Fossil groups of galaxies: Are they groups? Are they fossils?
نویسندگان
چکیده
منابع مشابه
On the Nature of Fossil Galaxy Groups: Are They Really Fossils
We use SDSS-DR4 photometric and spectroscopic data out to redshift z ∼ 0.1 combined with ROSAT All Sky Survey X-ray data to produce a sample of twenty-five fossil groups (FGs), defined as bound systems dominated by a single, luminous elliptical galaxy with extended X-ray emission. We examine possible biases introduced by varying the parameters used to define the sample and the main pitfalls are...
متن کاملLeukemia Support Groups: How Are They Doing?
BACKGROUND: Support groups help their participants to cope with the emotional and practical impact of their illnesses. METHODS: The effectiveness of the Leukemia Society of America support groups in enhancing the quality of life for their participants is reviewed. The groundwork, purpose, and structure of such groups, as well as alternate sources of support, are presented. Evaluation and future...
متن کاملStellar Populations in the Central Galaxies of Fossil Groups
It is inferred from the symmetrical and luminous X-ray emission of fossil groups that they are mature, relaxed galaxy systems. Cosmological simulations and observations focusing on their dark halo and inter-galactic medium properties confirm their early formation. Recent photometric observations suggest that, unlike the majority of non-fossil brightest group galaxies (BGGs), the central early-t...
متن کاملHerbal drug leaflets: are they in compliance with standards?
Leaflets inside pharmaceutical packages should include focal points about medicines being used by patients. The current study was designed to assess the compliance of information cited in herbal medicine leaflets with the standards released by the Ministry of Health and Medical Education of Iran (MHMEI). Leaflets of commonly used herbal pharmaceutical products sold in pharmacies of Iran were co...
متن کامل(Non)native Language Teachers’ Cognitions: Are They Dichotomous?
In view of native/nonnative language teacher dichotomy, different characteristics have been assigned to these 2 groups. The dichotomy has been the source of different actions and measures to clarify the positive and negative points of being (non)native teachers. In recent years, many researchers have revisited this dichotomy. The challenge to the dichotomy can be a source of motivation to explo...
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: Proceedings of the International Astronomical Union
سال: 2009
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921310009300