NICER observation list: Target ID 263401
- Proposal Number = 2634
- Target ID = 263401
- Target Name = Cen_X-4
- Proposal Title = REVEALING THE RELATION BETWEEN HARD AND SOFT QUIESCENT X-RAY SPECTRA IN CEN X-4
- PI = MICHAEL NOWAK
- Proposal Category = X-RAY PULSARS AND NEUTRON STARS
- Cycle number = 2
- Observation Type = NOR
Abstract
We propose a campaign of joint NuSTAR and NICER observations of the quiescent neutron star Cen X-4, to study the relationship between its soft X-ray flux level and its hard X-ray spectrum. The hard X-ray spectrum has been hypothesized to be due to thermal bremsstrahlung from active accretion onto the neutron star, and may transit to synchrotron emission at low flux. If the bremsstrahlung/active accretion hypothesis is correct, we should be able to measure spectral changes with our proposed campaign.
| Obsid |
RA |
DEC |
l |
b |
Start |
End |
Exposure |
Number of modules |
Status of Processing |
Date of Processing |
Public date |
| 2634010101 |
224.589 |
-31.667 |
332.24151 |
23.88390 |
58690.7815 |
58690.9250 |
2783.00000 |
52 |
VALIDATED |
58695.9 |
59064 |
| 2634010102 |
224.591 |
-31.669 |
332.24230 |
23.88163 |
58691.1042 |
58691.5579 |
4339.00000 |
52 |
VALIDATED |
58695.9 |
59065 |
| 2634010201 |
224.591 |
-31.669 |
332.24234 |
23.88119 |
58735.1011 |
58735.8414 |
7464.00000 |
52 |
VALIDATED |
58739.6 |
59109 |
| 2634010301 |
224.594 |
-31.669 |
332.24400 |
23.88025 |
58855.2585 |
58855.8683 |
194.00000 |
50 |
VALIDATED |
58859.8 |
59229 |
| 2634010302 |
224.592 |
-31.668 |
332.24346 |
23.88124 |
58856.0308 |
58856.4488 |
328.00000 |
50 |
VALIDATED |
58860.8 |
59230 |
| 2634010401 |
224.591 |
-31.669 |
332.24242 |
23.88114 |
58886.1150 |
58886.9775 |
17985.00000 |
52 |
VALIDATED |
58898.0 |
59260 |
| 2634010402 |
224.592 |
-31.669 |
332.24227 |
23.88074 |
58887.0197 |
58887.0421 |
1626.00000 |
52 |
VALIDATED |
58898.1 |
59261 |
| 2634010501 |
224.590 |
-31.669 |
332.24169 |
23.88202 |
58904.7736 |
58904.9831 |
3619.00000 |
52 |
VALIDATED |
58910.9 |
59278 |
| 2634010502 |
224.591 |
-31.669 |
332.24214 |
23.88172 |
58905.0964 |
58905.6928 |
11919.00000 |
52 |
VALIDATED |
58912.0 |
59279 |
| 2634010601 |
224.588 |
-31.666 |
332.24068 |
23.88496 |
59050.7378 |
59050.8907 |
2614.00000 |
52 |
VALIDATED |
59054.7 |
59424 |
| 2634010602 |
224.589 |
-31.667 |
332.24197 |
23.88377 |
59050.9962 |
59051.9206 |
10073.00000 |
52 |
VALIDATED |
59055.6 |
59425 |
| 2634010603 |
224.593 |
-31.669 |
332.24345 |
23.88056 |
59291.7765 |
59291.9768 |
1767.00000 |
52 |
VALIDATED |
59296.0 |
59665 |
| 2634010604 |
224.593 |
-31.669 |
332.24370 |
23.88078 |
59292.0346 |
59292.4553 |
3475.00000 |
52 |
VALIDATED |
59296.6 |
59666 |
| 2634010605 |
224.591 |
-31.669 |
332.24247 |
23.88123 |
59304.5582 |
59304.9725 |
2587.00000 |
52 |
VALIDATED |
59314.8 |
59678 |
| 2634010606 |
224.591 |
-31.669 |
332.24243 |
23.88116 |
59305.0308 |
59305.7898 |
4844.00000 |
52 |
VALIDATED |
59314.8 |
59679 |
| 2634010701 |
224.595 |
-31.669 |
332.24501 |
23.87963 |
59220.4280 |
59220.8321 |
0.00000 |
49 |
VALIDATED |
59243.9 |
59594 |
| 2634010702 |
224.593 |
-31.669 |
332.24380 |
23.88043 |
59221.0088 |
59221.7374 |
916.00000 |
49 |
VALIDATED |
59244.0 |
59595 |