Hubble space telescope photometry of globular clusters in M81

Julie B. Nantais, John P. Huchra, Andreas Zezas, Kosmas Gazeas, Jay Strader

Resultado de la investigación: Article

9 Citas (Scopus)

Resumen

We perform aperture photometry and profile fitting on 419 globular cluster (GC) candidates with mV ≤ 23mag identified in Hubble Space Telescope/Advanced Camera for Surveys BVI imaging, and estimate the effective radii of the clusters. We identify 85 previously known spectroscopically confirmed clusters, and newly identify 136 objects as good cluster candidates within the 3σ color and size ranges defined by the spectroscopically confirmed clusters, yielding a total of 221 probable GCs. The luminosity function peak for the 221 probable GCs with estimated total dereddening applied is V ∼(20.26 ± 0.13)mag, corresponding to a distance of ∼3.7 ± 0.3Mpc. The blue and red GC candidates, and the metal-rich and metal-poor spectroscopically confirmed clusters, respectively, are similar in half-light radius. Red confirmed clusters are about 6% larger in median half-light radius than blue confirmed clusters, and red and blue good GC candidates are nearly identical in half-light radius. The total population of confirmed and "good" candidates shows an increase in half-light radius as a function of galactocentric distance.

Idioma originalEnglish
Número de artículo183
PublicaciónAstronomical Journal
Volumen142
N.º6
DOI
EstadoPublished - dic 2011

Huella dactilar

globular clusters
Hubble Space Telescope
photometry
radii
metal
range size
metals
apertures
cameras
luminosity
color
estimates
profiles

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Citar esto

Nantais, Julie B. ; Huchra, John P. ; Zezas, Andreas ; Gazeas, Kosmas ; Strader, Jay. / Hubble space telescope photometry of globular clusters in M81. En: Astronomical Journal. 2011 ; Vol. 142, N.º 6.
@article{fd93ae39d83b40a8977b8e002e733d90,
title = "Hubble space telescope photometry of globular clusters in M81",
abstract = "We perform aperture photometry and profile fitting on 419 globular cluster (GC) candidates with mV ≤ 23mag identified in Hubble Space Telescope/Advanced Camera for Surveys BVI imaging, and estimate the effective radii of the clusters. We identify 85 previously known spectroscopically confirmed clusters, and newly identify 136 objects as good cluster candidates within the 3σ color and size ranges defined by the spectroscopically confirmed clusters, yielding a total of 221 probable GCs. The luminosity function peak for the 221 probable GCs with estimated total dereddening applied is V ∼(20.26 ± 0.13)mag, corresponding to a distance of ∼3.7 ± 0.3Mpc. The blue and red GC candidates, and the metal-rich and metal-poor spectroscopically confirmed clusters, respectively, are similar in half-light radius. Red confirmed clusters are about 6{\%} larger in median half-light radius than blue confirmed clusters, and red and blue good GC candidates are nearly identical in half-light radius. The total population of confirmed and {"}good{"} candidates shows an increase in half-light radius as a function of galactocentric distance.",
keywords = "galaxies: individual (M81), galaxies: spiral, galaxies: star clusters: general, galaxies: stellar content",
author = "Nantais, {Julie B.} and Huchra, {John P.} and Andreas Zezas and Kosmas Gazeas and Jay Strader",
year = "2011",
month = "12",
doi = "10.1088/0004-6256/142/6/183",
language = "English",
volume = "142",
journal = "Astronomical Journal",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "6",

}

Hubble space telescope photometry of globular clusters in M81. / Nantais, Julie B.; Huchra, John P.; Zezas, Andreas; Gazeas, Kosmas; Strader, Jay.

En: Astronomical Journal, Vol. 142, N.º 6, 183, 12.2011.

Resultado de la investigación: Article

TY - JOUR

T1 - Hubble space telescope photometry of globular clusters in M81

AU - Nantais, Julie B.

AU - Huchra, John P.

AU - Zezas, Andreas

AU - Gazeas, Kosmas

AU - Strader, Jay

PY - 2011/12

Y1 - 2011/12

N2 - We perform aperture photometry and profile fitting on 419 globular cluster (GC) candidates with mV ≤ 23mag identified in Hubble Space Telescope/Advanced Camera for Surveys BVI imaging, and estimate the effective radii of the clusters. We identify 85 previously known spectroscopically confirmed clusters, and newly identify 136 objects as good cluster candidates within the 3σ color and size ranges defined by the spectroscopically confirmed clusters, yielding a total of 221 probable GCs. The luminosity function peak for the 221 probable GCs with estimated total dereddening applied is V ∼(20.26 ± 0.13)mag, corresponding to a distance of ∼3.7 ± 0.3Mpc. The blue and red GC candidates, and the metal-rich and metal-poor spectroscopically confirmed clusters, respectively, are similar in half-light radius. Red confirmed clusters are about 6% larger in median half-light radius than blue confirmed clusters, and red and blue good GC candidates are nearly identical in half-light radius. The total population of confirmed and "good" candidates shows an increase in half-light radius as a function of galactocentric distance.

AB - We perform aperture photometry and profile fitting on 419 globular cluster (GC) candidates with mV ≤ 23mag identified in Hubble Space Telescope/Advanced Camera for Surveys BVI imaging, and estimate the effective radii of the clusters. We identify 85 previously known spectroscopically confirmed clusters, and newly identify 136 objects as good cluster candidates within the 3σ color and size ranges defined by the spectroscopically confirmed clusters, yielding a total of 221 probable GCs. The luminosity function peak for the 221 probable GCs with estimated total dereddening applied is V ∼(20.26 ± 0.13)mag, corresponding to a distance of ∼3.7 ± 0.3Mpc. The blue and red GC candidates, and the metal-rich and metal-poor spectroscopically confirmed clusters, respectively, are similar in half-light radius. Red confirmed clusters are about 6% larger in median half-light radius than blue confirmed clusters, and red and blue good GC candidates are nearly identical in half-light radius. The total population of confirmed and "good" candidates shows an increase in half-light radius as a function of galactocentric distance.

KW - galaxies: individual (M81)

KW - galaxies: spiral

KW - galaxies: star clusters: general

KW - galaxies: stellar content

UR - http://www.scopus.com/inward/record.url?scp=81255178343&partnerID=8YFLogxK

U2 - 10.1088/0004-6256/142/6/183

DO - 10.1088/0004-6256/142/6/183

M3 - Article

AN - SCOPUS:81255178343

VL - 142

JO - Astronomical Journal

JF - Astronomical Journal

SN - 0004-6256

IS - 6

M1 - 183

ER -