A multiwavelength study of the Galactic center black hole candidate MAXI J1744-294
Abstrak
For the first time in nearly a decade, a bright transient was detected in the central parsec (pc) of the Galaxy. MAXI J1744-294, or -- as it was known in its previous life -- Swift J174540.2-290037, was discovered in outburst by the MAXI telescope in January 2025. We present the results of a broadband, multi-wavelength study of MAXI J1744-294, including data from the NuSTAR, Chandra, XMM-Newton, Swift, and NICER X-ray telescopes, as well as complementary radio and near-infrared observations. We analyze the changing X-ray emission as the outburst evolved from the high/soft to the low/hard state. Using relativistic reflection features in the data, we estimate a spin of $a>0.92$ and viewing inclination $\theta=28^{+3}_{-4}$ deg, consistent with the parameters measured for Swift J174540.2-290037. Based on the spectral and temporal characteristics of MAXI J1744-294, we reaffirm its classification as a candidate black hole (BH) low-mass X-ray binary (LMXB) -- the third candidate BH transient discovered within 20 arcsec of the Galactic supermassive black hole Sgr~A*. This work provides further evidence for a cusp of BH-LMXBs in the central pc of our Galaxy, as argued for in previous observational studies and suggested by analytical and theoretical work. Our ongoing multi-wavelength study, involving a complementary range of observatories and spanning different outburst states, can serve as a model for future time domain astrophysics research.
Topik & Kata Kunci
Penulis (75)
S. Mandel
K. Mori
P. Draghis
Mark T. Reynolds
C. Jin
M. Parra
B. Levin
Eric Miao
N. Grollimund
A. Ciurlo
Sean Granados
G. K. Jaisawal
L. Marra
M. Bachetti
F. Capitanio
N. Degenaar
C. Hailey
Jaesub Hong
S. Motta
G. Ponti
M. Shara
M. Shidatsu
J. Tomsick
Randall D. Campbell
S. Corbel
R. Fender
A. Ghez
J. Grindlay
Daryl Haggard
M. Hosek
Ziqian Hua
Ole Konig
Kai Matsunaga
R. Mikuvsincov'a
M. Nynka
G. Sanger-Johnson
G. Stel
A. Tarana
R. Wijnands
Shuo Zhang Columbia Astrophysics Laboratory
M. I. F. Astrophysics
Space Research
D. O. Astronomy
O. University
National Astronomical Observatories
Chinese Academy of Sciences
D. Physics
E. University
Universit'e de Paris Cit'e
Universit'e Paris-Saclay
Ucla Department of Physics
Astronomy
Dtu Space
T. Denmark
I. D. A. E. P. Spaziali
I. D. Cagliari
A. S. M. F. Astronomy
U. Amsterdam
Center for Astrophysics Harvard Smithsonian
Inaf Brera
D. O. Astrophysics
A. History
Space Sciences Laboratory
U. California
Berkeley
W. Observatory
Astrophysics
U. Oxford
M. University
School of Physics Astronomy
S. Science
N. University
Graduate School of Science
Kyoto University
M. University
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