MMTF-Halpha AND HST-FUV IMAGING OF THE FILAMENTARY COMPLEX IN ABELL 1795

Journal Article · Thu Oct 01 00:00:00 EDT 2009 · Astrophysical Journal (Online)

DOI:https://doi.org/10.1088/0004-637X/703/2/L172· OSTI ID:21371854

McDonald, Michael ^[1]; Veilleux, Sylvain ^[2]

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1. Department of Astronomy, University of Maryland, College Park, MD 20742 (United States)
2. Also at Max-Planck-Institut fuer extraterrestrische Physik, Postfach 1312, D-85741 Garching (Germany)

We have obtained deep, high spatial resolution images of the central region of Abell 1795 at Halpha and [N II] lambda6583 with the Maryland-Magellan Tunable Filter (MMTF), and in the far-ultraviolet (FUV) with the Advanced Camera for Surveys solar blind channel on the Hubble Space Telescope (HST). The superb image quality of the MMTF data has made it possible to resolve the known SE filament into a pair of thin, intertwined filaments extending for {approx}50 kpc, with a width <1 kpc. The presence of these thin, tangled strands is suggestive of a cooling wake where runaway cooling is taking place, perhaps aided by an enhanced magnetic field in this region. The HST data further resolve these strands into chains of FUV-bright stellar clusters, indicating that these filaments are indeed sites of ongoing star formation, but at a rate {approx}2 orders of magnitude smaller than the mass-deposition rates predicted from the X-ray data. The elevated [N II]/Halpha ratio and large spatial variations of the FUV/Halpha flux ratio across the filaments indicate that O-star photoionization is not solely responsible for the ionization. The data favor collisional heating by cosmic rays either produced in situ by magnetohydrodynamical processes or conducted from the surrounding intracluster medium.

• OSTI ID: 21371854
• Journal Information: Astrophysical Journal (Online), Vol. 703, Issue 2; Other Information: DOI: 10.1088/0004-637X/703/2/L172; ISSN 1538-4357
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
CAMERAS
COLLISIONAL HEATING
COSMIC RADIATION
FAR ULTRAVIOLET RADIATION
GALAXIES
GALAXY CLUSTERS
IMAGES
MAGNETIC FIELDS
PHOTOIONIZATION
SPATIAL RESOLUTION
STARS
TELESCOPES
ELECTROMAGNETIC RADIATION
HEATING
HIGH-FREQUENCY HEATING
IONIZATION
IONIZING RADIATIONS
MAGNETIC-PUMPING HEATING
PLASMA HEATING
RADIATIONS
RESOLUTION
ULTRAVIOLET RADIATION