Explanipedia

RADIAL TRENDS IN IMF-SENSITIVE ABSORPTION FEATURES IN TWO EARLY-TYPE GALAXIES: EVIDENCE FOR ABUNDANCE-DRIVEN GRADIENTS Open

Nicholas J. McConnell, Jessica R. Lu, Andrew W. Mann · 2023

Samples of early-type galaxies show a correlation between stellar velocity dispersion and the stellar initial mass function (IMF) as inferred from gravity-sensitive absorption lines in the galaxies' central regions. To search for spatial v…

A note on the involutive invariants of certain pretzel knots Open

Kristen Hendricks, Matthew Issac, Nicholas J. McConnell · 2021

We compute the involutive knot invariants for pretzel knots of the form P(-2,m,n) for m and n odd and greater than or equal to 3.

Inclusion in an international training program for early-career engineers and scientists in the Thirty Meter Telescope partnership Open

Nicholas J. McConnell, Austin Barnes, Warren Skidmore, Renate Kupke, Jessica R. Lu , et al. · 2020

The TMT Early-Career Initiative (TECI) is an innovative, evolving program designed to support inclusion in the Thirty Meter Telescope (TMT) International Observatory (TIO) by engaging graduate students and postdocs in TIO projects, and pre…

The MASSIVE Survey XIII. Spatially Resolved Stellar Kinematics in the Central 1 kpc of 20 Massive Elliptical Galaxies with the GMOS-North Integral Field Spectrograph Open

Irina Ene, Chung‐Pei Ma, Nicholas J. McConnell, Jonelle L. Walsh, Philipp Kempski , et al. · 2019

We use observations from the GEMINI-N/GMOS integral field spectrograph (IFS) to obtain spatially resolved stellar kinematics of the central ∼1 kpc of 20 early-type galaxies (ETGs) with stellar masses greater than 10 11.7 M ⊙ in the MASSIVE…

Long optical plateau in the afterglow of the short GRB 150424A with extended emission - Evidence for energy injection by a magnetar? Open

F. Knust, J. Greiner, Hendrik van Eerten, P. Schady, Д. А. Канн , et al. · 2017

Short-duration gamma-ray bursts (GRBs) with extended emission form a subclass of short GRBs, comprising about 15% of the short-duration sample. Afterglow detections of short GRBs are also rare (about 30%) because of their lower luminosity.…

Long optical plateau in the afterglow of the short GRB 150424A with extended emission Open

F. Knust, J. Greiner, Hendrik van Eerten, P. Schady, Д. А. Канн , et al. · 2017

\n Context. Short-duration gamma-ray bursts (GRBs) with extended emission form a subclass of short GRBs, comprising about 15% of the short-duration sample. Afterglow detections of short GRBs are also rare (about 30%) because of their lower…

A long optical plateau in the afterglow of the Extended Emission short GRB 150424A: Evidence for energy injection by a magnetar? Open

F. Knust, J. Greiner, Hendrik van Eerten, P. Schady, Д. А. Канн , et al. · 2017

Short-duration GRBs with extended emission form a subclass of short GRBs, comprising about 15% of the short-duration sample. Afterglow detections of short GRBs are also rare (about 30%) due to their smaller luminosity. We present a multi-b…

The MASSIVE Survey – VII. The relationship of angular momentum, stellar mass and environment of early-type galaxies Open

Melanie Veale, Chung‐Pei Ma, Jenny E. Greene, Jens Thomas, John P. Blakeslee , et al. · 2017

We analyse the environmental properties of 370 local early-type galaxies\n(ETGs) in the MASSIVE and ATLAS3D surveys, two complementary volume-limited\nintegral-field spectroscopic (IFS) galaxy surveys spanning absolute $K$-band\nmagnitude …

The MASSIVE Survey – V. Spatially resolved stellar angular momentum, velocity dispersion, and higher moments of the 41 most massive local early-type galaxies Open

Melanie Veale, Chung‐Pei Ma, Jens Thomas, Jenny E. Greene, Nicholas J. McConnell , et al. · 2016

We present spatially-resolved two-dimensional stellar kinematics for the 41\nmost massive early-type galaxies (MK <~ -25.7 mag, stellar mass M* >~ 10^11.8\nMsun) of the volume-limited (D < 108 Mpc) MASSIVE survey. For each galaxy, we\nobta…

THE MASSIVE SURVEY. IV. THE X-RAY HALOS OF THE MOST MASSIVE EARLY-TYPE GALAXIES IN THE NEARBY UNIVERSE Open

Andy D. Goulding, Jenny E. Greene, Chung‐Pei Ma, Melanie Veale, Ákos Bogdán , et al. · 2016

Studies of the physical properties of local elliptical galaxies are shedding new light on galaxy formation. Here we present the hot-gas properties of 33 early-type systems within the MASSIVE galaxy survey that have archival Chandra X-ray o…

A 17-billion-solar-mass black hole in a group galaxy with a diffuse core Open

Jens Thomas, Chung‐Pei Ma, Nicholas J. McConnell, Jenny E. Greene, John P. Blakeslee , et al. · 2016

The Effect of Spatial Gradients in Stellar Mass-to-Light Ratio on Black Hole Mass Measurements Open

Nicholas J. McConnell, Shi-Fan Chen, Chung‐Pei Ma, Jenny E. Greene, Tod R. Lauer , et al. · 2016

We have tested the effect of spatial gradients in stellar mass-to-light ratio (gamma) on measurements of black hole masses (M-*) derived from stellar orbit superposition models. Such models construct a static gravitational potential for a …

The MASSIVE survey – III. Molecular gas and a broken Tully–Fisher relation in the most massive early-type galaxies Open

Timothy A. Davis, Jenny E. Greene, Chung‐Pei Ma, Viraj Pandya, John P. Blakeslee , et al. · 2015

In this work we present CO(1-0) and CO(2-1) observations of a pilot sample of\n15 early-type galaxies (ETGs) drawn from the MASSIVE galaxy survey, a\nvolume-limited integral-field spectroscopic study of the most massive ETGs\n($M_* >10^{11…

Metallicity Gradients in the Halos of Elliptical Galaxies Open

Jenny E. Greene, Chung‐Pei Ma, Andrew Goulding, Nicholas J. McConnell, John P. Blakeslee , et al. · 2015

We discuss the stellar halos of massive elliptical galaxies, as revealed by our ambitious integral-field spectroscopic survey MASSIVE. We show that metallicity drops smoothly as a function of radius out to ~ 2.5 R e , while the [α/Fe] abun…

THE MASSIVE SURVEY. II. STELLAR POPULATION TRENDS OUT TO LARGE RADIUS IN MASSIVE EARLY-TYPE GALAXIES Open

Jenny E. Greene, Ryan Janish, Chung‐Pei Ma, Nicholas J. McConnell, John P. Blakeslee , et al. · 2015

We examine stellar population gradients in ~100 massive early type galaxies spanning 180 < sigma* < 370 km/s and M_K of -22.5 to -26.5 mag, observed as part of the MASSIVE survey (Ma et al. 2014). Using integral-field spectroscopy from the…

The MASSIVE Survey II: Stellar Population Trends Out to Large Radius in\n Massive Early Type Galaxies Open

Jenny E. Greene, Ryan Janish, Chung‐Pei Ma, Nicholas J. McConnell, John P. Blakeslee , et al. · 2015

We examine stellar population gradients in ~100 massive early type galaxies\nspanning 180 < sigma* < 370 km/s and M_K of -22.5 to -26.5 mag, observed as\npart of the MASSIVE survey (Ma et al. 2014). Using integral-field spectroscopy\nfrom …

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