HS 0822+3542 - A new nearby extremely metal-poor galaxy

A. Y. Kniazcv; S. A. Pustilnik; J. Masegosa; I. Márquez; A. V. Ugryumov; J. M. Martin; Y. I. Izotov; D. Engels; N. Brosch; U. Hopp; S. Merlino; V. A. Lipovetsky

HS 0822+3542 - A new nearby extremely metal-poor galaxy

A. Y. Kniazcv^*, S. A. Pustilnik, J. Masegosa, I. Márquez, A. V. Ugryumov, J. M. Martin, Y. I. Izotov, D. Engels, N. Brosch, U. Hopp, S. Merlino, V. A. Lipovetsky

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

We present the results of spectrophotometry and BV R CCD photometry, as well as integrated HI radio measurements of a new blue compact galaxy (BCG) HS 0822+3542 with extremely low oxygen abundance: 12+log(O/H) = 7.35, or 1/36 of solar value. The galaxy is the third most metal-deficient BCG after I Zw 18 and SBS 0335-052. Its very high mass fraction of gas (≈ 95% of all visible mass) and blue colours of underlying nebulosity are also similar to those of SBS 0335-052. This suggests that HS 0822+3542 is one of the nearest and dimmest galaxies experiencing a recently-started first star formation (SF) episode. Its properties imply that for such galaxies there is a linear scaling of the main parameters, at least for the baryon mass range (0.3-20)×10⁸ M_⊙. The total mass estimate indicates that the galaxy is dynamically dominated by a dark matter (DM) halo, which itself is one of the least massive for galaxies.

Original language	English
Pages (from-to)	101-110
Number of pages	10
Journal	Astronomy and Astrophysics
Volume	357
Issue number	1
State	Published - 2000

Keywords

Galaxies: abundances
Galaxies: fundamental parameters
Galaxies: individual: Hs 0822+3542
Galaxies: photometry
Galaxies: star-burst

Cite this

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title = "HS 0822+3542 - A new nearby extremely metal-poor galaxy",

abstract = "We present the results of spectrophotometry and BV R CCD photometry, as well as integrated HI radio measurements of a new blue compact galaxy (BCG) HS 0822+3542 with extremely low oxygen abundance: 12+log(O/H) = 7.35, or 1/36 of solar value. The galaxy is the third most metal-deficient BCG after I Zw 18 and SBS 0335-052. Its very high mass fraction of gas (≈ 95% of all visible mass) and blue colours of underlying nebulosity are also similar to those of SBS 0335-052. This suggests that HS 0822+3542 is one of the nearest and dimmest galaxies experiencing a recently-started first star formation (SF) episode. Its properties imply that for such galaxies there is a linear scaling of the main parameters, at least for the baryon mass range (0.3-20)×108 M⊙. The total mass estimate indicates that the galaxy is dynamically dominated by a dark matter (DM) halo, which itself is one of the least massive for galaxies.",

keywords = "Galaxies: abundances, Galaxies: fundamental parameters, Galaxies: individual: Hs 0822+3542, Galaxies: photometry, Galaxies: star-burst",

author = "Kniazcv, {A. Y.} and Pustilnik, {S. A.} and J. Masegosa and I. M{\'a}rquez and Ugryumov, {A. V.} and Martin, {J. M.} and Izotov, {Y. I.} and D. Engels and N. Brosch and U. Hopp and S. Merlino and Lipovetsky, {V. A.}",

year = "2000",

language = "אנגלית",

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TY - JOUR

T1 - HS 0822+3542 - A new nearby extremely metal-poor galaxy

AU - Kniazcv, A. Y.

AU - Pustilnik, S. A.

AU - Masegosa, J.

AU - Márquez, I.

AU - Ugryumov, A. V.

AU - Martin, J. M.

AU - Izotov, Y. I.

AU - Engels, D.

AU - Brosch, N.

AU - Hopp, U.

AU - Merlino, S.

AU - Lipovetsky, V. A.

PY - 2000

Y1 - 2000

N2 - We present the results of spectrophotometry and BV R CCD photometry, as well as integrated HI radio measurements of a new blue compact galaxy (BCG) HS 0822+3542 with extremely low oxygen abundance: 12+log(O/H) = 7.35, or 1/36 of solar value. The galaxy is the third most metal-deficient BCG after I Zw 18 and SBS 0335-052. Its very high mass fraction of gas (≈ 95% of all visible mass) and blue colours of underlying nebulosity are also similar to those of SBS 0335-052. This suggests that HS 0822+3542 is one of the nearest and dimmest galaxies experiencing a recently-started first star formation (SF) episode. Its properties imply that for such galaxies there is a linear scaling of the main parameters, at least for the baryon mass range (0.3-20)×108 M⊙. The total mass estimate indicates that the galaxy is dynamically dominated by a dark matter (DM) halo, which itself is one of the least massive for galaxies.

AB - We present the results of spectrophotometry and BV R CCD photometry, as well as integrated HI radio measurements of a new blue compact galaxy (BCG) HS 0822+3542 with extremely low oxygen abundance: 12+log(O/H) = 7.35, or 1/36 of solar value. The galaxy is the third most metal-deficient BCG after I Zw 18 and SBS 0335-052. Its very high mass fraction of gas (≈ 95% of all visible mass) and blue colours of underlying nebulosity are also similar to those of SBS 0335-052. This suggests that HS 0822+3542 is one of the nearest and dimmest galaxies experiencing a recently-started first star formation (SF) episode. Its properties imply that for such galaxies there is a linear scaling of the main parameters, at least for the baryon mass range (0.3-20)×108 M⊙. The total mass estimate indicates that the galaxy is dynamically dominated by a dark matter (DM) halo, which itself is one of the least massive for galaxies.

KW - Galaxies: abundances

KW - Galaxies: fundamental parameters

KW - Galaxies: individual: Hs 0822+3542

KW - Galaxies: photometry

KW - Galaxies: star-burst

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JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

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HS 0822+3542 - A new nearby extremely metal-poor galaxy

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