Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...507l..99x&link_type=abstract
The Astrophysical Journal, Volume 507, Issue 1, pp. L99-L99.
Astronomy and Astrophysics
Astrophysics
3
Scientific paper
In the Letter ``An X-Ray Luminous, Dwarf Seyfert Companion of Markarian 273'' by X.-Y. Xia, Th. Boller, H. Wu, Z.-G. Deng, Y. Gao, Z.-L. Zou, S. Mao, and G. Börner (ApJ, 496, L9 [1998]), an observational error occurred that invalidates some of our conclusions. Since Mrk 273x was essentially invisible (B~21) in our acqusition image, in order to position the slit on the faint Mrk 273x, a slit rotation had to be applied. Unfortunately, the amount of rotation was applied incorrectly. As a result, the spectrum obtained (shown in Fig. 2) was not for the intended target, Mrk 273x, but for an object very close to, but northeast of, Mrk 273. A new spectrum of Mrk 273x indicates that Mrk 273x is at redshift 0.458, not at 0.0378 as quoted in the Letter. The larger redshift implies that both the optical and X-ray luminosity have to be revised upward by a factor of ~170. Mrk 273x is therefore not a dwarf galaxy optically. The X-ray properties of Mrk 273x remain the same except that its soft X-ray luminosity now reaches ~10^44 ergs s^-1 for H_0=50 km s^-1 Mpc^-1. The new observations will be presented in a subsequent paper (X.-Y. Xia et al., in preparation [1998]) in order to make corrections and shed further insights on the objects in the Mrk 273 field.
Boller Th.
Börner Gerhard
Deng Zu-Gang
Gao Yanfang
Mao Shijun
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