Spectroscopic and photometric study of starburst galaxies

Optical and near infrared properties of a blue compact dwarf galaxy mrk 49 in the virgo cluster

Eon Chang Sung, Jaemann Kyeong, Yong-Ik Byun

Research output: Contribution to journalArticle

Abstract

We present optical and near-infrared imaging and long-slit spectroscopy for the blue compact dwarf galaxy (BCD) Mrk 49 in the Virgo Cluster. The surface brightness distribution analysis shows that Mrk 49 consists of an off-centered blue bright compact core of r=10′′ and a red faint outer exponential envelope. The Hα image and color difference suggest that these two components have different stellar populations: a high surface brightness population of massive young stars and an underlying low surface brightness population of older stars. The redder near-infrared colors of the inner most region suggest that the near-infrared flux of Mrk 49 originates from evolved massive stars associated with the current star-forming activity. The total apparent magnitude is BT=14.32 mag and the mean effective surface brightness is μeff (B)=21.56 mag arcsec-2. Long-slit spectroscopy shows that Mrk 49 rotates apparently as a solid body within r = 10′′ in a plane at position angle 55 degrees with an amplitude of about 20 km sec-1. The measured radial velocity of Mrk 49 was derived as 1,535 km sec-1; and the total mass of stars and gases is in the range of 3 to 6 × 109 M. The mass-to-light ratios for the central region of Mrk 49 in I and B band are estimated 1.0 and 0.5, respectively. The upper limit of the dark matter to visible matter ratio seems to be < 5. The oxygen abundance is 12+log(O/H)=8.21 ± 0.1 which is about one quarter of the solar value while the relative helium abundance appears to be similar to that of the sun.

Original languageEnglish
Pages (from-to)121-137
Number of pages17
JournalJournal of the Korean Astronomical Society
Volume41
Issue number5
DOIs
Publication statusPublished - 2008 Dec 1

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compact galaxies
starburst galaxies
dwarf galaxies
near infrared
stars
brightness
slits
spectroscopy
color
brightness distribution
mass to light ratios
massive stars
radial velocity
helium
dark matter
sun
envelopes
oxygen
gases
gas

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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title = "Spectroscopic and photometric study of starburst galaxies: Optical and near infrared properties of a blue compact dwarf galaxy mrk 49 in the virgo cluster",
abstract = "We present optical and near-infrared imaging and long-slit spectroscopy for the blue compact dwarf galaxy (BCD) Mrk 49 in the Virgo Cluster. The surface brightness distribution analysis shows that Mrk 49 consists of an off-centered blue bright compact core of r=10′′ and a red faint outer exponential envelope. The Hα image and color difference suggest that these two components have different stellar populations: a high surface brightness population of massive young stars and an underlying low surface brightness population of older stars. The redder near-infrared colors of the inner most region suggest that the near-infrared flux of Mrk 49 originates from evolved massive stars associated with the current star-forming activity. The total apparent magnitude is BT=14.32 mag and the mean effective surface brightness is μeff (B)=21.56 mag arcsec-2. Long-slit spectroscopy shows that Mrk 49 rotates apparently as a solid body within r = 10′′ in a plane at position angle 55 degrees with an amplitude of about 20 km sec-1. The measured radial velocity of Mrk 49 was derived as 1,535 km sec-1; and the total mass of stars and gases is in the range of 3 to 6 × 109 M⊙. The mass-to-light ratios for the central region of Mrk 49 in I and B band are estimated 1.0 and 0.5, respectively. The upper limit of the dark matter to visible matter ratio seems to be < 5. The oxygen abundance is 12+log(O/H)=8.21 ± 0.1 which is about one quarter of the solar value while the relative helium abundance appears to be similar to that of the sun.",
author = "Sung, {Eon Chang} and Jaemann Kyeong and Yong-Ik Byun",
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T1 - Spectroscopic and photometric study of starburst galaxies

T2 - Optical and near infrared properties of a blue compact dwarf galaxy mrk 49 in the virgo cluster

AU - Sung, Eon Chang

AU - Kyeong, Jaemann

AU - Byun, Yong-Ik

PY - 2008/12/1

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N2 - We present optical and near-infrared imaging and long-slit spectroscopy for the blue compact dwarf galaxy (BCD) Mrk 49 in the Virgo Cluster. The surface brightness distribution analysis shows that Mrk 49 consists of an off-centered blue bright compact core of r=10′′ and a red faint outer exponential envelope. The Hα image and color difference suggest that these two components have different stellar populations: a high surface brightness population of massive young stars and an underlying low surface brightness population of older stars. The redder near-infrared colors of the inner most region suggest that the near-infrared flux of Mrk 49 originates from evolved massive stars associated with the current star-forming activity. The total apparent magnitude is BT=14.32 mag and the mean effective surface brightness is μeff (B)=21.56 mag arcsec-2. Long-slit spectroscopy shows that Mrk 49 rotates apparently as a solid body within r = 10′′ in a plane at position angle 55 degrees with an amplitude of about 20 km sec-1. The measured radial velocity of Mrk 49 was derived as 1,535 km sec-1; and the total mass of stars and gases is in the range of 3 to 6 × 109 M⊙. The mass-to-light ratios for the central region of Mrk 49 in I and B band are estimated 1.0 and 0.5, respectively. The upper limit of the dark matter to visible matter ratio seems to be < 5. The oxygen abundance is 12+log(O/H)=8.21 ± 0.1 which is about one quarter of the solar value while the relative helium abundance appears to be similar to that of the sun.

AB - We present optical and near-infrared imaging and long-slit spectroscopy for the blue compact dwarf galaxy (BCD) Mrk 49 in the Virgo Cluster. The surface brightness distribution analysis shows that Mrk 49 consists of an off-centered blue bright compact core of r=10′′ and a red faint outer exponential envelope. The Hα image and color difference suggest that these two components have different stellar populations: a high surface brightness population of massive young stars and an underlying low surface brightness population of older stars. The redder near-infrared colors of the inner most region suggest that the near-infrared flux of Mrk 49 originates from evolved massive stars associated with the current star-forming activity. The total apparent magnitude is BT=14.32 mag and the mean effective surface brightness is μeff (B)=21.56 mag arcsec-2. Long-slit spectroscopy shows that Mrk 49 rotates apparently as a solid body within r = 10′′ in a plane at position angle 55 degrees with an amplitude of about 20 km sec-1. The measured radial velocity of Mrk 49 was derived as 1,535 km sec-1; and the total mass of stars and gases is in the range of 3 to 6 × 109 M⊙. The mass-to-light ratios for the central region of Mrk 49 in I and B band are estimated 1.0 and 0.5, respectively. The upper limit of the dark matter to visible matter ratio seems to be < 5. The oxygen abundance is 12+log(O/H)=8.21 ± 0.1 which is about one quarter of the solar value while the relative helium abundance appears to be similar to that of the sun.

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