scholarly journals Subaru Deep Spectroscopy of the Very Extended Emission-Line Region of NGC 4388: Ram Pressure Stripped Gas Ionized by Nuclear Radiation

2004 ◽  
Vol 127 (1) ◽  
pp. 90-104 ◽  
Author(s):  
Michitoshi Yoshida ◽  
Youichi Ohyama ◽  
Masanori Iye ◽  
Kentaro Aoki ◽  
Nobunari Kashikawa ◽  
...  
Keyword(s):  
Emission Line ◽  
Nuclear Radiation ◽  
Line Region ◽  
Ram Pressure ◽  
Extended Emission

scholarly journals Area Spectroscopy of the Extended Emission Line Region in the Seyfert Galaxy NGC 3516

1995 ◽  
Vol 149 ◽  
pp. 203-204
Author(s):  
K. Aoki ◽  
H. Ohtani ◽  
G. Kosugi ◽  
M. Yoshida
Keyword(s):  
Emission Line ◽  
Radiation Field ◽  
Seyfert Galaxy ◽  
Hii Regions ◽  
Nuclear Radiation ◽  
Ngc 4151 ◽  
Dust Clouds ◽  
Line Region ◽  
Extended Emission

The researches into extended emission line region (EELR) give us the valuable informations about the nucleus. A recent study of the EELR in the Seyfert 1 galaxy NGC 4151 by Yoshida and Ohtani (1993) have revealed that a strongly asymmetric radiation field in this typical Seyfert 1. They have suggested the anisotropy may be caused inside the BLR. It is important to examine if any other Seyfert 1 galaxy has an anisotropic nuclear radiation.The famous Seyfert 1 galaxy NGC 3516 has EELR which extends ∼ 10” on either side of the nucleus. The morphology of the EELR is Z-shape. This nearby (D=38.9Mpc) galaxy is of type SBO for which the object is expected to be free from contamination by HII regions and dust clouds.

scholarly journals Deep Spectroscopy of the Very Extended Ionized Gas of NGC 4388

2004 ◽  
Vol 217 ◽  
pp. 386-388
Author(s):  
Michitoshi Yoshida ◽  
M. Yagi ◽  
S. Okamura ◽  
Y. Ohyama ◽  
N. Kashikawa ◽  
...  
Keyword(s):  
Emission Line ◽  
Virgo Cluster ◽  
Ionized Gas ◽  
Shock Heating ◽  
Line Region ◽  
Systemic Velocity ◽  
Ram Pressure ◽  
The Galaxy ◽  
Solar Abundances ◽  
Extended Emission

We report here the results of deep optical spectroscopy of the very extended emission-line region (VEELR) found serendipitously around the Seyfert 2 galaxy NGC 4388 in the Virgo cluster. The Hα recession velocities of most of the filaments of the region observed are highly blue-shifted with respect to the systemic velocity of the galaxy. The velocity field is complicated, and there seem to be several streams of filaments ranging from ~ −100 km s−1 to ~ −700 km s−1 with respect to the systemic velocity of the galaxy. The emission-line ratios of the VEELR filaments are well explained by power-law photoionization models with solar abundances. In addition to photoionization, shock heating probably contributes to the ionization of the gas. We conclude that the VEELR was formerly the disk gas of NGC 4388, which has been stripped by ram pressure due to the interaction between the hot intra-cluster medium (ICM) and the galaxy.

High Velocity Outflow in the Extended Emission-Line Region of the Seyfert Galaxy NGC 7319

1996 ◽  
Vol 111 ◽  
pp. 140 ◽  
Author(s):  
Kentaro Aoki ◽  
Hiroshi Ohtani ◽  
Michitosh Yoshida ◽  
George Kosugi
Keyword(s):  
Emission Line ◽  
High Velocity ◽  
Seyfert Galaxy ◽  
Line Region ◽  
Extended Emission

scholarly journals The extended emission-line region of the Seyfert galaxy Mrk 573

1999 ◽  
Vol 309 (1) ◽  
pp. 1-25 ◽  
Author(s):  
P. Ferruit ◽  
A. S. Wilson ◽  
H. Falcke ◽  
C. Simpson ◽  
E. Pecontal ◽  
...  
Keyword(s):  
Emission Line ◽  
Seyfert Galaxy ◽  
Line Region ◽  
Extended Emission

scholarly journals The Extended Emission‐Line Region of 4C 37.43

2002 ◽  
Vol 572 (2) ◽  
pp. 735-745 ◽  
Author(s):  
Alan Stockton ◽  
John W. MacKenty ◽  
Esther M. Hu ◽  
Tae‐Sun Kim
Keyword(s):  
Emission Line ◽  
Line Region ◽  
Extended Emission

An Extended Emission Line Region around Mrk 1172

2019 ◽  
Vol 15 (S359) ◽  
pp. 438-440
Author(s):  
Augusto Lassen ◽  
Rogério Riffel ◽  
Ana L. Chies-Santos ◽  
Evelyn Johnston ◽  
Boris Haeussler ◽  
...  
Keyword(s):  
Emission Line ◽  
Stellar Population ◽  
Emission Lines ◽  
Gas Content ◽  
Early Type ◽  
Strong Emission ◽  
Line Region ◽  
Hard Radiation ◽  
Star Formation Activity ◽  
Extended Emission

AbstractWe serendipitously found an intriguing Extended Emission Line Region (EELR) near the quiescent and massive early-type Mrk 1172, with a projected extension of approximately 14 × 14 kpc. Its irregular shape, high gas content, strong emission lines and proximity to an isolated possible faded quasar raise questions about the ionization of this gas and the nature of this object. Analyzing the stellar population in both objects we observe that the EELR has a dominance of young-intermediate and intermediate stellar populations (200 Myr < t < 1 Gyr) with significant star formation activity, while Mrk 1172 is dominated by old stellar population (t > 5 Gyr). BPT diagnostic diagrams indicate that the gas in the EELR is photoionized by hot massive stars rather than by a hard radiation field or by shocks. Further analysis on abundances of the gas and its kinematics shall be performed to better comprehend the nature of this object and how it is interacting with Mrk 1172.

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