Black hole X-ray binaries sometimes show powerful outflows along the accretion disk, which is called the disk winds. They often appear in X-ray spectra as blueshifted, highly ionized absorption lines. Previous observations suggest that the mass loss rate due to disk winds is comparable to the mass accretion rate onto black holes, and therefore the disk winds are thought to have a significant...
Winds from accretion discs around compact objects, both in X-ray binaries and Active Galactic Nuclei, have been extensively studied in the past two decades with X-ray spectroscopy. However, to date, the launching mechanism of these winds remains a highly controversial topic. A distinct advantage of studying these winds in high inclination, dipping, neutron star X-ray binaries is that highly...
The first year and a half of XRISM science has led to a select number of observations of Black Hole Low Mass X-ray Binaries (BHLMXB), most of which in very unusual states. We will briefly present the context of all these observations, and notably results for :
-A faint soft state exposure of the Black Hole candidate 4U 1630-47 taken at the end of its 2022-2024 outburst. Despite the closest to...
In March 2024 Cygnus X-3 (Cyg X-3) was in a quenched/hypersoft state (soft/high). During this state a 67 ksec XRISM observations was triggered along with ToO observations with the SMA. During this period there were also supporting observations being made with AMI (radio), NuSTAR (hard X-ray), and Fermi (gamma-ray). The SMA submillimeter observation taken during the XRISM observation revealed...
Low mass X-ray binaries (LMXBs) are systems composed of a compact object (black hole or neutron star) and a low mass (< mSun) companion star. The compact object accretes matter from the companion, forming an accretion disk. The gas in the disk is ionized by the strong X-ray emission from the inner disk region, leading to the appearance of photoionized plasmas. Characterizing their properties...
We report new constraints on the distance to 4U 1630−47 by analyzing its dust scattering halo (DSH) using high-resolution X-ray (Chandra) and millimeter (APEX) observations. DSHs, produced when X-rays scatter off interstellar dust, encode information about both the source distance and the distribution of intervening material. Previous distance estimates for 4U 1630−47 (4.9 kpc and 11.5 kpc)...
