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ID 34747
file
creator
Yagi, Masafumi
Komiyama, Yutaka
Furusawa, Hisanori
Kashikawa, Nobunari
Hattori, Takashi
Okamura, Sadanori
subject
galaxies: clusters
individual (Coma)
galaxies: clusters: intracluster medium
galaxies: evolution
galaxies: kinematics and dynamics ,; intergalactic medium
NDC
Astronomy. Space sciences
abstract
We present the results of deep imaging and spectroscopic observations of very extended ionized gas (EIG) around four member galaxies of the Coma Cluster of galaxies: RB 199, IC 4040, GMP 2923, and GMP 3071. The EIGs were serendipitously found in an H alpha narrowband imaging survey of the central region of the Coma Cluster. The relative radial velocities of the EIGs with respect to the systemic velocities of the parent galaxies from which they emanate increase almost monotonically with the distance from the nucleus of the respective galaxies, reaching similar to-400 to - 800 km s(-1) at around 40-80 kpc from the galaxies. The one-sided morphologies and the velocity fields of the EIGs are consistent with the predictions of numerical simulations of ram pressure stripping. We found a very low velocity filament (nu(rel) similar to -1300 km s(-1)) at the southeastern edge of the disk of IC 4040. Some bright compact knots in the EIGs of RB 199 and IC 4040 exhibit blue continuum and strong H alpha emission. The equivalent widths of the H alpha emission exceed 200 angstrom and are greater than 1000 angstrom for some knots. The emission-line intensity ratios of the knots are basically consistent with those of sub-solar abundance H II regions. These facts indicate that intensive star formation occurs in the knots. Some filaments, including the low-velocity filament of the IC 4040 EIG, exhibit shock-like emission-line spectra, suggesting that shock heating plays an important role in ionization and excitation of the EIGs.
journal title
Astrophysical Journal
volume
Volume 749
issue
Issue 1
start page
43
date of issued
2012
publisher
IOP Publishing Ltd
issn
0004-637X
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
(c) 2012. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
relation url
department
Hiroshima Astrophysical Science Center