Stephan ’ s Quintet : A Multi - galaxy Collision
نویسنده
چکیده
Stephan’s Quintet (SQ), discovered more than 100 years ago, is the most famous and well studied compact galaxy group. It has been observed in almost all wavebands, with the most advanced instruments including Spitzer, GALEX, HST, Chandra, VLA, and various large mm/submm telescopes/arrays such as the IRAM 30m and BIMA. The rich multi-band data reveal one of the most fascinating pictures in the universe, depicting a very complex web of interactions between member galaxies and various constituents of the intragroup medium (IGM), which in turn trigger some spectacular activities such as a 40 kpc large scale shock and a strong IGM starburst. In this talk I will give a review on these observations.
منابع مشابه
Stephan’s Quintet: The X-ray Anatomy of a Multiple Galaxy Collision
Chandra observations of the compact galaxy group known as Stephan’s Quintet (SQ) are presented. The major morphological features that were discovered with the ROSAT HRI are now imaged with higher resolution and S/N. The large scale shock (1.′5, ∼40kpc if at 85 Mpc) is resolved into a narrow NS feature embedded in more extended diffuse emission (D≥ 3′). The NS structure is somewhat clumpy, more ...
متن کاملStephan ’ s Quintet with XMM - Newton
The prototype compact group known as Stephan's Quintet (SQ) was observed with XMM-Newton in order to complement the excellent resolution of Chandra with high sensitivity to extended emission. SQ is a dynamic environment whose main effect, at both X-ray and optical wavelengths, appears to be ISM stripping. This is manifested by: 1) secular evolution of morphological types towards earlier types a...
متن کاملStarburst in the Intragroup Medium of Stephan’s Quintet
Based on new ISO mid-infrared observations and ground based Hα and near-infrared observations, we report the detection of a bright starburst in the intragroup medium (IGM) of the famous compact group of galaxies Stephan’s Quintet (Source A in Fig.1). We demonstrate that this starburst is caused by a collision between a high velocity (δV∼ 1000 km/sec) intruder galaxy (NGC7318b) and the IGM of th...
متن کاملPowerful High Velocity-dispersion Molecular Hydrogen associated with an Intergalactic Shock Wave in Stephan’s Quintet
We present the discovery of strong mid-infrared emission lines of molecular hydrogen of apparently high velocity dispersion (∼870 km s) originating from a group-wide shock wave in Stephans Quintet. These Spitzer Space Telescope observations reveal emission lines of molecular hydrogen and little else. This is the first time an almost pure H2 line spectrum has been seen in an extragalactic object...
متن کاملar X iv : a st ro - p h / 03 06 26 1 v 1 1 2 Ju n 20 03 Physical Conditions and Star Formation Activity in the Intragroup Medium of
New multi-band observations of the famous compact group of galaxies Stephan's Quintet (SQ) are presented and analyzed. These include far infrared (FIR) images at 60µm and 100µm (ISOPHOT C-100 camera), radio continuum images at 1.4 GHz (VLA B-array) and 4.86 GHz (VLA C-array), and long-slit optical spectrographs (Palomar 200 " telescope). With these new data, we aim to learn more about the X-ray...
متن کامل