ASTRONOMY AND ASTROPHYSICS 10 μ m imaging and HI observations of the Blue Compact Dwarf galaxy He 2 - 10 ?
نویسندگان
چکیده
We have observed the Blue Compact Dwarf (BCD) galaxyHe 2-10 in the∼10 μmmid-infrared (MIR) atmospheric window using broad-band filters centered at λ10.1μm and λ11.65μm. In both filters, only the galaxy’s central regions were detected. One of the UV emitting regions is not detected, implying an older age. The central region contains two resolved components which have the same MIR properties but different Hα fluxes. We interpret these properties in terms of differing star forming histories. Based on its morphology, we show that the MIR emission is unambiguously associated with the young massive stars. We study the spatial variations of the MIR color and conclude that they imply the existence of a hot grain contribution to the 11.65 μm flux in the central regions of the starburst. We also present a new single-dish measurement of the Hi content of He 2–10.
منابع مشابه
The ACS Virgo Cluster Survey V: SBF Calibration for Giant and Dwarf Early-type Galaxies
As part of the Advanced Camera for Survey (ACS) Virgo Cluster Survey, we have measured Surface Brightness Fluctuations (SBF) in a sample of 100 earlytype Virgo galaxies. Distances derived from these measurements are needed to explore the three-dimensional structure of the Virgo Cluster, study the intrinsic parameters of globular clusters associated with the program galaxies, and compare with th...
متن کاملWfpc2 Observations of the Carina Dwarf Spheroidal Galaxy
We present our analysis of Hubble Space Telescope Wide Field Planetary Camera 2 observations in F555W (∼V ) and F814W (∼I) of the Carina dwarf spheroidal galaxy. The resulting V vs V−I color-magnitude diagrams reach V ≈27.1 mag. The reddening of Carina is estimated to be E(V−I) = 0.08±0.02 mag. A new estimate of the distance modulus of Carina, (m − M)0 = 19.87±0.11 mag, has been derived primari...
متن کامل2 7 Ju l 2 00 9 The Galaxy Population of Low - Redshift Abell Clusters
We present a study of the luminosity and color properties of galaxies selected from a sample of 57 low-redshift Abell clusters. We utilize the non-parametric dwarf-to-giant ratio (DGR) and the blue galaxy fraction (fb) to investigate the clustercentric radial-dependent changes in the cluster galaxy population. Composite cluster samples are combined by scaling the counting radius by r200 to mini...
متن کاملDiscovery of a Metal-Line Absorber Associated with a Local Dwarf Starburst Galaxy
We present optical and near-infrared images, H I 21 cm emission maps, optical spectroscopy, and Hubble Space Telescope/Space Telescope Imaging Spectrograph ultraviolet spectroscopy of the QSO/galaxy pair SBS 1122+594/IC 691. The QSO sight line lies at a position angle of 27 from the minor axis of the nearby dwarf starburst galaxy IC 691 (czgal = 1204± 3 km s, LB ∼ 0.09 L, current star formation...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1997