Accepted Cycle 24 Archive Proposals

Proposal Number Subject Category PI Name Title
24200155STARS AND WDHans GuentherStellar activity with TESS and Chandra
24200414STARS AND WDVinay KashyapGlueing CSC to Gaia to probe stellar activity evolution
24500429SN, SNR AND ISOLATED NSOleg KargaltsevA Census of Pulsar Wind Nebulae and Their Pulsars
24610226NORMAL GALAXIES: DIFFUSE EMISSIONMihoko YukitaHARD X-RAY NEBULAE IN STAR-FORMING GALAXIES
24610329NORMAL GALAXIES: DIFFUSE EMISSIONAlejandro Serrano BorlaffEXPLORING THE ORIGIN OF LENTICULAR GALAXIES WITH CHANDRA/ACIS
24620019NORMAL GALAXIES: X-RAY POPULATIONSRupali ChandarThe First Comprehensive Study of LMXBs Formed in the Globular Cluster Systems of Spiral Galaxies
24700002ACTIVE GALAXIES AND QUASARSDaniel SchwartzSearch for high redshift dual, binary, and offset AGN, using gravitational lensing for milli-arcsec X-ray astrometry.
24700214ACTIVE GALAXIES AND QUASARSNico CappellutiExploring the Early Universe with Chandra and JWST
24700368ACTIVE GALAXIES AND QUASARSWenhao LiX-ray AGN in post-merger galaxies
24700420ACTIVE GALAXIES AND QUASARSFrancesca CivanoAnalysis of z<0.7 Cool Attitude Target quasars to calibrate the Hubble diagram
24800348CLUSTERS OF GALAXIESGiulia CeriniNEW METRICS FOR PROBING THE DYNAMICAL STATE OF GALAXY CLUSTERS
Subject Category: STARS AND WD

Proposal Number: 24200155

Title: Stellar activity with TESS and Chandra

PI Name: Hans Guenther

Stellar activity is the signature of magnetic fields powered by a convective dynamo. By studying X-ray activity, we work towards understanding stellar structure and stellar evolution. Also, X-ray and FUV radiation can evaporate exoplanet atmospheres and sterilize planetary surfaces. On the other hand, it also drives a rich photochemistry, possibly enabling the building blocks of life. In this proposal, we request funding to study, as a homogeneous set, a number of Chandra Cool Attitude Target (CAT) observations taken in the Stellar activity with TESS and Chandra program.

 Subject Category: STARS AND WD

Proposal Number: 24200414

Title: Glueing CSC to Gaia to probe stellar activity evolution

PI Name: Vinay Kashyap

X-ray stellar surveys show there are problems in our understanding of the evolution of stellar magnetic activity and star formation history in our neighbourhood. Matching sources from the Chandra Source Catalog (CSC) with Gaia will provide a major improvement in our understanding by allowing comparisons with predictions from state-of-the-art models of stellar activity. We will build the first detailed picture of the evolution of magnetic dynamos and coronal heating for stars with ages 1-10 Gyr, probe the disk star formation history, and test conclusions of population surveys that find an excess of young yellow stars. We will use ML methods to remove ambiguity in multiple matches. Our work will add value to the CSC by building one of the cleanest stellar matched samples possible.

 Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 24500429

Title: A Census of Pulsar Wind Nebulae and Their Pulsars

PI Name: Oleg Kargaltsev

The CXO's sub-arcsecond resolution and low background makes it uniquely suited for PWN studies. In fact, ~80% of PWNe were discovered in X-rays with CXO. Earlier populations studies of PWNe revealed some intriguing trends and correlations, but there has not been a comprehensive PWN census since 2012 although many new PWNe have been found. In the past decade Fermi LAT has discovered and characterized the properties of many gamma-ray pulsars associated with the CXO-resolved PWNe. Evidence is emerging that the PWN morphological and spectral properties are linked to the pulsar's magnetospheric geometry, which also shapes the GeV pulse profiles and spectra. We propose to study this connection while performing an overdue census of PWNe and pulsars observed with CXO.

 Subject Category: NORMAL GALAXIES: DIFFUSE EMISSION

Proposal Number: 24610226

Title: HARD X-RAY NEBULAE IN STAR-FORMING GALAXIES

PI Name: Mihoko Yukita

Superheated gas is thought to drive galactic outflows from regions of intense star formation, and this gas has been detected in the nuclei of several starburst galaxies. However, a major unsolved problem is how (or whether) this gas connects to the kpc-scale winds seen from radio through the X-rays. Recently, diffuse, hard X-ray, kpc-scale nebulae have been reported in several galaxies, and they may provide the missing link between the nucleus and the larger wind. We propose an archival survey to quantify the frequency and properties of diffuse, hard emission in star-forming galaxies, search for superheated nuclear gas via Fe XXV emission, and construct thermodynamic maps of the soft X-ray nebulae to connect them to the harder emission.

 Subject Category: NORMAL GALAXIES: DIFFUSE EMISSION

Proposal Number: 24610329

Title: EXPLORING THE ORIGIN OF LENTICULAR GALAXIES WITH CHANDRA/ACIS

PI Name: Alejandro Serrano Borlaff

Recent studies suggest that low stellar-mass S0 galaxies are formed via secular processes, while massive S0 are preferentially formed through galactic mergers. This hypothesis can be contrasted based on the diffuse X-ray emission from hot gas halos. Due to the long timescales required to cool the hot gas phase, extended soft-band X-ray emission will be preferentially associated with galaxies that formed through mergers rather than those that evolved passively. The key focus of this archive proposal is a systematic search of extended hot gas halos on disk galaxies using ACIS observations of the Chandra Catalog of Nearby Galaxies. We will test the differences of this emission (or their absence) as a function of the morphological type (S0s vs. spirals), stellar mass, and environment density.

 Subject Category: NORMAL GALAXIES: X-RAY POPULATIONS

Proposal Number: 24620019

Title: The First Comprehensive Study of LMXBs Formed in the Globular Cluster Systems of Spiral Galaxies

PI Name: Rupali Chandar

Low mass X-ray binaries (LMXBs) are produced extremely efficiently in the ancient globular cluster (GC) systems of elliptical galaxies. A near-constant 4-6.5% of elliptical GCs host bright LMXBS, with a strong preference for massive, dense, metal-rich GCs. By contrast, we still know very little about LMXB production in the GCs of spirals, because few GC catalogs exist in these complex, star-forming galaxies. New reliable, HST-based GC catalogs have recently become available in 18 spirals which also have deep, archival Chandra observations. These will be used in one of the first explorations of how efficiently GCs in spiral galaxies produce LMXBs; the results for spiral will be compared with those established for elliptical galaxies over the past 20 years.

 Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 24700002

Title: Search for high redshift dual, binary, and offset AGN, using gravitational lensing for milli-arcsec X-ray astrometry.

PI Name: Daniel Schwartz

We propose to use rich archival Chandra observations of eight highly magnified lensed quasars to elucidate the location of the X-ray emission relative to the radio and optical origins. This is a pioneering project, which can enable us to use Chandra observations in a novel way that can provide an unprecedented X-ray astrometric accuracy of a milliarcsecond, <10 pc for sources at cosmological distances. The technique can improve X-ray astrometry and resolution by even 3 orders of magnitude, which in turn will allow us to probe the inner regions of selected quasars for dual, binary, or offset active galactic nuclei (AGN). These sources were originally observed with very different objectives, and the analysis we propose has never been applied.

 Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 24700214

Title: Exploring the Early Universe with Chandra and JWST

PI Name: Nico Cappelluti

With this proposal we aim to study z>5 X-ray sources using data from the Cycle 1 JWST COSMOS-Webb treasury program and the ERS program JWST-TDF in the NEP field in conjunction with Deep Chandra archival data to probe the early Universe by means of stacking analysis. Our goal is to determine a) the abundance of AGN-like X-ray sources at z>5 in order to shed new light on early SMBH growth; b) constrain the high-z Star Formation Rate (SFR)-L_X efficiency by deriving Chandra X-ray luminosities and SFRs obtained by JWST and c) compute the space density and X-ray throughput of early AGN candidates and compare them with predictions of SMBH seeding models.

 Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 24700368

Title: X-ray AGN in post-merger galaxies

PI Name: Wenhao Li

Post mergers are disturbed, coalesced mergers with shells and tidal tails, which are expected to host AGN. We have confirmed a high X-ray AGN fraction of 62% in 79 high-mass (10.510. Here we propose to extend our analysis to 33 post mergers and 604 control galaxies in the Chandra archive with 9
 Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 24700420

Title: Analysis of z<0.7 Cool Attitude Target quasars to calibrate the Hubble diagram

PI Name: Francesca Civano

A new method has been proposed by Risaliti & Lusso (2016, 2019), taking advantage of the large statistics provided by quasar surveys, to constrain cosmological models with quasars in a completely unexplored redshift range beyond which SN Ia are hardly detected. We want to exploit the sample of z<0.7 quasars with pointed X-ray observations that were recently observed as Chandra Cool Targets (CCTs) plus archival sources drawn from the same CCT sample (48 sources total). The goal is to analyze their X-ray properties and improve the calibration of this new method for cosmological purposes at z<0.7 where samples are scarce. We request fundings to support the analysis of this sample and develop tools to automatically analyze future CCTs observations.

 Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 24800348

Title: NEW METRICS FOR PROBING THE DYNAMICAL STATE OF GALAXY CLUSTERS

PI Name: Giulia Cerini

We propose a new metric to study the cross-correlation of fluctuations between non-baryonic dark matter and hot gas in a sample of galaxy clusters. Clusters are assumed to be in hydrostatic equilibrium with gas and member galaxies tracing the underlying gravitational potential. Studies of merging clusters reveals that these assumptions are suspect. Using empirically derived HST lensing mass maps in combination with X-ray images from archival Chandra data of a sample of galaxy clusters that span a wide range of masses, redshifts and differing dynamical states, we will spatially resolve mass and gas fluctuations and study their coherence. Fluctuation analysis of the lensing and X-ray surface brightness maps will permit evaluating how well the gas traces the underlying dark matter potential.