MeerKAT

Research group

Research theme

Sub department

About

Related research groups

HI Intensity Mapping with the MIGHTEE Survey: First Results of the H i Power Spectrum

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2025)

Authors:

Aishrila Mazumder, Laura Wolz, Zhaoting Chen, Sourabh Paul, Mario G Santos, Matt Jarvis, Junaid Townsend, Srikrishna Sekhar, Russ Taylor

Abstract:

Abstract We present the first results of the H i intensity mapping power spectrum analysis with the MeerKAT International GigaHertz Tiered Extragalactic Exploration (MIGHTEE) survey. We use data covering ∼ 4 square degrees in the COSMOS field using a frequency range 962.5 MHz to 1008.42 MHz, equivalent to H i emission in 0.4 < z < 0.48. The data consists of 15 pointings with a total of 94.2 hours on-source. We verify the suitability of the MIGHTEE data for H i intensity mapping by testing for residual systematics across frequency, baselines and pointings. We also vary the window used for H i signal measurements and find no significant improvement using stringent Fourier mode cuts. We compute the H i power spectrum at scales 0.5 Mpc−1 ≲ k ≲ 10 Mpc−1 in auto-correlation as well as cross-correlation between observational scans using power spectrum domain averaging for pointings. We report consistent upper limits of 29.8  mK2Mpc3 from the 2σ cross-correlation measurements and 25.82 mK2Mpc3 from auto-correlation at k ∼2 Mpc−1.The low signal-to-noise in this data potentially limits our ability to identify residual systematics, which will be addressed in the future by incorporating more data in the analysis.
More details from the publisher

A Persistent Disk Wind and Variable Jet Outflow in the Neutron-star Low-mass X-Ray Binary GX 13+1

The Astrophysical Journal American Astronomical Society 986:1 (2025) 41

Authors:

Daniele Rogantini, Jeroen Homan, Richard M Plotkin, Maureen van den Berg, James Miller-Jones, Joey Neilsen, Deepto Chakrabarty, Rob P Fender, Norbert Schulz
More details from the publisher

A Multi-wavelength Characterization of the 2023 Outburst of MAXI J1807+132: Manifestations of Disk Instability and Jet Emission

(2025)

Authors:

Sandeep K Rout, M Cristina Baglio, Andrew Hughes, David M Russell, DM Bramich, Payaswini Saikia, Kevin Alabarta, Montserrat Armas Padilla, Sergio Campana, Stefano Covino, Paolo D'Avanzo, Rob Fender, Paolo Goldoni, Jeroen Homan, Fraser Lewis, Nicola Masetti, Sara Motta, Teo Munoz-Darias, Alessandro Papitto, Thomas D Russell, Gregory Sivakoff, Jakob van den Eijnden

A multi-dimensional view of a unified model for TDEs

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2025) staf880

Authors:

Edward J Parkinson, Christian Knigge, Lixin Dai, Lars Lund Thomsen, James H Matthews, Knox S Long
More details from the publisher

Gone with the Wind: JWST-MIRI Unveils a Strong Outflow from the Quiescent Stellar-Mass Black Hole A0620-00

(2025)

Authors:

Zihao Zuo, Gabriele Cugno, Joseph Michail, Elena Gallo, David M Russell, Richard M Plotkin, Fan Zou, M Cristina Baglio, Piergiorgio Casella, Fraser J Cowie, Rob Fender, Poshak Gandhi, Sera Markoff, Federico Vincentelli, Fraser Lewis, Jon M Miller, James CA Miller-Jones, Alexandra Veledina
More details from the publisher