Chandra Observations of M 31 and their Implications for its ISM 3
نویسندگان
چکیده
We have been regularly observing the bulge and inner disk of M31 for nearly 1 year, using both the HRC-I and ACIS-I instruments on the Chandra X-Ray Observatory. We present results from our program that are of interest to the study of the ISM in M31. In particular, we find that the unresolved emission within 3 of the center of M31 has a distinctly softer spectrum than that of most of the resolved x-ray sources in the region. Preliminary spectral analysis of bright point sources in the bulge shows no evidence (within the poor statistics) for soft spectral components, but does reveal significant extra-galactic x-ray extinction (NH ∼ 10 21 cm). We find no new x-ray counterparts to supernova remnants to date.
منابع مشابه
The Jet/ISM Interaction in Three Nearby Radio Galaxies as seen with Chandra
Chandra observations of radio galaxies have demonstrated a wide range of complex interactions between their jets and the ambient interstellar/intracluster medium (ISM/ICM). In this paper, we discuss results from Chandra observations of jet/ISM interactions in three nearby radio galaxies: Centaurus A (3.4 Mpc), M87 (16 Mpc), and NGC507 (66.7 Mpc). We present observational details for each object...
متن کاملDeployment of Interpretive Structural Modelling Methodology in Supply Chain Management –An overview
Abstract Purpose-The purpose of this paper is to review a sample of the literature relating to Interpretive Structural Modelling (ISM) and its deployment for modelling purposes in the area of supply chain management (SCM). Design/methodology/approach- The literature is examined from the three perspectives. First, concept of ISM and examines ISM as modelling technique. Second, use of ISM by ...
متن کاملChandra Observations of A2670 and A2107: A Comet Galaxy and cDs with Large Peculiar Velocities
We present an analysis of Chandra observations of the galaxy clusters A2670 and A2107. Their cD galaxies have large peculiar velocities (> 200 km s) and thus the clusters appear to be undergoing mergers. In A2670, we find a comet-like structure around one of the brightest galaxies. At the leading edge of the structure, there is a cold front. The mass of the X-ray gas in the comet-like structure...
متن کاملSPECTROPOLARIMETRY OF THE 3.4 m FEATURE IN THE DIFFUSE ISM TOWARD THE GALACTIC CENTER QUINTUPLET CLUSTER
Aliphatic hydrocarbons exhibit an absorption feature at 3.4 m, observed toward sources that sample diffuse regions of the interstellar medium (ISM). The absorbers responsible for this feature are assumed to reside in some component of interstellar dust, but the physical nature of the particles (size, shape, structure, etc.) is uncertain. Observations of interstellar polarization provide discrim...
متن کاملRegionalization of the Iowa State University Extension System: Lessons Learned by Key Administrators
The cyclical economic downturn in the United States has forced many Extension administrators to rethink and adjust services and programming. The Cooperative Extension System (CES), the organization primarily responsible for governmental Extension work in the United States, at Iowa State University responded to this economic downturn by restructuring its organization from county based to a regio...
متن کامل