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Detailed study of B037 based on HST images
Ma, Jun
AbstractB037 is of interest because it is both the most luminous and the most highly reddened cluster known in M31. Deep observations and high spatial resolution images with the Advanced Camera for Surveys on the Hubble Space Telescope (HST) first showed that this cluster is crossed by a dust lane. Photometric data in the F606W and F814W filters obtained in this paper indicate that colors of (F606W - F814W) in the dust lane are redder similar to 0.4 mag than ones in the other regions of B037. The HST images show that this dust lane seems to be contained in B037, instead of in the M31 disk or the Milky Way. As far as we know, the formation of dust requires gas with a rather high metallicity. However, B037 has a low metallicity of [Fe/H] = -1.07 +/- 0.20. So, it seems improbable that the observed dust lane is physically associated with B037. It is clear that the origin of this dust lane is worthy of future study. In addition, based on these images, we present the precise variation of ellipticity and position angle, and of surface brightness profile, and determine the structural parameters of B037 by fitting a single-mass isotropic King model. In the F606W filter, we derive the best-fitting scale radius r(0) = 0.56 +/- 0.02 '' (= 2.16 +/- 0.08 pc), a tidal radius r(t) = 8.6 +/- 0.4" (= 33.1 +/- 1.5 pc), and a concentration index c = log(r(t)/r(0)) = 1.19 +/- 0.02. In the F814W filter, we derive r(0) = 0.56 +/- 0.01 '' (= 2.16 +/- 0.04 pc), r(t) = 8.9 +/- 0.3 '' (= 34.3 +/- 1.2 pc), and c = log(r(t)/r(0)) = 1.20 +/- 0.01. The extinction-corrected central surface brightness is mu(0) = 13.53 +/- 0.03 mag arcsec(-2) in the F606W filter, and 12.85 +/- 0.03 mag arcsec(-2) in the F814W filter. We also calculate the half-light radius at r(h) = 1.05 +/- 0.03 '' (= 4.04 +/- 0.12 pc) in the F606W filter and r(h) = 1.07 +/- 0.01 '' (= 4.12 +/- 0.04 pc) in the F814W filter. In addition, we derived the complete magnitudes of B037 in the V and I bands by transforming the magnitudes from the ACS system to the standard system, which are in good agreement with previous ground-based broadband photometry studies.
KeywordGalaxies: Evolution Galaxies: Individual (M31) Globular Cluster: Individual (B037)
Indexed BySCI
WOS IDWOS:000290844200003
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
AffiliationChinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Ma, Jun. Detailed study of B037 based on HST images[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2011,11(5):524-536.
APA Ma, Jun.(2011).Detailed study of B037 based on HST images.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,11(5),524-536.
MLA Ma, Jun."Detailed study of B037 based on HST images".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 11.5(2011):524-536.
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