Adam Ginsburg's blog

Articles in the publications category

Publications from 2016

2017/01/01

I haven't updated the 'publications' subdirectory for a long time, mostly because I forgot it existed. I'd like to go through these and update them with highlight figures etc, but there's no guarantee I'll find the time... this is really the kind of thing that should be done as the papers are submitted. But that checklist has been getting very long lately.

Immer2016a

Temperature structures in Galactic center clouds. Direct evidence for gas heating via turbulence
K. Immer and J. Kauffmann and T. Pillai and A. Ginsburg and K. M. Menten
\aap 595 A94 (2016)

Galametz2016a

Water, methanol and dense gas tracers in the local ULIRG Arp 220: results from the new SEPIA Band 5 Science Verification campaign
M. Galametz and Z.-Y. Zhang and K. Immer and E. Humphreys and R. Aladro and C. De Breuck and A. Ginsburg and S. C. Madden and P. Møller and V. Arumugam
\mnras 462 L36-L40 (2016)

Ginsburg2016b

Toward gas exhaustion in the W51 high-mass protoclusters
A. Ginsburg and W. M. Goss and C. Goddi and R. Galván-Madrid and J. E. Dale and J. Bally and C. D. Battersby and A. Youngblood and R. Sankrit and R. Smith and J. Darling and J. M. D. Kruijssen and H. B. Liu
\aap 595 A27 (2016)

Battersby2016a

A Brief Update on the CMZoom Survey
C. Battersby and E. Keto and Q. Zhang and S. Longmore and J. M. D. Kruijssen and T. Pillai and J. Kauffmann and D. Walker and X. Lu and A. Ginsburg and J. Bally and E. C. Mills and J. Henshaw and K. Immer and N. Patel and V. Tolls and A. Walsh and K. Johnston and L. Ho
(2016)

Lin2016a

Cloud Structure of Galactic OB Cluster-forming Regions from Combining Ground- and Space-based Bolometric Observations
Y. Lin and H. B. Liu and D. Li and Z.-Y. Zhang and A. Ginsburg and J. E. Pineda and L. Qian and R. Galván-Madrid and A. F. McLeod and E. Rosolowsky and J. E. Dale and K. Immer and E. Koch and S. Longmore and D. Walker and L. Testi
\apj 828 32 (2016)

Eisner2016a

Protoplanetary Disks in the Orion OMC1 Region Imaged with ALMA
J. A. Eisner and J. M. Bally and A. Ginsburg and P. D. Sheehan
\apj 826 16 (2016)

McLeod2016b

Connecting the dots: a correlation between ionising radiation and cloud mass-loss rate traced by optical integral field spectroscopy
A. F. McLeod and M. Gritschneder and J. E. Dale and A. Ginsburg and P. D. Klaassen and J. C. Mottram and T. Preibisch and S. Ramsay and M. Reiter and L. Testi
ArXiv e-prints (2016)

Youngblood2016b

The Orion Fingers: Near-IR Spectral Imaging of an Explosive Outflow
A. Youngblood and A. Ginsburg and J. Bally
\aj 151 173 (2016)

Svoboda2016a

The Bolocam Galactic Plane Survey. XIV. Physical Properties of Massive Starless and Star-forming Clumps
B. E. Svoboda and Y. L. Shirley and C. Battersby and E. W. Rosolowsky and A. G. Ginsburg and T. P. Ellsworth-Bowers and M. R. Pestalozzi and M. K. Dunham and N. J. Evans, II and J. Bally and J. Glenn
\apj 822 59 (2016)

Henshaw2016a

Molecular gas kinematics within the central 250 pc of the Milky Way
J. D. Henshaw and S. N. Longmore and J. M. D. Kruijssen and B. Davies and J. Bally and A. Barnes and C. Battersby and M. Burton and M. R. Cunningham and J. E. Dale and A. Ginsburg and K. Immer and P. A. Jones and S. Kendrew and E. A. C. Mills and S. Molinari and T. J. T. Moore and J. Ott and T. Pillai and J. Rathborne and P. Schilke and A. Schmiedeke and L. Testi and D. Walker and A. Walsh and Q. Zhang
\mnras 457 2675-2702 (2016)

Robitaille2016a

Python in Astronomy 2016 Unproceedings
T. Robitaille and K. Cruz and P. Greenfield and E. Jeschke and M. Juric and S. Mumford and C. Prescod-Weinstein and M. Sosey and E. Tollerud and J. VanderPlas and J. Ford and D. Foreman-Mackey and T. Jenness and T. Aldcroft and M. Alexandersen and M. Bannister and K. Barbary and G. Barentsen and S. Bennett and M. Boquien and J. I. Campos Rozo and S. Christe and L. Corrales and M. Craig and C. Deil and N. Dencheva and A. Donath and S. Douglas and L. Ferreira and A. Ginsburg and N. Goldbaum and K. Gordon and A. Hearin and C. Hummels and D. Huppenkothen and E. Jennings and J. King and S. Lawler and A. Leonard and P. L. Lim and L. McBride and B. Morris and C. Nunez and R. Owen and J. Parejko and E. Patel and A. Price-Whelan and R. Ruggiero and B. Sipocz and A. Stevens and J. Turner and S. Tuttle and P. Yanchulova Merica-Jones and P. Yoachim
35 (2016)

McLeod2016a

A nebular analysis of the central Orion nebula with MUSE
A. F. Mc Leod and P. M. Weilbacher and A. Ginsburg and J. E. Dale and S. Ramsay and L. Testi
\mnras 455 4057-4086 (2016)

Ginsburg2016a

Dense gas in the Galactic central molecular zone is warm and heated by turbulence
A. Ginsburg and C. Henkel and Y. Ao and D. Riquelme and J. Kauffmann and T. Pillai and E. A. C. Mills and M. A. Requena-Torres and K. Immer and L. Testi and J. Ott and J. Bally and C. Battersby and J. Darling and S. Aalto and T. Stanke and S. Kendrew and J. M. D. Kruijssen and S. Longmore and J. Dale and R. Guesten and K. M. Menten
\aap 586 A50 (2016)

Ginsburg2016

CAMELOT: the Cloud Archive for MEtadata, Library & Online Toolkit
A. Ginsburg and J. M. D. Kruijssen and S. Longmore and E. Koch and S. Glover and J. Dale and B. Commercon and A. Giannetti and A. Mcleod and L. Testi and S. Zahorecz and J. Rathborne and Q. Zhang and F. Fontani and M. Beltran and V. Rivilla
(2016)

Goddi2016a

Hot ammonia around young O-type stars. III. High-mass star formation and hot core activity in W51~Main
C. Goddi and A. Ginsburg and Q. Zhang
(2016)

Longmore2016a

Using young massive star clusters to understand star formation and feedback in high-redshift-like environments
S. Longmore and A. Barnes and C. Battersby and J. Bally and J. M. D. Kruijssen and J. Dale and J. Henshaw and D. Walker and J. Rathborne and L. Testi and J. Ott and A. Ginsburg
(2016)

Publications from 2014

2016/01/01

Summary of publications from 2014 (just c&p'd from my bibdesk):

Bally2014b

Outflows, Dusty Cores, and a Burst of Star Formation in the North America and Pelican Nebulae
J. Bally and A. Ginsburg and R. Probst and B. Reipurth and Y. L. Shirley and G. S. Stringfellow
\aj 148 120 (2014)

Bally2014a

Absorption Filaments toward the Massive Clump G0.253+0.016
J. Bally and J. M. Rathborne and S. N. Longmore and J. M. Jackson and J. F. Alves and E. Bressert and Y. Contreras and J. B. Foster and G. Garay and A. Ginsburg and K. G. Johnston and J. M. D. Kruijssen and L. Testi and A. J. Walsh
\apj 795 28 (2014)

Ginsburg2014a

The dense gas mass fraction in the W51 cloud and its protoclusters
A. Ginsburg and J. Bally and C. Battersby and A. Youngblood and J. Darling and E. Rosolowsky and H. Arce and M. L. Santos
(2014)

Battersby2014b

The Onset of Massive Star Formation: The Evolution of Temperature and Density Structure in an Infrared Dark Cloud
C. Battersby and A. Ginsburg and J. Bally and S. Longmore and M. Dunham and J. Darling
\apj 787 113 (2014)

Battersby2014a

The Comparison of Physical Properties Derived from Gas and Dust in a Massive Star-forming Region
C. Battersby and J. Bally and M. Dunham and A. Ginsburg and S. Longmore and J. Darling
\apj 786 116 (2014)

Publications from 2015

2016/01/01

Summary of publications from 2015 (just c&p'd from my bibdesk):

Ginsburg2015b

High-mass star-forming cloud G0.38+0.04 in the Galactic center dust ridge contains H$_2$CO and SiO masers
A. Ginsburg and A. Walsh and C. Henkel and P. A. Jones and M. Cunningham and J. Kauffmann and T. Pillai and E. A. C. Mills and J. Ott and J. M. D. Kruijssen and K. M. Menten and C. Battersby and J. Rathborne and Y. Contreras and S. Longmore and D. Walker and J. Dawson and J. A. P. Lopez
\aap 584 L7 (2015)

Colombo2015a

Graph-based interpretation of the molecular interstellar medium segmentation
D. Colombo and E. Rosolowsky and A. Ginsburg and A. Duarte-Cabral and A. Hughes
\mnras 454 2067-2091 (2015)

Weilbacher2015a

A MUSE map of the central Orion Nebula (M 42)
P. M. Weilbacher and A. Monreal-Ibero and W. Kollatschny and A. Ginsburg and A. F. McLeod and S. Kamann and C. Sandin and R. Palsa and L. Wisotzki and R. Bacon and F. Selman and J. Brinchmann and J. Caruana and A. Kelz and T. Martinsson and A. Pécontal-Rousset and J. Richard and M. Wendt
\aap 582 A114 (2015)

Isella2015a

Next Generation Very Large Array Memo No. 6, Science Working Group 1: The Cradle of Life
A. Isella and C. H. Hull and A. Moullet and R. Galván-Madrid and D. Johnstone and L. Ricci and J. Tobin and L. Testi and M. Beltran and J. Lazio and A. Siemion and H. Liu and F. Du and K. Öberg and T. Bergin and P. Caselli and T. Bourke and C. Carilli and L. Perez and B. Butler and I. Pater and C. Qi and M. Hofstadter and R. Moreno and D. Alexander and J. Williams and P. Goldsmith and M. Wyatt and L. Loinard and J. Francesco and D. Wilner and P. Schilke and A. Ginsburg and Á. Sánchez-Monge and Q. Zhang and H. Beuther
(2015)

Colombo2015b

The road toward a full, high resolution Molecular Cloud catalog of the Galaxy
D. Colombo and E. Rosolowsky and A. Ginsburg and A. Duarte-Cabral and A. Hughes
(2015)

Ginsburg2015c

Detecting Stars at the Galactic Centre via Synchrotron Emission
I. Ginsburg and X. Wang and A. Loeb and O. Cohen
ArXiv e-prints (2015)

Wang2015a

Large-scale filaments associated with Milky Way spiral arms
K. Wang and L. Testi and A. Ginsburg and C. M. Walmsley and S. Molinari and E. Schisano
\mnras 450 4043-4049 (2015)

Bally2015a

The Orion fingers: Near-IR adaptive optics imaging of an explosive protostellar outflow
J. Bally and A. Ginsburg and D. Silvia and A. Youngblood
\aap 579 A130 (2015)

McLeod2015a

The Pillars of Creation revisited with MUSE: gas kinematics and high-mass stellar feedback traced by optical spectroscopy
A. F. McLeod and J. E. Dale and A. Ginsburg and B. Ercolano and M. Gritschneder and S. Ramsay and L. Testi
\mnras 450 1057-1076 (2015)

Ellsworth-Bowers2015a

The Bolocam Galactic Plane Survey. XIII. Physical Properties and Mass Functions of Dense Molecular Cloud Structures
T. P. Ellsworth-Bowers and J. Glenn and A. Riley and E. Rosolowsky and A. Ginsburg and N. J. Evans, II and J. Bally and C. Battersby and Y. L. Shirley and M. Merello
\apj 805 157 (2015)

Merello2015a

The Bolocam Galactic Plane Survey. XI. Temperatures and Substructure of Galactic Clumps Based On 350 $\mu$M Observations
M. Merello and N. J. Evans, II and Y. L. Shirley and E. Rosolowsky and A. Ginsburg and J. Bally and C. Battersby and M. M. Dunham
\apjs 218 1 (2015)

Thompson2015c

The ionised,radical and molecular Milky Way: spectroscopic surveys with the SKA
M. Thompson and H. Beuther and C. Dickinson and J. Mottram and P. Klaassen and A. Ginsburg and S. Longmore and A. Remijan and K. M. Menten
Advancing Astrophysics with the Square Kilometre Array (AASKA14) 126 (2015)

Ellsworth-Bowers2015b

The Bolocam Galactic Plane Survey. XII. Distance Catalog Expansion Using Kinematic Isolation of Dense Molecular Cloud Structures with $^13$CO(1-0)
T. P. Ellsworth-Bowers and E. Rosolowsky and J. Glenn and A. Ginsburg and N. J. Evans, II and C. Battersby and Y. L. Shirley and B. Svoboda
\apj 799 29 (2015)

Ginsburg2015a

The dense gas mass fraction in the W51 cloud and its protoclusters
A. Ginsburg and J. Bally and C. Battersby and A. Youngblood and J. Darling and E. Rosolowsky and H. Arce and M. E. Lebrón Santos
\aap 573 A106 (2015)

The Peculiar Balmer Decrement of SN 2009ip: Constraints on Circumstellar Geometry

2012/11/21
Emily M. Levesque, Guy S. Stringfellow, Adam G. Ginsburg, John Bally, Brian A. Keeney

SN2009ip is a particularly interesting "supernova" since it left a bright remnant behind, indicating that it was instead a supernova impostor. The 2012B event, a brightening in late September 2012, looked like it might be a "genuine supernova", but maybe not. Have a look at the other papers on this object: http://arxiv.org/abs/1210.3568, http://arxiv.org/abs/1210.3347, http://arxiv.org/abs/1209.6320. A few folks at CU, primarily Guy, had acquired some spectra of SN2009ip right around the 2012B event. We had a quick look at the data and decided there was something really interesting in it that other groups (who probably had more complete data) had overlooked. The most interesting single point we noted was a peculiar "Balmer Decrement" (which is the ratio of H-alpha to H-beta). The normal Balmer decrement is ~3 (2.87 at n~10³ and 10000K), but we observed a decrement of ~1.4 (and so did others, see e.g. http://users.northnet.com.au/~bohlsen/Nova/sn2009ip.htm). This Balmer decrement is weird, because all normal effects will increase rather than decrease the Balmer decrement.
- Interstellar reddening - affects the blue more than the red, therefore should decrease H-beta relative to H-alpha. Of course, the reddening towards SN2009ip has been measured to be quite low.
- Line Splitting due to optical depth in the H-beta line (photons become "trapped" in the n=4 state and "escape" via Paschen-alpha and H-alpha) - but this only serves to decrease H-beta and increase H-alpha. This is known as "Case C recombination" (see Xu et al 1992, Figure 1)
So what can increase the Balmer decrement? Two possibilities:
1. Hydrogen reaches local densities above 10¹³ cm^-3: above these densities, it reaches collisional equilibrium with the gas and adopts the gas temperature. At 10000K, H-beta will be a few times brighter than H-alpha [to-do: put exactly how much brighter...]
2. H-alpha becomes optically thick, while H-beta remains optically thin. This is essentially a geometric argument, and is explored a little in the text. If H-alpha becomes optically thick, more hydrogen won't increase the H-alpha brightness, but if H-beta remains optically thin, more hydrogen will increase its brightness. Simple argument, and it hasn't been fully explored yet (does the radiative transfer work, or does the "Case-C" situation kick in too hard first?), but it is a plausible alternative.
If you want to see my calculations in action, check out the ipython notebook performing the calculations. In case you're interested in Case C recombination, here's a first step: a hydrogen level diagram with levels connected by the (sum of the) Einstein A values between the relevant levels (from http://physics.nist.gov/cgi-bin/ASD/lines1.pl, generated with https://github.com/keflavich/energyleveldiagrams).

Galactic H2CO Densitometry I: Pilot survey of Ultracompact HII regions and methodology

2012/11/21

First Author [ ADS ] [ Full Version ]

We examined 24 UCHII regions using the GBT to observe the 2-2 line of ortho-Formaldehyde. We measured the local gas density and compared to GMCs and other galaxies. We found densities in GMCs that are 1-2 orders of magnitude higher than the mean density in GMCs, implying that extreme overdensities are common even in "quiescent" (non-star-forming) GMCs. This work was almost entirely my own, but was seeded by Jeremy Darling Some highlight figures from the paper:

A sample spectrum. On the top, black is Formaldehyde 1-1, red is Formaldehyde 2-2. On the bottom, blue is 13CO, red is H77α, black is H110α.

Histograms of GMC mean densities and the densities measured directly from our survey. Note that even for "serendipitious" line of sight GMCs, the densities are MUCH higher than typical GMC densities.

Comparison of the measured column densities of formaldehyde and inferred number densities of H₂.

Characterizing Precursors to Stellar Clusters with Herschel

2012/09/20

[ ADS ] [ arXiv ]

C. Battersby, J. Bally, A. Ginsburg, J.-P. Bernard, C. Brunt, G.A. Fuller, P. Martin, S. Molinari, J. Mottram, N. Peretto, L. Testi, M.A. Thompson 2011

The paper includes a careful characterization of the properties of both dense and diffuse regions within the two Hi-Gal Science Demonstration Phase fields (l=30 and l=59). It demonstrated that star formation tracers are more common at higher temperatures, and that IRDCs exist on both the near and far side of the galaxy, where the difference between near and far is around 5-7 kpc.

I helped develop the iterative background subtraction method and contributed to the discussion and conclusions; most of the work was Cara's but my experience with iterative flux estimation from the BGPS pipeline proved useful.

The optically bright post-AGB population of the LMC

2012/09/20

[ADS ] [arXiv ]

E. van Aarle, H. Van Winckel, T. Lloyd Evans, T. Ueta, P. R. Wood, and A. G. Ginsburg

A catalog of post-AGB stars in the LMC, useful in particular because they are at a common distance. Post-AGB stars are quite luminous (> 1000 L_O usually), so easily detected in the LMC.

My contribution to this work was years ago; I worked on the SAGE project for a few months at the University of Denver with Toshiya Ueta. I generated a catalog of post-AGB objects and an online catalog with automatic SED plotter. It was a pretty neat project, but I left before I was able to convince others that my catalog was definitive; nonetheless it was eventually used in this publication. As an aside, that was my first foray into data languages, and I ended up using the Perl Data Language long before I learned of python and before I got a free IDL license.

Star-forming Region Sh 2-233IR. I. Deep Near-infrared Observations toward the Embedded Stellar Clusters

2011/07/18

[ ADS ] [ arXiv ]

My contributions to this paper were minor. Analysis of luminosity functions in the IRAS 05358+3543 region have identified different aged groups. The paper contributes to the picture of sequential (triggered?) star formation in the S233-235 region in Auriga.

Outflows and Massive Stars in the protocluster IRAS 05358+3543

2011/07/11

First Author [ ADS ] [ arXiv ]

A mm and near-IR study of the IRAS 05358+3543 system. Recently (2011), it has become clear that "protocluster" is unlikely to be the right label for IRAS 05358+3543. "proto-association" might be more accurate. Perhaps the most interesting result of this paper is the discovery that the central source is likely to be a 400-AU binary with two massive (>8 msun) stars at different evolutionary stages. It is just barely in ALMA's range...

An Infrared Through Radio Study of the Properties and Evolution of IRDC Clumps

2011/07/11

ADS arXiv I assisted in many of the technical aspects of the paper including Bolocam and VLA data reduction. We identify a potential evolutionary sequence among millimeter "clumps". HCO+ and N2H+ maps are used to measure the physical properties of some of these clumps.

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