Abstract
Abstract
The recently discovered non-magnetic cataclysmic variable TUVO-21acq was serendipitously observed in a quiescent state during an XMM-Newton observing campaign for the starburst galaxy NGC 4945. Data from this campaign was combined with archival serendipitous XMM observations to examine its X-ray and UV/optical characteristics. TUVO-21acq was found to have X-ray flux F
X(0.4–3.0 keV) ∼ 1.3 × 10−14 erg s−1 cm−2 and features similar to other quiescent dwarf novae, with X-ray luminosity L
X(0.4–3.0 keV) ∼ 8 × 1030 erg s−1 and a white dwarf mass
M
WD
=
0.78
−
0.27
+
0.37
M
⊙
. Its UV/optical spectrum was variable between observations, possibly due to changes in the accretion disk or the visibility of the bright spot.