Open Access

Table 1.

Vega magnitudes of the optical and IR counterparts of four ULXs.

Counterparts
Filters(date) X-1 X-14 X-18 X-24
JWST/NIRCam

F277W(2023-06-30) Out 21.45  ±  0.03 Non 20.73  ±  0.02
F150W(2023-06-30) Out 20.83  ±  0.02 Non Out
F090W(2023-06-30) Out 22.08  ±  0.03 Non Out
F090W(2023-09-14) Out 22.05  ±  0.03 Non Out
F150W(2023-09-14) Out 20.80  ±  0.01 Non Out
F277W(2023-09-14) Out 21.44  ±  0.03 Non 20.51  ±  0.02
F300M(2023-09-14) Out 20.39  ±  0.04 Non 19.61  ±  0.02
F335M(2023-09-14) Out 20.24  ±  0.05 Non 18.52  ±  0.01

HST/UVIS1
F336W(2015-10-30) 24.34  ±  0.08 22.53  ±  0.04 24.43  ±  0.09 24.07  ±  0.07
F438W(2015-10-30) 25.63  ±  0.06 22.64  ±  0.02 25.93  ±  0.12 24.97  ±  0.05
F606W(2015-10-30) 24.52  ±  0.03 Out Out Out
F814W(2017-09-12) Out 22.12  ±  0.02 25.35  ±  0.13 23.42  ±  0.02
F555W(2017-09-15) Out 22.51  ±  0.01 25.26  ±  0.05 24.34  ±  0.03
F814W(2017-09-26) Out 22.11  ±  0.02 25.41  ±  0.12 23.39  ±  0.03
F555W(2017-10-02) Out 22.55  ±  0.02 25.27  ±  0.06 24.37  ±  0.03
F814W(2017-11-07) Out 22.20  ±  0.02 25.34  ±  0.12 23.43  ±  0.04
F275W(2019-04-06) 24.25  ±  0.05 22.09  ±  0.03 24.18  ±  0.06 24.43  ±  0.08

Notes. “Out” indicates that the sources are outside the field of view, while “Non” indicates that there is no counterpart.

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