The globular cluster system of M60 (NGC 4649). I. Canada-France-Hawaii telescope MOS spectroscopy and database

Myung Gyoon Lee, H. O.Seong Hwang, Hong Soo Park, Jang Hyun Park, Sang Chul Kim, Young-Jong Sohn, Sang Gak Lee, Soo Chang Rey, Young-Wook Lee, Ho Il Kim

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Abstract

We present radial velocity measurements for globular clusters in M60, a giant elliptical galaxy in the Virgo Cluster. Target globular cluster candidates were selected using Washington photometry based on deep 16′ × 16′ images taken at the KPNO 4 m telescope and using VI photometry derived from Hubble Space Telescope WFPC2 archival images. The spectra of the target objects were obtained with the Multi-Object Spectrograph at the Canada-France-Hawaii Telescope. We have measured the radial velocities of 111 objects in the field of M60: 93 globular clusters (72 blue globular clusters with 1.0 ≤ C - T 1 < 1.7, and 21 red globular clusters with 1.7 ≤ C - T 1 < 2.4), 11 foreground stars, six small galaxies, and the nucleus of M60. The measured velocities of the 93 globular clusters range from ∼500 to ∼ 1600 km s -1 , with a mean value of 1070 -25 +27 km s -1 , which is in good agreement with the velocity of the nucleus of M60 (v gal = 1056 km s -1 ). Combining our results with data from the literature, we present a master catalog of radial velocities for 121 globular clusters in M60. The velocity dispersion of the clusters in the master catalog is found to be 234 -14 +13 km s -1 for the entire sample, 223 -16 +13 km s -1 for 83 blue globular clusters, and 258 -31 +21 km s -1 for 38 red globular clusters.

Original languageEnglish
Pages (from-to)857-868
Number of pages12
JournalAstrophysical Journal
Volume674
Issue number2
DOIs
Publication statusPublished - 2008 Feb 20

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globular clusters
France
Canada
spectroscopy
telescopes
radial velocity
catalogs
photometry
nuclei
elliptical galaxies
velocity measurement
Hubble Space Telescope
spectrographs
galaxies
stars

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Lee, Myung Gyoon ; Hwang, H. O.Seong ; Park, Hong Soo ; Park, Jang Hyun ; Kim, Sang Chul ; Sohn, Young-Jong ; Lee, Sang Gak ; Rey, Soo Chang ; Lee, Young-Wook ; Kim, Ho Il. / The globular cluster system of M60 (NGC 4649). I. Canada-France-Hawaii telescope MOS spectroscopy and database. In: Astrophysical Journal. 2008 ; Vol. 674, No. 2. pp. 857-868.
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abstract = "We present radial velocity measurements for globular clusters in M60, a giant elliptical galaxy in the Virgo Cluster. Target globular cluster candidates were selected using Washington photometry based on deep 16′ × 16′ images taken at the KPNO 4 m telescope and using VI photometry derived from Hubble Space Telescope WFPC2 archival images. The spectra of the target objects were obtained with the Multi-Object Spectrograph at the Canada-France-Hawaii Telescope. We have measured the radial velocities of 111 objects in the field of M60: 93 globular clusters (72 blue globular clusters with 1.0 ≤ C - T 1 < 1.7, and 21 red globular clusters with 1.7 ≤ C - T 1 < 2.4), 11 foreground stars, six small galaxies, and the nucleus of M60. The measured velocities of the 93 globular clusters range from ∼500 to ∼ 1600 km s -1 , with a mean value of 1070 -25 +27 km s -1 , which is in good agreement with the velocity of the nucleus of M60 (v gal = 1056 km s -1 ). Combining our results with data from the literature, we present a master catalog of radial velocities for 121 globular clusters in M60. The velocity dispersion of the clusters in the master catalog is found to be 234 -14 +13 km s -1 for the entire sample, 223 -16 +13 km s -1 for 83 blue globular clusters, and 258 -31 +21 km s -1 for 38 red globular clusters.",
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The globular cluster system of M60 (NGC 4649). I. Canada-France-Hawaii telescope MOS spectroscopy and database. / Lee, Myung Gyoon; Hwang, H. O.Seong; Park, Hong Soo; Park, Jang Hyun; Kim, Sang Chul; Sohn, Young-Jong; Lee, Sang Gak; Rey, Soo Chang; Lee, Young-Wook; Kim, Ho Il.

In: Astrophysical Journal, Vol. 674, No. 2, 20.02.2008, p. 857-868.

Research output: Contribution to journalArticle

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T1 - The globular cluster system of M60 (NGC 4649). I. Canada-France-Hawaii telescope MOS spectroscopy and database

AU - Lee, Myung Gyoon

AU - Hwang, H. O.Seong

AU - Park, Hong Soo

AU - Park, Jang Hyun

AU - Kim, Sang Chul

AU - Sohn, Young-Jong

AU - Lee, Sang Gak

AU - Rey, Soo Chang

AU - Lee, Young-Wook

AU - Kim, Ho Il

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N2 - We present radial velocity measurements for globular clusters in M60, a giant elliptical galaxy in the Virgo Cluster. Target globular cluster candidates were selected using Washington photometry based on deep 16′ × 16′ images taken at the KPNO 4 m telescope and using VI photometry derived from Hubble Space Telescope WFPC2 archival images. The spectra of the target objects were obtained with the Multi-Object Spectrograph at the Canada-France-Hawaii Telescope. We have measured the radial velocities of 111 objects in the field of M60: 93 globular clusters (72 blue globular clusters with 1.0 ≤ C - T 1 < 1.7, and 21 red globular clusters with 1.7 ≤ C - T 1 < 2.4), 11 foreground stars, six small galaxies, and the nucleus of M60. The measured velocities of the 93 globular clusters range from ∼500 to ∼ 1600 km s -1 , with a mean value of 1070 -25 +27 km s -1 , which is in good agreement with the velocity of the nucleus of M60 (v gal = 1056 km s -1 ). Combining our results with data from the literature, we present a master catalog of radial velocities for 121 globular clusters in M60. The velocity dispersion of the clusters in the master catalog is found to be 234 -14 +13 km s -1 for the entire sample, 223 -16 +13 km s -1 for 83 blue globular clusters, and 258 -31 +21 km s -1 for 38 red globular clusters.

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