused by the tidal forces acting from the Milky Way galaxy if Segue 1 is being tidally disrupted now.[6]. What sets Segue 2 apart from a star cluster is the dark matter halo that acts as the galaxy's glue, another study researcher, Evan Kirby, explained in a statement. It was discovered in 2009 as part of the massive Sloan Digital Sky Survey. Bibliographic information: Evan N. Kirby et al. The galaxy is located at the distance of about 35 kpcs (35,000 parsecs (110,000 ly)) from the Sun and moves towards the Sun with a speed of 40 km/s. (2009), is a galaxy with a luminosity of only 900 L_sun. Segue 3 is extremely faint—its visible absolute magnitude is estimated at −1.2 or even at about 0.0 ± 0.8, which means that the cluster is only 100 to 250 times brighter than the Sun. 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That’s miniscule compared to the Milky Way, which shines 20 billion times brighter. We identify Segue 2 as a galaxy rather than a star cluster based the wide dispersion in [Fe/H] (from -2.85 to -1.33) among the member stars. The galaxy Segue 2: boxes are ten member stars identified so far by University of California Irvine astronomers and their colleagues ( / Centre de Données astronomiques de Strasbourg / SIMBAD). 2009, MNRAS, 397, 1748 ΔRA Δ D e c ΔRA Δ D e c g – r g – r r r SDSS III/SEGUE CFHT/Megacam The upper limit with 90% (95%) confidence is sigma_v < 2.2 (2.6) km/s, the most stringent limit for any galaxy. We present Keck/DEIMOS spectroscopy of 25 members of Segue 2--a threefold increase in spectroscopic sample size. According to the findings of a study published online in the Astrophysical Journal, a dwarf galaxy named Segue 2 is the least massive galaxy in the known Universe.

segue 2 galaxy diameter

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