Joint NRAO/Chandra Accepted Cycle 19 Targets and Abstracts

Proposal Number	Subject Category	PI Name	Chandra Time	Title
19700757	ACTIVE GALAXIES AND QUASARS	Tarraneh Eftekhari	50.00ks	Late-time X-ray and Radio Observations of the Unique Relativistic TDE Sw 1644+57
19400810	BH AND NS BINARIES	Arash Bahramian	5.00ks	Verifying a new candidate transitional millisecond pulsar
19700809	ACTIVE GALAXIES AND QUASARS	Andy Goulding	38.00ks	Can Radio Emission From Luminous Obscured AGN Blow Kpc-scale Ionized Outflows?
19400812	BH AND NS BINARIES	Amruta Jaodand	43.20ks	Exploring anti-correlated radio/X-ray modes in transitional millisecond pulsars

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 19700757

Title: Late-time X-ray and Radio Observations of the Unique Relativistic TDE Sw 1644+57

PI Name: Tarraneh Eftekhari

Transient accretion onto a supermassive black hole due to the tidal disruption of a star provides a unique opportunity to observe the birth and evolution of relativistic jets. The discovery of the first such event by Swift in 2011 has opened a new window into these events. Previous X-ray and radio observations have traced the evolution of the jet and helped to characterize the ambient medium surrounding a previously dormant supermassive black hole. In this Chandra proposal, we seek to track the continued dynamical evolution of the jet into the non-relativistic regime. Joint X-ray and radio observations will probe the properties of the outflow nearly 7 years later and help to constrain the density profile around the black hole to extended radii.

Subject Category: BH AND NS BINARIES

Proposal Number: 19400810

Title: Verifying a new candidate transitional millisecond pulsar

PI Name: Arash Bahramian

We propose for a 1-hour VLA observation of a newly identified tMSP candidate, which has been observed to show radio emission resembling a millisecond pulsar by the VLA in 2014, while optical and X-ray observations in 2016 suggest that it may have transitioned into an accretion state. A short VLA observation, along with a short 5-ks Chandra observation, will clearly identify whether the system has undergone a state change to an accreting state, or is likely still in a radio pulsar state.

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 19700809

Title: Can Radio Emission From Luminous Obscured AGN Blow Kpc-scale Ionized Outflows?

PI Name: Andy Goulding

We propose joint VLA radio and Chandra X-ray to observe 4 AGN selected from the SDSS-BOSS and the Hyper Suprime-Cam surveys that present spectacular extended outflowing [O III] regions, reaching up to 50kpc in diameter. Our proposed observations allow us to study the mechanical and kinematical output of the AGN through radio and X-ray observations, measure the fraction of the AGN bolometric luminosity that is transferred to the outflow, and to determine the morphology and spectral index (by producing high-res continuum maps) of the radio emission that may be co-spatial with the extended ionized AGN outflow. In turn, our study will determine what role the AGN plays in producing extended outflows, and hence, provide an in-depth understanding of the physical drivers of AGN feedback.

Subject Category: BH AND NS BINARIES

Proposal Number: 19400812

Title: Exploring anti-correlated radio/X-ray modes in transitional millisecond pulsars

PI Name: Amruta Jaodand

Recently, using coordinated VLA+Chandra observations, Bogdanov et al.(2017) have uncovered a stunning anti-correlation in the LMXB state of the tMSP PSR J1023+0038. They see that radio luminosity consistently peaks during the X-ray ‘low’ luminosity modes. Also, we have found a promising candidate tMSP, 3FGL J1544-1125(J1544) (Bogdanov and Halpern 2015; currently only tMSP candidate apart from J1023 in a persistent LMXB state). Using VLA and simultaneous Swift observations we see that it lies on the proposed tMSP track in radio vs. X-ray luminosity (L R/L X) diagram. This finding strengthens its classification as a tMSP and provides an excellent opportunity to a)determine universality of radio/X-ray brightness anti-correlatio and b)understand jet/outflow formation in tMSPs.