منابع مشابه
PAH emission variations within the resolved starbursts of NGC 253 and NGC 1808 ⋆
In order to better characterise the usefulness of PAH emission as a tracer of star formation, we have undertaken a programme of 3 µm narrowband imaging of a sample of nearby template galaxies covering a wide range of metallicity, star formation activity, and nuclear activity. In the present paper we present first results of this programme: high spatial resolution images of PAH feature emission ...
متن کاملThe Stellar Populations of NGC 3109: Another Dwarf Irregular Galaxy with a Population II Stellar Halo
We have obtained V and I-band photometry for about 17500 stars in the field of the dwarf irregular galaxy NGC 3109, located in the outskirts of the Local Group. The photometry allows us to study the stellar populations present inside and outside the disk of this galaxy. From the VI color-magnitude diagram we infer metallicities and ages for the stellar populations in the main body and in the ha...
متن کاملConstraints on Cold Dark Matter in the Gamma - ray Halo of NGC 253
A gamma-ray halo in a nearby starburst galaxy NGC 253 was found by the CANGAROO-II Imaging Atmospheric Cherenkov Telescope (IACT). By fitting the energy spectrum with expected curves from Cold Dark Matter (CDM) annihilations, we constrain the CDM-annihilation rate in the halo of NGC 253. Upper limits for the CDM density were obtained in the wide mass range between 0.5 and 50 TeV. Although these...
متن کاملThe Nuclear Starburst in Ngc 253
We have obtained long-slit spectra of NGC 253 in the J, H, K, and N bands, broadband images in the J, H, and K s bands, narrowband images centered at the wavelengths of Brγ and H 2 (1,0)S(1), and imaging spectroscopy centered on [Ne II](12.8µm). We have subtracted a composite stellar spectrum from the galaxy spectrum to measure faint emission lines which otherwise would be buried in the complic...
متن کاملThe Collimated Wind in Ngc 253
Received ; accepted – 2 – ABSTRACT Near-infrared Fabry-Perot imaging has revealed H 2 emission extended to about 130 pc from the disk of NGC 253. It is closely related to the hot plasma observed in soft X-rays: filamentary H 2 features are found at the edges of the hot plasma. These are the places of direct interaction between a superwind and its surrounding molecular gas. We suggest that the f...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2011
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/736/1/24