meeting 2025 09 15 n57 - JacobPilawa/TriaxSchwarzschild_wiki_6 GitHub Wiki

• Tried to do coordinate based searches for MRK1216/N6086/A1836 in the Crook+07 HDC and LDC catalogs. All 3 objects' coordinates return "No object found around (ICRS) position" from the Crook catalogs.

• I also found this work which looks at black hole scaling relations for different environments, making specific reference to both N6086 and A1836BCG!

  • They state "The 2MRS group catalogue is complete only to cz < 10 000 km s−1, which leaves three galaxies beyond the limits of the catalogue (NGC 6086, NGC 6264 and the BCG of Abell 1836). For the sake of consistency, we remove these galaxies from consideration in this section only. 20 galaxies of the remaining sample of 66 galaxies are not linked to groups in the Crook et al. (2007) catalogue. For these galaxies, we will assume that their halo masses are below the limits of detection, and are thus in low-mass haloes. These galaxies will all be in the lower 50 per cent samples of group mass." This explains why they're not in the Crook catalog.
  • Mrk1216, on the other hand, is likely not in the catalog due to its isolation; e.g., here and here saying that Mrk1216 is an extremely isolated galaxy (and around ~100 Mpc away), so likely impacted by magnitude limits/wouldn't appear in a group given how isolated it is.

• For my own reference, here's a nice page that let's you search through 2MRS+ catalog here

• This is now reflected in the Overleaf!

I've been combing through the papers I found below and pulling out relevant information into an Excel sheet here.

I'm currently at around ~60 galaxies that I have found new measurements for. I've been prioritizing CO and stellar measurements, but a few more exotic methods have slipped through the cracks. I've also started only by taking down the methods and black hole masses just so I can get a list of sources first, and then can follow up later for more detailed information.

Note that the Excel spreadsheet is currently only listing sources from individual papers (e.g., I haven't checked for new measurements from the compilation papers below), but I will move on to that after I feel relatively complete for the individual sources.

I'm going to look into methods of tagging papers as they're posted which might be relevant to allow for easier data collection in the future. Not sure how exactly to do that yet (e.g., Benty Fields or some other similar service?) but will circle back on this!

AI Attempts:

• I tried for quite a while to use Gemini/Claude/ChatGPT for some of the literature review and found it to be (at least how I was using it) quite unreliable. Here are a few sample chats I had with the models:
• Gemini: here. I found Gemini to be the most promising at first, but on closer inspection, the results are full of hallucinations. Many of the galaxies that it claims had BH measurements either didn't have a measurement at all, or had a measurement of a non-BH parameter, or sometimes were just totally made up!
  • You can even see in this chat that it finds N2693, but thinks it N2695! It also makes up a non-existent DOI number for this publication (though the DOI is close).
• ChatGPT here. Abandoned ChatGPT quite quickly. I was using their "deep research" feature (which I gathered is the recommendation for this type of problem), and the LLM had quite a hard time finding "niche" sources. Additionally, it refused to give me more than ~10 sources or so each chat, despite taking quite awhile and claiming to have seen many dozens of links

We wanted to start somewhat formally collecting supermassive black hole mass measurements. I basically have been doing ADS searches for "dynamical black hole mass measurements" or some variation of that search, and have assumed that the Remco+16 "Unification..." paper is complete, and filling in the black hole measurements since then.

Notes about my search:

• Likely missed some of the reverberation/non-stellar/non-CO based dynamical mass measurements just from the nature of my search. There are definitely a few papers I have found, but I paid most attention to stellar or gas based measurements.

Useful larger references:

• Remco+16 "Unification..." paper
• Davis+17 compilation of 44 spiral galaxy Mbh's: paper
• Zhang+19 compilation of Mbh/spin measurements via X-ray reflection spectroscopy: paper
• Sahu+19: compilation of 84 early-type galaxies (42 of which are "new"): paper
• Baldassare+20: Eight new low mass points on M-sigma with virial masses: paper
• Mejia-Restrepo+22: 689 broad line region Mbh estimates: paper
• Sahu+22: Appears to be a follow up/set of updates to the Sahu+19 paper. This source contains ~104 objects: paper
• Winkel+25: Compilationof CARAMEL/GRAVITY/cRM masses for AGN: paper
• Farrah+23b: Compilation of low redshift ETG MBHs: paper
  • Slight addition to this work here: paper

• N3706 is Remco's paper is 1 dex too large. Should be log10(Mbh)~8.77 instead of 9.77; likely just a typo.
• N997's mass is quoted in a strange way, and is thus incorrect in the Big Galaxies + Big Black Holes paper; two galaxies are reported in the original work, one reported in units of 1e8 solar masses; the other reported in log10(Mbh) units, leading to this incorrect Mbh measurement.