Open AccessThe X‐ray nebula around the type 2 Seyfert galaxy NGC 4388
Author(s) -
Iwasawa K.,
Wilson A. S.,
Fabian A. C.,
Young A. J.
Publication year - 2003
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2003.06857.x
Subject(s) - physics , astrophysics , nebula , galaxy , active galactic nucleus , ionization , emission spectrum , line (geometry) , observatory , astronomy , doubly ionized oxygen , x ray , spectral line , stars , ion , geometry , mathematics , quantum mechanics
We report on X‐ray emission from the type 2 Seyfert galaxy NGC 4388 observed with the Chandra X‐ray Observatory. A hard X‐ray peak is found at the position of the active nucleus suggested by optical and radio observations. Extended soft X‐ray emission correlates well with the ionization cone found in optical‐line emission. A large soft X‐ray extension is found up to 16 kpc (and possibly 30 kpc) to the north of the galaxy. Photoionized gas with low ionization parameters (log ξ≤ 0.4) appears to be the likely explanation for this emission. The same ionized gas clouds could be responsible for the optical [O iii ] emission. Fe Kα line emission from cold material is found to be extended by a few kpc.