Open AccessOn the X-Ray Emission of the Low-Mass Galaxy Groups
Author(s) -
H. M. Tovmassian,
O. Yam,
H. Tiersch
Publication year - 2002
Publication title -
the astrophysical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.376
H-Index - 489
eISSN - 1538-4357
pISSN - 0004-637X
DOI - 10.1086/339769
Subject(s) - physics , velocity dispersion , astrophysics , galaxy , galaxy group , x ray , astronomy , radial velocity , galaxy cluster , stars , optics
It is shown that the low-mass groups obey the $L_{x}\sim\sigma_v^{4}$ lawdeduced for galaxy clusters. The impression of the more shallow slope of the$L_x-\sigma_{v}$ correlation for groups is created not by enhanced X-rayemission, but by underestimation of the radial velocity dispersion of somegroups.Comment: 4 pages, 2 figures, accepted in ApJ
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom