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OBSID:
23466
 Title:
Timing the M82 X-2 pulsar with Chandra and NuSTAR      
Investigator:
Bachetti
 Observer:
Bachetti, Matteo
 Phone:
3287128468
 Email:
matteo.bachetti@inaf.it
Target Name:
M82 X-2
 Sequence Number:
402244
 Instrument:
HRC-I
 Grating:
NONE
 SI Mode:
HIO_002B
 Raster Scan:
N
 Annotated DOT:
MAY2421a

Proposal Number:
22400529
 Right Ascension:
148.963
 Declination:
69.6793
 Status:
archived
 Start Date:
2021-05-30 16:12:09
Category:
BH AND NS BINARIES
 Type:
GO
 AO Cycle:
22
 Dither Flag:
Y
 Y Offset:

 Z Offset:
Est. Count Rate:
0.1
 Order-1 Count Rate:

 Exposure Time:
5.00
 Time Remaining:

 Reqd Start Time:

 Reqd Stop Time:
Period:

 Epoch:

 Start of Period:

 End of Period:

 PS Margin:

 PE Margin:

 Max Segments:
0

Trigger Level:
DEF
 Range Switch Lvl:
DEF
 Spect Mode:
DEF
 Antico Enab:
DEF
 Width Enab:
DEF
 Width Thold:
DEF
 Uld Enab:
DEF
 Upper Lvl Disc:
DEF
Blank Enab:
EDGE
 U Blank Hi:
119
 V Blank Hi:
119
 U Blank Lo:
69
 V Blank Lo:
69
 Py Shutter Pos:
DEF
 My Shutter Pos:
DEF
 Timing Mode:
N

Abstract:
The galaxy M82 harbors two notable ultraluminous X-ray sources (ULX): M82 X-2, the archetipal pulsating ultraluminous X-ray source (PULX), and M82 X-1, a IMBH candidate. The extreme luminosity of ULXs, and the observation of strong winds from these sources, suggests that these sources are undergoing strongly super-Eddington accretion. The supply of matter that powers these accreting systems is likely to come from Roche Lobe overflow from a more massive companion star, and should produce changes of orbital period observable in time scales of ~years. We have recently detected such orbital period derivative thanks to NuSTAR. This program aims at following up on this orbital period derivative through pulsar timing in M82 X-2, using Chandra to select the ideal observing times.

OBSID 23466 not found in Q/L Processing Logs dated Sun Mar 30 22:53:58 EST 2025

pgf@space.mit.edu Sat Mar 29 10:37:19 EST 2025