A dataset provided by the European Space Agency

Name 030232
Title Building Blocks of Large Scale Structure: A Study of a Major Merger of Two Group
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0302320201

DOI 10.5270/esa-4ydu7kj
Author Dr Ralph Kraft
Description We propose a 30 ks XMM-Newton observation of the merging groups NGC 7618 and UGC 12491. Group-group mergers play an key role in the formation of structure in the Universe, but have been poorly studied relative to galaxy clusters because of their lower X-ray luminosity. These two groups are nearby (74 Mpc), X-ray bright, and separated by only 280 kpc on the sky. Our goal is to map the thermodynamic parameters of the gas across the merger to constrain the dynamics of the merger. A short Chandra observation of NGC 7618 revealed a sharp surface brightness discontinuity probably related to motion of the group core due to the merger. The NGC 7618-UGC 12491 pair is an ideal example to study the hydrodynamics of the early stage of a merger between two galaxy groups.
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The Spitzer Mid-infrared Active Galactic Nucleus Survey. I. Optic...
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2006-01-20T20:22:37Z/2006-01-21T07:00:05Z
Version 17.56_20190403_1200
Mission Description The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations.
Since Earth's atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
Creator Contact https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published 2007-02-09T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2007-02-09T00:00:00Z, 030232, 17.56_20190403_1200. https://doi.org/10.5270/esa-4ydu7kj